Clinical trial NCT02322242
Conditions: Shoulder Surgery Nerve Block
Sponsor: Dr. Stephen Choi
Start date: 2015-01-01; Completion date: 2019-05-01
Enrollment: 182 participants; Allocation: RANDOMIZED; Intervention model: PARALLEL

Brief summary:
A standard interscalene nerve block is performed with long acting local anesthetic (bupivacaine or ropivacaine in concentrations varying from 0.25% to 0.75%). The purpose of this study is to investigate the effect of the addition of perineural dexamethasone (4mg) to a standard ropivacaine solution (0.5%) on analgesic duration of low dose interscalene block compared to ropivacaine alone for interscalene block with systemic dexamethasone.

Ropivacaine is not an intervention as a local anesthetic is pre-requisite to performing a nerve block.

Detailed description:
Interscalene brachial plexus block (ISB) is regarded as the standard of care for analgesia after shoulder surgery providing superior analgesia and reducing opioid consumption. Shoulder surgery, previously requiring inpatient admission for pain control, is now commonly performed on an ambulatory basis facilitated by ISB analgesia. The effects of single injection ISB dissipate after several hours unmasking the moderate to severe pain of the surgical insult and require strong opioid analgesia. Efforts to prolong ISB duration by increasing local anaesthetic (LA) dose are limited by their pharmacodynamics and narrow therapeutic window. To address some of these issues faced with prolonging ISB analgesia the addition of perineural adjuvants to local anesthetic (eg. clonidine, dexmedetomidine), have been investigated in an attempt to prolong peripheral nerve block duration with limited success. However, the corticosteroid dexamethasone, has been added to local anesthetic solutions for ISB and has demonstrated promise in preliminary studies. Perineural dexamethasone (8-10mg) in conjunction with local anesthetic prolongs the duration of ISB with an effect sizes ranging from 40% to 75% (absolute effect \~ 6 to 10 hours). Dexamethasone, however, is only approved for intramuscular or intravenous administration and therefore perineural use is currently off-label. There are several reasons that warrant a new randomized trial. Chiefly, all of the previous trials do not reflect modern regional anesthetic practice. These trials utilized peripheral nerve stimulation (PNS) and local anesthetic volumes of 30 to 40 ml. Modern ultrasound guided ISB (US-ISB) allows for more accurate, targeted deposition of local anesthetic with volumes ranging from 5 to 10 ml with no difference in block efficacy or duration compared to larger volumes (≥20ml). An ideal solution would be a local anesthetic with adjuvant mixture that allowed administration of lower volumes but with prolonged analgesic duration. The use of low dose local anesthetic with dexamethasone could be one such solution. A trial that demonstrates enhanced block quality and duration associated with perineural dexamethasone added to low dose local anesthetic may allow us to achieve both prolonged duration of effect and reduced side effects due to unwanted local anesthetic spread. This would create further significant benefits for patients and further promote the use of low dose local anesthetic techniques to anesthesiologists who do not currently use this technique.

Arms: arm 1: ISB performed with local anesthetic (ropivacaine 0.5%) and perinerual dexamethasone (4mg) arm 2: ISB with local anesthetic alone (ropivacaine 0.5%) alone and intravenous dexamethasone (4mg)
Interventions: intervention 1: Systemic Dexamethasone intervention 2: Perineural dexamethasone
Intervention descriptions: intervention 1: Intravenous infusion of dexamethasone (4mg) intervention 2: Perinerual administration of dexamethasone (4mg)

Protocol documents:
Prot_SAP_000.pdf: 
Version 9 October 25, 2015 
 
Comparison of the effects of perineural versus systemic dexamethasone on low dose Interscalene 
Brachial Plexus Block: A randomized trial 
 
Principal Investigator: 
Stephen Choi, MD, FRCPC 
Assistant Professor, University of Toronto 
Staff Anesthetist, Department of Anesthesia 
Sunnybrook Health Sciences Centre 
 
