Clinical trial NCT01978535
Conditions: Postural Orthostatic Tachycardia Syndrome
Keywords: POTS
Sponsor: Mayo Clinic
Start date: 2014-12-17; Completion date: 2017-09-08
Enrollment: 3 participants; Allocation: RANDOMIZED; Intervention model: PARALLEL

Brief summary:
This study is designed to investigate whether the treatment of non-anemic iron deficiency with intervenous iron sucrose will result in decreased symptom reporting and improved cardiovascular indices in adolescents (age 12-21) with Postural Orthostatic Tachycardia Syndrome (POTS).

Detailed description:
Postural orthostatic tachycardia syndrome (POTS) is characterized by an exaggerated heart rate response to the standing position in a patient with symptoms of orthostatic intolerance. It is likely a heterogeneous disorder representing a common manifestation of a number of possible underlying derangements such as impaired sympathetically mediated vasoconstriction, excessive sympathetic drive, volume dysregulation and deconditioning. While the actual prevalence of POTS is unknown, it has been estimated to affect at least 500,000 individuals in the United States. It predominately affects young individuals, and particularly women.

The prevalence of iron deficiency in adolescents with POTS has been reported to be greater than that expected in the general adolescent population. The use of intravenous iron sucrose has been shown to be a safe and effective therapy for correcting iron deficiency in children and adolescents. Anecdotal experience at our clinic has demonstrated an immediate reduction in self-reported orthostatic symptoms in several patients diagnosed with POTS following the administration of intravenous iron sucrose for iron deficiency.

This study is a randomized, double blind, placebo-controlled study to assess the efficacy of a single iron sucrose infusion in adolescents with non-anemic iron deficiency and POTS. Subjects will be screened at outpatient clinic visit appointments. Interested qualified subjects will be consented and offered participation in this trial. Once consent and assent (for patients less than 18 years of age) has been obtained, subjects will be randomized to either treatment or placebo group. Subjects will participate in two on site study visits. During the first visit subjects will complete baseline laboratory studies, tilt table test and study questionnaires. Subjects will then receive the intervention study drug or placebo. The second study visit will occur 7 days + 2 days from the first study visit. During the second study visit subjects will repeat laboratory studies, tilt table test and study questionnaires. Follow up questionnaires will be sent to all subjects six months following the initial study visit.

Arms: arm 1: Iron Sucrose (Venofer (R)) arm 2: Equal volume to intervention of normal saline
Interventions: intervention 1: Iron infusion intervention 2: Normal saline infusion
Intervention descriptions: intervention 1: 5 mg/kg of intravenous iron sucrose supplied as Venofer (TM) with a maximum dose of 200mg. Iron sucrose will be diluted to 1 mg of elemental iron in 1 mL of NaCl 0.9% with a maximum volume of 210 mL. intervention 2: Normal saline (NaCl 0.9%) 5 mL/kg up to a maximum volume 210 mL

Protocol documents:
Prot_SAP_000.pdf: 
 
 
 
 
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A Randomized, Controlled, Double-Blind, Placebo-Controlled Study 
Evaluating the Efficacy of Intravenous Iron Sucrose in Adolescents with 
Non-anemic Iron Deficiency and Postural Orthostatic Tachycardia 
Syndrome (POTS) 
 
 
 
Principal Investigator: 
Amie E. Jones, MD 
Department of Pediatrics and Adolescent Medicine  
Mayo Clinic  
200 Street Southwest 
Rochester, Minnesota 55905 
(507) 284-3373 
 
Study Product: 
Iron Sucrose marketed as Venofer®  
Protocol Number: (IRBe) 
12-009963 
 
 
 
 
 
Initial version: Version (1) March 26, 2013 
 
 Version (2) April 5, 2013 
 
 Version (3) May 13, 2013 
 
 
 
   Version (4) July 15, 2015 
 
 
 
Version (5) June 2, 2016 
 


 
 
 
 
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Table of Contents 
 
STUDY SUMMARY ...................................................................................................................................... 5 
1 
INTRODUCTION ................................................................................................................................. 7 
1.1 
BACKGROUND .................................................................................................................................... 7 
1.2 
INVESTIGATIONAL AGENT .................................................................................................................... 8 
1.3 
CLINICAL DATA TO DATE................................................................................................................... 10 
1.4 
DOSE RATIONALE AND RISK/BENEFITS ................................................................................................ 11 
2 
STUDY OBJECTIVES ........................................................................................................................ 12 
3 
STUDY DESIGN ................................................................................................................................. 12 
3.1 
GENERAL DESIGN ............................................................................................................................. 12 
3.2 
PRIMARY STUDY ENDPOINTS .............................................................................................................. 13 
3.3 
PRIMARY SAFETY ENDPOINTS ............................................................................................................ 13 
4 
SUBJECT SELECTION ENROLLMENT AND WITHDRAWAL ...................................................... 13 
4.1 
INCLUSION CRITERIA ......................................................................................................................... 13 
4.2 
EXCLUSION CRITERIA ........................................................................................................................ 14 
4.3 
SUBJECT RECRUITMENT, ENROLLMENT AND SCREENING ....................................................................... 14 
4.4 
EARLY WITHDRAWAL OF SUBJECTS .................................................................................................... 15 
4.4.1 
When and How to Withdraw Subjects ........................................................................................ 15 
4.4.2 
Data Collection and Follow-up for Withdrawn Subjects .............................................................. 16 
5 
STUDY DRUG .................................................................................................................................... 16 
5.1 
DESCRIPTION .................................................................................................................................... 16 
5.2 
TREATMENT REGIMEN ....................................................................................................................... 16 
5.3 
METHOD FOR ASSIGNING SUBJECTS TO TREATMENT GROUPS ................................................................ 17 
5.4 
PREPARATION AND ADMINISTRATION OF STUDY DRUG ......................................................................... 17 
5.5 
SUBJECT COMPLIANCE MONITORING ................................................................................................... 18 
5.6 
PRIOR AND CONCOMITANT THERAPY .................................................................................................. 18 
5.7 
PACKAGING ...................................................................................................................................... 18 
5.8 
BLINDING OF STUDY .......................................................................................................................... 18 
5.9 
RECEIVING, STORAGE, DISPENSING AND RETURN ................................................................................. 18 
5.9.1 
Receipt of Drug Supplies .......................................................................................................... 18 
5.9.2 
Storage ................................................................................................................................... 18 
5.9.3 
Dispensing of Study Drug ......................................................................................................... 19 
5.9.4 
Return or Destruction of Study Drug ......................................................................................... 19 
6 
STUDY PROCEDURES ...................................................................................................................... 19 
6.1 
VISIT 1 ............................................................................................................................................. 20 
6.2 
VISIT 2 ............................................................................................................................................. 21 
6.3 
MAIL FOLLOW-UP .............................................................................................................................. 21 
7 
STATISTICAL PLAN ......................................................................................................................... 22 
7.1 
SAMPLE SIZE DETERMINATION ........................................................................................................... 22 
7.2 
STATISTICAL METHODS ..................................................................................................................... 22 
7.3 
SUBJECT POPULATION(S) FOR ANALYSIS ............................................................................................. 23 
8 
SAFETY AND ADVERSE EVENTS ................................................................................................... 23 
8.1 
DEFINITIONS ..................................................................................................................................... 23 
8.2 
RECORDING OF ADVERSE EVENTS ....................................................................................................... 26 


 
 
 
 
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8.3 
REPORTING OF SERIOUS ADVERSE EVENTS AND UNANTICIPATED PROBLEMS .......................................... 26 
8.3.1 
Investigator reporting: notifying the Mayo IRB ........................................................................... 27 
8.4 
UN-BLINDING PROCEDURES ............................................................................................................... 27 
8.5 
STOPPING RULES ............................................................................................................................... 27 
8.6 
MEDICAL MONITORING ..................................................................................................................... 27 
8.6.1 
Internal Data and Safety Monitoring Board ............................................................................... 28 
9 
DATA HANDLING AND RECORD KEEPING .................................................................................. 28 
9.1 
CONFIDENTIALITY ............................................................................................................................. 28 
9.2 
SOURCE DOCUMENTS ........................................................................................................................ 28 
9.3 
CASE REPORT FORMS ........................................................................................................................ 28 
9.4 
RECORDS RETENTION ........................................................................................................................ 29 
10 
STUDY MONITORING, AUDITING, AND INSPECTING ................................................................ 29 
10.1 
STUDY MONITORING PLAN ............................................................................................................ 29 
10.2 
AUDITING AND INSPECTING ........................................................................................................... 29 
11 
ETHICAL CONSIDERATIONS ......................................................................................................... 30 
12 
STUDY FINANCES ............................................................................................................................ 30 
12.1 
FUNDING SOURCE ......................................................................................................................... 30 
12.2 
CONFLICT OF INTEREST ................................................................................................................. 30 
12.3 
SUBJECT STIPENDS OR PAYMENTS .................................................................................................. 30 
13 
PUBLICATION PLAN ....................................................................................................................... 31 
14 
REFERENCES ................................................................................................................................... 31 
 
