- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT00689585
Safety and Efficacy Study of Ethosuximide for the Treatment of Complex Regional Pain Syndrome (CRPS)
A Single Centre. Parallel-Group, Double-Blinded, Randomized, Placebo-Controlled Pilot Clinical Trial on Ethosuximide for the Treatment of Complex Regional Pain Syndrome (CRPS)
Study Overview
Status
Conditions
Intervention / Treatment
Detailed Description
This is a single centre, parallel-group, double-blind, randomized, placebo-controlled pilot clinical trial for adults suffering from complex regional pain syndrome (CRPS).
Twelve (12) subjects diagnosed with CRPS will be enrolled and randomized to receive orally, either ethosuximide or placebo. If the maximum trial medication dosage (1500mg) is reached, the subject will be in the study for a maximum of 10 weeks from screening (Clinic Visit 1) to the end of the drug cessation period. The minimum period a subject could complete the study would be 4 weeks presuming they were not previously on any disallowed drugs and only found the 500mg dose tolerable.
Study Type
Enrollment (Actual)
Phase
- Phase 2
Contacts and Locations
Study Locations
-
-
Quebec
-
Montreal, Quebec, Canada, H3G 1A4
- McGill University Health Centre
-
-
Participation Criteria
Eligibility Criteria
Ages Eligible for Study
Accepts Healthy Volunteers
Genders Eligible for Study
Description
Inclusion Criteria:
- Male or female, age ≥18 years old;
- Diagnosis of Complex Regional Pain Syndrome (CRPS) using International Association for the Study of Pain criteria >6 months;
- Normal liver function (AST level <3x normal level);
- Normal kidney function (serum creatinine <133µmol/L);
- Full blood count, haematocrit >38%;
- Willing and able to give informed consent and of completing study questionnaires;
- Stable (no change in past two months) but suboptimal pain pharmacotherapy (i.e. additional pain control felt by patient and physician to be necessary);
- Able to attend research centre according to the visit schedule;
- Women of child-bearing potential must be using a reliable form of contraception i.e. oral contraceptives, a barrier method (condom or diaphragm), intra-uterine device or abstinence.
Exclusion Criteria:
- Optimal response to opioids, antidepressants, anticonvulsants or anti- inflammatory medications;
- Any history or indication of kidney or liver disease;
- Any history of alcohol abuse;
- Presence of diabetes;
- Subjects taking other anti-epileptic drugs, including gabapentin, pregabalin, topiramate, phenytoin, carbamazepine, and oxcarbazepine;
- Pregnancy (a serum bHCG pregnancy test will be performed as part of the initial blood panel);
- Known or suspected allergy to succinimides, ethosuximide, methsuximide (Celontin®), phensuximide;
- Any history of mental illness or disorder, which in the investigators opinion, interferes with the subjects ability to accurately report treatment response;
- Participation in other clinical trial in the 30 days prior to enrolment.
Study Plan
How is the study designed?
Design Details
- Primary Purpose: TREATMENT
- Allocation: RANDOMIZED
- Interventional Model: PARALLEL
- Masking: QUADRUPLE
Arms and Interventions
Participant Group / Arm |
Intervention / Treatment |
---|---|
EXPERIMENTAL: 2
|
500-1500mg/day over a 1-5 week dose titration period until maximal tolerated dose (MTD) attained, followed by 1 week MTD plateau period.
Other Names:
|
PLACEBO_COMPARATOR: 1
|
250mg matching placebo capsules
|
What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Maximum tolerated dose (500mg-1500mg per day) and Safety profile
Time Frame: up to 10 weeks
|
Primary outcomes will consist of the dose attained during the study and the safety (adverse event) profile.
Maximum timeframe on study drug is 6 weeks.
Adverse events will be collected up to one month after the trial period ends.
|
up to 10 weeks
|
Secondary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Pain Intensity Scores on the Visual Analogue Scale (VAS)
Time Frame: up to 7 weeks
|
Pain Intensity captured on Day 1 (First study visit post-disallowed drug cessation period) and 7 days after maximal-tolerated dose attained (Final Study Visit)
|
up to 7 weeks
|
Pain Intensity Scores on the Numerical Rating Scale (NRS)
Time Frame: up to 5 weeks
|
Pain Intensity using the Numerical Rating Scale will be captured by telephone every week during dose titration period (Days 3 and 6).
|
up to 5 weeks
|
Neuropathic Pain Symptom Inventory (NPSI)
Time Frame: up to 7 weeks
|
Day 1 (First study visit post-disallowed drug cessation period) and 7 days after maximal-tolerated dose attained (Final Study Visit)
|
up to 7 weeks
|
Short Form 12v2 (SF-12v2)
Time Frame: up to 7 weeks
|
Quality of Life measured on Day 1 (First study visit post-disallowed drug cessation period) and 7 days after maximal-tolerated dose attained (Final Study Visit)
|
up to 7 weeks
|
Short Form McGill Pain Questionnaire (SF-MPQ)
Time Frame: up to 7 weeks
|
Day 1 (First study visit post-disallowed drug cessation period) and 7 days after maximal-tolerated dose attained (Final Study Visit)
|
up to 7 weeks
|
Collaborators and Investigators
Collaborators
Investigators
- Principal Investigator: Mark A Ware, MD, McGill University Health Centre/Research Institute of the McGill University Health Centre
Study record dates
Study Major Dates
Study Start
Primary Completion (ACTUAL)
Study Completion (ACTUAL)
Study Registration Dates
First Submitted
First Submitted That Met QC Criteria
First Posted (ESTIMATE)
Study Record Updates
Last Update Posted (ESTIMATE)
Last Update Submitted That Met QC Criteria
Last Verified
More Information
Terms related to this study
Keywords
Additional Relevant MeSH Terms
Other Study ID Numbers
- GEN#07-062
This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.
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