Co-Investigators: 
Alex Kiss, PhD 
Research Design and Biostatistics 
Sunnybrook Research Institute 
 
Paul McHardy, MD FRCPC 
Lecturer, University of Toronto 
Physician, Department of Anesthesia 
Sunnybrook Health Sciences Centre 
 
 


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2
 
A. 
Title:  
Comparison of the effects of perineural versus systemic dexamethasone on low dose Interscalene Brachial 
Plexus Block: A randomized trial 
B. 
Hypothesis 
Perineural dexamethasone added to the local anesthetic ropivacaine for low dose, ultrasound guided 
interscalene brachial plexus block (US-ISB) provides similar duration analgesia to that of US-ISB with local 
anesthetic alone and intravenous dexamethasone. 
C. 
Background and Rationale 
Interscalene brachial plexus block (ISB) is regarded as the standard of care for analgesia after shoulder 
surgery providing superior analgesia and reducing opioid consumption.1,2 ISB can have complications 
including ipsilateral phrenic nerve block resulting in diaphragmatic paralysis for the duration of the block 
which can result in temporary ventilatory compromise for patients with reduced respiratory reserve. 
Nonetheless, the benefits more often outweigh the risks in the appropriate patient population by 
reducing ventilatory depression associated with significant opioid use after painful upper extremity 
surgery. Shoulder surgery, previously requiring inpatient admission for pain control, is now commonly 
performed on an ambulatory basis facilitated by ISB analgesia. The effects of single injection ISB dissipate 
after several hours unmasking the moderate to severe pain of the surgical insult and require strong opioid 
analgesia. Efforts to prolong ISB duration by increasing local anesthetic (LA) dose are limited by their 
pharmacodynamics and narrow therapeutic window.  
 
A broad cross section of surgical patients consistently ranks postoperative pain as their highest concern 
highlighting the necessity for prolonged and effective postoperative analgesia.3,4 Strategies to prolong ISB 
analgesia include the placement of indwelling perineural catheters to allow for prolonged infusion. 


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Indwelling catheter techniques can be very effective and provide analgesia for several days but their utility 
is limited by technical challenges with placement, inherent secondary failure rate, and material cost.  
 
Furthermore, not all anesthetists have the subspecialty training required to perform advanced indwelling 
catheter techniques nor is there universal capability to administer and manage an outpatient perineural 
catheter program. Centres that do offer outpatient perineural catheter programs are limited by 
geography in terms of patient eligibility. To address some of these issues, the addition of perineural 
adjuvants to local anesthetic (eg. clonidine, dexmedetomidine), have been investigated in an attempt to 
prolong peripheral nerve block duration with limited success.5,6 The corticosteroid dexamethasone, has 
been added to local anesthetic solutions for ISB and has demonstrated promise in preliminary studies.7  
Several studies have demonstrated that perineural dexamethasone in conjunction with local anesthetic 
prolongs the duration of ISB with effect sizes that range from 40% to 75% (absolute effect ~ 6 to 10 hours) 
with perineural dexamethasone doses of 8 to 10mg.8-11 Postulated mechanisms of action for perineural 
dexamethasone include attenuating the release of inflammatory mediators, reducing ectopic neuronal 
discharge, and inhibiting potassium channel mediated discharge of nociceptive C-fibres.12-14  
 
Dexamethasone, however, is only approved for intramuscular or intravenous administration by Health 
Canada and therefore perineural use is currently off-label.  Numerous studies have documented 
perineural use of dexamethasone without increased incidence of persistent neuropathy. Some concern 
was expressed with the preservative (sodium bisulfite) in multidose vials causing neurotoxicity. Specific 
toxicity studies in rat models have documented no histologic changes in nerves when sodium bisulfite 
(preservative) is directly applied to the nerve at pH7 and a concentration of 0.2% (concentration in 
commercial preparations of dexamethasone 0.1%).15 In addition perineural corticosteroid administration 