 
 
 
 
 
 
 


 
 
 
 
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List of Abbreviations 
 
 
LIST OF ABBREVIATIONS 
AE 
Adverse Event/Adverse Experience 
CFR 
Code of Federal Regulations 
CRF 
Case Report Form 
DSMB 
Data and Safety Monitoring Board 
FDA 
Food and Drug Administration 
GCP 
Good Clinical Practice 
HIPAA 
Health Insurance Portability and Accountability Act 
IB 
Investigator’s Brochure 
 
 
IND 
Investigational New Drug Application 
IRB 
Institutional Review Board 
PHI 
Protected Health Information 
PI 
Principal Investigator 
SAE 
Serious Adverse Event/Serious Adverse Experience 
SOP 
Standard Operating Procedure 
 
 
 
 
 
 


 
 
 
 
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Study Summary 
Title 
A Randomized, Controlled, Double-Blind, Placebo-Controlled Study 
Evaluating the Efficacy of Intravenous Iron Sucrose in Adolescents with 
Non-anemic Iron Deficiency and Postural Orthostatic Tachycardia 
Syndrome (POTS) 
Running Title 
Iron Sucrose in Adolescents with Iron Deficiency and POTS 
Protocol Number 
12-009963 
Phase 
Phase II 
Methodology 
Randomized, controlled, double-blind, placebo-controlled 
Overall Study 
Duration 
Expected duration of 2 years 
Subject Participation 
Duration 
Six months  
Single or Multi-Site  
Single center 
Objectives 
1. To assess whether a single infusion of iron sucrose will improve 
orthostatic symptoms as measured by a validated survey 
instrument in adolescent subjects with POTS and non-anemic 
iron deficiency 
 
2. To assess whether a single infusion of iron sucrose will improve 
cardiovascular indices, specifically a reduction in the intraval of 
measured heart rate change, during a ten minute head up tilt, in 
adolescent subjects with POTS and non-anemic iron deficiency 
 
3. To determine if abnormalities in standing and supine 
catecholamine levels will improve following intravenous iron 
sucrose infusion in adolescent subjects with POTS and non-
anemic iron deficiency 
Number of Subjects 
30 
Diagnosis and Main 
Inclusion Criteria 
Adolescent subjects 12-21 years of age who have a diagnosis of Postural 
Orthostatic Tachycardia Syndrome and non-anemic iron deficiency as 
defined by a serum ferritin level of less than or equal to 20 ug/L  
Study Product, Dose, 
Route, Regimen 
5 mg/kg of intravenous iron sucrose supplied as Venofer ® (maximum 
dose of 200 mg).  Iron sucrose will be diluted to 1 mg of elemental iron 
in 1 mL of NaCl 0.9% (maximum volume of 210 mL).   
Duration of 
Administration 
Single dose administration 
Reference therapy 
Normal saline (NaCl 0.9%) 5 mL/kg (maximum volume 210 mL) 


 
 
 
 
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Statistical 
Methodology 
Data will be visually inspected for normality.  Group comparisons will 
include Fisher’s exact test for categorical variables and Wilcoxon rank 
sums for continuous variables.  Confidence intervals will be calculated 
at 95%.  All P-values will be 2-sided with values less than 0.05 
considered significant.  All analyses will be performed on an “intention 
to treat” basis.  
 
 


 
 
 
 
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1 Introduction 
 
This document is a clinical research protocol for a human research study. This study will be 
carried out in accordance with the applicable United States government regulations and Mayo 
Clinic research policies and procedures.  
1.1 
Background 
 
Postural orthostatic tachycardia syndrome (POTS) is characterized by an exaggerated heart rate 
response to the standing position in a patient with symptoms of orthostatic intolerance [1].  It is 
likely a heterogeneous disorder representing a common manifestation of a number of possible 
underlying derangements such as impaired sympathetically mediated vasoconstriction, excessive 
sympathetic drive, volume dysregulation and deconditioning [2].  POTS was first described in 
the literature by Low and Schondorf in 1993 and was recognized in adolescent by Stewart et al. 
in 1999 [3, 4] While the actual prevalence of POTS is unknown, it has been estimated to affect at 
least 500,000 individuals in the United States [5].  It predominately affects young individuals, 
and particularly women[6].   
 
The prevalence of iron deficiency in adolescents with POTS has been reported to be greater than 
that expected in the general adolescent population [7, 8].  Iron is an essential element in both 
cellular and enzymatic function.  Iron deficiency is one of the most common nutritional 
deficiencies noted worldwide [9].  Iron deficiency has been estimated to affect nearly 7.8 million 
adolescent girls and women of childbearing age in the United States [8].  Iron deficiency has 
been linked to numerous clinical findings in children and adolescents including decreased motor 
activity, social inattention, delayed cognitive development, neurally mediated syncope, restless 
legs syndrome and chronic fatigue [7, 9, 10].  Iron supplementation in non-anemic, iron-deficient 
adolescent girls has demonstrated improvements in cognitive functioning [11].  A double-
blinded, placebo-controlled trial demonstrated a reduction of chronic fatigue symptoms 
following intravenous iron administration in iron deficient, non-anemic patients [12].  A similar 
study showed a reduction in symptoms of restless leg syndrome following iron infusion for iron-
deficient patients [13].   
 
Interestingly, elevations in urine and blood catecholamine levels have  been  described in non-
anemic iron deficient animal models [14].  Similar urine catecholamine elevations were found in 
children with iron deficient anemia [15].  An adult study demonstrated elevated serum 
catecholamines levels in iron deficient patients with anemia, and found that anemia from other 
causes had no significant increase in plasma catecholamine levels [16].  While the 
pathophysiology of catecholamine synthesis, function and degradation is still not fully 
understood, it is possible that iron may be an integral component, given its ubiquitous role in 
enzyme function.  Catecholamine derangements have been found in patients diagnosed with 
POTS, thus there may be a correlation between iron deficiency and POTS.   
 
Adolescence is a complex time of physical, emotional, social, cognitive and moral development 
[17].  These changes are paralleled by transitions from parental to self-management for health 
care related issues.  Although adolescents are increasingly responsible for their health care 


 
 
 
 
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decisions, there is an extensive literature highlighting poor medication adherence in this 
population [18].  Oral iron supplements, in particular, are commonly discontinued due to patient 
complaints of gastric irritation and lack of palatability [19].  In part given these limitations, 
intravenous iron supplementation has been used clinically for correction of iron deficiency in 
select adolescent patients who are otherwise healthy.   
 
The use of intravenous iron sucrose has been shown to be a safe and effective therapy for 
correcting iron deficiency in children and adolescents [20, 21].  Iron sucrose administered at a 
dose of 7 mg Fe/kg, up to a maximum dose of 300 mg of iron sucrose, has been shown to be 
well-tolerated in children and adolescents [20].  Adult data have found similar safety and limited 
side effects with single intravenous doses less that 300 mg of iron sucrose [22].   
 
Anecdotal experience at our clinic has demonstrated an immediate reduction in self-reported 
orthostatic symptoms in several patients diagnosed with POTS following the administration of 
intravenous iron sucrose for iron deficiency. 
 
1.2 
Investigational Agent 
 
The following text in this section 1.2 is taken directly from the Drug Summary available on 
MD Consult.  This information was last updated September 28, 2012[23]: 
 
Description: Iron sucrose is an intravenous iron formulation approved for the treatment of iron 
deficiency anemia in patients with chronic kidney disease. Iron sucrose is one of the oldest 
parenteral iron preparations available; it has been used clinically for more than 50 years. 
Parenteral iron is preferred over oral iron therapy when rapid repletion of iron-depleted patients 
is desired. Intravenous iron has been used to treat the anemia associated with dialysis and may 
reduce the need for erythropoietin dosage by about 40%[24].  Iron sucrose contains ferric 
hydroxide complexed with sucrose; this complex has a molecular weight of 34,000—60,000 
daltons. This compound is free of ferrous ion and dextran polysaccharides. In contrast, iron 
dextran consists of a complex of ferric oxyhydroxide with dextrans. Parenteral iron sucrose 
(Venofer®) and iron gluconate (Ferrlecit® , see separate monograph) appear less likely to cause 
hypersensitivity reactions than iron dextran[25], and have been used in patients with a 
hypersensitivity to iron dextran[26-28].  However, hypersensitivity may occur with iron sucrose 
also; serious and fatal anaphylactic reactions have been reported. Intravenous iron sucrose 
rapidly increases serum iron concentrations, which can be reliably measured 48 hours after 
administration. Iron sucrose complex (Venofer) was originally approved by the FDA for 
administration by slow IV injection or IV infusion in November 2000 in adult patients with iron 
deficiency anemia and chronic kidney disease requiring hemodialysis who are receiving 
supplemental erythropoietin therapy. In June 2005, the FDA approved iron sucrose for the 
treatment of iron deficiency anemia in non-dialysis dependent adult patients with chronic kidney 
disease, and in October 2005, the FDA approved iron sucrose for the treatment of iron deficiency 
anemia in adult patients with chronic kidney disease on peritoneal dialysis who are receiving 
supplemental erythropoietin therapy. In September 2012, iron sucrose was approved for iron 
maintenance treatment in pediatric patients >= 2 years with iron deficiency anemia and chronic 


