Abstract
Therapeutic reduction of the activity of the deep digital flexor (DDF) muscle may play a role in treatment of laminitic horses. Clostridium botulinum toxin type A induces reduced muscle activity and has a spasmolytic effect in horses. In this study, the effectiveness of 200IU C. botulinum toxin type A on reduction of DDF muscle activity was measured in seven healthy, sound, adult Royal Dutch sport horses. C. botulinum toxin type A was injected using ultrasound and electromyographic (EMG) guidance. The effectiveness was assessed by interference pattern analysis (IPA) and motor unit action potential (MUAP) analysis. All needle EMG MUAP variables, along with IPA amplitude/turn and turns/s, were significantly reduced after C. botulinum toxin type A injections. The strongest effect occurred within the first 3days after injection. The reduced muscle induced by C. botulinum toxin type A may have benefits in the treatment of horses with laminitis.
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