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for chronic pain applications (e.g. epidural steroid injection) has a long history of safe administration 
without evidence of neurotoxicity.16 
 
There are several reasons that warrant a new randomized trial. Chiefly, all of the previous trials do not 
reflect modern regional anesthetic practice. These trials utilized peripheral nerve stimulation (PNS) and 
local anesthetic volumes of 30 to 40 ml.8-11 Modern ultrasound guided ISB (US-ISB) allows for more 
accurate, targeted deposition of local anesthetic with volumes ranging from 5 to 10 ml with no difference 
in block efficacy or duration compared to larger volumes (≥20ml).17-20 Despite this, critics of low volume 
US-ISB persist with the belief that low-volume techniques, with their reduced local anesthetic dose, 
inherently produce a shorter duration block of lesser quality compared to higher volume. However by 
advocating for higher volume ISB, practitioners guarantee diaphragmatic dysfunction from ipsilateral 
phrenic nerve block (near 100% with volume ≥10ml). An ideal solution would be a local anesthetic with 
adjuvant mixture that allowed administration of lower volumes but with prolonged analgesic duration. 
The use of low dose local anesthetic with dexamethasone could be one such solution.  A trial that 
demonstrates enhanced block quality and duration associated with perineural dexamethasone added to 
low dose local anesthetic may allow us to achieve both prolonged duration of effect and reduced side 
effects due to unwanted local anesthetic spread. This would create further significant benefits for patients 
and further promote the use of low dose local anesthetic techniques to anesthesiologists who do not 
currently use this technique. 
 
Secondly, there is some data to suggest that systemic dexamethasone may also prolong block duration.9 
The most recent trial failed to show a difference in block duration between systemic and perineural 
dexamethasone. The conclusions of this trial were that the two modes of administration were equivalent 


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at prolonging block duration. This was methodologically incorrect, as the trial was not specifically 
designed as an equivalency trial with defined equivalency margins.  
 
Our trial will add to the literature by determining if systemic dexamethasone is equivalent to perineural 
dexamethasone in terms of block duration with a properly designed equivalence trial. Should systemic 
dexamethasone be equivalent to perineural dexamethasone, anesthesiologists will not have to utilize 
dexamethasone off-label. Should the two administration modalities not be equivalent, anesthesiologists 
will be able to make informed decisions about its use. 
 
D. 
Specific Objective 
To investigate the effect of the addition of perineural dexamethasone (4mg) to ropivacaine on analgesic 
duration of low dose interscalene block compared to ropivacaine alone for interscalene block with 
systemic dexamethasone. 
 
E. 
Methods 
i. 
Inclusion Criteria/Sample population 
1. Patients undergoing arthroscopic shoulder surgery 
2.   ASA functional status class I to III 
3.  Age 18 to 80 years 
4.  BMI ≤ 35 kg/m2 
ii. 
Exclusion Criteria 
1.  Lack of patient consent (including: inability to read or understand the ICF) 
2.  Allergy to dexamethasone or ropivacaine 
3. BMI > 35 kg/m2 


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6
4. Contraindications to low dose dexamethasone including peptic ulcer disease, systemic 
infection, glaucoma, active varicella/herpetic infections, diabetes mellitus 
5. Contraindications to ISB including severe Chronic Obstructive Pulmonary Disease (Forced 
expiratory volume < 40% predicted), coagulopathy, pre-existing neurologic deficit in ipsilateral 
upper extremity, localized infection 
6.  Pregnant or nursing females 
7. Chronic opioid use defined as > 30mg oral morphine or equivalent per day 
8. Unable to take acetaminophen or celecoxib 
 