 
 
 
 
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kidney disease who require hemodialysis, peritoneal dialysis, or are non-dialysis dependent and 
are receiving supplemental erythropoietin therapy[28].  
Mechanism of Action: Normal erythropoiesis depends on the concentration of iron and 
erythropoietin available in the plasma, both being decreased in renal failure. Exogenous 
administration of erythropoietin increases red blood cell production and iron utilization, 
contributing to iron deficiency in hemodialysis patients. Intravenous iron has been used to treat 
the anemia associated with hemodialysis and may reduce the need for erythropoietin dosage by 
about 40%. Following IV administration of iron sucrose, the complex of polynuclear iron (III)-
hydroxide in sucrose is dissociated into iron and sucrose by the reticuloendothelial system. In 
addition, a competitive exchange of iron takes place from the iron sucrose complex to the iron-
binding protein transferrin. A therapeutic response to treatment with iron therapy is dependent 
upon the patient's iron stores and the ability to use the iron. Use of iron is influenced by the cause 
of the deficiency as well as other illnesses that can affect normal erythropoiesis. Protein-energy 
malnutrition can prevent the incorporation of iron into the erythrocyte regardless of the quantity 
of iron stored. Only when lean body mass expands will iron be used. Iron therapy alone does not 
increase red blood cell production. Administration of iron only improves anemia which is 
associated with iron deficiency. 
 
Iron-containing proteins and enzymes are important in oxidation-reduction reactions, especially 
those of the mitochondria. Iron is a component of myoglobin and several heme-enzymes, 
including the cytochromes, catalase, and peroxidase. Iron is an essential component of the 
metalloflavoprotein enzymes and the mitochondrial enzyme alpha-glycerophosphate oxidase. 
Iron-containing proteins and enzymes are important in oxidation-reduction reactions, especially 
those of the mitochondria. Furthermore, iron is a cofactor for enzymes such as aconitase and 
tryptophan pyrrolase. Iron deficiency not only causes anemia and decreased oxygen delivery, it 
also reduces the metabolism of muscle and decreases mitochondrial activity. Iron deficiency can 
also lead to defects in learning or thermoregulation. Thus iron is important to several metabolic 
functions which are independent of its importance to erythropoiesis. 
 
Pharmacokinetics: Iron sucrose is administered intravenously. In healthy adults receiving IV 
doses of iron sucrose, its iron component appears to distribute mainly in blood and to some 
extent in extravascular fluid. A significant amount of the administered iron distributes in the 
liver, spleen and bone marrow. The bone marrow is considered an iron trapping compartment 
and not a reversible volume of distribution. Following IV administration, iron sucrose is 
dissociated into iron and sucrose by the reticuloendothelial system. The sucrose component is 
eliminated primarily by urinary excretion (75.4% in 24 h). Approximately 5% of the iron is 
excreted in the urine over 24 hours. In healthy adults treated with IV iron sucrose, the iron 
component exhibits linear kinetics with an elimination half-life of about 6 hours and a systemic 
clearance of 1.2 L/h. 
  
Iron therapy dosage is individualized according to patient goals for serum iron levels, iron 
storage parameters (e.g., ferritin, transferrin saturation) and serum hemoglobin concentrations. 
Iron toxicity may occur with excessive or unnecessary iron therapy. Systemic iron is stored in 
compounds called ferritin and hemosiderin, which are used for future use in the production of 
hemoglobin. The absorption of iron depends upon the route of entry. The tissue that first clears 
parenterally administered iron from the bloodstream determines the bioavailability. If the 


 
 
 
 
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reticuloendothelial system clears iron, only small amounts will be available over time to the bone 
marrow. Transferrin accepts iron from the intestinal tract or from sites of storage or hemoglobin 
destruction. Iron is then transported in plasma bound to transferrin and distributed to the bone 
marrow for hemoglobin synthesis, to the reticuloendothelial system for storage, to all cells for 
enzymes containing iron and to placental cells if needed to meet fetal needs. Transferrin 
eventually becomes available for reuse. There is no destructive metabolism of iron because it 
takes place in a closed system. In normal adults, ninety percent of metabolized iron is conserved 
and reutilized repeatedly. Very little iron is eliminated. In normal, healthy adults, some daily loss 
of iron occurs through normal skin, hair, and nail loss, and GI losses. Menstruating women have 
an increased loss as do other persons with loss of blood. 
 
•Special Populations 
 
Pediatrics 
Following a single-dose of iron sucrose 7 mg/kg (max = 200 mg) in patients 12-16 years (n = 11) 
with non-dialysis dependent chronic kidney disease, mean AUC was 31305 mcg x h/dl and mean 
Cmax was 8545 mcg/dl, which were 1.67- and 1.42-fold higher than reported values in adults. The 
half-life of total serum iron was 8 hours[28].  
 
Gender Differences 
The effects of gender on the pharmacokinetics of iron sucrose have not been studied. 
 
1.3 
Clinical Data to Date 
 
Several clinical studies were conducted by the manufacturer.  One study was conducted in 
children.  It was a randomized, open-label, dose-ranging study for iron maintenance treatment in 
pediatric patients with dialysis-dependent or non-dialysis-dependent CKD on stable 
erythropoietin therapy. The study randomized patients to one of three doses of Venofer (0.5 
mg/kg, 1.0 mg/kg or 2.0 mg/kg). The mean age was 13 years (range 2 to 20 years). Over 70% of 
patients were 12 years or older in all three groups. There were 84 males and 61 females. About 
60% of patients underwent hemodialysis and 25% underwent peritoneal dialysis in all three dose 
groups. At baseline, the mean hemoglobin was 12 g/dL, the mean TSAT was 33% and the mean 
ferritin was 300 ng/mL. Patients with HDD-CKD received Venofer once every other week for 6 
doses. Patients with PDD-CKD or NDD-CKD received Venofer once every 4 weeks for 3 doses. 
Among 131 evaluable patients with stable erythropoietin dosing, the proportion of patients who 
maintained hemoglobin between 10.5 g/dL and 14.0 g/dL during the 12-week treatment period 
was 58.7%, 46.7%, and 45.0% in the Venofer 0.5 mg/kg, 1.0 mg/kg, and 2.0 mg/kg groups, 
respectively. A dose-response relationship was not demonstrated[28]. 
 
Since iron sucrose has been available for clinical use, it has been used in several research studies, 
two of these studies included children and adolescents with iron deficiency not related to 
underlying chronic renal failure [20, 21].  In one of these studies, 38 children were treated with 
parenteral iron sucrose for treatment of iron deficiency [20].  Five mild reactions were reported 
and included one patient with headache, two patients with abdominal pain, one patient with 
transient mild low blood pressure and one patient with fainting.  In this study, one 15 year old 


 
 
 
 
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female had a serious allergic reaction that responded to treatment.  This patient was treated with 
500 mg of iron sucrose, which was above the recommended maximum dose of 300 mg.  This 
study concluded that parenteral iron was a “safe and effective means to treat iron deficiency in 
children who cannot receive or do not respond to oral iron due to intolerance, poor adherence, or 
iron malabsorption” [20].   
 
1.4 
Dose Rationale and Risk/Benefits 
 
Venofer®, an iron sucrose infusion preparation, has been approved by the U.S. Food and Drug 
Administration (FDA) for treatment of children and adolescents with iron-deficiency anemia and 
chronic kidney disease.  The use of iron sucrose infusion is not FDA approved for the treatment 
of iron deficiency in adolescents with POTS.    
 
In efficacy studies in non-dialysis dependent-chronic kidney disease patients (N=139), the most 
frequent adverse events (≥5%) whether or not related to Venofer® administration, were nausea 
(8.6%), taste disturbance (7.9%), peripheral edema (7.2%), diarrhea (7.2%), dizziness (6.5%), 
hypertension (6.5%), infusion site pain or burning (5.8%), dyspnea (5.8%), and vomiting 
(5.0%)[28] 
 
In rare cases, serious hypersensitivity reactions, including anaphylactic-type reactions, some of 
which have been life-threatening and fatal, have been reported in patients receiving Venofer® 
(iron sucrose injection, USP).  Patients may present with shock, clinically significant 
hypotension, loss of consciousness, and/or collapse[28].  
 
Dexferrum®, an iron dextran infusion preparation, is FDA indicated for the treatment of children 
and adults with documented iron deficiency in whom oral administration is unsatisfactory or 
impossible.  However, due to concerns for anaphylaxis reactions, iron dextran preparations have 
carried a FDA Black Box warning since 2009.  Due to the improved safety profile of iron 
sucrose compared to iron dextran, iron sucrose has been selected as the iron infusion preparation 
for this study intervention.  Iron sucrose does not carry a Black Box warning and does not 
require the pre-administration of medication test dose.   
 
