Conditions: Asthma
Keywords: asthma IV Magnesium
Allocation: RANDOMIZED | Intervention model: PARALLEL
Enrollment: 52
Healthy volunteers: no

Brief summary:
Many children currently being hospitalized with severe asthma could potentially avoid hospitalization and be sent home if their treatment in the emergency department was more effective. The investigators will conduct a pilot trial that will lead to a larger study to conclusively answer whether a simple and inexpensive medicine, intravenous magnesium sulfate, can be used in the emergency department to prevent hospitalization for these children.

Detailed description:
5.4.1 Acquisition The specific study agent to be used in this pilot trial is Magnesium Sulfate in Water for Injection, a sterile, nonpyrogenic solution of magnesium sulfate heptahydrate in water. Study agent will be acquired by each hospital's research pharmacy from Pfizer, Inc as a solution of magnesium sulfate in water at 80 mg/mL. Agent will be shipped directly from Pfizer to each study hospital pharmacy.

5.4.2 Preparation, Storage \& Labeling Doses for each IVMg arm will be prepared in identical manner, by drawing a specified volume of Intravenous Magnesium Sulfate (IVMg) from the commercial container using sterile technique and mixing in a polyvinylchloride container with a specified volume of sterile water. For the 50 mg/kg arm, this will be accomplished by mixing 25 mL of IVMg (80 mg/mL) with 15 mL of sterile water for a final concentration of 50 mg/mL and volume of 40 mL. For the 75 mg/kg arm, this will be accomplished by mixing 37.5 mL of IVMg (80 mg/mL) with 2.5 mL of sterile water for a final concentration of 75 mg/mL and volume of 40 mL. For the placebo arm, 40 mL of 0.9% sodium chloride solution will be drawn into a polyvinylchloride container identical in appearance to the containers used for the IVMg arms. Each prepared dose will be labeled according to the sequential randomization scheme and stored according to local pharmacy procedure. Unused doses prepared locally will be replaced after one week of storage.

5.4.3 Dosing Schedule

After randomization the institutional pharmacist will draw equivolumetric dosages (1 mL/kg, with max of 40 mL) from previously prepared vials. Enrolled subjects will be randomized to one of three arms:

* IVMg 75 mg/kg arm: 75 mg/kg (max 3 gm) infused over 20 minutes through a peripheral IV catheter
* IVMg 50 mg/kg arm: 50 mg/kg (max 2 gm) infused over 20 minutes through a peripheral IV catheter
* Placebo arm: 1 mL/kg (max 40 ml) of normal saline over 20 minutes through a peripheral IV catheter 5.4.4 Dose Modification for Potential Toxicity Clinicians will not administer IVMg to enrolled subjects outside of the study protocol until study outcomes have been determined 2 hours after the start of the infusion. The half-life of IVMg is approximately 2 hours.49 Repeated-dose protocols in an ICU setting that gave as much as 125 mg/kg IVMg to children with asthma over two hours produced no hypotension or other serious adverse effects.47 Because of this margin of safety, open-label IVMg 50 mg/kg can be administered safely 2 hours after the study infusion under strict study monitoring protocols without need for unblinding.

Arms:
arm 1: Doses for each IVMg arm will be prepared in identical manner, by drawing a specified volume of IVMg from the commercial container using sterile technique and mixing in a polyvinylchloride container with a specified volume of sterile water. For the 75 mg/kg arm, this will be accomplished by mixing 37.5 mL of IVMg (80 mg/mL) with 2.5 mL of sterile water for a final concentration of 75 mg/mL and volume of 40 mL. After randomization the institutional pharmacist will draw dosages (1 mL/kg, with max of 40 mL) from previously prepared vials. The dose will be delivered by the clinical nurse over 20 minutes through a peripheral IV. arm 2: Doses for each IVMg arm will be prepared in identical manner, by drawing a specified volume of IVMg from the commercial container using sterile technique and mixing in a polyvinylchloride container with a specified volume of sterile water. For the 50 mg/kg arm, this will be accomplished by mixing 25 mL of IVMg (80 mg/mL) with 15 mL of sterile water for a final concentration of 50 mg/mL and volume of 40 mL. After randomization the institutional pharmacist will draw dosages (1 mL/kg, with max of 40 mL) from previously prepared vials. The dose will be delivered by the clinical nurse over 20 minutes through a peripheral IV. arm 3: For the placebo arm, 40 mL of 0.9% sodium chloride solution will be drawn into a polyvinylchloride container identical in appearance to the containers used for the IVMg arms. After randomization the institutional pharmacist will draw dosages (1 mL/kg, with max of 40 mL) from previously prepared vials. The dose will be delivered by the clinical nurse over 20 minutes through a peripheral IV.

Interventions: intervention 1: Magnesium Sulfate, Heptahydrate intervention 2: 0.9% saline
Intervention descriptions: intervention 1: A single dose of intravenous magnesium sulfate given over 20 minutes through a peripheral intravenous line. Two arms of the study will deliver intravenous magnesium, one at a dose of 50 mg/kg, and the other at a dose of 75 mg/kg. intervention 2: A single dose of intravenous 0.9% sodium chloride given over 20 minutes through a peripheral intravenous line as the placebo arm of the study.

Protocol document:
ICF_000.pdf: 
Michael Johnson, MD, MS 
 
Page 1 of 9 
Intravenous Magnesium: Prompt use for Asthma in Children Treated in the Emergency Department (IMPACT-ED) Pilot 
Consent/Parental Permission Form dated 03Mar2023 
 
FOOTER FOR IRB USE ONLY 
Version: K0218 
 
 
University of Utah 
Institutional Review Board 
Approved 5/10/2023 
Expires 1/3/2024 
IRB_00104082 
 
 
 
Parental Permission and Authorization Document 
 
Your child is being asked to take part in a research study. Participating in the study is voluntary, which 
means you can choose whether or not you want your child to continue. Before you decide it is 
important for you to know why the research is being done and what it will involve. Please take time to 
read the following information carefully. Ask us if there is anything that is not clear or if you would like 
more information. Take time to decide whether or not you will allow your child to take part in this study. 
If you decide to allow your child to participate in the study, you will be asked to sign this form. 
 
Your child was severely sick with asthma when you came to this emergency department.  This is called 
severe acute asthma. The doctors and nurses began treatment for asthma right away, but many children 
who are this sick do not recover completely with the normal treatments including albuterol and steroids.  
We do not know if another medicine called intravenous (IV) magnesium sulfate (Mg) can help children 
with severe acute asthma. The purpose of this study is to learn whether IV Mg can help some children 
get better enough to go home after treatment in the emergency department and avoid hospitalization. 
 
BACKGROUND 
 
Most problems related to asthma can be managed with medication at home or during a short period of 
treatment in the emergency department. For most children, breathing albuterol and swallowing a 
steroid medicine is enough to improve and go home from the emergency department. About a third of 
children need to be hospitalized for more treatment. The medicine we are studying, IV Mg, may help the 
lungs open and the child breathe easier even if other medicines aren’t working well. This medicine is 
promising for children with asthma because it is simply a salt that is already found in the body, it is 
cheap, it has been used for many years in children with asthma, and it has been safely used and studied 
in other diseases, including diseases during pregnancy.  
 
We give IV Mg as a liquid through an intravenous line, which is a small tube placed through the skin 
directly into a vein. This allows it to go quickly into the blood and reach the lungs even if there is trouble 
breathing or trouble swallowing other medicines. There have been no studies to find out which amount 
of IV Mg is best to improve breathing or if the medicine works well enough for a child to avoid 
hospitalization. In this study, we are testing two different amounts of IV Mg against a placebo. A placebo 
is a small amount of water and salt given just like the medicine through the IV, but without the medicine 
in it. This is important to understand how children who receive the medicine respond differently to 
children who don’t receive it, and how children who receive a higher amount of medicine respond 
differently to children who receive a lower amount. Because your child and the other children in this 
study are sick, it is important that we start these medicines as soon as possible. Part of the purpose of 
this study is to see if children can be successfully given medicine quickly as part of this study so that a 
larger study can be performed in the future. 
 


Michael Johnson, MD, MS 
 
Page 2 of 9 
Intravenous Magnesium: Prompt use for Asthma in Children Treated in the Emergency Department (IMPACT-ED) Pilot 
Consent/Parental Permission Form dated 03Mar2023 
 
FOOTER FOR IRB USE ONLY 
Version: K0218 
 
 
University of Utah 
Institutional Review Board 
Approved 5/10/2023 
Expires 1/3/2024 
IRB_00104082 
 
 
IV Mg is an investigational drug in this study. It has been studied in other trials of children with asthma 
but has not been approved by the Food and Drug Administration (FDA) for use in children with asthma. 
Doctors have used IV Mg in children with asthma for many years.  Doctors are allowed to, and 
commonly do, use unapproved medications like this, even if the medicines are not labeled by FDA for 
that particular use. This study is an important step in understanding the medicine better so that it can 
be considered for approval by the FDA.  
 
STUDY PROCEDURES 
 
What happens in this study?   
 
Everyone in this study gets a single dose of a small amount of study fluid given into a vein over 20 
minutes, followed by another small amount of fluid mixed with a small amount of salt to flush the IV. 
Everyone will be randomly assigned to receive either fluid without IV Mg (placebo), fluid with a lower 
amount of IV Mg, or fluid with a larger amount of IV Mg. Random means assigned by chance, like the flip 
of a coin.  During this study, two of every three patients will get IV Mg.  
Neither you or your doctor will know which of the three possible study fluids your child will receive.  The 
doctors caring for your child in the hospital can be told what medicine he/she was given if needed.  
Three blood draws, up to 5 ml total of blood (1 teaspoon), will be collected for study purposes. These 
will be collected through the IV already in place, and will not involve additional needle pokes. To collect 
blood through the IV, we use a small device that connects to it called PIVO. The company that makes 
this device, BD Medical, will be providing them for use in this study. This blood will be frozen and sent to 
a research laboratory at University of California Davis to measure the amount of magnesium in the 
blood, along with a few other basic blood tests. These test results will not be available while your child is 
being treated in the Emergency Department and will not be in your child’s medical record. After these 
tests have been completed, any remaining blood in the samples will be destroyed.  
No other aspect of your child’s routine medical care will be affected by enrollment in the study.  As part 
of your child’s regular medical care, he/she may be treated later with IV Mg, or different medicines, but 
not as part of the study. 
 
Here is what has happened so far:  
 
Some medical information about your child and his/her condition has been looked at to decide if it was 
appropriate to talk to you about this study.  A doctor examined your child and started treating him/her 
medically with standard asthma medications. 
The doctor performed a standard clinical assessment of your child’s trouble breathing to know that your 
child is sick enough to be in the study.  
 
What am I being asked to do? 
 
Now, you are being asked to decide whether or not your child will participate in this study.  


Michael Johnson, MD, MS 
 
Page 3 of 9 
Intravenous Magnesium: Prompt use for Asthma in Children Treated in the Emergency Department (IMPACT-ED) Pilot 
Consent/Parental Permission Form dated 03Mar2023 
 
FOOTER FOR IRB USE ONLY 
Version: K0218 
 
 
University of Utah 
Institutional Review Board 
Approved 5/10/2023 
Expires 1/3/2024 
IRB_00104082 
 
 
Participating in the study involves placing an IV line, collecting three blood samples at different times 
through the IV, and giving your child study fluid that may or may not contain IV Mg.  If you decide to 
continue participating, you also allow us to collect some medical information about your child and how 
he/she is doing until the time they are discharged from the hospital. If you are sent home from the ED, 
we will contact you about 1 - 2 days later and in one week to find out how your child is doing. 
If you decide to continue participating in this study, the researchers will continue to collect your medical 
information only until you are discharged from the hospital. There is no time commitment being 
requested from you aside from the one follow up phone calls 1 – 2 days after your child is sent home 
and  one week. 
 
RISKS 
 
The medical risks and discomforts of being in the study are similar to the risks of getting standard care.  
Continued severe acute asthma is associated with serious medical risks.  These risks are not affected by 
participation in the study.  
 
The study medicine, IV Mg, has some known risks at higher doses though these risks are extremely rare 
at the doses used in this study.  The risks of the study medicines are the same whether they are given in 
the study or for treatment of asthma outside of this study. About 1 out of every 10 children who receive 
IV Mg have a brief drop in their blood pressure, enough to be measured but not enough to cause any 
symptoms or need treatment.  Mild discomforts are more common, but limited to the 20 minutes while 
the medicine is being given. These include diarrhea, nausea, facial flushing, and stomach cramping.  
 
Since all of the medications used in this study are routinely used as part of standard care, your child 
would have likely experienced some of these risks whether or not he/she was in this study.  One of the 
risks of participating in the research is related to the randomization.  Because your child’s treatment was 
randomized (like flipping a coin), the doctor did not have a choice as to which treatment your child 
received.  If there had been a problem related to the randomization, your child would have been 
immediately withdrawn from the study and the doctor would have treated your child as he/she believed 
was best for your child’s condition. 
 
There is also a risk of breach of confidentiality related to participation in the study.  We will do our best 
to keep all of your medical information that we collect confidential.  We will keep your study 
information in a secure location during and after the study.  Only the members of the study team and 
the persons and entities listed below will have access to your medical information for the study. 
 
REPRODUCTIVE RISKS 
 
Though IV Mg is approved for use in late pregnancy to prevent and treat seizures in the setting of 
preeclampsia and eclampsia, it is unknown how it affects pregnancy when given for asthma, especially 
at other points in the pregnancy. For this reason, we will not include any patients who are pregnant. We 


Michael Johnson, MD, MS 
 
Page 4 of 9 
Intravenous Magnesium: Prompt use for Asthma in Children Treated in the Emergency Department (IMPACT-ED) Pilot 
Consent/Parental Permission Form dated 03Mar2023 
 
FOOTER FOR IRB USE ONLY 
Version: K0218 
 
 
University of Utah 
Institutional Review Board 
Approved 5/10/2023 
Expires 1/3/2024 
IRB_00104082 
 
 
will do pregnancy tests in girls who are 12 years or older. The pregnancy test must be negative to 
participate in this study.  
 
UNFORESEEABLE RISKS 
 
In addition to the risks listed above, your child may experience a previously unknown risk or side effect.  
 
What are the possible benefits? 
Because we do not know which of the amounts of medicine is better, your child may benefit from 
receiving a higher amount, but this is not guaranteed.  Depending on when your child is enrolled in the 
study, there may be an increased likelihood of being given the best medication.  You may not get any 
benefit from being in this research study.  However, the information that we get from this study may 
benefit patients in the future.  
 
What happens if I choose not to continue in the study? 
 
Being in this study is entirely voluntary.  You are also free to withdraw your permission for your child to 
continue in the study at any time. If you decide not to continue your child’s participation, your decision 
will not affect your child’s current or future medical care in any way. You may ask and will receive 
responses to any questions during the course of the study.  If you choose not to continue, no further 
information will be collected about your child. 
 
PERSON TO CONTACT 
 
If you have questions, complaints or concerns about this study, you can contact Dr. Michael Johnson at 
801-935-0503.  If you think your child may have been injured from being in this study, please call the 
Primary Children’s Hospital Emergency Department at 801-662-1200. The emergency department can 
be reached at this number during 24-hours a day. 
 