iii. 
Protocol 
Patients scheduled for arthroscopic shoulder surgery will be approached for participation by research 
assistants in the pre-operative anesthetic clinic. Patients providing informed consent will be allocated 1:1 
in blocks of 10 using a computer generated random number table (randomization will be stratified by site) 
and blinding of group allocation will be maintained with sequentially numbered, sealed, opaque 
envelopes. 
The following paragraph outlines standard of care practice (unless otherwise stated) for patients 
undergoing arthroscopic shoulder surgery at HoAC: 
On the day of surgery, patients will be pre-medicated with oral acetaminophen 1000mg, and oral 
celecoxib 400mg, unless otherwise stated by the attending physician. Once intravenous access is secure 
and standard monitors applied (electrocardiogram, non-invasive blood pressure cuff, continuous oxygen 
saturation), patients will receive sedation with intravenous midazolam (1-2mg). The lateral aspect of the 
neck including the supraclavicular fossa ipsilateral to the surgical site will be cleansed with standard 
isopropyl alcohol/chlorhexidine gluconate solution. The US-guided ISB will be performed under sterile 
conditions by a staff regional anesthesiologist, regional anesthesia fellow, or residents under supervision. 


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The ISB will be performed using a 13-6 MHz 38-mm linear US probe with appropriate sterile barrier (M-
Turbo®; SonoSite Inc., Bothell, WA) at the C6 nerve root level via posterior approach with a 22-gauge 
insulated 50-mm regional block needle (Stimuplex®; B.Braun Medical, Bethlehem, PA). After satisfactory 
position of the needle tip is achieved and visualized, the injectate will be administered slowly. The total 
volume injected is 6 ml to allow for the 1 ml of dead space in the block needle line and needle itself. 
Control 
Experimental 
Ropivacaine 1% 3.5 ml + 0.9% saline 3.5 ml, 
total volume 7.0ml, final concentration 0.5% 
ropivacaine 
Intravenous infusion D5W with 
dexamethasone 4mg, 50 ml to be infused over 
15 minutes 
Ropivacaine 1% 3.5 ml + 0.9% saline 2.5 ml, 
0.4% dexamethasone 1.0 ml, total volume 7.0 
ml, final concentration 0.5% ropivacaine, 
dexamethasone 4mg 
Intravenous infusion D5W, 50ml 
 
Dexamethasone has been sourced from Sandoz which contains sodium bisulfite, but not the preservative 
benzyl alcohol which is present in other preparations. The local anesthetic injectate will be prepared in a 
blinded syringe by trained block room nurses that are aware of group allocation but will take no further 
part in study procedures or assessments. This individual will prepare the injectate in a 10ml syringe 
labelled as followed 'ropivacaine 0.5% +/- dexamethasone 4mg' as well as the intravenous infusion 
labelled ’saline placebo or dexamethasone 4mg’. All other personnel - patients, anesthesiologists 
performing the ISB or caring for the patient in the operating theatre, anesthesia assistants, surgeons, 
research assistants performing outcome measures, and statisticians - will remain blinded.  
 
The following two paragraphs outline standard of care practice (unless otherwise stated) for patients 
undergoing arthroscopic shoulder surgery at HoAC:  
Patients will undergo general anesthesia with a standardized induction technique using fentanyl 1 -
4mcg/kg, and propofol 1-3mg /kg both at the discretion of the attending anesthesiologist and titrate to 
effect.  Endotracheal intubation will be facilitated with rocuronium 0.6-1.0mg/kg if necessary or a 


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laryngeal mask airway can be placed for spontaneously breathing patients. Anesthesia will be maintained 
using the inhalational anesthetic sevoflurane (AbbVie) with an end-tidal concentration of 1.4 - 2%. The 
surgeon will infiltrate the arthroscopic port insertion sites with 10-40ml total volume of bupivacaine 
0.25% (1:200,000 epinephrine) or lidocaine (as determined by the attending physician). Muscle relaxation 
will be reversed using a combination of neostigmine (0.04mg/kg) and glycopyrrolate (0.007mg/kg) if 
necessary. Standard anti-emetic prophylaxis with the serotonin antagonist ondansetron (4mg) will be 
given. For the purpose of this study, patients will not receive additional dexamethasone regardless of 
group allocation. 
 