The dose selected for the study intervention is 5 mg/kg of Venofer® (iron sucrose) with a 
maximum dose of 200 mg.  The dose will be diluted in normal saline 0.9% to a final 
concentration of 1 mg of elemental iron to 1 mL of normal saline 0.9%.  In the study from Crary 
et al., doses up to 7 mg iron/kg up to a maximum dose of 300 mg were found to be safe and 
effective [20].  Five mild reactions were reported and included one patient with headache, two 
patients with abdominal pain, one patient with transient mild low blood pressure and one patient 
with fainting.  One 15 year old female had a serious allergic reaction that responded to treatment.  
This patient was treated with 500 mg of iron sucrose, which was above the recommended 
maximum dose of 300 mg.  In a similar study performed by Pinsk et al., doses of 5 mg iron/kg 
were used in pediatric patients and also found to be well tolerated with minimal adverse 
reactions [21].   
 


 
 
 
 
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In a single-dose pharmokinetics study of Venofer, patients with NDD-CDK ages 12 to 16 
(N=11) received intravenous bolus doses of Venofer at 7 mg/kg (maximum 200 mg) 
administered over 5 minutes.  Following single dose Venofer, the half-life of total serum iron 
was 8 hours[28].   
. 
In this pilot study, subjects will receive only one dose of iron sucrose.   
 
Although adolescents are increasingly responsible for their health care decisions, there is an 
extensive literature highlighting  poor prescription medication adherence in this population [18].  
Oral iron supplements, in particular, are commonly discontinued due to patient complaints of 
gastric irritation and lack of palatability [19].  Nausea is also a common complaint of patients 
diagnosed with POTS, further complicating oral iron supplementation compliance.  Given these 
limitations, intravenous iron supplementation has been used clinically for correction of iron 
deficiency in select adolescent patients.    
 
 
2 Study Objectives 
 
1.  To assess whether a single infusion of iron sucrose will improve orthostatic symptoms as 
measured on a validated survey instrument in adolescent subjects with POTS and non-anemic 
iron deficiency 
2.  To assess whether a single infusion of iron sucrose will improve cardiovascular indices, 
specifically a reduction in heart rate change during a ten minute head up tilt, in adolescent 
subjects with POTS and non-anemic iron deficiency. 
3.  To determine if abnormalities in standing and supine catecholamine levels will improve 
following intravenous iron sucrose infusion in adolescent subjects with POTS and non-
anemic iron deficiency 
3 Study Design 
3.1 
General Design 
 
This study is a randomized, double blind, placebo-controlled study to assess the efficacy of a 
single iron sucrose infusion in adolescents with non-anemic iron deficiency and POTS.  Subjects 
will be screened at outpatient clinic visit appointments.  Interested qualified subjects will be 
consented and offered participation in this trial.  Once consent and assent (for patients less than 
18 years of age) has been obtained, subjects will be randomized to either treatment or placebo 
group.  Subjects will participate in two on site study visits.  During the first visit subjects will 
complete baseline laboratory studies, tilt table test and study questionnaires.  Subjects will then 
receive the intervention study drug or placebo.  The second study visit will occur 7 days + 2 days 
from the first study visit.  During the second study visit subjects will repeat laboratory studies, 
tilt table test and study questionnaires. Follow up questionnaires will be sent to all subjects six 
months following the initial study visit.     


 
 
 
 
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3.2 
Primary Study Endpoints 
 
The primary endpoint for this study is to determine the effects of iron sucrose on 1) self-reported 
symptoms of autonomic dysfunction assessed by a validated questionnaire and 2) cardiovascular 
indices measured by tilt table testing.   
3.3 
Primary Safety Endpoints 
 
Subjects will be continuously monitored during iron sucrose infusion and for no less than thirty 
minutes following the conclusion of the infusion.  During this time, subjects will have 
continuous cardiopulmonary monitoring of heart rate and oxygen saturation, with blood pressure 
measurement no less than every fifteen minutes.  Subjects will also be clinically assessed by 
medical staff from the clinical research unit for side effect symptoms.  Signs and symptoms of 
side effects will be recorded in the subject’s study record.  The primary investigator will review 
all side effects and correlation to dose amount and infusion rate will be carefully monitored.  All 
serious side effects will be reported promptly to the IRB.   Evidence that serious side effects 
occur at a rate beyond that reported in manufacture labeling will be reported promptly to the IRB 
and will be potential cause for study termination.   
 
All subjects will have ferritin, iron, and total iron binding capacity measured prior to iron 
infusion as well as one week following infusion.  Evidence of iron overload at the screening visit 
will preclude subject participation in the study.  Evidence of iron overload following the infusion 
will result in medical management recommendations from the primary investigator.  Data will be 
monitored for evidence of dose-dependent iron overload.  If a subject is found to develop 
clinically significant iron overload, the primary investigator will promptly report to the IRB and 
this will be potential cause for study termination.   
 
4 Subject Selection Enrollment and Withdrawal 
4.1 
Inclusion Criteria 
 
• Adolescent patients (age 12 to 21 years) with chronic (>3 months) symptoms of 
orthostatic intolerance, including but not limited to lightheadedness, syncope, 
headache, fatigue, weakness, sweating, nausea and heart palpitations.   
Screening and 
Randominzation 
(-21 to -1 day) 
Treatment Arm 
Study Visit 1  
(day 0) 
Study Visit 2 
(day 7) 
Follow up by mail 
(6 months) 
Placebo Arm 
Study Visit 1 
(day 0) 
Study Visit 2 
(day 7) 
Follow up by mail 
(6 months) 


 
 
 
 
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• Symptomatic orthostatic heart rate increment ≥40 bpm during a 10 minute 70 degree 
head up tilt study  
• Presence of non-anemic iron deficiency, defined as serum ferritin levels <20 ug/L 
with hemoglobin no less than 1 gm/dL below the normal reference range as defined 
for age and gender  
• Consent obtained from responsible guardian AND from subjects, 12-17 years of age 
• Consent obtained for subjects 18 years of age and older 
4.2 
Exclusion Criteria 
 
• Orthostatic hypotension (decrease of systolic BP>30 mmHg and/or diastolic 
BP>15mmHg within 3 minutes of 70 degree head up tilt study) 
• Pregnant or lactating females 
• The presence of failure of other organ systems or systemic illness that can affect 
autonomic function  
• Concomitant therapy with anticholinergic, alpha-adrenergic antagonists, beta-
adrenergic antagonists or other medications which could interfere with autonomic 
testing.  Patients may participate if the potentially interfering medication is held for 
five half-lives prior to the study 
• Laboratory evidence of anemia or iron overload 
• Personal history of hematochromatosis or first degree relative with 
hematochromatosis 
• Known sensitivity to Venofer® (iron sucrose injection, USP) or other intravenous 
iron preparation 
 
4.3 
Subject Recruitment, Enrollment and Screening 
 
Subjects will be recruited for this study from patients seen in the Department of Pediatric and 
Adolescent Medicine (DPAM) on the Mayo Clinic Rochester campus.  The study will be 
advertised to medical providers within DPAM, particularly those practicing in the divisions of 
General Pediatrics and Adolescent Medicine (GPAM), Pediatric Neurology, Pediatric 
Cardiology, Pediatric Gastroenterology and Community Pediatrics and Adolescent Medicine 
(CPAM).  Study information will be shared with these providers through verbal communication, 
printed materials and e-mail.  The information will include inclusion and exclusion criteria, 
contact information for the Primary Investigator and study coordinator and brief study overview. 
 
Patients will be screened by a study investigator or the study coordinator for review of study 
entry requirements. 
 
Study enrollment and screening: 
1. Will take place between 21 days  and the day of  first study visit 
2. Will take place either at patient point of care or the Clinical Research Unit 
3. Will review and document the following: 
a. Consent and assent forms based on age of subject 


 
 
 
 
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b. Subject demographics 
c. Physical exam by Mayo Clinic medical provider within 12 weeks of study 
enrollment 
d. Lab data (CBC, ferritin, total serum iron, percent iron saturation) within 12 
weeks of study enrollment that meets inclusion and exclusion parameters 
e. Current medication review and compliance with exclusion parameters 
f. Randomization procedure to treatment or placebo group 
 
Patients meeting the criteria will be offered participation in the study.  A screening log will be 
kept to document reasons for ineligibility and for non-participation of eligible candidates.  Those 
choosing to enroll will meet with a research study team member to complete the consent process.  
A research record will be generated for each study subjects.  Documentation that the subject 
satisfied inclusion and exclusion criteria will be made.   
 