Institutional Review Board: Contact the Institutional Review Board (IRB) if you have questions regarding 
your child’s rights as a research participant. Also, contact the IRB if you have questions, complaints or 
concerns which you do not feel you can discuss with the investigator. The University of Utah IRB may be 
reached by phone at (801) 581-3655 or by e-mail at irb@hsc.utah.edu.   
 
Research Participant Advocate:  You may also contact the Research Participant Advocate (RPA) by 
phone at (801) 581-3803 or by email at participant.advocate@hsc.utah.edu.  
 
RESEARCH-RELATED INJURY 
 
If your child is injured from being in this study, medical care is available Primary Children's Hospital, as it 
is to all sick or injured people. The University of Utah and Primary Children’s Hospital have not set aside 
any money to pay the costs for such care.  The University and Primary Children’s Hospital will work with 


Michael Johnson, MD, MS 
 
Page 5 of 9 
Intravenous Magnesium: Prompt use for Asthma in Children Treated in the Emergency Department (IMPACT-ED) Pilot 
Consent/Parental Permission Form dated 03Mar2023 
 
FOOTER FOR IRB USE ONLY 
Version: K0218 
 
 
University of Utah 
Institutional Review Board 
Approved 5/10/2023 
Expires 1/3/2024 
IRB_00104082 
 
 
you to address costs from injuries. Costs would be charged to you or your insurance company (if you 
have insurance), to the study sponsor or other third party (if applicable), to the extent those parties are 
responsible for paying for medical care your child receives. Since this is a research study, some health 
insurance plans may not pay for the costs. By signing this consent form you are not giving up your right 
to pursue legal action against any parties involved with this research. 
 
The University of Utah is a part of the government. If your child is injured in this study, and you want to 
sue the University or the doctors, nurses, students, or other people who work for the University, special 
laws may apply. The Governmental Immunity Act of Utah is a law that controls when a person needs to 
bring a claim against the government, and limits the amount of money a person may recover. See 
sections 63G -7-101 to -904 of the Utah Code. 
 
RIGHT OF PHYSICIANS TO STOP THE STUDY 
 
The doctors treating your child can stop the treatment medication if they feel this is best for your child’s 
safety. If this happened, they would treat your child following standard care and best judgment. 
 
COSTS AND COMPENSATION TO PARTICIPANTS 
 
You or your child will not be paid to be in the study.  The study medicines will be provided free of 
charge.  However, medical care received during this hospital visit will still be billed to you and/or your 
insurance according to hospital policy.  If you received a bill that you believe is related to your taking 
part in this research study, please contact the study team.   
 
NEW INFORMATION 
 
You will be told of any new information discovered during your participation that may affect your choice 
to continue in the study.  We may contact you when the study is completed to share the results.  
 
NUMBER OF PARTICIPANTS 
 
About 90 children at 3 hospitals across the United States will participate in this study.  Enrollment will 
take place over about 7 months. About30 children will be enrolled here at Primary Children’s Hospital. 
No one will be included or prevented from participating based on gender, race, color, economic status, 
or national origin. 
 
AUTHORIZATION FOR USE OF YOUR CHILD’S PROTECTED HEALTH INFORMATION  
 
Signing this document means you allow us, the researchers in this study, and others working with us to 
use some information about your child’s health for this research study. 
 
This is the information we will use and include in our research records:  


Michael Johnson, MD, MS 
 
Page 6 of 9 
Intravenous Magnesium: Prompt use for Asthma in Children Treated in the Emergency Department (IMPACT-ED) Pilot 
Consent/Parental Permission Form dated 03Mar2023 
 
FOOTER FOR IRB USE ONLY 
Version: K0218 
 
 
University of Utah 
Institutional Review Board 
Approved 5/10/2023 
Expires 1/3/2024 
IRB_00104082 
 
 
 
- 
Demographic and identifying information like your child’s name, medical record number(s) 
and contact information  
 
- 
Related medical information about your child like his/her condition and treatment in the 
emergency department, medical history, some tests and findings during the hospitalization, 
adverse events, and the dates of hospital admission and discharge 
 
 
- 
All tests and procedures that will be done in the study 
How we will protect and share your child’s information: 
 
We will do everything we can to keep your child’s information private but we cannot guarantee this. 
Study information will be kept in a secured manner and electronic records will be password protected. 
Study information may be stored with other information in your child’s medical record. Other doctors, 
nurses, and third parties (like insurance companies) may be able to see this information as part of the 
regular treatment, payment, and health care operations of the hospital. We may also need to disclose 
information if required by law. 
 
To protect your privacy, the information about you gathered for this study will be coded with a special 
study number.  Your name and information that could identify you will be stored securely at the site 
where you were enrolled or in the study database.  In order to conduct this study and make sure it is 
conducted as described in this form, the research records may be used and reviewed by others who are 
working with us on this research, including monitors and others from the study team or other groups 
with oversight or regulatory responsibilities.  These include: 
 
• 
Members of the research team and University of Utah and/or Primary Children’s 
Hospital 
• 
The University of Utah Institutional Review Board (IRB), who reviews research involving 
people to make sure the study protects your rights; 
• 
Other academic research centers we are working with: Children’s Hospital of 
Philadelphia, Nationwide Children’s Hospital, and a research coordinating office: Data 
Coordination Center of the University of Utah 
• 
University of California Davis 
• 
The study funding agency at National Heart, Lung, and Blood Institute, at the National 
Institutes of Health, and its affiliates 
• 
Food and Drug Administration 
• 
Study Data and Safety Monitoring Board 
• 
BD Medical, who is supplying the PIVO device for blood collection will receive a de-
identified summary of the data pertaining to the collect of blood samples  
 


Michael Johnson, MD, MS 
 
Page 7 of 9 
Intravenous Magnesium: Prompt use for Asthma in Children Treated in the Emergency Department (IMPACT-ED) Pilot 
Consent/Parental Permission Form dated 03Mar2023 
 
FOOTER FOR IRB USE ONLY 
Version: K0218 
 
 
University of Utah 
Institutional Review Board 
Approved 5/10/2023 
Expires 1/3/2024 
IRB_00104082 
 
 
In addition, records can be opened by court order or produced in response to a subpoena or a request 
for production of documents. 
 
Your child’s records will be kept for as long as necessary for purposes of the research study.  During that 
time they will be kept confidential to the extent permitted by law.  The results of this study could be 
published in an article, but would not include any information that would let others know who you are.  
Study results will be published by group only and no data shared publicly will include your child’s name 
or identifying information. 
 
A description of this clinical trial will be available on http://www.ClinicalTrials.gov, as required by U.S. 
Law.  This Web site will not include information that can identify you.  At most, the Web site will include 
a summary of the results.  You can search this Web site at any time.   
If you do not want us to use information about your child’s health, your child should not be part of this 
research.  
 
What if I decide to Not Participate after I sign the Consent and Authorization Form? 
 
You can tell us anytime that you do not want your child to be in this study and do not want us to use 
your child’s health information.  You can also tell us in writing.  If you change your mind, we will not be 
able to collect new information about your child, and your child will be withdrawn from the research 
study. However, we can continue to use information we have already started to use in our research, as 
needed to maintain the integrity of the research.   
This authorization does not have an expiration date.   
You have a right to information used to make decisions about your child’s health care. However, your 
child’s information from this study will not be available during the study; it will be available after the 
study is finished. 


Michael Johnson, MD, MS 
 
Page 8 of 9 
Intravenous Magnesium: Prompt use for Asthma in Children Treated in the Emergency Department (IMPACT-ED) Pilot 
Consent/Parental Permission Form dated 03Mar2023 
 
FOOTER FOR IRB USE ONLY 
Version: K0218 
 
 
University of Utah 
Institutional Review Board 
Approved 5/10/2023 
Expires 1/3/2024 
IRB_00104082 
 
 
CONSENT:   
I confirm that I have read this parental permission document and have had the opportunity to ask 
questions.  I will be given a signed copy of the parental permission form to keep. 
 
The research team for this study is interested in your experience with this consent process and may ask 
to talk to you about it further now, or in the future, to ask you a few questions about it. 
 
I agree to allow my child to participate in this research study and authorize you to use and disclose 
health information about my child for this study, as you have explained in this document. 
 
 
______________________________ 
 
 
 
_____________________________ 
Child’s Name 
 
 
 
 
 
 
Parent/Guardian’s Name 
 
______________________________ 
 
 
 
_____________________________ 
Relationship of Parent/Guardian to Child  
 
 
Parent/Guardian’s Signature 
 
 
 
 
 
 
 
 
 
_____________     _____________ 
 
 
 
 
 
 
 
 
Date 
 
 
Time (24 hr) 
 
______________________________ 
Name of Person Obtaining Authorization and Consent 
 
______________________________ 
 
 
 
____________     _____________ 
Signature of Person Obtaining Authorization and Consent 
Date 
 
       
Time (24 hr) 
 
 


Michael Johnson, MD, MS 
 
Page 9 of 9 
Intravenous Magnesium: Prompt use for Asthma in Children Treated in the Emergency Department (IMPACT-ED) Pilot 
Consent/Parental Permission Form dated 30Nov2022 
FOOTER FOR IRB USE ONLY 
Version: K0218 
 
 
University of Utah 
Institutional Review Board 
Approved 5/10/2023 
Expires 1/3/2024 
IRB_00104082 
 
Informed Withdrawal Addendum  
(Attach to informed consent document only when a participant chooses to withdraw.) 
 
SIGNATURES: Sign below if you understand the information given to you about the research and choose 
not to continue.  Make sure that any questions have been answered and that you understand the study.  
If you have any questions or concerns about your rights as a research subject, you may contact the 
Research Participant Advocate (RPA) by phone at (801) 581-3803 or by email at 
participant.advocate@hsc.utah.edu.  
 
Although you are opting not to continue in the study, we are interested in your experience so that we 
can learn more about how patients feel about this type of medical research.  We may ask to talk to you 
about your experience further now, or in the future, to answer a few questions about it.  Check here if 
you do not want to be asked. ▢ 
 
 
 
______________________________ 
 
 
 
_____________________________ 
Child’s Name 
 
 
 
 
 
 
Parent/Guardian’s Name 
 
______________________________ 
 
 
 
_____________________________ 
Relationship of Parent/Guardian to Child  
 
 
Parent/Guardian’s Signature 
 
 
 
 
 
 
 
 
 
_____________     _____________ 
 
 
 
 
 
 
 
 
Date 
 
 
Time (24 hr) 
 
______________________________ 
Name of Person Obtaining Authorization and Consent 
 
______________________________ 
 
 
 
____________     _____________ 
Signature of Person Obtaining Authorization and Consent 
Date 
 
       
Time (24 hr) 
 
 
 
 
 

ICF_001.pdf: 
Michael Johnson, MD, MS 
 
Page 1 of 3 
Intravenous Magnesium: Prompt use for Asthma in Children Treated in the Emergency Department (IMPACT-ED) Pilot 
Assent Form dated 30Nov2022 
FOOTER FOR IRB USE ONLY 
Version: K0218 
 
 
University of Utah 
Institutional Review Board 
Approved 1/4/2023 
Expires 1/3/2024 
IRB_00104082 
 
Assent to Participate in a Research Study 
 
Who are we and what are we doing? 
We are from the University of Utah and Primary Children’s Hospital. We would like to ask if you 
would be in a research study. A research study is a way to find out new information about 
something.    
 
Why are we asking you to be in this research study? 
We are asking you to be in this research study because you are very sick with trouble breathing 
because of asthma. A medicine called magnesium sulfate (Mg) may help your trouble breathing 
with asthma and we want to learn more about how it works in your body. Being in this study is 
not part of your regular medical care.   
 
About 30 children between the ages of 2 and 17 will participate in this study at Primary 
Children’s Hospital. 
 
What happens in the research study? 
If you decide to be in this research study, this is what will happen: 
• We will have your nurse place an intravenous (IV) line to give the study medicine, which 
is a small amount of fluid given right into one of your veins, usually on your arm or hand. 
• Your nurse will give you a small amount of study fluid over 20 minutes, which may or 
may not have the study medicine (Mg).  
• We will collect a small amount of blood from your IV at three time-points:  
o Before you are given the study fluid 
o After you are given Mg: 
§ 30 minutes 
§ 2 hours or before discharge 
• If you are a female 12 years old or older, we will do a pregnancy test (blood or urine) to 
make sure you are not pregnant before getting the study medicine. You must not be 
pregnant to participate in this research study.    
 
Will any part of the research study hurt you? 
There is a chance that during this research study you could feel afraid, uncomfortable, or hurt. 
We will try to help you feel better if this happens. Some children who receive Mg feel warm or 
have an upset stomach. This should go away as soon as we stop giving the medicine.  
 
Blood draws: During the study you will have blood samples taken. Extra blood will be collected 
from the same line used to give you the study fluid. 


Michael Johnson, MD, MS 
 
Page 2 of 3 
Intravenous Magnesium: Prompt use for Asthma in Children Treated in the Emergency Department (IMPACT-ED) Pilot 
Assent Form dated 30Nov2022 
FOOTER FOR IRB USE ONLY 
Version: K0218 
 
 
University of Utah 
Institutional Review Board 
Approved 1/4/2023 
Expires 1/3/2024 
IRB_00104082 
 
 
 
Will the research study help you or anyone else?  
About 2 out of every 3 children in this study will receive Mg . The other children will receive a 
small amount of water and salt. Mg could help you breathe easier. It is possible that we could 
learn something to help other people being given Mg in the future.  
 
Who will see the information about you? 
Only the researchers or others who are doing their jobs will be able to see the information 
about you from this research study. We will talk about this information with you, your doctors, 
and your parents.   
 
What if you have any questions about the research study? 
It is okay to ask questions. If you don’t understand something, you can ask us. We want you to 
ask questions now and anytime you think of them. If you have a question later that you didn’t 
think of now, you can call Michael Johnson at (801) 935-0503 or ask us the next time we see 
you. 
 
Do you have to be in the research study? 
You do not have to be in this study if you don’t want to. Being in this study is up to you. No one 
will be upset if you don’t want to do it. Even if you say yes now, you can change your mind later 
and tell us you want to stop. You can take your time to decide. You can talk to your parent or 
guardian before you decide. We will also ask your parent or guardian to give their permission 
for you to be in this study. But even if your parent or guardian say “yes” you can still decide not 
to be in the research study. Your doctors will continue to take care of you even if you decide 
not to be in this research study. 
 
 
 
 
 
 
 
 
 
 
 
 


Michael Johnson, MD, MS 
 
Page 3 of 3 
Intravenous Magnesium: Prompt use for Asthma in Children Treated in the Emergency Department (IMPACT-ED) Pilot 
Assent Form dated 30Nov2022 
FOOTER FOR IRB USE ONLY 
Version: K0218 
 
 
University of Utah 
Institutional Review Board 
Approved 1/4/2023 
Expires 1/3/2024 
IRB_00104082 
 
 
 
 
 
Agreeing to be in the study 
I was able to ask questions about this study.  Signing my name at the bottom means that I agree 
to be in this study. My parent or guardian and I will be given a copy of this form after I have 
signed it. 
 
