Botulinum toxin type B blocks sudomotor function effectively: a 6 month follow up

Area of Science:

• Dermatology
• Neurology
• Physiology

Background:

• Botulinum toxin type B is used for various medical applications.
• Understanding its effects on sudomotor function is crucial for therapeutic use.

Purpose of the Study:

• To investigate the efficacy and duration of sweat gland suppression by botulinum toxin type B.
• To determine the dose-response relationship for botulinum toxin type B in inhibiting sweat production.

Main Methods:

• 15 healthy volunteers received subcutaneous injections of botulinum toxin type B in their lower legs.
• Sweat tests were performed using iodine-starch staining and quantitative sudomotor axon reflex test (QSART) at baseline and at 3 weeks, 3 months, and 6 months post-injection.
• Carbachol iontophoresis was used to stimulate sweat production for QSART analysis.

Main Results:

• A threshold dose of 8 mouse units induced anhidrotic skin spots (>4 cm2) within 3 weeks.
• Higher doses (15 and 125 mouse units) prolonged anhidrosis for 3 and 6 months, respectively.
• QSART scores significantly decreased, with near-complete suppression at doses of 62.5 mouse units or higher.
• Partial recovery of sweat function was observed at the edges of anhidrotic areas over time, with complete recovery by 6 months.

Conclusions:

• Botulinum toxin type B effectively suppresses sudomotor function in a concentration-dependent manner.
• The duration of sweat suppression is directly related to the injected dose.
• Botulinum toxin type B demonstrates potential for managing hyperhidrosis or other conditions involving excessive sweating.