For subjects less than 18 years of age, the parent or legal guardian will be required to participate 
in the consent process along with the subject.  The consent form will be reviewed by the study 
team member.  An opportunity will be given for questions.  Subjects will be asked to reflect the 
purpose and interventions of the study back to the research study team member.  A waiting 
period for contemplation will be offered to the potential subjects.  Subjects aged 12-17 years old 
will sign giving assent AND the parent or legal guardian will sign the consent form.  Subjects 18 
years of age will sign the consent form.  All signatures will be witnessed and co-signed by a 
study team member. The original form will be stored in the subject’s research record.   
 
Subjects will be provided with a copy of the consent form and will be provided a copy of subject 
responsibility during the study.   
 
4.4 
Early Withdrawal of Subjects 
4.4.1 When and How to Withdraw Subjects 
 
Subjects may stop their participation in the study at any time.  Withdrawal of consent or assent 
will terminate the subject’s participation in the study.  The Principal Investigator will follow up 
with subjects to determine if ongoing medical management that may be indicated for patient 
safety as a result of study discontinuation.  If the subject was in the treatment arm of the study, 
this may include follow up laboratory studies to assess laboratory response to therapy.  Medical 
recommendations will be made by the Principal Investigator based on these results.  The 
Principal Investigator will document reasons for subject dropout in the research record.  
 
If a subject is withdrawn from the study, an additional subject may be enrolled to maintain the 
statistical power of the study.   
 
In addition, the Principal Investigator or Mayo Clinic may stop the study at any time if there are 
severe adverse events or if adverse events are reported at a frequency higher than expected. 
 


 
 
 
 
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Subjects may be withdrawn from the study prior to completing all of the study if there is failure 
to adhere to the subject responsibility parameters.   
 
Subject responsibility during study: 
1. Subjects will be asked to stop taking medications that can potentially interact with tilt 
table test results at least 5 half-lives prior to study entry.  This includes, but is not 
limited to anticholinergic, alpha-adrenergic antagonists and beta-adrenergic 
antagonists 
2. Subjects will be asked to avoid caffeine and nicotine for at least 24 hours before each 
study site visit 
3. Upon enrollment, subjects will be asked to discontinue iron supplements and/or 
vitamins containing iron until after the second study visit is complete  
4. Subjects of child-bearing potential must have a negative urine beta-HCG (pregnancy 
test) prior to study entry 
5. Subjects who are sexually active and able to become pregnant must agree to use one 
of the birth control methods listed below until after the last study site visit: 
a. Hormonal methods, such as birth control pills, patches, injections, vaginal ring 
or implants 
b. Barrier methods (such as a condom or diaphragm) used with a spermicide (a 
foam, cream, or gel that kills sperm) 
c. Intrauterine device (IUD) 
d. Abstinence (no sex) 
4.4.2 Data Collection and Follow-up for Withdrawn Subjects 
 
Even though a subject has withdrawn from the study, it may be important to collect some follow-
up data on such subjects throughout the protocol defined follow-up period. Such data is 
important to the integrity of the final study analysis since early withdrawal could be related to the 
safety profile of the study drug.  If a subject withdraws consent to participate in the study, for 
subject safety reasons, attempts will be made to obtain permission to collect follow up 
information whenever possible.  
5 Study Drug  
5.1 
Description 
 
Iron sucrose solution supplied as Venofer® in a liquid form available in vials of 100 mg/5 mL 
and 200 mg/10 mL.   
5.2 
Treatment Regimen 
 
One treatment dose will be administered during this study and will take place during the First 
Study Visit.  The treatment dose will be 5 mg/kg of intravenous iron sucrose (maximum dose of 
200 mg).  Iron sucrose will be diluted to a concentration of 1 mg of elemental iron in 1 mL of 
NaCl 0.9% (maximum volume of 210 mL).  The infusion will be infused at 3.5 mL/minute.  A 
flush of 10 mL of  NaCl 0.9% will be given after the infusion.   


 
 
 
 
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5.3 
Method for Assigning Subjects to Treatment Groups 
 
Subjects entering the study will be randomized through the clinical trials research pharmacy 
using a 1:1 randomization process.  The Primary Investigator will be blinded to the 
randomization process.  The randomization key will be readily available in the event of a 
medical emergency associated with the study intervention.   
5.4 
Preparation and Administration of Study Drug 
 
The Clinical Research Unit’s Research Pharmacy will obtain Venofer® supplied in vials of 100 
mg/5 mL, from standard hospital supply at Mayo Clinic Hospital Rochester, MN.  The 
preparation of the study drug will take place in the Clinical Research Unit Research Pharmacy 
and will include the dilution of the drug to the recommended concentration of 1 mg/mL.  The 
drug will be maintained within recommended temperature ranges of 20°C to 25°C with 
excursions permitted to 15°C to 30°C[28].  Venofer® does have a brown color in concentrated 
form.  To ensure adequate blinding of study team members, the IV solution bag and tubing will 
be wrapped by the Research Pharmacy to conceal color.   
 
The study drug will have an accessory label reading "CAUTION: NEW DRUG LIMITED BY 
FEDERAL LAW TO INVESTIGATIONAL USE" as required by Federal Law.  It will also 
have a finished product label from the Research Pharmacy.  Below is a sample template : 
 
 
IRB – Iron Sucrose/Placebo 
 
Dose: 1 each  
Sodium Chloride 0.9%  
 
Dose: 100 mL  
Route: IV           
 
Frequency: Once  
Rate: _______ mL/hour 
Start Date/Time: __________                
Comment: IRB# 12-009963; Iron Sucrose _____ mg vs placebo 
 
 
Clinical Research Pharmacy Director: 
Christine M. Formea, Pharm.D., R.Ph. 
Domitilla Building 
Floor 05, Room 248 
Saint Mary’s Hospital 
1216 Second Street SW 
Rochester, MN 55905 
 
Research Pharmacist assigned to protocol: 
Jill Randolph, Pharm.D., R.Ph. 
507-255-5712 
 


 
 
 
 
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5.5 
Subject Compliance Monitoring 
 
Subjects will receive only one dose during the study.  No additional medication adherence will 
be required.   
5.6 
Prior and Concomitant Therapy 
 
Subjects will be required to discontinue therapy with anticholinergic, alpha-adrenergic 
antagonists, beta-adrenergic antagonists and other medications which could interfere with 
autonomic testing.  Subjects may participate if the potentially interfering medication is held for 
five half-lives prior to the study.  Enrolled subjects may not receive iron supplementation outside 
of study administration until after the Second Site Study Visit has been completed.   
5.7 
Packaging 
 
The following is taken directly from the manufacture drug information: 
Venofer® is supplied sterile in 10 mL, 5 mL, and 2.5 mL single-use vials. Each 10 mL vial 
contains 200 mg elemental iron, each 5 mL vial contains 100 mg elemental iron, and each 2.5 
mL vial contains 50 mg elemental iron (20 mg/mL): 
NDC-0517-2310-05 200 mg/10 mL Single-Use Vial Packages of 5 
NDC-0517-2310-10 200 mg/10 mL Single-Use Vial Packages of 10 
NDC-0517-2340-01 100 mg/5 mL Single-Use Vial Individually Boxed 
NDC-0517-2340-10 100 mg/5 mL Single-Use Vial Packages of 10 
NDC-0517-2340-25 100 mg/5 mL Single-Use Vial Packages of 25 
NDC-0517-2325-10 50 mg/2.5 mL Single-Use Vial Packages of 10 
NDC-0517-2325-25 50 mg/2.5 mL Single-Use Vial Packages of 25 
5.8 
Blinding of Study  
 
This study will be double-blinded such that the subject and Primary Investigator will be blinded 
to the randomization of the subject.    
5.9 
Receiving, Storage, Dispensing and Return 
5.9.1 Receipt of Drug Supplies 
 
Venofer® is available in the United States market and is maintained as routine medication stock 
supply in the Mayo Clinic Hospital Pharmacy.  The Clinic Research Pharmacy will obtain the 
drug used in this study from the stock supply in the Mayo Clinic Hospital Pharmacy.  
5.9.2 Storage 
 
All manufacture recommendations as listed in the drug monograph[28] will be followed:  
1. Store in original carton at 20°C to 25°C (68° F to 77° F); excursions permitted to 15° 
to 30°C (59° to 86°F). [See USP Controlled Room Temperature].  
2. Do not freeze. 


 
 
 
 
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3. IV Admixture Stability: Venofer®, when added to IV infusion bags (PVC or non-
PVC) containing 0.9% NaCl at concentrations ranging from 1 mg to 2 mg of 
elemental iron per mL, has been found to be physically and chemically stable for 7 
days at controlled room temperature (25°C ± 2°C). 
4. Do not dilute to concentrations below 1 mg/mL. 
5. Do not mix Venofer® with other medications or add to parenteral nutrition solutions 
for intravenous infusion. 
6. Parenteral drug products should be inspected visually for particulate matter and 
discoloration prior to infusion. 
 