 
 
 
Printed Name  
 
 
 
Sign your name on this line 
 
Date 
 
 
 
 
 
Printed Name of Person Obtaining Assent 
 
 
 
Signature of Person Obtaining Assent 
 
Date 
 
 
 
 
The following should be completed by the study member conducting the assent process 
if the participant agrees to be in the study. Initial the appropriate selection: 
 
__________ 
The participant is capable of reading the assent form and has signed 
above as documentation of assent to take part in this study. 
 
 
__________ 
The participant is not capable of reading the assent form, but the 
information was verbally explained to him/her. The participant 
signed above as documentation of assent to take part in this study. 
 
 
 
 

Prot_SAP_002.pdf: 
Intravenous Magnesium: Prompt use for Asthma in Children
Treated in the Emergency Department
(IMPACT-ED)
PECARN Protocol Number 054
Pediatric Emergency Care Applied Research Network
National Heart, Lung, and Blood Institute (NHLBI)
Protocol Version 1.05
Version Date: March 15, 2023
Printing Date: March 15, 2023


Protocol 054 (Johnson)
Page 2 of 48
Copyright © 2016-2017. University of Utah School of Medicine on behalf of the Principal Investi-
gator, Michael D. Johnson, M.D. and the Pediatric Emergency Care Applied Research Network
(PECARN). All rights reserved.
This protocol is PECARN Protocol Number 054, and has been authored by Michael D. Johnson,
M.D., University of Utah, for implementation with the PECARN investigators. This study is sup-
ported by the grant anticipated to be awarded to University of Utah (PI:Michael D. Johnson, M.D.)
by the National Heart, Lung, and Blood Institute in response to application 1 R34 HL152047-01A1.
The PECARN Research is supported by the Health Resources and Services Administration (HRSA)
of the U.S. Department of Health and Human Services (HHS), in the Maternal and Child Health
Bureau (MCHB), under the Emergency Medical Services for Children (EMSC) program through
the following cooperative agreements: DCC-University of Utah (UJ5MC30824), GLEMSCRN-
Nationwide Children’s Hospital (U03MC28844), HOMERUN-Cincinnati Children’s Hospital Med-
ical Center (U03MC22684), PEMNEWS-Columbia University Medical Center (U03MC00007),
PRIME-University of California at Davis Medical Center (U03MC00001), CHaMP node – State
University of New York at Buffalo (U03MC33154), WPEMR – Seattle Children’s Hospital
(U03MC33156), and SPARC- Rhode Island Hospital/Hasbro Children’s Hospital (U03MC33155).
This information or content and conclusions are those of the author and should not be construed as
the official position or policy of, nor should any endorsements be inferred by HRSA, HHS or the
U.S. Government.
This document was prepared by the PECARN Data Coordinating Center (DCC) located at the
University of Utah School of Medicine, Salt Lake City, Utah. The document was written and
typeset using LATEX2ε”. The DCC at the University of Utah is supported by Cooperative Agreement
UJ5MC30824 from the Emergency Medical Services for Children (EMSC) Program, Maternal and
Child Health Bureau, Health Resources and Services Administration.
IMPACT-ED Protocol Version 1.05
Protocol Version Date: March 15, 2023
The EMSC Pediatric Emergency Care Applied Research Network


Protocol 054 (Johnson)
Page 3 of 48
PROTOCOL TITLE:
Intravenous Magnesium: Prompt use for Asthma in Children Treated in the Emergency Department
Short Title: IMPACT-ED
PECARN Protocol Number: 054
Lead Investigator and Author:
Michael D. Johnson, M.D.
University of Utah
Protocol Version: 1.05
Version Date: March 15, 2023
I confirm that I have read this protocol, I understand it, and I will conduct the study according to
the protocol. I will also work consistently with the ethical principles that have their origin in the
Declaration of Helsinki and will adhere to the Ethical and Regulatory Considerations as stated. I
confirm that if I or any of my staff are members of the Institutional Review Board, we will abstain
from voting on this protocol, its future renewals, and its future amendments.
Principal Investigator Name:
Principal Investigator Signature:
Date:
IMPACT-ED Protocol Version 1.05
Protocol Version Date: March 15, 2023
The EMSC Pediatric Emergency Care Applied Research Network
Michael D. Johnson MD
16 March 2023


Protocol 054 (Johnson)
Page 4 of 48
THIS PAGE IS INTENTIONALLY BLANK.
IMPACT-ED Protocol Version 1.05
Protocol Version Date: March 15, 2023
The EMSC Pediatric Emergency Care Applied Research Network


Contents
Contents
5
List of Tables
7
List of Figures
7
1
Study Summary
8
1.1
Hypotheses
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9
1.2
Specific Aims . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9
2
Rationale and Background
9
2.1
Hospitalization for Children With Asthma . . . . . . . . . . . . . . . . . . . . . .
9
2.2
Intravenous Magnesium Sulfate (IVMg) May Reduce Hospitalization for Children,
But Is Used Variably
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
10
2.3
IVMg Has Not Been Adequately Studied in Children With Asthma . . . . . . . . .
11
2.4
Rationale
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
13
3
Subject Eligibility, Accrual and Study Duration
17
3.1
Eligibility Criteria . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
17
3.2
Subject Accrual and Study Duration . . . . . . . . . . . . . . . . . . . . . . . . .
17
4
Overall Study Design
18
5
Study Procedures and Data Collection
18
5.1
Screening Schedule . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
18
5.2
Screening and Enrollment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
18
5.3
Randomization
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
19
5.4
Study Drug Administration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
19
5.4.1
Acquisition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
19
5.4.2
Preparation, Storage & Labeling . . . . . . . . . . . . . . . . . . . . . . .
19
5.4.3
Dosing Schedule
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
20
5.4.4
Dose Modification for Potential Toxicity . . . . . . . . . . . . . . . . . . .
20
5.4.5
Accountability
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
20
5.4.6
Unblinding Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . .
21
5.4.7
Discontinuation of Study Drug . . . . . . . . . . . . . . . . . . . . . . . .
21
5.5
Withdrawal from Study . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
21
6
Data Collection
21
6.1
Baseline Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
21
6.2
Follow-up Assessment(s) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
22
6.3
Medical Record Review . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
23
6.4
Instruments
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
23
7
Data Analysis
23
5


Protocol 054 (Johnson)
Page 6 of 48
7.1
Specific Aim Analyses
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
23
7.2
Sample Size Calculations and Statistical Power
. . . . . . . . . . . . . . . . . . .
26
7.3
Other relevant statistical topics...
. . . . . . . . . . . . . . . . . . . . . . . . . .
26
8
Data Management
27
8.1
Clinical Site Data Management . . . . . . . . . . . . . . . . . . . . . . . . . . . .
27
8.2
Data Coordinating Center . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
27
8.2.1
Data Center Description
. . . . . . . . . . . . . . . . . . . . . . . . . . .
27
8.2.2
Security, Support, Encryption, and Confidentiality . . . . . . . . . . . . . .
28
8.3
Electronic Data Capture System
. . . . . . . . . . . . . . . . . . . . . . . . . . .
28
8.4
Study Monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
29
8.4.1
Site Monitoring Plan . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
29
8.4.2
Clinical Site Monitoring
. . . . . . . . . . . . . . . . . . . . . . . . . . .
29
8.4.3
Remote Monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
29
8.4.4
Pharmacy Monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
30
8.5
Record Access . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
30
9
Protection of Human Subjects
30
9.1
Institutional Review Board (IRB) Approval
. . . . . . . . . . . . . . . . . . . . .
30
9.2
Informed Consent . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
31
9.3
Potential Risks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
31
9.4
Protections Against Potential Risks . . . . . . . . . . . . . . . . . . . . . . . . . .
32
9.5
Potential Benefits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
33
9.6
Risk Benefit Assessment
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
33
10 Data and Safety Monitoring Plan
34
10.1 Data Safety Monitoring Board (DSMB)
. . . . . . . . . . . . . . . . . . . . . . .
34
10.2 Safety Monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
35
10.3 Adverse Event Reporting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
35
10.3.1 Definition of Adverse Event and Serious Adverse Event . . . . . . . . . . .
35
10.3.2 Classification of an Adverse Event (Relatedness, Severity, and Expectedness 36
10.3.3 Data Collection Procedures for Adverse Events . . . . . . . . . . . . . . .
38
10.3.4 Reporting Monitoring Serious Adverse Events . . . . . . . . . . . . . . . .
38
10.3.5 Reporting and Monitoring Unanticipated Problems (UP)
. . . . . . . . . .
39
10.3.6 Possible Emergent Enrollment Suspension . . . . . . . . . . . . . . . . . .
39
10.3.7 Early Study Termination . . . . . . . . . . . . . . . . . . . . . . . . . . .
40
10.3.8 Follow-up of Serious, Unexpected and Related Adverse Events . . . . . . .
40
10.3.9 Reporting Mechanisms for Changes or Amendments to Protocol or Consent
Form
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
40
10.3.10IND Information
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
41
11 Study Training
41
12 Regulatory Considerations
42
12.1 Food and Drug Administration . . . . . . . . . . . . . . . . . . . . . . . . . . . .
42
IMPACT-ED Protocol Version 1.05
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12.2 Health Insurance Portability and Accountability Act . . . . . . . . . . . . . . . . .
42
12.3 Inclusion of Women and Minorities . . . . . . . . . . . . . . . . . . . . . . . . . .
42
12.4 ClinicalTrials.gov Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . .
42
12.5 Retention of Records . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
42
12.6 Public Use Data Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
43
13 Bibliography
43
List of Tables
1
Randomized Controlled Trials of IVMg in Children with Acute Asthma
. . . . . .
10
2
Pediatric Respiratory Assessment Measure (PRAM) . . . . . . . . . . . . . . . . .
16
3
Study Timeline
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
18
List of Figures
1
Schedule of Activities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
22
7


