Study to Assess the Efficacy of Botulinum Toxin B (Myobloc) for the Treatment of Prosthesis-associated Sweating

Study Overview
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Brief Summary
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The objective of this study is to determine if Myobloc significantly decreases prosthesis-associated symptomatic sweating in amputees when compared to a saline solution placebo. The study is randomized, double-blind, placebo-controlled, crossover trial with a total enrollment of 32 amputee subjects.

Detailed Description
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Patients with amputations experience severe sweating due to sockets and liners used with fitted prostheses. This excessive sweating causes inadequate fitting and function of the prosthesis as well as discomfort. The treatment modality and techniques used are based upon a successful prior open-labeled pilot study done by this research group investigating the effect of Botulinum Toxin A (BOTOX) on residual limb hyperhidrosis, which demonstrated significant decreases in sweating in amputees with residual limb hyperhidrosis treated with BOTOX. Each subject will undergo baseline testing consisting of 15 minutes of walking on a treadmill (or using a handcycle) at light exertion (11 on the Berg scale). They will report the effect of sweating on their prosthesis fit and function over the past month, and the amount of sweat produced in the 15 minutes will be measured via gravimetric assessment. At the end of the baseline session, subjects receive either the drug or placebo by injection into the residual limb area they identify as being the most troublesome for sweating. Subjects return for a 1-month follow-up session where the questionnaire, walking test, and sweat collection are re-administered. At the one-month follow-up session, subjects who received the placebo and felt it was not successful in decreasing their sweating are given the opportunity to cross-over into the drug arm of the trial.

Official Title
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Randomized, Double-blind, Placebo-controlled Trial to Assess the Efficacy of Botulinum Toxin B (Myobloc) for the Treatment of Prosthesis Associated Symptomatic Sweating, or Residual Limb Hyperhidrosis in Amputees

Conditions
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Hyperhidrosis

Intervention / Treatment
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* Drug: Botulinum Type B
* Drug: Placebo


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Male or female, 18-50 years of age, active duty or retired military Limb amputation (single or multiple:for lower extremity amputees, amputation at the ankle or above; for upper extremity amputees, amputation at the wrist or above) Clear history of excessive sweating in a residual limb that is interfering with prosthesis fitting and functioning. This will be defined as focal, visible sweating in the region of the residual limb with at least one of the following characteristics: impairs prosthesis fitting, impairs functioning with a limb prosthesis Negative urine pregnancy test prior to the administration of study medication (for females) Exclusion Criteria: Age less than 18 or greater than 50 Any medical condition that may put the participant at increased risk with exposure to Myobloc, including diagnosed myasthenia gravis, Eaton-Lambert syndrome, amyotrophic lateral sclerosis/motor neuron disease, neuropathy, renal stones, or any other disorder that may interfere with neuromuscular function Females who are pregnant, breast feeding, or planning a pregnancy during the study, or who think they may be pregnant at the start of the study Known allergy or sensitivity to any of the components in the study medication Known sensitivity to human albumin or albumin transfusions Current or planned use of aminoglycosides Systemic medical conditions (such as thyroid disease, hypertension, bleeding disorders, diabetes, cancers, etc.) that are not currently medically managed or controlled Current or planned use of a myoelectric prostheses (for upper extremity amputees), as the potential for weakness caused by botulinum toxin could interfere with muscle contraction Concurrent participation in another investigational drug or device study, or participation in the 30 days immediately prior to study enrollment Any condition or situation, in the investigator's opinion, that may put the participant at significant risk, confound the study results, or interfere significantly with the participant's ability to participate in the study Any previous use of Myobloc, Dysport, or BOTOX

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 50 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

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: Botulinum Type B (Myobloc)<br>Each vial of active drug will contain 5000 unit/ml of Myobloc, with a total volume of 1 mL. The injections will be spaces 6 cm apart and will cover the entire area to be injected. Each site will receive a volume of 0.08 ml (400 units). | Drug: Botulinum Type B<br> <br> * Other names: Myobloc;|
| Placebo Comparator: Saline solution<br>The volume to be injected will be calculated assuming the injectate is an active drug, and will therefore be an equivalent volume as an active drug (i.e. 0.08 mL per injection site with a 6 cm spacing interval) | Drug: Placebo<br> <br> |

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Amount of sweating | The amount of sweating will be assessed via gravimetry, which is an accepted method for determining sweating in a particular area. This method involves covering the area of the residual limb in question with filter paper for five minutes. After five minutes, the filter paper is removed and weighed. The weight of the dry filter paper is subtracted to give the approximate weight of the sweat produced. This study will use the total weight of sweat produced as a method of objectively quantifying the amount of sweating in the residual limb. Gravimetry will be used as a measure of change from pre-treatment to post-treatment. | one month after initial injection | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Hyperhidrosis, Botulinum Toxin, Amputation, Phantom limb pain