5.9.3 Dispensing of Study Drug 
 
Regular study drug reconciliation will be performed to document drug assigned, drug dispensed, 
drug returns, and drug remaining.  This reconciliation will be logged on the drug reconciliation 
form, and signed and dated by the study team. 
5.9.4 Return or Destruction of Study Drug 
 
At the completion of the study, there will be a final reconciliation of drug dispensed, drug 
returns, and drug remaining.  This reconciliation will be logged on the drug reconciliation form, 
signed and dated.  Any discrepancies noted will be documented and investigated, prior to return 
or destruction of unused study drug.  Drug destroyed on site will be documented in the study 
files. 
6 Study Procedures 
 
Assessment 
Screening/Enrollment 
Visit (day -21  to day 0)  
Study Visit 1 
(day 0) 
Study Visit 2 
(day 7 ±2 days) 
Follow up by 
mail 
(6 months from 
day 0) 
Informed 
consent/assent form 
X 
 
 
 
Demographics 
X 
 
 
 
Vital signs 
X 
X 
X 
 
General physical 
exam 
X 
 
 
 
Current medications 
X 
X 
X 
X 
Inclusion/Exclusion 
Criteria 
X 
X 
X 
 
Randomization 
X 
 
 
 
Urine Beta-HCG for 
female subjects 
 
X 
 
 
Questionnaires 
(COMPASS-31 and 
PedsQL) 
 
X 
X 
X 
IV/Venipuncture 
(CBC, ferritin, iron, 
TIBC, percent of 
iron saturation, 
upright and supine 
 
X 
X 
 


 
 
 
 
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catecholamine) 
Tilt table test  
 
X 
X 
 
Orthostatic 
Symptom Scale 
(during tilt table) 
 
X 
X 
 
Intervention (study 
drug or placebo) 
 
X 
 
 
 
6.1 
Visit 1 
1. Study visit ONE will be conducted in the Clinical Research Unit.  All Study ONE 
visits will be scheduled such that the tilt table tests will be started during the window 
of 12 pm-4 pm.  Study ONE visit will include: 
a. Review of inclusion and exclusion criteria 
b. Vital sign screen 
c. For all female subjects: 
i. Documentation of last menstrual period date 
ii. Review of current birth control method and adherence 
iii. Urine Beta-HCG obtained and documented as negative 
d. Questionnaire completion  
i. COMPASS-31 Instrument to assess autonomic symptoms [29] 
ii. Pediatric Quality of Life Inventory (PedsQL) Version 4.0 [30] 
e.  IV/Venipuncture  
i. Complete blood count  
ii. Serum ferritin 
iii. Total serum iron, total iron binding capacity and percent iron 
saturation 
iv. Supine and standing catecholamine plasma levels  
v. Estimated blood volume to be drawn is less than 15 mL 
f. Ten minute, 70 degree head-up tilt table test which includes measurement of 
cardiovagal responses via heart rate variation to deep breathing (HRVDB), 
cardiac and vasomotor adrenergic responses via beat-to-beat heart rate, and 
blood pressure response with tilt and Valsalva maneuver.  
g. Orthostatic symptom scale assessing orthostatic symptoms during tilt on a 
visual analog severity scale from 0-10 
h. Administration of intervention (study drug OR placebo) followed by 10 mL 
NaCl 0.9% flush.  Patients will have continuous cardiopulmonary monitoring 
(heart rate, respiratory rate and pulse ox) with blood pressure documented no 
less than every minutes during the infusion 
i. Following the intervention, subjects will be monitored for signs and 
symptoms of intervention hypersensitivity for an additional thirty minutes. 
Patients will have continuous cardiopulmonary monitoring (heart rate, 
respiratory rate and pulse ox) with blood pressure documented no less than 
every fifteen minutes. 
2. Time estimates for Study Visit One (4-4.5 hours) 
a. Review of patient information (30 minutes) 
b. Questionnaire completion (1 hour) 
c. IV/Venipuncture (20 minutes) 


 
 
 
 
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d. Tilt table test (1 hour) 
e. Intervention (1-1.5 hours) 
f. Subject observation (30 minutes) 
6.2 
Visit 2 
3. Study visit TWO will take place 7 days +2 days following study visit ONE.  Study 
visit TWO will be completed in the Clinical Research Center.  The visit will be 
scheduled such that the tilt table test will be started during the window of 12 pm-4pm.   
Study visit TWO will include: 
a. Vital sign screen 
b. Questionnaire completion  
i. COMPASS-31 Instrument to assess autonomic symptoms 
ii. Pediatric Quality of Life Inventory (PedsQL) Version 4.0 
c.  IV/Venipuncture  
i. Complete blood count  
ii. Serum ferritin 
iii. Total serum iron, total iron binding capacity and percent iron 
saturation 
iv. Supine and standing catecholamine plasma levels  
v. Estimated blood volume to be drawn is less than 15 mL 
d. Ten minute, 70 degree head-up tilt table test which includes measurement of 
cardiovagal responses via heart rate variation to deep breathing (HRVDB), 
cardiac and vasomotor adrenergic responses via beat-to-beat heart rate, and 
blood pressure response with tilt and Valsalva maneuver 
e. Orthostatic symptom scale assessing orthostatic symptoms during tilt on a 
visual analog severity scale from 0-10 
4. Time estimates for Study visit TWO (3-3.5 hours) 
a. Review of patient information (30 minutes) 
b. Questionnaire completion (1 hour) 
c. IV/Venipuncture (20 minutes) 
d. Tilt table test (1 hour) 
 
6.3 
Mail follow-up  
5. Follow up by MAIL will take place 6 months after study visit ONE and will include: 
a. Questionnaire completion 
i. COMPASS-31 Instrument to assess autonomic symptoms 
ii. Pediatric Quality of Life Inventory (PedsQL) Version 4.0 
b. Self-reported current medication list 
c. Self-reported use of iron treatments (oral or intravenous) from study 
completion until 6 months post-study completion 
d. Subjects will be provided a self-addressed, pre-paid envelope to return the 
materials to the primary investigator 
6. Time estimate for Mail Follow-Up 
a. Questionnaire completion (1 hour) 
 


 
 
 
 
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7 Statistical Plan 
7.1 
Sample Size Determination 
 
The two primary outcome variables in this study will be change in score on the COMPASS-31 
survey and change in postural heart rate increase.  For an anticipated change in the COMPASS-
31 survey of 10 points, a sample size of 15 subjects per group (30 total) setting alpha at 0.05 and 
beta at 0.80 would be an adequate sample size to reject or accept the null hypothesis (power 
estimate >80%).  For an anticipated change in postural tachycardia from 50 beats per minute to 
30 beats per minute, a sample size of 15 subjects per group (30 total) setting alpha at 0.05 and 
beta at 0.80 would be adequate an adequate sample size to reject or accept the null hypothesis 
(power estimate >80%).  
7.2 
Statistical Methods 
 
Descriptive Statistics 
 
Univariate descriptive statistics and frequency distributions will be calculated, as appropriate for 
all variables.  Baseline values for demographic, clinical, and outcome variables (primary and 
secondary) will be tabulated for the treatment groups.  These analyses will help identify potential 
confounding variables to be used as covariates in sensitivity analyses.  Distributions across 
subgroups used in randomization will be compared to assess whether the randomization was 
successful in equalizing distributions of these prognostic variables across treatment groups.  
Putative prognostic variables that will be investigated through these descriptive analyses include 
subjective symptoms of autonomic dysfunction and cardiovascular indices.   
 
Handling of Missing Data 
 
Continuous data monitoring will be done by both study coordinator and the Primary Investigator 
using computer based systems.  Scheduled review of study documentation by study coordinator 
and Primary Investigator will take place at a frequency of no less than every four to six weeks to 
assure that all reports are on file, accurate and complete.  Prior to data analysis, trends and 
outliers will be reviewed to consider for potential missing data.   
 
Primary Hypothesis: Treatment of iron deficiency with intravenous iron sucrose in an 
adolescent with Postural Orthostatic Tachycardia Syndrome will reduce their score on the 
COMPASS-31 survey by 10 points. 
 
Data will be visually inspected for normality.  Group comparisons will include Fisher’s exact test 
for categorical variables and Wilcoxon rank sums for continuous variables.  Confidence intervals 
will be calculated at 95%.  All P-values will be 2-sided with values less than 0.05 considered 
significant.  All analyses will be performed on an “intention to treat” basis 
 
Secondary Hypothesis 1: Treatment of iron deficiency with intravenous iron sucrose in an 
adolescent with Postural Orthostatic Tachycardia Syndrome will reduce heart rate change during 
tilt table testing from 50 beats per minute to less than 30 beats per minute.   