Protocol 054 (Johnson)
Page 8 of 48
Abstract
Asthma is the most common chronic illness of childhood and a leading cause of hospital-
ization and healthcare costs for children. Most children hospitalized for asthma first receive
breathing treatments and steroid medicines in an emergency department (ED) according to
national guidelines. An additional medicine, intravenous magnesium sulfate (IVMg), may help
severely sick children avoid hospitalization. National asthma guidelines recommend IVMg for
severely sick children, but note a lack of consistent evidence to support this recommendation.
Only about one in four children hospitalized for asthma received IVMg in the ED. Estimates
of the potential effects of broader use of IVMg on hospitalization are limited by the small
size of prior trials, but increased use could potentially avoid 16,500 hospitalizations each year,
producing direct cost savings of $65 million yearly in addition to saving significant indirect
costs of missed school and parental work.
A few major questions remain about IVMg. First, it has not been tested early in ED
treatment, when the impact on hospitalization would be greatest. Second, the clinical impact of
hypotension, a driver of low utilization, is not characterized in prior trials or clinical databases.
Third, no trials have compared different IVMg doses or measured serum magnesium levels to
optimize dosing, so the most effective dose is unknown.
All prior trials of IVMg in children with asthma have been small. A large randomized,
placebo-controlled clinical trial of IVMg that could answer whether IVMg can reduce hospi-
talization might be challenging for a few reasons. First, enrolling patients fast enough to give
IVMg early in ED treatment is challenging. Second, understanding blood pressure changes
after IVMg is essential to plan safety monitoring for a larger trial. Third, little pharmacologic
information has been gathered to guide the doses of IVMg to be tested. We must conduct a
small pilot clinical trial to test our procedures and gather necessary information to plan the large
trial.
The Pediatric Emergency Care Applied Research Network (PECARN) is a network of
children’s EDs that has conducted similar research involving acutely ill children. Our goals in
this project are to:
1. Demonstrate the feasibility of enrolling children in the ED with severe acute asthma in a
multicenter, randomized, controlled trial of placebo, low-dose IVMg, or high-dose IVMg.
2. Demonstrate the feasibility of timely delivery of study medication to enrolled patients and
assessment of blood pressure and associated adverse events in a standardized protocol.
3. Externally validate a previously constructed PK model and develop a combined PK/PD
model for IVMg using magnesium (total and ionized) serum concentrations and their
correlation with measures of safety and respiratory distress in children with asthma.
After completing this pilot trial in three sites, we will plan a multi-center randomized trial
of IVMg in children with severe acute asthma at more sites to enroll enough children to know if
IVMg can reduce hospitalization.
1
Study Summary
Many children currently being hospitalized with severe asthma could potentially avoid hospitaliza-
tion and be sent home if their treatment in the emergency department was more effective. We will
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Protocol 054 (Johnson)
Page 9 of 48
conduct a pilot trial that will lead to a larger study to conclusively answer whether a simple and
inexpensive medicine, intravenous magnesium sulfate, can be used in the emergency department to
prevent hospitalization for these children.
1.1
Hypotheses
Hypothesis: we can identify, consent, and enroll an average of 1 subject per site per week, resulting
in total enrollment of 90 patients in 7 months or less.
1.2
Specific Aims
This project has the following Specific Aims:
Specific Aim 1. Demonstrate the feasibility of enrolling children in the ED with severe acute
asthma in a multicenter, randomized, controlled trial of placebo, low-dose IVMg, or high-
dose IVMg.
Specific Aim 2. Demonstrate the feasibility of timely delivery of study medication to enrolled
patients and assessment of blood pressure and associated adverse events in a standardized
protocol.
Specific Aim 3. Externally validate a previously constructed PK model and develop a combined
PK/PD model for IVMg using magnesium (total and ionized) serum concentrations and their
correlation with measures of safety and respiratory distress in children with asthma.
2
Rationale and Background
2.1
Hospitalization for Children With Asthma is Common Despite Current
Standard Treatment
Asthma is the most common chronic illness of childhood and a leading cause of pediatric hospi-
talization, disability, and healthcare-related costs.1 Acute asthma resulted in 626,923 Emergency
Department (ED) visits2 and 75,905 hospitalizations3 in 2017 for children 0–17 years old in the
United States. Hospitalization is a primary driver of direct costs for asthma in children,4 contributing
$3.9 billion of the $5.9 billion in total pediatric asthma costs estimated in 2017,5 in addition to
indirect costs from school absenteeism and lost parental work.6
Current standard management of acute asthma in children is defined in guidelines published in 2007
by the National Heart, Lung, and Blood Institute (NHLBI) and includes inhaled bronchodilators
(albuterol and ipratropium), systemic corticosteroids, oxygen, and further treatment depending on
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Protocol 054 (Johnson)
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response.7 Although these guidelines have been broadly implemented, hospitalization remains a
common outcome for children with asthma after ED treatment, ranging from 13% to 50% of all
asthma visits among pediatric EDs nationally.8
2.2
Intravenous Magnesium Sulfate (IVMg) May Reduce Hospitalization for
Children, But Is Used Variably
IVMg may reduce hospitalization in children with asthma. Eight prior clinical trials reported results
of IVMg in children with acute asthma, though only five compared to placebo, and only three
evaluated hospitalization, all as a secondary outcome (bold, Table 1). These three trials included
31,9 30,10 and 5411 patients each, and reported absolute hospitalization reductions of 27%, 50%,
and 8% respectively. Meta-analysis of these three trials estimated the true reduction in odds of
hospitalization to be between 26% and 86%, an estimate that was less precise and not significant
after sensitivity analysis (OR 0.18, 95% CI 0.02 to 1.59).12
Table 1: Randomized Controlled Trials of IVMg in Children with Acute Asthma
lead
author
year
n
age
treatment
control
outcomes
Irazuzta
2015
38
6–18
50 mg/kg/hr for 4 hours (max 8 gm
in 4 hr)
IVMg 50 mg/kg
(no max) over one
hour
Discharge home
within 24 hours
Singhi
2014
100
1–12
50 mg/kg over 20 min (no max)
IV terbutaline, IV
aminophylline
Score reduction
Torres
2012
143
2–15
25 mg/kg over 20 min (max 2 g)
None
Mechanical
ventilation
Scarfone
2000
54
1–18
75 mg/kg over 20 min (max 2.5 g)
Saline placebo
Score reduction,
hospitalization
Ciarallo
2000
30
6–18
40 mg/kg over 20 min (max 2g)
Saline placebo
PEFR, FEV1,
FVC,
hospitalization
Gurkan
1999
20
6–16
40 mg/kg over 20 min (max 2 g)
Saline placebo
PEFR and score
reduction
Devi
1997
47
1–12
100 mg/kg over 35 min (no max)
Saline placebo
PEFR and SaO2
Ciarallo
1996
31
6–18
25 mg/kg over 20 min (max 2 g)
Saline placebo
PEFR,
hospitalization
PEFR: peak expiratory flow rate; SaO2: oxygen saturation; FEV1: forced expiratory volume in 1 second; FVC,
forced vital capacity.
bold: hospitalization as secondary outcome; italic: enrolled on arrival to ED.
IVMg has been used to treat asthma for more than 70 years13, 14 but its specific role in pediatric
asthma is still unclear.12 NHLBI asthma guidelines suggest that clinicians consider a 20-minute
infusion of IVMg in children or adults as an adjunct for life-threatening exacerbations, or for severe
distress after an hour of initial therapy, and do not suggest a specific dose, but rather provide a broad
three-fold dose range of 25–75 mg/kg. Conflicting evidence prevents a definitive recommendation
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Protocol 054 (Johnson)
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or direction for clinical implementation.7
The clinical effect of IVMg in asthma may involve multiple components of pulmonary and immune
physiology relevant in acute asthma. These mechanisms include directly relaxing smooth muscle,15
blocking calcium uptake in smooth muscle membranes through N-methyl-D-aspartate receptor-
gated channels,16, 17 inhibiting histamine and acetylcholine release at neuromuscular junctions,18, 19
and direct anti-inflammatory effects.20 Compared to adjunctive bronchodilators in severe acute
asthma such as IV aminophylline, IV terbutaline, and subcutaneous epinephrine, IVMg is better
tolerated, more widely available, and less expensive.21
IVMg is widely used in EDs to treat children with asthma, but use is variable. The Pediatric
Emergency Care Applied Research Network (PECARN), the first and only federally-funded pediatric
emergency medicine research network, maintains a Registry that collects complete medical record
data from the EDs of children’s hospitals and affiliated community hospitals. In a review of 7 sites in
the PECARN Registry conducted by Drs. Johnson (PI), Zorc (PI), Finkelstein (Co-I), Casper (OSC),
and colleagues, IVMg was administered in 6,497 of 61,854 ED visits (10.5%) for children with
asthma from 2011–2017.22 Of 22,499 children hospitalized for asthma in the PECARN Registry,
5,774 (25.7%) received IVMg in the ED, varying by site from 15.9% to 50.6% (see Figure 1 in A5.
Preliminary Work). In a comparable review of asthma care delivery in six pediatric EDs in Canada,
ED clinicians administered IVMg to 12% of children hospitalized with asthma, and to only 0.2% of
children discharged home.23 When surveyed, US and Canadian physicians generally reserve IVMg
to prevent admission to the intensive care unit (ICU), and only 7% of respondents use it to prevent
hospitalization.24
More broad and standardized use of IVMg, if effective, may reduce hospitalizations and related
healthcare costs for children, and would be cost-effective. An economic analysis of children with
asthma at two hospitals concluded that IVMg reduced costs by 28% and increased Quality-Adjusted
Life Years.25 Though estimates are limited by the size and number of prior trials, if IVMg produces
a 30% relative reduction in hospitalization, administering IVMg in the ED to children who do not
receive it in the US could avoid 16,500 hospitalizations each year at an average cost of $3,600
each,26 which would save $60 million yearly in direct costs in addition to indirect costs of missed
school and parental work. If IVMg is found to not be effective in a well-powered clinical trial,
its use could be appropriately guided and restricted by the trials results, future investigation can
focus on other therapies, and these findings should be included in institutional and national asthma
guidelines.
2.3
IVMg Has Not Been Adequately Studied in Children With Asthma
Sustained uncertainty persists about the role of IVMg for children with asthma. Each of the six
meta-analyses published in the past two decades analyzed the same three small trials and concluded
similarly that evidence to guide the use of IVMg is “extremely limited by the number and size
of studies”,12 that IVMg “has not been widely tested against what is considered guideline based
therapy”,27 that “further randomized controlled trials with large sample sizes are also required
to establish the optimal dosage”,28 that estimates of the effect of IVMg on hospitalization are
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Protocol 054 (Johnson)
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imprecise29 because “most of the included studies were small and not powered to detect potentially
important differences in hospital admission rates”,30 and that “additional research is required to
determine the optimal dose”.31
Previous trials of IVMg are insufficient to guide the clinical use of IVMg. Dosage protocols in
pediatric clinical trials ranged widely from a low of 25 mg/kg (maximum 2 grams)9 to a high of
100 mg/kg (no maximum),32 and no trial directly compared differing doses. No trial of IVMg has
evaluated hospitalization as a primary outcome. The largest dose in a trial that evaluated effect on
hospitalization as a secondary outcome was 75 mg/kg (maximum 2.5 grams).11 Dosage in clinical
practice is variable. Dosage in clinical practice ranged from 25–50 mg/kg in a review of IVMg use
in Canada.23 The majority (72.5%) of the 6,497 doses of IVMg recorded in the PECARN Registry
were 50 mg/kg, though 63 doses in the PECARN Registry were 75 mg/kg.22
Because prior trials of IVMg in children were small and have not compared different doses of IVMg,
the dose-response of IVMg with efficacy or safety is unknown.29 The safety of IVMg in children
with asthma in the ED has been systematically assessed in only 89 children who received it in five
separate placebo-controlled clinical trials;9–11, 32, 33 Fifteen children received 25 mg/kg in one trial,9
26 received 40 mg/kg across two separate trials,10, 33 24 received 75 mg/kg in one trial,11 and 24
received 100 mg/kg in one trial.32 No hypotension or other clinically significant side effects were
reported in these small trials. No clinically significant side effects were reported in 35 children
in a prospective observational study conducted by Drs. Johnson (PI) and Rower (Co-I)34 and in
53 children who received IVMg in a review of clinical use,35 though in another larger review of
clinical use by Dr. Zorc of 100 children who received IVMg 50 mg/kg in an ED, 11 (11%) had
hypotension recorded approximately 30 minutes after the start of infusion, 7 of whom received
intervention after IVMg, limited to an intravenous saline bolus.36 In an even larger cohort of 6,497
children who received IVMg in the PECARN Registry, 439 (6.8%) had hypotension recorded in
the ED after IVMg. These larger retrospective studies found hypotension after IVMg that was not
detected in small prospective trials, but lack detail necessary to understand the significance of blood
pressure changes after IVMg, whether it was associated with poor perfusion, or whether it led to
clinical interventions directed at hypotension.
The equipoise needed to study the effect of IVMg versus placebo on hospitalization in a large
clinical trial is illustrated by a combination of possible but uncertain clinical benefit for ill children,
variation in clinical use, lack of consensus regarding clinical benefit, and evidence gaps from prior
trials repeatedly outlined in meta-analysis. IVMg is inexpensive and readily available in current
clinical settings. IVMg has potential to improve the outcomes of ED treatment for children with
asthma, but requires further evaluation of its efficacy, safety, and optimal dosage in a robust trial
setting. PECARN has completed a prior NHLBI-funded randomized trial of IVMg in children with
sickle cell disease, an indication with much less supporting data for efficacy.37
This study focuses on IVMg, though other administration methods for magnesium have been
explored and deserve brief mention. Inhaled nebulized magnesium was suggested to have possible
benefit in children with asthma in a systematic review.27 However, a recent large multicenter
randomized trial of nebulized magnesium in children with asthma in 7 EDs in Canada found
no effect,38 similar to the findings of a randomized trial conducted at 30 hospitals in the United
Kingdom,39 similar to results in adults.40 Oral magnesium has no role in the treatment of acute
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asthma in the ED due to limited oral absorption41 and delayed onset of effect.42
2.4
Rationale
Before a definitive randomized, double-blind, placebo-controlled trial can be planned and completed
to determine the efficacy of IVMg on preventing hospitalization in pediatric asthma, several specific
knowledge gaps remain. We propose closing these knowledge gaps through a pilot trial that will
mirror the large conclusive trial as closely as possible, including study design, intervention arms,
procedures, study population, and outcome measures. Real-world implementation of the study
protocol in the pilot trial will allow us to test and refine trial procedures and simultaneously gather
data necessary and sufficient to plan the large trial.43 Specifically, the pilot trial will address the
following knowledge gaps:
First, prior trials evaluated IVMg for acute asthma only in children refractory to initial treat-
ment. This gave very little time during ED treatment to recognize improvement related to IVMg
administration prior to hospitalization. Timing of medication delivery in pediatric acute asthma
greatly affects a child’s probability of hospitalization. For example, in 406 children with moderate
or severe asthma in an ED, each 30 minute delay in administration of systemic corticosteroid after
triage increased the odds of hospitalization by 23%.44
Though IVMg is currently infrequently used in clinical practice in the ED to prevent hospitaliza-
tion,24 earlier administration could have a greater effect on this important outcome. In a placebo-
controlled trial in 30 children with suboptimal response to albuterol, those given IVMg versus
placebo had significant improvement in spirometry 20 minutes after the completion of IVMg
infusion.10 For children with acute asthma, the decision to hospitalize is often made within the first
130 minutes of treatment.45 For the effect of IVMg on hospitalization to be detectable within the
first 130 minutes of a normal ED visit, it must be given within 90 minutes of arrival in the ED,
providing 20 minutes for infusion of IVMg and 20 minutes after the end of infusion for a detectable
physiologic effect before the clinicians disposition decision is made. One fourth of children who
received IVMg in PECARN Registry EDs received it within 84 minutes after arrival, demonstrating
that early administration is not common, but possible.22 Administration early in the treatment course
would better align with the NHLBI recommendation that IVMg be considered after the first hour of
treatment.7 Only one prior trial of IVMg with hospitalization as an outcome attempted to enroll
children on arrival to the ED (bold and italicized, Table 1).11 Before a large trial can determine the
effect of early administration of IVMg on hospitalization, protocols to support administration in the
first 90 minutes of treatment should be tested and refined in a pilot trial setting.
Second, the safety of IVMg is not well characterized in prior trials. Earlier small trials reported
no significant adverse events after IVMg but included too few children to conclude adverse effects
were rare. Retrospective reviews of clinical practice suggest adverse effects associated with IVMg
are present, but lack sufficient detail to conclude if they have clinical impact. In a study by Dr. Zorc
(co-PI) of 100 children who received a single dose of 50 mg/kg in an ED, 7 of the 11 who had
hypotension after IVMg received an intravenous fluid bolus with normalization of blood pressure.36
Of the 4,392 children in the PECARN Registry who had blood pressure recorded within two hours
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both before and after IVMg, 294 (6.7%) had hypotension recorded after IVMg with an average
reduction of 14 mmHg (SD 14) from baseline and an average reduction of 6 mmHg (SD 5) below
normal age-adjusted values.22 However, the retrospective nature of the study database and the lack
of standardized monitoring prevents conclusions regarding the clinical impact of IVMg on blood
pressure. Data that is more detailed than current clinical data is needed to inform safety.
Safety data plays a critical role in informing large randomized controlled trials. A large trial could
attempt prolonged intensive blood pressure monitoring, but this places a major burden on clinical