Upon arrival to the recovery room, pain (Verbal Response Score ³4 or patient request for analgesia) will 
be treated with intravenous hydromorphone (solely for this study) in 0.2-0.4mg increments every 5 
minutes as needed. Postoperative nausea will be treated (as needed) with an additional dose of 
ondansetron (1mg), droperidol (0.625mg), dimenhydrinate (50mg) or prochlorperazine at the discretion 
of the attending physician. Capillary blood glucose will also be assessed and recorded for this study. Once 
oral intake is initiated, patients will receive one of several analgesic preparations as needed: Tylenol #3® 
(acetaminophen 325 mg/codeine 30 mg/caffeine 15 mg per tablet), or oxycocet (acetaminophen 325 
mg/oxycodone HCl 5 mg per tablet), oxycodone 5-10 mg, or hydromorphone 2-4 mg if intolerant to 
codeine at the discretion of the attending physician. Upon discharge from hospital, patients will receive a 
prescription for Tylenol #3® as needed, or hydromorphone or oxycocet if intolerant to codeine at the 
discretion of the attending physician. 
 
After discharge, patients will complete a home pain diary with information that will be collected by 
research personnel during postoperative telephone calls. Patients will be asked to record the time at 
which they first experience pain at the surgical site, the time when they first consumed prescribed opioid 


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analgesics for surgical site pain and when they regained preoperative baseline hand strength. 
Postoperatively patients will be requested to document interval oral analgesic consumption, presence of 
nausea or vomiting, presence of weakness in the operative arm, and presence of paresthesia (numbness 
or tingling) in the operative arm. The doses of oral codeine, hydromorphone, or oxycodone consumed by 
each patient will be converted into equianalgesic doses (oral morphine equivalents). Conversion ratios will 
be employed according to the general monograph for opioids in the Canadian Pharmacists’ Association 
Compendium of Pharmaceuticals and Specialties (36th ed., 2001) as follows: oral oxycodone: oral 
morphine sulphate = 1:1.5, oral hydromorphone:oral morphine sulphate = 1:5, and oral codeine: oral 
morphine sulphate = 6.6:1. The Opioid conversion table has been appended to this protocol. 
All patients will be followed-up by telephone on post operative days 1 and 7 (+/- up to 5 days depending 
on patient availability) to collect the following study data: NRS pain scores, onset of pain and return of the 
affected hand to normal strength; side effects or complications experienced [(e.g. paresthesia - numbness 
or tingling, infection at ISB site) in the operative arm, and whether the numbness or tingling was located 
distal or proximal to the operative site]; and, the quantity, frequency and onset of opioid consumption. 
Additional information will not be asked, however if an adverse event (AE) was mentioned during 
telephone follow-up visits, this will be documented in the AE log and assessed accordingly by the QI. 
Additional follow-up telephone visits may be conducted as required in the event of a Serious Adverse 
Event (SAE) or Adverse Reaction (AR) and will be reported in accordance with the Site Guidance on Safety 
Reporting document  
 
iv. 
Primary Outcome 
• 
Duration of sensory block – defined as time from end of injection to first sensation of pain 
at surgical site 
 
v. 
Secondary Outcomes 


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10
• 
Time to first opioid consumption – from end of injection to time to first oral opioid 
consumption 
• 
Duration of motor block - from end of injection to time of baseline preoperative biceps 
and hand strength 
• 
Oxygen saturation on room air 1 hour after arrival to recovery room 
• 
Opioid consumption on POD 1 at 12 hours/bed time if patient retires to bed before the 
12hr time point), 24 hours and 7 days 
• 
NRS for pain at 12hrs/Bed time (if patient retires to bed before the 12hr time point), 
24hours, 7 days 
• 
Blood glucose in recovery room 
• 
Persistent paresthesia in the operative arm at 7 days 
• 
Localized infection at block site at 7 days 
• 
Postoperative nausea 
 
