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Dramatic changes in muscle contractile and structural properties after 2 botulinum toxin injections
Viviane B Minamoto1, Kentaro P Suzuki1, Shannon N Bremner1
1Department of Orthopaedic Surgery, University of California San Diego, La Jolla, California, USA.
Repeated onabotulinum toxin (BoNT) injections significantly amplify muscle paralysis effects compared to single doses. Serial BoNT administration results in over 95% torque reduction, indicating a potent cumulative impact on muscle function.
Area of Science:
- Neurology
- Muscle Physiology
- Pharmacology
Background:
- Botulinum toxin (BoNT) is widely used for therapeutic muscle paralysis.
- The long-term effects of serial BoNT administrations on muscle function remain under-investigated.
Purpose of the Study:
- To characterize the muscle response to repeated onabotulinum toxin (BoNT) injections.
- To compare the effects of single versus double BoNT injections on muscle function.
Main Methods:
- Animal models were utilized to assess muscle response.
- Groups received either a single BoNT injection, two BoNT injections (3 months apart), or one BoNT and one saline injection.
Main Results:
- Two serial BoNT injections produced a disproportionately greater functional deficit than a single injection.
- Single BoNT injections decreased leg torque by ~50%, while double injections decreased it by >95% relative to baseline.
- Both single and double BoNT injections induced fiber-type grouping.
Conclusions:
- Repeated onabotulinum toxin (BoNT) injections exhibit a significantly amplified effect on muscle paralysis.
- The cumulative impact of serial BoNT administration on muscle function is substantial.
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