and study staff, decreasing the likelihood of successful study enrollment. In addition, there is no
data to inform whether higher doses of IVMg have a dose-dependent effect on blood pressure,
information necessary to define a threshold of safety for dosage. Before a large trial of IVMg is
performed in an ED setting, intensive monitoring of blood pressure in patients receiving different
doses of IVMg in a limited study setting is necessary to understand the timing of blood pressure
changes, and whether hypotension after IVMg is transient without clinical impact, associated with
other systemic signs, prolonged, or more common in children given higher doses of IVMg. This will
inform planning for monitoring in the future trial that is focused, effective, and clinically feasible.
In a multinational survey of ED physicians, 24% reported hesitancy using IVMg in children because
of the risk of hypotension.24 Even if hypotension is transient, it is a major concern for physicians,
making it essential that our trial clarify concerns conclusively for clinicians.
The short half-life of IVMg may raise concern that by administering IVMg to a patient and then
discharging that patient home, a clinician has merely masked asthma symptoms temporarily, placing
the patient at risk for decompensation once the effect of IVMg resolves outside a healthcare setting.
Of 723 children discharged from PECARN EDs after receiving IVMg for asthma, only 13 (1.8%)
returned to the ED within 72 hours, which is less but not statistically different than the return
rate in patients discharged without receiving IVMg (3.5%).22 The size of a pilot trial does not
allow sufficient power to make definite conclusions regarding safety. However, collection of safety
outcomes in a trial environment, including data collected after discharge from the ED, will allow
enhancement and refinement of safety monitoring procedures for the future trial.
An additional component of safety is the risk of adverse effects due to serum concentrations of
magnesium above recommended thresholds. As an example from obstetric literature, therapeutic
effect in eclampsia occurs with serum magnesium (srMg) concentration between 2 and 4 mmol/L,
but srMg above 5 mmol/L can lead to loss of deep tendon reflexes and above 7.5 mmol/L to
respiratory depression.46 In the only published prospective examination of IVMg pharmacology
in children treated for asthma in the ED, Drs. Rower, Johnson, and colleagues observed that of 32
children given an IVMg dose of 50 mg/kg (2 gm maximum), the highest srMg was 1.4 mmol/L
and none experienced adverse effects.34 There is no published data from the ED describing serum
concentrations after children receive doses of IVMg larger than 50 mg/kg, though 24 children with
asthma received 75 mg/kg in a prior trial with no adverse effects.11 In eight children who received
75 mg/kg over 30–45 minutes followed by 40 mg/kg/hr for four hours in an ICU, the highest srMg
measured was 3 mmol/L, below toxic thresholds established in obstetrics, with an average (SD)
srMg at the end of infusion of 1.8 (0.4) mmol/L.47 A pilot trial would provide valuable data in
children with asthma to correlate dosing with both blood pressure and serum concentrations so that
doses used in a future trial are safe.
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Third, the optimal dosage of IVMg in pediatric acute asthma is unknown.28 Our current phar-
macologic understanding of IVMg is insufficient to define which doses should be tested in clinical
trials to carefully strike a balance between avoiding potential adverse effects and exploring maximal
clinical effect. To safely explore thresholds of efficacy and safety in a large trial, we must fill gaps
in the pharmacologic understanding of IVMg.
A serum biomarker for therapeutic effect would be valuable to allow rational dose selection for IVMg
in future trials. Mechanistically, bolus IVMg affects target tissue through a cascade of increased
ionized magnesium (ioMg) concentrations, first in the serum (extracellular) following infusion,
then in the extracellular space of the target tissue, followed by diffusion to the intracellular space
producing clinical effect. In this schema, the measurement of ioMg in the serum could be directly
related to the potential effect in the target tissue. The concentration of magnesium inside blood
cells, or intracellular magnesium (icMg), could be a closer surrogate for the concentration within
the target lung tissues, but is uncommonly tested even in research laboratories. A measurement of
all magnesium in the serum including ioMg and magnesium bound to serum proteins, srMg, is the
most common clinical measurement of magnesium. In obstetrics, a srMg value between 2 and 4
mmol/L appears to correlate to the desired clinical effect.48 In meta-analysis of obstetrical trials of
IVMg, dosage protocols that produce these serum concentrations are associated with no significant
toxicity.46
Unfortunately, directly applying the results of studies in pregnant adults to children with asthma
is inappropriate due to difference in anatomy, physiology, health status, and site of action of
IVMg. Pharmacologic data in children with asthma is limited to a very small case series,49 severely
ill patients in ICU settings47 including one conducted by Drs. Johnson and Rower,50 and one
prospective pharmacokinetic (PK) study conducted at a single ED by Drs. Rower, Johnson and
others.34 We found that bolus doses of 50 mg/kg produce srMg concentrations of 1–1.6 mmol/L,
below the low end of the range of therapeutic concentrations in pregnant adults. No study has
clarified the pharmacodynamic (PD) association of serum concentrations in asthma with clinical
effects such as change in respiratory distress or blood pressure. However, Drs. Johnson, Zorc,
Rower, and Finkelstein presented preliminary results in 28 children showing possible correlation of
increase in ioMg with decrease in clinical asthma severity score after IVMg, though the number of
patients was too small to confidently quantify correlation.51 All prior trials of IVMg in children with
asthma relied on likely therapeutic serum ranges and thresholds of toxicity developed from pregnant
adults. Therapeutic serum ranges for children have not been developed, and thresholds of toxicity
are guided by the small handful of studies just described. Despite being the most common clinical
measurement, srMg values are rarely obtained clinically in children with asthma; only four of the
6,497 administrations of IVMg across four sites in PECARN had srMg obtained before and after
infusion and no patients had icMg or ioMg measured.22 To define the optimal dose of IVMg, safety
and efficacy outcomes (PD) must be correlated with srMg (PK) obtained from a range of doses.
Informative PD analysis requires a marker of respiratory status that can be measured reliably and
repeatedly in all patients. Children in severe respiratory distress and young children are typically
unable to complete objective measures of lung function such as spirometry or peak flow. In
456 children 6–18 years old in an ED with acute asthma, only 54% could perform spirometry
at presentation.52 In 101 children 6–17 years old at a different ED only 35% could successfully
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perform spirometry at any point in the ED stay, however, clinical asthma scores were obtained in all
eligible children.53 The use of spirometry as inclusion criteria in most prior trials9, 10 excludes most
older patients in severe respiratory distress, and also excludes children four years and younger by
design, as they can rarely cooperate sufficiently to perform adequate spirometry.
To circumvent the aforementioned limitations of spirometry, clinical asthma scores have been used
as measures of respiratory status in prior trials, though rarely as inclusion criteria. The Pediatric
Respiratory Assessment Measure (PRAM) is a clinical respiratory score that presents the clinician
with a set of descriptors for 5 elements describing clinical findings, with each descriptor assigned
a numerical value. The clinician selects descriptors, and numerical values are summed to give
the overall score, with a scale 0–12. It is widely used to measure response in the ED as well as
in prior trials that showed clinical effect of IVMg on hospitalization (Table 2).9, 10 It has been
validated in children to be predictive of hospitalization54, 55 and to show change in respiratory
status after a bronchodilator.55 In a study performed by Dr. Johnson in 48 children 2–16 years old,
75% of children with a PRAM score in the severe range (8 or greater) at presentation to the ED
were hospitalized after ED treatment,56 demonstrating ability of the PRAM to identify children at
high risk of hospitalization early in the ED course. For a future trial to be relevant to both prior
trial results and to current clinical practice, we must use a respiratory score such as PRAM as
inclusion criteria and as a mark of respiratory status to allow repeated measurement in every patient,
comparison of respiratory status between arms, and to facilitate clinical translation of results.
Though children four years old or younger are often excluded out of concern that their respiratory
distress is of a different phenotype than asthma, this age group accounts for more than half of
children treated and hospitalized with a primary diagnosis of asthma57 and for more than 30% of
children who currently receive IVMg in clinical use.22 The high burden of hospitalization and
widespread use of IVMg in young children gives weight to the importance of studying IVMg in this
age group. We will separately examine the PD response of children 2–4 years old in exploratory
subgroup analysis to guide planning for the larger trial.
Table 2: Pediatric Respiratory Assessment Measure (PRAM)
score
suprasternal
retractions
scalene muscle
contraction
air entry
wheezing
O2
saturation
0
absent
absent
normal
absent
≥95%
1
decreased at bases
expiratory only
92–94%
2
present
present
widespread
decrease
inspiratory and expiratory
<92%
3
absent/minimal
audible w/o stethoscope or
silent chest w/minimal air entry
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3
Subject Eligibility, Accrual and Study Duration
3.1
Eligibility Criteria
Eligible participants will be identified by on-site study staff.
Inclusion criteria are:
1. 2–17 years old
2. Emergency Severity Index (ESI) Triage acuity of 1 or 2
3. Albuterol ordered to be administered in ED
4. A prior physician diagnosis of asthma confirmed by a licensed independent practitioner (ED
attending, fellow physician, nurse practitioner or physician assistant) in the ED who has
spoken with the patient and family and reviewed the medical record
5. Severe acute asthma, defined as a PRAM score of 7 or greater as assessed by a treating
physician at the time of screening using the study scoring instrument
Exclusion criteria are:
1. Positive pregnancy test in females of child-bearing potential (performed in all potential
participants 12 years and older) or known pregnancy (by patient or parent report)
2. Age-adjusted hypotension at presentation using age-based Pediatric Advanced Life Support
parameters (children >1 year to 10 years, SBP<(70 + 2 × age in years); >10 years, SBP < 90
mmHg)71
3. Application of assisted ventilation before enrollment assessment (intubated, bi-level positive
airway pressure, continuous positive airway pressure)
4. Received IVMg within 24 hours prior to screening (by parent or patient report or medical
record review)
5. Enrollment assessment is ≥60 minutes after the start of ED treatment (start of first albuterol
treatment)
6. Previous enrollment in the same trial (by research coordinator review of trial records)
7. Known severe renal impairment (by parent or patient report)
3.2
Subject Accrual and Study Duration
Patients will be identified and recruited in three PECARN sites, with a goal of one patient per site
per week. We plan to enroll 90 patients total in the pilot trial over 7 months of enrollment.
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Table 3: Study Timeline
Activity
Study Year 1
Study Year 2
Month
Month
1 2 3 4 5 6 7 8 9 10 11 12 1 2 3 4 5 6 7 8 9 10 11 12
Hire/train site clinical research coordinates
◆◆◆◆
Finalize protocol and manual of operations
◆◆◆◆◆◆
Completion of reliance agreements for central IRB
◆◆◆◆
Submission to IRBs at all sites
◆◆◆◆
Approval of IRBs at all sites
◆
Training meeting – site PIs/coordinators
◆
Monthly conference calls with all sites
◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆
Patient enrollment
◆◆◆◆◆◆◆
Data analysis/manuscript preparation
◆◆◆◆◆◆◆◆◆
Planning for subsequent trial
◆◆◆◆
4
Overall Study Design
The study design for this pilot trial mirrors the design that we expect to use in the larger, conclusive
trial. The future trial will be powered to evaluate the effect of bolus IVMg on hospitalization and
will be conducted at more sites, while the pilot trial is designed to demonstrate feasibility and collect
safety and pharmacologic data needed to optimize the design of the future trial. The pilot trial will
be a prospective double-blind placebo-controlled trial of children 2–17 years of age with severe
acute asthma at three PECARN sites: PCH, CHOP, and NCH. Children will be randomized to
one of three arms. University of California Davis will function as the research laboratory for the
duration of this study.
5
Study Procedures and Data Collection
5.1
Screening Schedule
Research staff will identify children who present to the emergency department with acute asthma
during screening hours maintained by each study site.
5.2
Screening and Enrollment
Research staff will identify children within the study age range who are ordered to receive inhaled
albuterol and are triaged at an Emergency Severity Index (ESI) acuity of 1 or 2. They will approach
the treating physician to determine if the child is being treated for asthma, and if any exclusions
apply (Figure 2). If no exclusions apply, the research coordinator will introduce the study to
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the patient and family, and the physician will examine the child and complete an asthma scoring
instrument that provides the PRAM score. If the PRAM score is 7 or greater, the coordinator will
approach the family for consent (including child assent and parental permission) and enrollment.
We will prepare consent documents in Spanish and English, but will include patients whose primary
language (or the language of their guardian) is not English or Spanish if a professional interpreter
can communicate the content of consent documents to the family and discuss study consent. During
the consent process, the child will receive standard asthma treatment according to study protocol.
Females 12 years and older will provide a blood or urine sample for qualitative pregnancy testing
and will be excluded from receiving study drug if positive. Clinical staff will report pregnancy
results to patients and family following institutional policies and state regulations.
5.3
Randomization
The investigational pharmacy at each institution will prepare doses in a manner to maintain allocation
concealment for all ED staff (see 5.4.2). A sequential randomization scheme with random-sized
blocks stratified by each site will be prepared in advance by a study statistician. After informed
consent is completed, pharmacy staff will deliver the assigned dose for administration. We will
consider a subject to be enrolled when the earlier of two possible events occurs: the REDCap
randomization module is invoked to generate a randomization code for the patient, which code is to
be relayed to the pharmacy, or the pharmacy dispenses a study drug dose based on the sequential
randomization scheme. Nursing staff will administer the dose regardless of the time since initiation
of treatment.
5.4
Study Drug Administration
5.4.1
Acquisition
The specific study agent to be used in this pilot trial is Magnesium Sulfate in Water for Injection,
a sterile, nonpyrogenic solution of magnesium sulfate heptahydrate in water. Study agent will
be acquired by each hospital’s research pharmacy from a common manufacturer as a solution of
magnesium sulfate in water at 80 mg/mL. This agent is the commercially available preparation of
IVMg manufactured by a common manufacturer and will be shipped directly to each study hospital
pharmacy.
5.4.2
Preparation, Storage & Labeling
Doses for each IVMg arm will be prepared in identical manner, by drawing a specified volume
of IVMg from the commercial container using sterile technique and mixing in a syringe or a
polyvinylchloride container with a specified volume of sterile water. For the 50 mg/kg arm, this
will be accomplished by mixing 25 mL of IVMg (80 mg/mL) with 15 mL of sterile water for a final
concentration of 50 mg/mL and volume of 40 mL. For the 75 mg/kg arm, this will be accomplished
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by mixing 37.5 mL of IVMg (80 mg/mL) with 2.5 mL of sterile water for a final concentration of
75 mg/mL and volume of 40 mL. For the placebo arm, 40 mL of 0.9% sodium chloride solution
will be drawn into a polyvinylchloride container identical in appearance to the containers used for
the IVMg arms.
Each prepared dose will be labeled according to the sequential randomization scheme and stored
according to local pharmacy procedure. Either the pharmacist will draw equivolumetric dosages (1
mL/kg, with max of 40 mL) from the prepared vials, or the pharmacist will deliver the full dose to
bedside study team with instructions for the volume to be delivered.
5.4.3
Dosing Schedule
After randomization the institutional pharmacist will draw equivolumetric dosages (1 mL/kg, with
max of 40 mL) from prepared vials. Enrolled subjects will be randomized to one of three arms:
• IVMg 75 mg/kg arm: 75 mg/kg (max 3 gm) infused over 20 minutes through a peripheral IV
catheter
• IVMg 50 mg/kg arm: 50 mg/kg (max 2 gm) infused over 20 minutes through a peripheral IV
catheter
• Placebo arm: 1 mL/kg (max 40 ml) of normal saline over 20 minutes through a peripheral IV
catheter
5.4.4
Dose Modification for Potential Toxicity
Clinicians will not administer IVMg to enrolled subjects outside of the study protocol until study
outcomes have been determined 2 hours after the start of the infusion. The half-life of IVMg is
approximately 2 hours.49 Repeated-dose protocols in an ICU setting that gave as much as 125 mg/kg
IVMg to children with asthma over two hours produced no hypotension or other serious adverse
effects.47 Because of this margin of safety, open-label IVMg 50 mg/kg can be administered safely 2
hours after the study infusion under strict study monitoring protocols without need for unblinding.
5.4.5
Accountability
The pharmacy will be responsible for recording the arm to which the child was randomized. Per
local procedure, the pharmacist, clinician or other study staff member will be responsible to verify a
weight for the patient and negative pregnancy test, if applicable. The patients clinical nurse will be
responsible to record the time that the study infusion started and ended.
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5.4.6
Unblinding Procedures
If a patient’s asthma deteriorates before 2 hours, clinicians should assume that the subject received
the highest dose of active study drug and can give IVMg at a dose as high as 50 mg/kg open label
as soon as 120 minutes after the start of initial study infusion without unblinding, which would
result in a maximum of 125 mg/kg over two hours if the patient was in the 75 mg/kg arm. Other
interventions can be given as needed in response to patient condition. If unblinding is considered
necessary, allocation information can be obtained from the site pharmacist and unblinding will be
considered a study protocol violation.
5.4.7
Discontinuation of Study Drug
If hypotension is measured and perfusion is impaired (see C5. Data Collection), study infusion will
be stopped, clinicians will give a 20 mL/kg bolus (max 1 L) of isotonic IV fluid, and may provide
other interventions at the clinician’s discretion. If perfusion is normal, study drug infusion will