 
 
 
 
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Data will be visually inspected for normality.  Group comparisons will include Fisher’s exact test 
for categorical variables and Wilcoxon rank sums for continuous variables.  Confidence intervals 
will be calculated at 95%.  All P-values will be 2-sided with values less than 0.05 considered 
significant.  All analyses will be performed on an “intention to treat” basis 
 
7.3 
Subject Population(s) for Analysis 
 
Protocol-compliant population:  Any subject who was randomized and received the protocol 
required study drug exposure and required protocol processing 
8 Safety and Adverse Events 
8.1 
Definitions 
Unanticipated Problems Involving Risk to Subjects or Others (UPIRTSO) 
Any unanticipated problem or adverse event that meets the following three criteria:  
• Serious: Serious problems or events that results in significant harm, (which may be 
physical, psychological, financial, social, economic, or legal) or increased risk for the 
subject or others (including individuals who are not research subjects). These include: (1) 
death; (2) life threatening adverse experience; (3) hospitalization - inpatient, new, or 
prolonged; (4) disability/incapacity - persistent or significant; (5) birth defect/anomaly; (6) 
breach of confidentiality and (7) other problems, events, or new information (i.e. 
publications, DSMB reports, interim findings, product labeling change) that in the opinion 
of the local investigator may adversely affect the rights, safety, or welfare of the subjects 
or others, or substantially compromise the research data, AND 
• Unanticipated: (i.e. unexpected) problems or events are those that are not already 
described as potential risks in the protocol, consent document, not listed in the 
Investigator’s Brochure, or not part of an underlying disease. A problem or event is 
"unanticipated" when it was unforeseeable at the time of its occurrence. A problem or 
event is "unanticipated" when it occurs at an increased frequency or at an increased 
severity than expected, AND 
• Related: A problem or event is "related" if it is possibly related to the research procedures. 
 
Adverse Event 
An untoward or undesirable experience associated with the use of a medical product (i.e. drug, 
device, biologic) in a patient or research subject. 
Serious Adverse Event 
Adverse events are classified as serious or non-serious.  Serious problems/events can be well 
defined and include; 
• death 
• life threatening adverse experience 
• hospitalization 
• inpatient, new, or prolonged; disability/incapacity 


 
 
 
 
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• persistent or significant birth defect/anomaly 
 
and/or per protocol may be problems/events that in the opinion of the investigator may have 
adversely affected the rights, safety, or welfare of the subjects or others, or substantially 
compromised the research data. 
 
Risk associated with use of Venofer®   
Information taken directly from the manufacturer[28]:   
In efficacy studies in non-dialysis dependent-chronic kidney disease patients (N=139), the most 
frequent adverse events (≥5%) whether or not related to Venofer® administration, were nausea 
(8.6%), taste disturbance (7.9%), peripheral edema (7.2%), diarrhea (7.2%), dizziness (6.5%), 
hypertension (6.5%), infusion site pain or burning (5.8%), dyspnea (5.8%), and vomiting (5.0%) 
 
In a randomized, open-label, dose-ranging trial for iron maintenance treatment with Venofer in 
pediatric patients with CKD on stable erythropoietin therapy at least one treatment-emergent 
adverse reaction was experienced by 57% (27/47) of the patients receiving Venofer 0.5 mg/kg, 
53% (25/47) of the patients receiving Venofer 1.0 mg/kg, and 55% (26/47) of the patients 
receiving Venofer 2.0 mg/kg. A total of 5 (11%) subjects in the Venofer 0.5 mg/kg group, 10 
(21%) patients in the Venofer 1.0 mg/kg group, and 10 (21%) patients in the Venofer 2.0 mg/kg 
group experienced at least 1 serious adverse reaction during the study. The most common 
treatment-emergent adverse reactions (> 2% of patients) in all patients were headache (6%), 
respiratory tract viral infection (4%), peritonitis (4%), vomiting (4%), pyrexia (4%), dizziness 
(4%), cough (4%), renal transplant (4%), nausea (3%), arteriovenous fistula thrombosis (2%), 
hypotension (2%), and hypertension (2.1%). 
 
In rare cases, serious hypersensitivity reactions, including anaphylactic-type reactions, some of 
which have been life-threatening and fatal, have been reported in patients receiving Venofer® 
(iron sucrose injection, USP).  Patients may present with shock, clinically significant 
hypotension, loss of consciousness, and/or collapse[28]. 
 
• Observations to be considered as adverse reactions will include but may not be 
limited to the following: 
Nausea, taste disturbance, peripheral edema, diarrhea, vomiting, dizziness, hypertension, 
hypotension, infusion site pain or burning, dyspnea, cough, headache, myalgia, arthralgia 
or pyrexia[28]. 
 
• Observations to be considered SERIOUS adverse reactions will include but may not 
be limited to the following: 
Anaphylactic-type reaction, shock, clinically significant hypotension or hypertension or 
other symptoms leading to hospitalization, surgery, disability, incapacity, birth 
defect/anomaly or death[28] 
 
All adverse events that do not meet any of the criteria for serious, should be regarded as 
non-serious adverse events.  
 


 
 
 
 
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Other potential risks associated with study participation, but not related to Venofer® use 
include the following: 
 
1. Subjects may have worsening of orthostatic symptoms upon discontinuation of medications 
as indicated in exclusion criteria.  These may include but are not limited to lightheadedness, 
fainting, headache and nausea 
 
2. IV and venipuncture may cause pain, bruising, lightheadedness, and/or fainting, or rarely, 
infection or infiltration of fluids  at the site of the needle stick 
 
3. Valsalva maneuver can increase pressure in the chest by 40 mm Hg.  There is a potential risk 
for detached retina and retinal hemorrhage 
 
4. Ten minute, 70 degree, head up tilt table test may lead to exacerbation of underlying 
orthostatic intolerance symptoms, including but not limited to lightheadedness, fainting, 
headache and nausea 
 
5. Confidentiality risk includes the possibility for inappropriate breach of confidentiality 
 
 
Adverse Event Reporting Period 
 
For this study, the study treatment follow-up period is defined as six months following the last 
administration of study treatment. 
 
Preexisting Condition 
A preexisting condition is one that is present at the start of the study.  A preexisting condition 
will be recorded as an adverse event if the frequency, intensity, or the character of the condition 
worsens during the study period. 
 
General Physical Examination Findings 
At screening, any clinically significant abnormality should be recorded as a preexisting 
condition.  At the end of the study, any new clinically significant findings/abnormalities that 
meet the definition of an adverse event will also be recorded and documented as an adverse 
event.  
 
Post-study Adverse Event 
All unresolved adverse events will be followed by the investigator until the events are resolved, 
the subject is lost to follow-up, or the adverse event is otherwise explained.  At the last scheduled 
visit, the investigator will instruct each subject to report, to the investigator, any subsequent 
event(s) that the subject, or the subject’s personal physician, believes might reasonably be related 
to participation in this study.  
 
Abnormal Laboratory Values 
A clinical laboratory abnormality will be documented as an adverse event if iron overload is 
detected in the post-treatment study visit (Study Visit 2).  Subjects found to have iron overload 
following treatment with the study drug will have medical recommendations made by the 


 
 
 
 
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Primary Investigator.  These recommendations may include follow up laboratory and clinical 
monitoring.  With the subject’s approval, the Primary Investigator will communicate with the 
subject’s primary care provider for coordination of medical management.     
 
Additional medical recommendations may also be made by the Principal Investigator for the 
subject if post-treatment laboratory data suggests that the subject remains iron deficient (serum 
ferritin <12ug/L) or iron insufficient (serum ferritin <25ug/L).   
 
Hospitalization, Prolonged Hospitalization or Surgery 
Any adverse event that results in hospitalization or prolonged hospitalization will be documented 
and reported as a serious adverse event unless specifically instructed otherwise in this protocol.  
Any condition responsible for surgery will be documented as an adverse event if the condition 
meets the criteria for an adverse event.  
 
Neither the condition, hospitalization, prolonged hospitalization, nor surgery are reported as an 
adverse event in the following circumstances:  
• Hospitalization or prolonged hospitalization for diagnostic or elective surgical procedures 
for a preexisting condition.  Surgery should not be reported as an outcome of an adverse 
event if the purpose of the surgery was elective or diagnostic and the outcome was 
uneventful. 
• Hospitalization or prolonged hospitalization for therapy of the target disease of the study, 
unless it is a worsening or increase in frequency of hospital admissions as judged by the 
clinical investigator. 
8.2 
Recording of Adverse Events 
At each contact with the subject, the study team must seek information on adverse events by 
specific questioning and, as appropriate, by examination.  Information on all adverse events will 
be recorded immediately in the source document, and also in the appropriate adverse event 
section of the subject’s research record.  All clearly related signs, symptoms, and abnormal 
diagnostic, laboratory or procedure results will be recorded in this source document. 
 
All adverse events occurring during the study period will be recorded.  The clinical course of 
each event will be followed until resolution, stabilization, or until it has been ultimately 
determined that the study treatment or participation is not the probable cause.  Serious adverse 
events that are still ongoing at the end of the study period will be followed up, to determine the 
final outcome.  Any serious adverse event that occurs after the study period and will be 
considered to be at least possibly related to the study treatment or study participation will be 
recorded and reported immediately. 
8.3 
Reporting of Serious Adverse Events and Unanticipated Problems 
 
When an adverse event has been identified, the study team will take appropriated action 
necessary to protect the study participant and then complete the Study Adverse Event Worksheet 
and log.  The sponsor-investigator will evaluate the event and determine the necessary follow-up 
and reporting required. 
 