vi. 
Sample size calculation 
Based on our clinical experience with low dose US-ISB (ropivacaine 0.5% 5ml) as well as previously 
published work, we expect mean sensory block duration of 12 hours with a standard deviation of 4 hours. 
Based on the literature, we expect a mean prolongation of block time associated with perineural 
dexamethasone to be approximately 50% thereby increasing block duration to 18 hours. Defining an 
equivalency margin of 2 hours, we estimate that 87 patients per group (174 total) will be required to 
reliably test our hypothesis given α=0.05 and β=0.9. To account for incomplete data or loss to follow-up, 
the plan is to recruit 90 patients per group (180 total). 
vii. 
Statistical analysis 
Demographic data will be summarized and expressed using appropriate measures of central tendency and 
dispersion for continuous data, means and standard deviations will be provided (medians and 
interquartile ranges for non-normally distributed data) and for categorical data counts and percentages 
will be displayed. The primary outcome, time to first sensation of pain at the surgical site, will be 
compared between the two groups using a two sample equivalence test of means. Secondary outcomes 
that are time based will also be assessed in the above manner (time to first analgesic request, duration of 
motor block). Continuous secondary outcomes (opioid consumption, NRS) will be assessed with repeated 
measures ANOVA while blood glucose will be assessed with the t-test. Categorical outcomes (paresthesia, 


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infection, nausea) will be compared with the Chi square or Fisher's exact test for the case of low expected 
cell counts. 
viii. 
Trial conduct and Data collection/management 
The coordinating centre for this trial will be Sunnybrook Health Sciences Centre where the study 
coordinator and central data clerk will be based. A physician lead will be available at SHSC to answer 
patients’ questions about the study as well as acting as a resource for the site specific study coordinator 
regarding patient eligibility and education of required hospital staff. The master randomization list will be 
kept at SHSC. 
 
Data will be collected on a customized case report form (CRF) that includes all relevant demographic and 
intra-operative data as well as each outcome sought. Patients will be provided with a home diary to 
complete that will capture all outcomes sought that are not obtained in hospital. CRFs and home diaries 
will be completely de-identified with only patient study number, age (in years), and gender as identifiers. 
Data from the CRFs will be entered into a database at each site on secure, password protected computers 
with hospital network backup.  The master file linking identifying data (name, MRN, date of birth) and 
study number will be kept in a separate file on a secure, password protected computer with hospital 
network backup.  
 
CRFs will be divided into 2 categories: “CRFs” and “Source-CRFs”. “Source-CRFs” are the documents used 
by the RA or patient to directly capture study data. They include: the pain diary, side effect questionnaires 
and the sensory and motor block assessments. “CRFs” will be completed with data transcribed from a 
source document. They include: Preoperative details, intra-operative data collection and medication 
administered in the Post Anesthesia Care Unit (PACU) and Day Surgical Unit (DSU) all obtained from 
medical records. 


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12
 
Data collection plan 
Data will be collected according to the Source-CRFs/CRFs. All data collection will be conducted by a 
research staff member, either a research assistant or a co-investigator, who is blinded to the patient’s 
treatment allocation.  
1. Identifying information, exclusion criteria, surgical procedure description and anesthesia data will 
be collected preoperatively. 
2. Procedure details, including: sedative used, procedure duration (end of injection), pain on 
injection and the presence of blood will be collected during the block procedure. 
3. Pinprick sensation in the C4-T1 dermatomes at 10 and 20 minutes post block (to characterize 
presence/absence of block). Pain Sensation is characterized as a: (2) = sharp sensation, (1) = dull 
sensation only, or (0) = no sensation. 
4. Motor function (elbow flexion for biceps) at 10 and 20 minutes post block. Power is graded using 
(2) = normal movement, (1) = reduced movement and (0) = no movement. 
5. Intra-operative anesthesia data collection. Time of first Incision, administered anesthesia and time 
procedure ended. 
6. Room air pulse oximetry 1 hour after admission to PACU/recovery room (to characterize 
respiratory function near discharge)  
7. Blood Glucose level in PACU. 
8. An account of analgesia administered in PACU. 
9. Numerical rating scale (NRS) pain scores 1 hour after admission to PACU to PACU/recovery room 
10. Information regarding post block complications (including pain and bruising around the block site) 
will be collected in a 1 week postoperative telephone call with the patient.  
11. Time to first pain sensation in the shoulder, analgesic use and return of the affected hand to 
normal strength will be captured in the take home patient diary and reported at follow-up 
telephone calls. 
12. NRS pain scores, analgesia consumption and side effects experienced will be captured at: 
12hours/bed time, 24 hours and 7 days post-operatively in the patient’s diary reported at follow-
up telephone calls. 
 