continue.
5.5
Withdrawal from Study
Subjects will be observed in the ED for a minimum of 2 hours after the start of study infusion
unless they require transfer to the ICU due to escalation of therapy. Parents will be able to withdraw
permission for their children to continue in the study at any time. If a parent or child chooses to
not continue in the study, infusion of study drug will be stopped. The patient will be followed for
adverse events and other symptoms as described in Section 10.3.
6
Data Collection
6.1
Baseline Data
The research coordinator who approaches the patient for enrollment will gather baseline information
from the caregiver including age, sex, race and ethnicity, chronic asthma control status and medi-
cations, treatments received for the current illness prior to ED presentation, and chronic medical
conditions (Table 3). The coordinator will collect data from the treating ED team including the
following items. Scoring: The treating physician will complete a clinical asthma scoring instrument
immediately before, 20–40 minutes after, and 2 hours after the start of study infusion, each taking
approximately 60 seconds to complete. Blood samples will be drawn by clinical staff through the
IV before, then using PIVO 20–40 minutes and using PIVO 90–150 minutes after start of study
infusion, or if the blood draw is not possible using PIVO, through the existing peripheral IV. The
samples will be processed locally and then shipped to the research lab. University of California
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Davis will function as the research lab for this project. Blood pressure will be measured by the
study staff using an automated device just before the start of study infusion (within 10 minutes
prior to start of infusion), every 10 minutes (± 4 minutes) for 90 minutes following the start of
infusion, and once more 2 hours (± 10 minutes) after the start of study infusion. Perfusion: If
age-adjusted hypotension is detected, a treating clinician, which could be the treating nurse, will
complete a standardized assessment of perfusion that is then reviewed with the coordinator. If
perfusion is impaired during study drug infusion, study drug infusion will be stopped. Timing:
The coordinator will record timepoints of screening, identification, consent, and randomization,
as well as times of infusion and blood draws using the nurse’s documentation. Disposition: The
coordinator will approach the treating physician 2 hours after the start of study infusion and collect
the stated disposition for the patient (hospitalization, discharge home, or uncertain), at which point
study procedures will be finished for the ED visit.
Figure 1: Schedule of Activities
6.2
Follow-up Assessment(s)
For patients discharged home study staff will call or text the family in 12–48 hours and in one week
(5–10 days) to determine if they returned to any ED and the outcomes of the return visit, and to
assess for AEs (see Table 3). All data points will be initially recorded on paper forms, securely
stored, then entered into an electronic study database created by the Data Coordinating Center.
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6.3
Medical Record Review
Study staff will review electronic medical records of all subjects one week after enrollment to
determine the actual patient disposition and hospital course (see C6. Outcomes).
6.4
Instruments
The PRAM is outlined in Table 2 in Section 2.4.
7
Data Analysis
7.1
Specific Aim Analyses
Specific Aim 1. Demonstrate the feasibility of enrolling children in the ED with severe acute
asthma in a multicenter, randomized, controlled trial of placebo, low-dose IVMg, or high-
dose IVMg.
Conducting a pilot trial will help standardize and streamline enrollment across sites, minimize the
number of patient enrollments needed for our aims, and inform the planning of the future trial.
Primary study hypothesis: We will identify, consent, and enroll 90 patients in 7 months or less.
Our experience with prior trials within PECARN suggests a 7-month enrollment period is adequate
to reach a stable rate of enrollment and demonstrate trial procedures. Because the future large
RCT will need multiple sites for adequate enrollment, the pilot trial will test trial procedures at
three sites with various patient volumes, research infrastructures, and patient populations. Based on
applying the projected 8% of asthma visits in the PECARN Registry that would qualify based on
prior volumes at study sites, we anticipate that approximately 360 patients will qualify for the study
during the 7-month study period, allowing for study completion even if only 25% of qualifying
patients are enrolled. The study will end once 90 patients are enrolled, even if this occurs in less
than 7 months, but enrollment will not extend beyond 9 months even if fewer than 90 patients are
enrolled. This enrollment rate would be sufficient to conduct a trial powered to detect a difference
in hospitalization in 23 months. A slower rate would prompt adjustment of future trial length.
Specific Aim 2. Demonstrate the feasibility of timely delivery of study medication to enrolled
patients and assessment of blood pressure and associated adverse events in a standardized
protocol.
Our first objective in this aim is to assess our ability to administer study drug within 90 minutes after
the start of asthma treatment. Timely delivery of study drug will be considered feasible with current
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study procedures if 90% of study subjects receive study medication within this timeframe, giving
time for study intervention to affect hospitalization, making hospitalization an outcome appropriate
for the future trial. Delivery of study drug to less than 90% of study subjects will indicate a need
to further refine study procedures prior to the larger trial. We will optimize delivery of study drug
in the future trial by analyzing the impact of factors in the pilot trial that may influence study
drug delivery including protocol adherence, variability in clinical care, time of day, ED volumes,
research coordinator availability, pharmacy processes, consent processes, and parental availability.
Factors associated with time to first study drug administration, administratively censored at 180
minutes, will be explored using Cox proportional hazards modeling. The Cox models are intended
to identify features requiring additional planning to promote timely delivery rather than to find
statistical significance.
Our second objective in this aim is to inform a monitoring plan for the future trial that is focused,
clinically feasible, and effectively protects patient safety. We will intensively monitor blood pressure
during the pilot trial for 90 minutes after the start of study drug infusion (see Data Collection) and
will record all adverse events throughout the study period. We will consider the procedures of the
pilot trial feasible for the larger trial if we can collect ≥90% of planned data points related to blood
pressure. This will indicate that this data gathering does not pose an undue burden on the teams
providing clinical care to study patients. We will use the degree to which data points are collected
in coordination with the frequency and timing of blood pressure changes, the frequency and degree
of age-adjusted hypotension and poor perfusion, interventions delivered to patients with measured
hypotension, and other recorded adverse effects to devise a monitoring plan that would capture all
adverse events and is maximally feasible.
Specific Aim 3. Externally validate a previously constructed PK model and develop a combined
PK/PD model for IVMg using magnesium (total and ionized) serum concentrations and their
correlation with measures of safety and respiratory distress in children with asthma.
We will use these data to validate a PK/PD model that will guide initial dosing for the large trial.
External validation of our prior PK model requires blood samples from a minimum of 30 patients
who receive IVMg at sites outside of PCH for optimal model validation. We anticipated 40 subjects
to meet this criteria. Data from the samples collected in this study will be used to externally
validate our previously developed population PK model,34 and if needed (i.e. MPE>15% or <
−15%, MAPE>30%), update the model with this larger sample size. Concentration analysis, PK
model validation, and updating our prior PK model (if needed) will use similar approaches as
we have previously described.34 Notably, this includes accounting for endogenous magnesium
concentrations (Equation (1)) assumed to be at steady-state prior to IVMg administration.
Cendogenous,ind = Cendogenous,pop × EXP(ETA(j))
Ctotal = Cexogneous + Cendogenous,ind
(1)
Cobserved = Ctotal + ERR(i)
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PE = Cpred −Cobs
Cobs
(2)
APE = |Cpred −Cobs|
Cobs
(3)
Once the PK model has been confirmed, we will incorporate PRAM scores and other measures of
respiratory distress to develop a population PK/PD model. PK/PD modeling will utilize NONMEM®
software (v7.3, ICON Development Software, Ellicott City, MD, USA). The first-order conditional
estimation with interaction (FOCE-I) method will be used throughout model building and evaluation.
Model selection will be based on parsimony, objective function value (OFV), and visual diagnostic
plots. Direct and indirect approaches for incorporating PD will be tested. After determining the base
model, covariates will be tested for impact on PD using a forward inclusion (p < 0.05) backwards
exclusion (p < 0.01) method. Covariates will be added to the model in a stepwise fashion, and
allowed to remain in the model if covariate inclusion decreased the OFV by at least 3.84 and its
exclusion increased the OFV by at least 6.63. Once the final PK/PD model is determined, we
will evaluate model accuracy and robustness through bootstrapping methods and visual predictive
checks.
The PK/PD model will be used to define Mg concentrations associated with adverse effects in-
cluding hypotension, and patient outcomes including reduction in PRAM during treatment and
hospitalization. Dose-exposure-response data simulated (n = 1000 datasets) from the PK/PD model
will be used to select doses used in the future large trial. Specifically, we will use the simulated
datasets to determine the dose at which 10% of participants are expected to have adverse effects (i.e.
hypotension), to establish an upper limit of dosing for the future trial. Importantly, this analysis will
allow us to evaluate the role of an upper dose limit (i.e. the 2 or 3 gm maximum dose, regardless
of patient weight) on preventing hypotension. Similarly, we will use the simulated PK/PD data to
define doses expected to yield 20, 40, and 60% reductions in PRAM/hospitalization. We will target
the use of these doses in the future study as doses expected to maximally reduce hospitalization in
the future trial.
If we are unable to build a robust population PK/PD model using NONMEM®, we will evaluate
correlations between PK and PD using Pearson Rho correlation analyses in GraphPad Prism v6.05
software. In this scenario, the population PK model will be utilized to identify doses that generate
simulated concentration data within the target therapeutic range established by the correlation
analyses.
Approximately one fourth of children receiving IVMg for asthma weigh more than 40 kg, the weight
at which a 2 gm or 3 gm dose is reached (Registry). As a result of this maximum, approximately
one half of children weighing more than 40 kg receive less than 30 mg/kg IVMg. As a drug that
exhibits first-order kinetics, delivering IVMg with an arbitrary maximum may reduce the benefit
of the drug in a substantial portion of children. We will use the newly developed PD model and
validated PK model to determine if patients above 40 kg have less improvement in clinical score,
and if any associations found are related to changes in serum values.
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7.2
Sample Size Calculations and Statistical Power
Sample size for this pilot trial is driven by the first aim, which is to demonstrate ability to enroll
children severely ill with asthma in a randomized controlled trial. The second aim is focused on the
feasibility of study drug delivery and the collection of safety data, and the third aim is focused on
pharmacologic modeling for dose estimation to be used in the large trial to follow this pilot trial. All
three aims of the pilot trial are focused on generating data to inform the structure of the larger trial
to follow, and accordingly they do not have sample size calculations or have associated calculations
of statistical power.
7.3
Other relevant statistical topics...
Sample size estimations of the Future Trial
The future trial is designed to have up to two
chances to find a significant reduction in hospitalization: the test of lower dose vs. placebo may be
significant, and if this first test is not significant then higher dose vs. placebo will be tested and may
be significant. The overall one-sided type I error rate is controlled at 0.025 by conducting each test
at a one-sided alpha of 0.0125. The following table shows approximate sample sizes with observed
outcomes needed to achieve 80% power. The sample sizes are such that the higher dose of IVMg
has 3/8 of the overall sample, and the lower dose of IVMg will have 3/8 or 2/8 of the sample (3/8 if
superiority to placebo is demonstrated, 2/8 otherwise) with the balance in the placebo arm (2/8 or
3/8 of the sample). To account for missingness in the hospitalization outcome, a reasonably accurate
approximation is to divide the sample size by the expected proportion of nonmissing outcomes
(e.g., with 7% missingness, the 0.5 IVMg, 0.6 Placebo cell suggests enrolling 1032/.93 ≈1110
participants).
Approximate observed sample size to have 80% power that at least one IVMg arm lowers the
probability of hospitalization. To adjust for missingness, divide by (1−[expected proportion of
missing values]).
Approximate # with nonmissing
Probability of Hospitalization for Placebo arm
outcome to yield 80% power
0.6
0.7
0.8
Probability of
0.4
256
120
64
hospitalization
0.5
1032
248
104
for each IVMg
0.6
–
944
216
arm
0.7
–
–
776
The following table has the same framework but was created to yield 90% power:
Approximate # with nonmissing
Probability of Hospitalization for Placebo arm
outcome to yield 90% power
0.6
0.7
0.8
Probability of
0.4
336
152
80
hospitalization
0.5
1360
336
136
for each IVMg
0.6
–
1240
288
arm
0.7
–
–
1024
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8
Data Management
8.1
Clinical Site Data Management
Each clinical site will maintain study records in secure locations that may include password protected
electronic files or locked filing cabinets. The site will maintain an Essential Documents Binder,
which may be in paper or electronic form. Copies of all informed consent documents will be kept
on file and be available for site monitoring inspection (on site or remote).
8.2
Data Coordinating Center
8.2.1
Data Center Description
Overview
The Data Coordinating Center (DCC) in the Department of Pediatrics at the University
of Utah School of Medicine provides data coordination and management services for a variety of
national research networks. Anchoring these services is a state-of-the-art, energy efficient data
center. The data center facility supports more than 3500 users around the country and provides
a secure, reliable, enterprise-wide infrastructure for delivering mission critical DCC systems and
services.
Facility, Hardware, Storage, Data Backup and System Availability
The data center was built
using industry standards and energy efficient cooling solutions. The data center is cooled by Liquid
Cooling Package (LCP) inline cooling technology, providing the desired efficiency, redundancy
and the modularity. The LCP utilizes a hot/cold aisle design that allows for even air distribution
to minimize hot spots. The data centers electrical power system contains an uninterruptible power
supply (UPS) with a diesel backup generator. The data center is protected with an FM-200 backed
fire suppression system, which provides waterless fire suppression without leaving behind residue
or particulate. Enhanced security measures are implemented to safeguard the equipment and the
data within in it. Security measures are enforced 24 hours a day, 7 days a week, 365 days a year by
a combination of on-premise security guards, University police officers and video surveillance.
The data center has a virtualized environment. This environment consists of more than 415 virtual
servers across 25 host servers. Virtualization provides key advantages: High availability (HA) – in
the event of hardware failure, virtual machines (VM) automatically restart on healthy resources,
minimizing impact to end-users; Flexible infrastructure - compute and storage is seamlessly scaled
as current needs change; Rapid deployment - new resources are provisioned on-demand.
Production servers running mission critical applications are clustered and configured for failover
events across multiple clusters. Entire servers are backed-up to a dedicated infrastructure. The
backup repositories are encrypted-at-rest using AES-256. The storage area networking (SAN)
applications, clusters, and switch-to-switch links are highly redundant. Incremental backups of data
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occur Monday through Friday. A full data backup occurs weekly. Full backups are sent off-site on a
weekly basis to a secure secondary location. The data center currently manages over 125 terabytes
(TB) of data.
Information systems are available 24/7/365 unless a scheduled maintenance period or mitigation of
an unexpected event is required.
8.2.2
Security, Support, Encryption, and Confidentiality
The data center coordinates the network infrastructure and security with University Information
Technology (UIT) at the University of Utah. This provides us with robust firewall hardware,
automatic network intrusion detection, and the expertise of dedicated security experts working at
the University. Centralized authentication and communication over public networks are encrypted
using transport layer security (TLS) and/or virtual private network (VPN) technologies. Direct
access to data center machines is only available while physically on premise or via a VPN client.
All network traffic is monitored for intrusion attempts. Security scans are regularly run against data
center servers and IT staff are notified of intrusion alerts. Security is maintained with Windows
user/group domain-level security. Users are required to change their passwords every 90 days. All
files are protected at user/group levels and database security is handled in a similar manner with
group-level access to databases, tables, and views. Finally, all laptops used by faculty and staff in
the DCC are whole-disk encrypted.
The data center uses monitoring tools to continuously monitor applications and servers. Environ-
mental and network systems are also monitored to ensure up-time. System Administrators are
on-call 24/7/365 to respond to urgent events.
All personnel involved with the DCC have signed confidentiality agreements concerning data
encountered in the course of their daily work. All personnel (including administrative staff)
have received Human Subjects Protection and Health Information Portability and Accountability
Act (HIPAA) education. We require all users to sign specific agreements concerning security,
confidentiality, and use of our information systems before access is provided.
8.3
Electronic Data Capture System
The Data Coordinating Center (DCC) will develop an electronic data capture system for this trial.
Currently the DCC uses multiple applications, such as OpenClinica or REDCap, and will elect to
use the most appropriate application at the time of implementation of the study. Data will be entered
by each clinical site.
The DCC will use an electronic discrepancy management system to notify sites of inconsistent or
erroneous data entry, which will be corrected by the clinical site. The discrepancy management
