alexa Botulinum treatment of spasticity: why is it so difficult to show a functional benefit?
Psychiatry

Psychiatry

Journal of Addiction Research & Therapy

Author(s): Sheean GL

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Abstract Clinical experience seems to indicate that botulinum toxin injections can, in selected patients with upper motor neurone syndrome, reduce spasticity and improve voluntary movement and active function. However, double-blind placebo-controlled trials have had difficulty showing active functional improvement, despite the clear ability of botulinum toxin to reduce spasticity. This prompts a re-analysis of the basic assumption that spasticity impairs voluntary movement and a review of the methodology of the clinical trials. Motor dysfunction is usually caused by weakness and the other "negative" features of upper motor neurone syndrome, rather than muscle overactivity. Recent research has explored the pathophysiological basis of the voluntary movement disorder, in particular the role of the various forms of motor overactivity, which might be amenable to botulinum toxin treatment. The failure of double-blind placebo-controlled clinical trials to show improvement in active function is, to a large extent, a result of their methodology, especially patient selection, injection protocols, and the choice of outcome measures. Clinical trials need to be re-designed and based upon expert experience and a better understanding of the pathophysiology of the motor disorder.
This article was published in Curr Opin Neurol and referenced in Journal of Addiction Research & Therapy

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