Upon achieving enrolment of the specified 180 patients and data is collected, the database will be 
verified, and analyzed by the biostatistician. 
ix. 
Data safety monitoring plan 
This study involves the off-label use of dexamethasone. Consequently, an application to Health Canada 
will be made to obtain regulatory approval for the use of perineural dexamethasone. All adverse events 
will be documented (serious or not, related or not, expected or not) and reported following the Site 


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13
Guidance on Safety Reporting document. Serious adverse events are not expected. The severity of the 
adverse event will be coded as mild, moderate, or severe. The association with the intervention will be 
coded as unrelated, unlikely related, possibly related, probably related, or definitely related. The principal 
investigator will review all adverse events and act as safety monitor. These will be communicated to 
Health Canada and the Research Ethics Board of each respective institution. The independent reviewers 
will determine if the off-label use of dexamethasone contributed in any way to the adverse event and will 
make recommendations to either terminate, or modify study protocols. 
 
The following are potential side effects often associated with surgical procedures that are not considered 
adverse events related to this study (obtained confirmation from five other physicians who declare no 
conflict of interest) and will therefore not need to be assessed and recorded by the QI in cases where 
these side effects are reported by study patients while they are in hospital and at home during post-
operative follow-up telephone interviews: 
• 
Headache/dizziness/nausea/vomiting/wheezing 
• 
Bruising in the arm 
• 
Gritty feeling in the eye/blurred vision/mild visual disturbance 
• 
Bradycadia/tachycardia 
• 
Complications associated with general anesthesia such as major cardiac events 
• 
Local anesthetic toxicity 
• 
Hemidiaphragmatic paresis (temporary) 
• 
Hoarse voice (temporary) 
• 
Horner’s syndrome (temporary) 
• 
Pruritus 
• 
Changes in blood pressure 
• 
Oxygen saturation below 90% 
• 
Pain, cellulitis, or muscle spasm in areas other than the nerve block injection 
 
 
A single interim analysis will be performed at 50% enrolment. If the data analysis indicates 
equipoise no longer exists, the study will be stopped early. The Haybittle-Peto threshold will be utilized 
(p=0.001). 
F. 
Significance/implications 
 
 
 
 
 
 
 
 


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This trial will have a positive impact by determining whether perineural dexamethasone is truly equivalent 
to systemic dexamethasone in terms of prolonging ISB duration. If the two modalities of administration 
are equivalent, then anesthesiologists will not have to administer an off-label medication and achieve 
similar results with the standard indication for dexamethasone, prophylaxis for post-operative nausea and 
vomiting. Secondly, this will allow anesthesiologists to gain confidence in low-volume techniques that may 
decrease the incidence of respiratory complications in patients receiving ISB without compromising 
analgesic benefits. 
G. 
Investigators 
The investigators have extensive experience performing regional block procedures as well as numerous 
peer reviewed publications and successful grant application. Investigators at each site have dedicated 
academic time to ensure completion of the project. The principal investigator (SC) has completed a post-
graduate degree with training in epidemiology and the conduct of multi- centre randomized trials.  


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