 
 
 
 
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8.3.1 Investigator reporting: notifying the Mayo IRB 
 
The sponsor-investigator will report to the Mayo IRB any UPIRTSOs and Non-UPIRTSOs 
according to the Mayo IRB Policy and Procedures. 
 
Information will be collected on an adverse event worksheet (and entered in the research 
database):  
• Subject’s name  
• Medical record number 
• Disease diagnoses 
• The date the adverse event occurred 
• Description of the adverse event 
• Relationship of the adverse event to the research (drug, procedure, or intervention) 
• If the adverse event was expected 
• The severity of the adverse event (severity table with scale 1-5) 
• If any intervention was necessary 
• Resolution (was the incident resolved spontaneously, or after discontinuing treatment) 
• Date of Resolution 
 
The investigator will review all adverse event reports to determine if specific reports need to be 
made to the IRB.  The investigator will sign and date the adverse event report when it is 
reviewed.  For this protocol, only directly related SAEs/UPIRTSOs will be reported to the IRB. 
 
8.4 
Un-blinding Procedures 
 
Un-blinding will occur in the event that a subject’s safety is at risk.  This will be reported with 
any required study adverse event reporting to the IRB.   
 
Un-blinding for other, unanticipated reasons will also be reported as indicated to the IRB.    
8.5 
Stopping Rules  
 
Evidence that serious side effects occur at a rate beyond that reported in manufacture labeling 
will be reported promptly to the IRB and will be potential cause for study hold or termination. If 
study is placed on hold due to serious side effects, approval by the IRB will be required before 
study continuation.   
8.6 
Medical Monitoring 
It is the responsibility of the Principal Investigator to oversee the safety of the study at his/her 
site.  This safety monitoring will include careful assessment and appropriate reporting of adverse 
events as noted above, as well as the construction and implementation of a site data and safety-
monitoring plan.  Medical monitoring will include a regular assessment of the number and type 
of serious adverse events. 


 
 
 
 
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8.6.1 Internal Data and Safety Monitoring Board 
A Data and Safety Monitoring Plan (DSMP) will be filed with the Mayo Clinic IRB.   
9 Data Handling and Record Keeping 
9.1 
Confidentiality 
Information about study subjects will be kept confidential and managed according to the 
requirements of the Health Insurance Portability and Accountability Act of 1996 (HIPAA).  
Those regulations require a signed subject authorization informing the subject of the following: 
  
• What protected health information (PHI) will be collected from subjects in this study 
• Who will have access to that information and why 
• Who will use or disclose that information 
• The rights of a research subject to revoke their authorization for use of their PHI.  
 
In the event that a subject revokes authorization to collect or use PHI, the investigator, by 
regulation, retains the ability to use all information collected prior to the revocation of subject 
authorization.  For subjects that have revoked authorization to collect or use PHI, attempts will 
be made to obtain permission to collect at least vital status (long term survival status that the 
subject is alive) at the end of their scheduled study period. 
9.2 
Source Documents 
Source data is all information, original records of clinical findings, observations, or other 
activities in a clinical trial necessary for the reconstruction and evaluation of the trial.  Source 
data are contained in source documents.  Examples of these original documents, and data records 
include: hospital records, clinical and office charts, laboratory notes, memoranda, subjects’ 
diaries or evaluation checklists, pharmacy dispensing records, recorded data from automated 
instruments, copies or transcriptions certified after verification as being accurate and complete, 
microfiches, photographic negatives, microfilm or magnetic media, x-rays, subject files, and 
records kept at the pharmacy, at the laboratories, and at medico-technical departments involved 
in the clinical trial. 
9.3 
Case Report Forms 
 
Case report form (CRF) will be used for data collection for the study.  All data requested on the 
CRF will be recorded in a computer-based program.  All missing data will be explained.  If a 
space on the CRF is left blank because the procedure was not done or the question was not 
asked, “N/D” will be noted.  If the item is not applicable to the individual case, “N/A” will be 
noted.  All such changes of data entry will be noted, initialled and dated.   
 
Data Management 
 
Data will be entered into the subject’s research record by study team members.  The data will be 
maintained on a computer based system through the Clinical Trials Research Unit.   
 
 


 
 
 
 
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Data Security and Confidentiality 
 
All data forms and study specific information will be kept on password protected computers and 
locked file cabinets.  Data access will be limited to Principal Investigator and study coordinator.   
 
Data Quality Assurance 
 
The Primary Investigator will be responsible for monitoring study documentation made by study 
team members.  Review will occur at least every four to six weeks to document that all reports 
are on file, accurate and complete.  These documents will be made available to the IRB upon 
request.   
 
Data Clarification Process 
 
Any missing data or other data queries will be reviewed by the study coordinator and Primary 
Investigator.  An account of the data in need of clarification will be created.  Log entries will 
explain the issue and actions take for resolution.  Data and study team members involved in the 
clarification process will also be documented.  
9.4 
Records Retention 
 
The investigator will maintain records and essential documents related to the conduct of the 
study as outlined in the Mayo Clinic Research Policy Manual –“Access to and Retention of 
Research Data Policy” http://mayocontent.mayo.edu/research-policy/MSS_669717   IRB 
guidelines.  These will include subject case histories and regulatory documents. 
 
Any report, publication or other disclosure of clinical study outcomes will be done without 
subject identifiers.   
 
10 Study Monitoring, Auditing, and Inspecting 
10.1 Study Monitoring Plan 
 
The investigator will allocate adequate time for such monitoring activities.  The Investigator will 
also ensure that the monitor or other compliance or quality assurance reviewer is given access to 
all the study-related documents and study related facilities (e.g. pharmacy, diagnostic laboratory, 
etc.), and has adequate space to conduct the monitoring visit. 
 
10.2 Auditing and Inspecting 
The investigator will permit study-related monitoring, audits, and inspections by the IRB, the 
sponsor, and government regulatory agencies, of all study related documents (e.g. source 
documents, regulatory documents, data collection instruments, study data etc.).  The investigator 
will ensure the capability for inspections of applicable study-related facilities (e.g. pharmacy, 
diagnostic laboratory, etc.). 


 
 
 
 
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Participation as an investigator in this study implies acceptance of potential inspection by 
government regulatory authorities and applicable compliance offices. 
11 Ethical Considerations 
This study is to be conducted according to United States government regulations and 
Institutional research policies and procedures. 
 
This protocol and any amendments will be submitted to a properly constituted local Institutional 
Review Board (IRB), in agreement with local legal prescriptions, for formal approval of the 
study.  The decision of the IRB concerning the conduct of the study will be made in writing to 
the investigator before commencement of this study. 
 
All subjects for this study will be provided a consent form describing this study and providing 
sufficient information for subjects to make an informed decision about their participation in this 
study.  This consent form will be submitted with the protocol for review and approval by the IRB 
for the study.  The formal consent of a subject, using the Approved IRB consent form, must be 
obtained before that subject undergoes any study procedure.  The consent form must be signed 
by the subject or the subject’s legally authorized representative, and the individual obtaining the 
informed consent. For subjects under the age of 18 an additional assent form will be used.  The 
assent form will be submitted with the protocol for review and approval by the IRB for the study.   
 
12 Study Finances 
12.1 Funding Source 
 
Applications for funding will be submitted to the Mayo Clinic Center for Translational Science 
Activities (CTSA), Mayo Clinic Department of Pediatrics and Adolescent Medicine and Mayo 
Clinic Institutional Funds.     
12.2 Conflict of Interest 
 
Any study team member who has a conflict of interest with this study must have the conflict 
reviewed by a properly constituted Conflict of Interest Committee with a Committee-sanctioned 
conflict management plan that has been reviewed and approved by the study sponsor-investigator 
prior to participation in this study. 
12.3 Subject Stipends or Payments 
 
Subjects will receive $100.00 if the study is completed.  If the study is not completed the 
subjects will receive $25.00 for each of the two on-site study visits.   
 


 
 
 
 
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13 Publication Plan 
 
The Primary Investigator holds the primary responsibility for publication of the study results.  
 
14 References 
 
 
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Stewart, J.M., Chronic orthostatic intolerance and the postural tachycardia syndrome (POTS). 
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Wagner, A., et al., Catecholamines in adult iron deficiency patients. Experientia, 1979. 35(5): p. 
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Pinsk, V., et al., Efficacy and safety of intravenous iron sucrose therapy in a group of children with 
iron deficiency anemia. The Israel Medical Association journal : IMAJ, 2008. 10(5): p. 335-8. 


 
 
 
 
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22. 
Chandler, G., J. Harchowal, and I.C. Macdougall, Intravenous iron sucrose: establishing a safe 
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Sunder-Plassmann, G. and W.H. Horl, Safety aspects of parenteral iron in patients with end-
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Varni, J.W., M. Seid, and P.S. Kurtin, PedsQL 4.0: reliability and validity of the Pediatric Quality of 
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