system maintains an audit trail of all discrepancy resolution.
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8.4
Study Monitoring
The investigators recognize the importance of ensuring data of excellent quality. Study monitoring
is critical to this process. Monitoring has been a very effective tool for maintaining data quality
in previous Pediatric Emergency Care Applied Research Network studies, and we will utilize
this process to ensure excellent quality data in the proposed study. The DCC utilizes risk-based
methodology to identify and correct problems that may arise at sites. The risk-based approach to
monitoring focuses on oversight activities and preventing or mitigating key risks to data quality, as
well as to processes critical to human subject protection and integrity of the trial or study.
Study monitors must be provided with appropriate access to study materials and the medical records
for study subjects. If the medical records are in electronic form, the clinical investigator or an
authorized individual must provide any assistance necessary to facilitate the study monitor’s review
of data in the electronic medical record.
8.4.1
Site Monitoring Plan
A supplemental study-specific risk-based monitoring plan, separate from the protocol will be
completed which outlines specific criteria for monitoring. This plan may include the number of
planned site visits, criteria for focused visits, additional visits or remote monitoring, a plan for chart
review and a follow up plan for non-compliant sites. The monitoring plan also describes the type of
monitoring that will take place (e.g., sample of all subjects within a site; key data or all data), the
schedule of visits, how they are reported and a time frame to resolve any issues found.
8.4.2
Clinical Site Monitoring
Site monitoring visits will be performed by a trained site monitor during the study period to
ensure regulatory compliance, patient safety, and to monitor the quality of data collected. Essential
document binders, regulatory documents and data collection forms may be reviewed. Interim visits
will take place depending on grant budget, site enrollment, and compliance issues identified. The
site monitor will provide each site with a written report, and sites will be required to follow up
on any deficiencies. It is anticipated that the study monitoring visits for this protocol will consist
of a site initiation visit (prior to patient enrollment), interim visits, and a close out visit. The site
initiation may take place as group training made up of site investigators and research assistants.
8.4.3
Remote Monitoring
The Data Coordinating Center may supplement on-site monitoring with remote monitoring activi-
ties. Remote monitoring involves detailed review of the data entered by the Clinical Center and
consultations with the Clinical Center investigator and/or research coordinator to review safety and
data quality. This may require uploading copies of medical records, patient study files, regulatory
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documentation, or other source documents for the monitor to review. Alternatively, other methods,
such as remotely viewing source documentation, may be utilized. This helps assure protocol
compliance and accurate data collection. The Data Coordinating Center may conduct more remote
monitoring activities early in the trial to assure protocol compliance and identify any training
issues that may exist. Remote monitoring documents will be retained in accordance with federal
requirements. Safety of subjects will be monitored and ensured in accordance with the Data and
Safety Monitoring Board (DSMB) plan.
8.4.4
Pharmacy Monitoring
The Clinical Center pharmacy must maintain adequate records of all dispensed study drug. Each
pharmacy will be monitored and may be requested to send copies of these documents to the Data
Coordinating Center. Since this study will use a central pharmacy, that pharmacy must also maintain
adequate records and will also be monitored.
8.5
Record Access
The medical record and study files (including informed consent, permission, and assent documents)
must be made available to authorized representatives of the Data Coordinating Center, upon request,
for source verification of study documentation. In addition, medical information and data generated
by this study must be available for inspection upon request by representatives (when applicable) of
the Food and Drug Administration (FDA), NIH, other Federal funders or study sponsors, and the
Institutional Review Board (IRB) for each study site.
9
Protection of Human Subjects
9.1
Institutional Review Board (IRB) Approval
A Single IRB (SIRB) will be used for this study. The University of Utah IRB will serve as the
IRB of record. Study sites will rely on the University of Utah IRB to act as central IRB. The Data
Coordinating Center and each clinical center must obtain IRB approval prior to participating in the
study.
The Data Coordinating Center will track IRB approval status at all participating centers and will
not permit participant enrollment without documentation of initial SIRB approval and local review
sign-off. The Data Coordinating Center will also track the maintenance of that approval throughout
subsequent years of the project.
The Data Coordinating Center and each clinical center must obtain IRB approval prior to participat-
ing in the study. A Central IRB (CIRB) will be used for this study. The University of Utah IRB will
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serve as the IRB of record.
The Data Coordinating Center will track IRB approval status at all participating centers and will
not permit subject enrollment without documentation of initial SIRB approval and local review
sign-off. The Data Coordinating Center will also track the maintenance of that approval throughout
subsequent years of the project.
9.2
Informed Consent
We will seek a waiver of authorization for screening and recruitment only to allow the review
of patient’s medical problems and treatments being provided prior to approaching patients for
enrollment. All other research activities will be performed with parental authorization and patient
assent (when applicable). Written documentation of informed consent from the patient’s parent or
guardian will be obtained as soon as possible in the Emergency Department at the bedside. For
females 12 years and older being considered for enrollment, we will include consent for a screening
pregnancy test as part of the consent process, and test blood or urine for pregnancy only once
consent is complete. Under Food and Drug Administration (FDA) Regulation 21 CFR 50.55, where
clinical investigations are more than minimal risk but presenting the prospect of direct benefit to
individual subjects (50.52) and permission is to be obtained from guardians, permission of one
guardian is sufficient. Under FDA Regulation 21 CFR 50.55 we will also solicit the assent of older
children to participate in research as directed by the site IRB. The clinical research coordinator
or study investigator will complete the capacity for assent assessment. If the child is determined
to have capacity, assent for participation will be sought and documented appropriately. If at any
time during the consent process a prospective subject who is determined to have capacity or their
parent or guardian indicates that they do not want the child to be enrolled in the research study, the
research team will cease proceeding with the protocol. If both parents or legal guardians arrive
with the child and there is a disagreement between the parents about whether or not to enroll
the child, the child will not be enrolled into the research study. For Spanish speaking patients or
guardians, we will utilize hospital medical interpreting services in the consent process to address
any questions or concerns that a Spanish-speaking guardian may have. A Spanish version of the
consent document will be created and provided. For patients or accompanying guardians who do
not speak English or Spanish, we will pursue consent if a professional interpreter is available by
phone or videoconference service in the preferred language.
9.3
Potential Risks
Administration of IVMg requires placement of a peripheral intravenous (IV) line, which carries the
risk of pain at the insertion site (common), infection, phlebitis, thrombophlebitis, emboli, hematoma,
extravasation, and needlestick injuries (all less common). The short duration of the use of the IV
line used for IVMg (2 hours for study procedures, median 2 days in usual clinical care) minimizes
the risk of complications. Blood samples will be drawn directly through the IV at IV placement
and through the peripheral IV using a PIVO catheter (manufactured by BD Medical) both 20–40
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minutes after the start of study infusion and 90–150 minutes after study infusion. Total blood drawn
will not exceed 5 mL, a volume of blood loss that presents no foreseeable risk to participants.
Though IVMg is approved for use in late pregnancy to prevent and treat seizures in the setting
of preeclampsia and eclampsia, it is unknown how it affects pregnancy when given for asthma,
especially at other points in the pregnancy. For this reason, we will not include any patients who are
pregnant. A pregnancy test will be done in all females 12 years and older who are not already known
to be ineligible and who consent to this study procedure. The pregnancy test must be negative to
participate in this study.
The administration of IVMg includes the risk of physical effects from IVMg which range from
mild (diarrhea, nausea, stomach cramping, facial flushing, change in blood pressure) to more severe
(hypotension with poor perfusion, urinary retention, lethargy, apnea, or irregular heartbeat). The
incidence of hypotension in children after IVMg in the ED for asthma ranges from 6.8% in a
retrospective review of 6,497 children across 7 sites22 to 11% in an abstract of clinical care delivered
to 100 children at a single site.36 Interventions for hypotension were limited to a fluid bolus and no
subjects had persistent hypotension requiring intervention after ED treatment.
The incidence of poor perfusion in children who experience hypotension after IVMg is unknown.
Other effects of IVMg infusion have been described in other medical conditions including diarrhea,
nausea, stomach cramping, facial flushing, change in blood pressure, urinary retention, lethargy,
apnea, or irregular heartbeat, but their incidence has not been described in children given IVMg for
asthma.
Subjects will be observed in the ED for a minimum of 2 hours after study infusion unless they
require transfer to the ICU due to escalation of therapy. We will record the physicians stated
disposition for the patient (hospitalization or discharge home) 2 hours after receiving study infusion.
For all patients we will review electronic medical records one week later to determine the actual
patient disposition, length of ED and hospital stay, ICU admission and length of stay, intubation,
and any assisted ventilation. For patients discharged home we will call the family 12–48 hours after
discharge from the ED and in 5–10 days to determine if they returned to any ED and the outcomes
of the return visit, and to assess for AEs. All other risks in the study are related to the privacy
of protected clinical information gathered during ED treatment, in chart review, and in followup
contact with the family.
9.4
Protections Against Potential Risks
All children enrolled in this study are being cared for in the emergency departments of tertiary
pediatric hospitals by physicians with subspecialty training in pediatric critical care using evidence-
based protocols in coordination with nurses with pediatric training and experience. All children
enrolled will receive standard-of-care asthma treatment throughout the study. The study intervention
is in addition to current standard-of-care. Monitoring planned for the study mirrors routine clinical
monitoring guidelines and standards for critically ill patients.
Adverse events will be monitored closely during the ED visit through standard clinical monitoring
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for critically ill children as well as blood pressure measurement every 10 minutes (± 4 minutes)
for 90 minutes after the start of IVMg infusion. If age-adjusted hypotension is detected, a treating
clinician, which could be a nurse, will complete a standardized assessment of perfusion that is
then reviewed with the coordinator. If perfusion is impaired during study drug infusion, study drug
infusion will be stopped. Clinicians will give a 20 mL/kg bolus (max 1 L) of isotonic IV fluid, and
may provide other interventions at the clinicians discretion.
If patients experience hypotension and poor perfusion, all study sites have experience and current
capability to administer IV fluid boluses and other interventions as clinically indicated. All facilities
have Pediatric Intensive Care Units should enrolled child require further critical care, including
supported ventilation or other interventions as clinically indicated. All patients not eligible for the
study or who withdraw from the study will continue to receive standard-of-care treatment at the
discretion of the attending clinical team. Blood or urine pregnancy test results will be reported to
the subject and the parent or legally authorized representative signing the consent for screening
according to institutional policies and state regulations. The study participants contact information
will be securely stored at each clinical site for internal use during the study. At the end of the study,
all records will continue to be kept in a secure location for as long a period as dictated by local IRB
and Institutional regulations. Study participant research data, which is for purposes of statistical
analysis and scientific reporting, will be transmitted to and stored at the PECARN Data Coordinating
Center (DCC). This will not include the participants name. Rather, individual participants and
their research data will be identified by a unique study identification number. The study data entry
and study management systems used by clinical sites and by PECARN DCC research staff will be
secured and password protected. At the end of the study, a de-identified database will be prepared
and archived at the PECARN DCC and provided for public use as specified in the PECARN standard
operating procedures and, if applicable, NIH requirements.
9.5
Potential Benefits
Enrolled subjects may benefit directly in this study by receiving IVMg, which may reduce their
risk of hospitalization and improve asthma symptoms. These benefits may be possible even in
patients who do not improve with treatment including standard asthma medications. Children
who are randomized to receive placebo also receive current standard asthma therapy. Findings
of the trial will be used to inform the treatment of children with asthma treated in Emergency
Departments, which could help deliver better treatment that avoids hospitalization, or could help
avoid unnecessary treatment or excessive monitoring.
9.6
Risk Benefit Assessment
Children are vulnerable subjects and are the primary focus of this study. Asthma is the most
common chronic illness of childhood and a leading cause of pediatric hospitalization, disability,
and healthcare-related cost.1 In 2013, acute asthma resulted in 679,643 emergency department (ED)
visits and 70,429 hospitalizations for children 2–17 years old in the United States.3 Hospitalization
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is a primary driver of direct costs in asthma in children,4 contributing $3.4 billion of the $9.3 billion
in total pediatric asthma costs estimated in 2008,58 as well as indirect costs from school absenteeism
and lost parental work.6 Prior trials of IVMg in children with asthma were too small to conclude
whether IVMg can reduce hospitalization in children with asthma. To date, these small trials of
IVMg in acute asthma have not been followed by larger conclusive trials. Comparison to placebo in
a large trial is needed to evaluate the effect of IVMg on hospitalization. Though any estimates of
the potential effects of broader use of IVMg on hospitalization rates for acute asthma are limited
by the size and number of prior trials, a recent meta-analysis of previous small trials suggests that
IVMg given in the ED may reduce hospitalization in children by 30%. Applying a 30% reduction
in hospitalization to the remaining hospitalized children who do not receive IVMg in the US could
potentially avoid 16,500 hospitalizations each year, each at an average cost of $3,600, producing
direct cost savings of $65 million yearly in addition to avoiding indirect costs of missed school and
work.
As outlined in Section 9.3, risks of IVMg have been described in prior literature but not sufficiently
to dismiss them as minor. This study will help ensure that monitoring for children enrolled in future
trials is feasible and complete.
Considering the potential benefits and the anticipated risks, the research outlined in this proposal
will provide important evidence to guide the care of children with asthma. By clarifying the efficacy,
safety, and dose of IVMg for children with asthma, these results will influence the care provided to
severely ill children with asthma nationally and globally through inclusion in NHLBI guidelines
and other guidelines such as those developed by the Global Initiative for Asthma.
10
Data and Safety Monitoring Plan
10.1
Data Safety Monitoring Board (DSMB)
Assuring patient safety is a central and an essential component of this protocol. Each clinician
caring for a study patient has primary responsibility for the safety of individual subjects under
his/her care. A DSMB will be established prior to the initiation of enrollment. The DSMB will
consist of at least three members. At least one of these individuals will have statistical expertise and
at least one of these individuals will have experience in emergency medicine. All individuals will
have experience in the conduct of randomized clinical trials and will not have direct association
with the sites to be included in the trial nor have other conflicts of interest that would interfere with
their objectivity. Because this pilot trial is structured to evaluate the adequacy of trial procedures
and will not be powered to fully evaluate efficacy or safety, we do not anticipate having sufficient
interim data during the trial for the DSMB to reach conclusions regarding efficacy or safety, though
safety data will be considered in interim analysis.
The DSMB will be responsible for:
1. Approval of the final study design;
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2. Reviewing and analyzing the progress of the study;
3. Monitoring the safety of the study treatments (as outlined below);
4. Reviewing reports of data quality.
The unblinded DCC statistical team will provide information to this committee as requested. In
the pilot trial, the DSMB will meet before the first site is activated for enrollment and again after
approximately 30 subjects have been enrolled. The DSMB or study PI have the power to request
additional meetings. The DSMB will have the power to halt the study should safety reasons exist.
10.2
Safety Monitoring
Data that will be considered in the DSMBs evaluation of safety will include the following categories:
Appropriate enrollment: Patients enrolled and later found to be ineligible.
Intervention safety: Dose of study drug prepared by pharmacy, dose and volume of study drug
delivered to patient, blood pressure measurement after study drug, perfusion assessments and
interventions in those with measured hypotension, application of assisted ventilation after study
drug, ICU admission, serum magnesium measurements after study drug, and other medication
delivered to participants for the treatment of asthma.
10.3
Adverse Event Reporting
10.3.1
Definition of Adverse Event and Serious Adverse Event
Adverse Event (AE)
