Safety and Efficacy of Lidoderm (Lidocaine Patch 5%) in Treating Moderate to Severe Pain Associated With Carpal Tunnel Syndrome

Study Overview
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Brief Summary
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The purpose of this study is to evaluate the analgesic efficacy and safety of the lidocaine patch 5% compared to placebo in patients with moderate to severe pain associated with carpal tunnel syndrome.

Detailed Description
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Patients with carpal tunnel syndrome (CTS)as determined by electrodiagnostic testing and moderate to severe pain will be randomized to receive either the lidocaine patch 5% or placebo patch q24h. The total duration of the double-blind treatment phase of the study will be 8 weeks. At baseline and at periodic visits to the clinic, patients will perform pain and functionality assessments. Patients with bilateral CTS will identify the index wrist (i.e., the more painful wrist), which will subsequently be the wrist used for all efficacy assessments throughout the study. Treatment Regimen and Route of Administration: Patients will apply one patch (either a lidocaine patch 5% or a matching placebo patch) to the volar aspect of each affected wrist once every 24 hours.

Official Title
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A Randomized, Double-Blind Study Comparing the Safety and Efficacy of the Lidocaine Patch 5% With Placebo in Patients With Pain From Carpal Tunnel Syndrome

Conditions
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Carpal Tunnel Syndrome

Intervention / Treatment
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* Drug: lidocaine patch 5%


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Are males or females 18 years of age or older Have confirmed diagnosis of CTS in one or both wrists. For patients with bilateral CTS, the most painful wrist will be identified as the index wrist, and will be the wrist used for all efficacy evaluations. Have clinical symptoms of pain, paresthesia, numbness and/or tingling in the distribution of the median nerve Have positive findings from electrodiagnostic tests using accepted criteria Have classification of the wrist(s) as classic or probable using the Katz Hand Diagram (Katz and Stirrat, 1990) Have worst daily pain intensity greater than 5 (0-10 scale) on approximately 75% of days over the previous 3 months; this criteria will be assessed at the screening visit only Have a normal 12-lead electrocardiogram (ECG) without any clinically significant abnormalities in heart rate, rhythm, or conduction Have been informed of the nature of the study and provided written informed consent Exclusion Criteria: Have a positive serum pregnancy test (females of childbearing potential only) Have tumors or cysts in the wrist, muscle wasting in the forearm and/or hand, peripheral neuropathy, mononeuropathy multiplex, or hand arthritis Have had previous CTS surgery Have severe CTS as defined by electrodiagnostic findings Have had steroid injections for CTS in the previous 3 months Have used diuretics (except a stable dose for hypertension) or Vitamin B6 or topical treatments for CTS (e.g., ultrasound, iontophoresis, cold laser) in the past 2 weeks Require sleep medications Are using a lidocaine-containing product that cannot be discontinued during the study Have a known sensitivity or allergy to an amide-type local anesthetic agent para-aminobenzoic (PABA) derivatives or local anesthetics Have previously participated in a Lidoderm study Have severe renal insufficiency (creatinine clearance of <30 mL/min) Have moderate or greater hepatic impairment, including a history of or active hepatitis Have abnormal clinical laboratory test results unless deemed clinically insignificant by the investigator Have current or planned litigation, or who are planning to acquire or are currently receiving Worker's Compensation or Social Security benefits, or who, in the opinion of the investigator, exhibit any evidence of secondary gain (monetary or non-monetary) associated with carpal tunnel syndrome pain. Have a history of alcohol or substance abuse within the last 3 years Have received an investigational drug or product or participated in an investigational drug study within a period of 30 days or 5 half-lives prior to receiving study drug

Ages Eligible for Study
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Minimum Age: 18 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Double


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Lidocaine Patch 5%<br>1 patch applied topically to the volar aspect of each affected wrist daily, 2-4 hours before bedtime. | Drug: lidocaine patch 5%<br>* 1 patch applied topically to the volar aspect of each affected wrist daily, 2-4 hours before bedtime<br>* Other names: Lidoderm;|
| Placebo Comparator: Placebo<br>1 patch applied topically to the volar aspect of each affected wrist daily, 2-4 hours before bedtime. | Drug: lidocaine patch 5%<br>* 1 patch applied topically to the volar aspect of each affected wrist daily, 2-4 hours before bedtime<br>* Other names: Lidoderm;|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Worst daily pain intensity score |  | Week 8 | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Average daily pain intensity score |  | Week 8 | 
| Levine CTS Symptom Severity and Functional Status Scales |  | Week 8 | 
| Mean interference with daily activities |  | Week 8 | 
| Intensity of Various Pain Qualities |  | Week 8 | 
| Quality of Sleep |  | Week 8 | 
| Global Assessment of Treatment Satisfaction and Impression of Change |  | Week 8 | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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lidocaine patch 5%, Lidoderm, carpal tunnel syndrome, pain, nerve compression injury, topical analgesic