Effects of local injections of botulinum toxin on electrophysiological parameters in patients with hemifacial spasm: role of synaptic activity and size of motor units

  • Glocker F
  • Guschlbauer B
  • Lucking C
 et al. 
  • 4


    Mendeley users who have this article in their library.
  • 18


    Citations of this article.


Ten patients with typical hemifacial spasm were examined before and after treatment with local injections of botulinum toxin type A. After a mean follow-up period of 38 days there was a reduction of the compound muscle action potential (CMAP) of the injected orbicularis oculi muscle of 40%. Ephaptic transmission studied by selective stimulation of facial nerve branches revealed a preserved delayed response of the affected mentalis muscle. However, no delayed response could be recorded in the injected orbicularis oculi muscle in nine patients. The discrepancy between complete loss of the delayed (ephaptic) response and only moderate reduction of the CMAP amplitude of the direct response may be explained by preferential uptake of botulinum toxin type A by hyperactive synapses involved in ephaptic transmission. © 1995.

Author-supplied keywords

  • Botulinum toxin
  • Ephaptic transmission
  • Facial nerve
  • Hemifacial spasm
  • Neurography

Get free article suggestions today

Mendeley saves you time finding and organizing research

Sign up here
Already have an account ?Sign in

Find this document


Cite this document

Choose a citation style from the tabs below

Save time finding and organizing research with Mendeley

Sign up for free