is any untoward medical occurrence in a subject that occurs during the
conduct of a clinical study of a pharmaceutical product that does not necessarily have a causal
relationship to the study drug. This can, therefore, be any unfavorable and unintended physical
sign, symptom, laboratory parameter, or disease entity that develops or worsens in severity during
the course of the study, whether or not considered related to the study drug. Hypotension will be
defined as any systolic blood pressure meeting the following age-specific norms:
• Children 1–10 years: < 70 + (age in years × 2)
• Children >10 years : < 90
Measured hypotension without associated symptoms would be categorized as a mild AE; the
presence of symptoms would be categorized appropriately based on the degree of impairment of
activity.
Serious Adverse Event (SAE):
A serious adverse event (SAE) for this population is an adverse
event that:
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• results in death; or
• is life-threatening (the patient was, in the view of the site investigator, in immediate danger of
death from the event as it occurred); or
• requires inpatient hospitalization or prolongs an existing hospitalization; or
• results in persistent or significant disability or incapacity; or
• results in congenital anomaly/birth defect; or
• any other event that, based upon appropriate medical judgment, may jeopardize the subject’s
health and may require medical or surgical intervention to prevent one of the other outcomes
listed in this definition.
As stated above, the presence of hypotension with impaired perfusion is categorized as an AE and is
an indication to stop study infusion, though it may or may not be categorized as an SAE depending
on the degree of impairment of activity. Hypotension with impaired perfusion is the only specified
condition that should trigger study infusion to be stopped. Study infusion can be stopped in the
setting of other AEs as deemed appropriate by the clinical team caring for the patient.
Unanticipated Problems(UP)
We consider unanticipated problems involving risks to participants
or others to include, in general, any incident, experience, or outcome that meets all of the following
criteria:
• Unexpected in terms of nature, severity, or frequency given (a) the research procedures that
are described in the protocol-related documents, such as the IRB-approved research protocol
and informed consent document; and (b) the characteristics of the participant population
being studied;
• Related or possibly related to participation in the research (“possibly related” means there is
a reasonable possibility that the incident, experience, or outcome may have been caused by
the procedures involved in the research); and
• Suggests that the research places participants or others at a greater risk of harm (including
physical, psychological, economic, or social harm) than was previously known or recognized.
10.3.2
Classification of an Adverse Event (Relatedness, Severity, and Expectedness
Relatedness:
The suspected relationship between study interventions and any adverse event will
be determined by the site investigator using the criteria below. Relatedness must be assessed by an
investigator and may not be assessed by a research coordinator.
Not Related: The event is clearly related to other factors, such as the subject’s clinical state,
therapeutic interventions, or concomitant drugs administered to the subject.
Possibly Related: The event follows compatible temporal sequence from the time of beginning
the assigned study intervention, but could have been produced by other factors such as the
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subject’s clinical state, therapeutic interventions, or concomitant drugs administered to the
subject.
Probably Related: The event follows a reasonable temporal sequence from the time of beginning
the assigned study intervention, and cannot be reasonably explained by other factors such as
the participants clinical state, therapeutic interventions, or concomitant drugs administered to
the participant.
Severity:
The severity, which is a measure of intensity, of clinical adverse events and laboratory
abnormalities will be recorded by the site investigator and categorized. The following guidelines
will be used to describe severity.
Mild: The event requires minimal or no treatment and does not interfere with the participant’s daily
activities.
Moderate: The event results in a low level of inconvenience or concern with the therapeutic
measures. Moderate events may cause some interference with functioning.
Severe: The event interrupts a participant’s usual daily activity and may require systemic drug ther-
apy or other treatment. Severe events are usually potentially life-threatening or incapacitating.
Of note, the term “severe” does not necessarily equate to “serious”.
Expectedness of the Event:
All adverse events, including serious adverse events, will be evaluated
as to whether their occurrence was expected or unexpected. An AE will be considered unexpected
if the nature, severity, or frequency of the event is not consistent with the risk information described
for the study intervention or underlying condition.
Expected: An event is considered expected if it is known to be associated with the underlying
condition or is related to the study intervention and is mentioned in the protocol, informed
consent, or other study documents. An event may be expected despite the study subjects
clinical state immediately prior to the event.
Unexpected: An event is considered unexpected if there are no prior data linking this event with
either the condition or intervention under study or an event that occurred unexpectedly in the
course of treatment.
Treatment or Action Taken:
For each adverse event, the site investigator will record whether an
intervention was required:
• Medical or surgical procedure
• Concomitant medication: started, changed, or discontinued
• Other, specify
• No action taken
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Outcome of Event:
Finally, the site investigator will record the clinical outcome of each adverse
event as follows:
• Death
• Recovered and the patient returned to baseline status
• Recovered with permanent sequelae
• Symptoms persist
10.3.3
Data Collection Procedures for Adverse Events
Adverse events must be recorded starting from the time of randomization until the follow-up call
approximately one week after enrollment. All AEs whether or not they are considered related to the
study, shall be recorded on a Case Report Form including information characterizing the timing,
severity, relatedness, and outcome of each AE and actions taken in response to the AE. Any medical
condition present at the time of randomization, recorded in the patient’s baseline history at study
entry, which remains unchanged or improves (unless the clinician feels it is clinically relevant), will
not be recorded as an adverse event at subsequent evaluations. However, worsening of a medical
condition that was present at the time of randomization will be considered a new adverse event.
Adverse events will be coded using the MedDRA coding vocabulary. Coding will be done centrally
at the Data Coordinating Center as this requires specific training.
The Clinical Center investigator will report all serious, unexpected, and study-related adverse events
to the DCC within 24 hours. A detailed completed report will be required to be sent to the DCC
within 3 working days of the event. After receipt of the complete report, the DCC will report
such serious, unexpected, and study-related adverse events to the NHLBI in an expedited manner
according to NHLBI policy found at the following link:
https://www.nhlbi.nih.gov/grants-and-training/policies-and-guidelines/nhlb
i-adverse-event-and-unanticipated-problem-reporting-policy
In accordance with local IRB requirements, the Clinical Center investigator may be required to
report such events to the IRB in addition to notifying the DCC. In the event that the medical monitor
believes that such an event warrants emergent suspension of enrollment in the trial, and NHLBI
staff cannot be reached expeditiously, the DCC will notify the study investigator (Dr. Johnson) and
all Clinical Center investigators to cease enrollment in the trial. Resumption of enrollment will not
occur without consent of the NHLBI after discussion with the DSMB.
10.3.4
Reporting Monitoring Serious Adverse Events
A qualified physician will be designated to fulfill the function of the medical monitor for this study.
Site investigators and/or research coordinators will report serious adverse events to the DCC within
24 hours of becoming aware of the event. A detailed completed report will be required to be sent to
the DCC within 3 working days of the event, and the medical monitor will assess all serious adverse
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events reported from site investigators.
For each of these serious adverse events, the site investigator will provide sufficient medical history
and clinical details for a safety assessment to be made with regard to continuation of the trial. The
medical monitor will sign off on each SAE report after review. All SAE reports will be retained at
the DCC, and all SAE reports will be available for review by DSMB members and NHLBI staff.
The SAE reporting process may be incorporated into the Electronic Data Capture (EDC) System in
use for the study.
In accordance with local IRB requirements, the site investigator may be required to report such
events to the IRB in addition to notifying the Data Coordinating Center.
The DSMB will review all adverse events (not necessarily serious, unexpected, and study-related)
during scheduled DSMB meetings. The Data Coordinating Center will prepare a Summary Report
of Adverse Events for the DSMB meetings with the MedDRA coding system.
10.3.5
Reporting and Monitoring Unanticipated Problems (UP)
Incidents or events that meet the OHRP criteria for UPs require the creation and completion of
an UP report form. It is the site investigators responsibility to report UPs to their IRB and to the
DCC/study sponsor. The UP report will include the following information:
• Protocol identifying information: protocol title and number, PIs name, and the IRB project
number;
• A detailed description of the event, incident, experience, or outcome;
• An explanation of the basis for determining that the event, incident, experience, or outcome
represents an UP;
• A description of any changes to the protocol or other corrective actions that have been taken
or are proposed in response to the UP.
The site investigator will report unanticipated problems to the DCC within 24 hours of becoming
aware of the event. A detailed completed report will be required to be sent to the DCC within
3 working days of the event. After receipt of the complete report, the DCC will report these
unanticipated problems to the NHLBI in an expedited manner (as close to 24 hours as possible).
In accordance with local IRB requirements, the site investigator may be required to report such
unanticipated problems to the IRB in addition to notifying the Data Coordinating Center.
10.3.6
Possible Emergent Enrollment Suspension
In the event that the medical monitor believes any UP or unexpected, study-related SAE warrants
emergent suspension of enrollment in the trial, the medical monitor must immediately notify the
DCC. Attempts will be immediately made to consult NHLBI staff and the DSMB chairperson. If
they are consulted expeditiously, decisions will be made whether to continue the study without
change, and whether to convene the entire DSMB for an emergent meeting. If a decision is made
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to suspend enrollment in the trial, this will be reported to the study investigator (Dr. Johnson)
and all clinical investigators, who will be instructed to report this to their local IRB. If NHLBI
staff and the DSMB chairperson are not reached expeditiously, the DCC will notify the study
principal investigator (Dr. Johnson) and all site investigators to suspend enrollment in the trial until
the NHLBI staff and DSMB chairperson are consulted. Resumption of enrollment will not occur
without consent of the NHLBI staff after discussion with the DSMB.
10.3.7
Early Study Termination
There are no prespecified thresholds for early termination of the pilot study. The guidelines in the
previous section describe how the study could be emergently suspended for safety reasons, and if
not satisfactorily resolvable then safety concerns could naturally lead to study termination. There
are no formal interim efficacy analyses designed to terminate the study early, either for futility or
for demonstrated efficacy. In this feasibility study, poor enrollment, substandard protocol adherence,
or low rates of data collection could prompt changes to study conduct but would be anticipated to
lead to corrective actions rather than early study termination.
Note that the DSMB has the ability to halt the trial at their discretion for any reason if they deem
this appropriate.
10.3.8
Follow-up of Serious, Unexpected and Related Adverse Events
All serious, unexpected and related adverse events, that are unresolved at the time of the patient’s
termination from the study or discharge from the hospital, will be followed by the Clinical Center
investigators until the events are resolved, subject is lost to follow-up, the adverse event is otherwise
explained or has stabilized, or 12 months have passed from the time of last study dose.
10.3.9
Reporting Mechanisms for Changes or Amendments to Protocol or Consent Form
Any changes to the protocol or consent forms will be first submitted to the single IRB for approval.
Once approved, documents are deposited by the sIRB in IREx. The project manager in the DCC
will then upload them into the project-specific eRoom/eBinder maintained by the DCC for study
documents, which will make the documents available to all study personnel. Any changes to protocol
or consent documents, as well as any other changes to study procedure, will be communicated by
the project manager by email to all relevant study personnel, with further communication within
a clinical center to be performed by the site investigator and study personnel at the center, as
applicable.
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10.3.10
IND Information
Investigation of IVMg in this study is supported and supervised by the FDA through Investigational
New Drug Application (IND) #133781.
11
Study Training
A formal training program for investigators and research staff will be held prior to the start of
enrollment. The training will cover regulatory topics including applicable drug regulations and
training in good clinical practice. The training will also provide in-depth explanations regarding
study procedures, clinical care, adverse event reporting, data entry procedures, quality assurance,
site monitoring and the informed consent process. A manual of study operations will be created
and provided to each site investigator prior to the start of enrollment. The manual will detail
specific information about the study procedures, regulatory information, safety reporting, and other
necessary information. Updates and revisions to the manual will be made available electronically.
The DCC, in collaboration with the study PIs and clinical Co-Investigator (Drs. Johnson, Zorc, and
Stanley), will be the main contact for study-related questions.
Prior to the start of enrollment, lead investigators and each sites research coordinator, along with
DCC staff will meet virtually or in person for a training session. Each site investigator will
instruct the ED physician colleagues at their home institutions about the study, serve as a local
advocate and champion for the study, and answer questions as they arise. Throughout the study, the
study investigators and research coordinators will also have at least monthly scheduled telephone
conference calls and/or webinars for all study personnel, or more frequent group communications as
necessary. BD medical, which recently acquired Velano Vascular, the developer of the PIVO device,
will conduct training on the use of PIVO with blood-collection staff prior to subject enrollment.
Monitoring of the research activities conducted during the pilot trial will be supported by quality
assurance (QA) visits conducted regularly by the nodal administrators of the involved PECARN
sites, including regular assessment of support and funding for study effort, and preparation for
monitoring by the PECARN DCC and other data regulatory bodies including the FDA. Regular
QA visits by the DCC at each site ensures a proactive rather than reactive approach to addressing
study-related issues. Each QA visit is followed by joint discussion with the nodal administrator and
study staff to define isolated, structural, or study-related barriers to study success. These ensure that
oversight of PECARN sites is timely, comprehensive, and effective.
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12
Regulatory Considerations
12.1
Food and Drug Administration
We have obtained IND #133781 from the FDA and anticipate close coordination with the FDA
going forward as we prepare our study protocols, including our Investigators Brochure.
12.2
Health Insurance Portability and Accountability Act
Data elements collected include the date of birth and date of admission. Prior to statistical analyses,
dates will be used to calculate patient age at the time of the study events. The final data sets (used
for study analyses and archived at the end of the study) will be de-identified, and will exclude these
specific dates.
Data elements for race, ethnicity, and gender are also being collected. These demographic data are
required for Federal reporting purposes to delineate subject accrual by race, ethnicity, and gender.
For purposes of the DCC handling potential protected health information (PHI) and producing the
research data sets that will be used for analyses and the de-identified public use data sets, all study
sites have been offered a Business Associate Agreement with the University of Utah. Copies of
executed Business Associate Agreements are maintained at the DCC.
12.3
Inclusion of Women and Minorities
There will be no exclusion of patients based on gender, race, or ethnicity.
12.4
ClinicalTrials.gov Requirements
This trial will be registered at ClinicalTrials.gov in accordance with Federal regulations.
12.5
Retention of Records
For federally funded studies subject to the Common Rule, records relating to the research conducted
shall be retained for at least 3 years after completion of the research. Completion of the research
for this protocol should be anticipated to include planned primary and secondary analyses, as
well as subsequent derivative analyses. Completion of the research also entails completion of all
publications relating to the research. All records shall be accessible for inspection and copying
by authorized representatives of the regulatory authorities at reasonable times and in a reasonable
manner [45 CFR].
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12.6
Public Use Data Set
After subject enrollment and follow up have been completed, the DCC will prepare a final study
database for analysis. A releasable database will be produced and completely de-identified in
accordance with the definitions provided in the Health insurance Portability and Accountability Act
(HIPAA). Namely, all identifiers specified in HIPAA will be recoded in a manner that will make it
impossible to deduce or impute the specific identity of any patient. The database will not contain
any institutional identifiers.
The DCC will also prepare a data dictionary that provides a concise definition of every data
element included in the database. If specific data elements have idiosyncrasies that might affect
interpretation or analysis, this will be discussed in the dictionary document. In accordance with
policies determined by the investigators and funding sponsors, the releasable database will be
provided to users in electronic form.
13
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