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Laryngeal electromyography in multiple system atrophy with autonomic failure.
  1. G M Guindi,
  2. R Bannister,
  3. W P Gibson,
  4. J K Payne


    In five patients with multiple system atrophy, electromyographic studies using a new surface electrode technique, showed unequivocal evidence of denervation of the posterior crico-arytenoid muscle, and in three of them, of the interarytenoid muscle or crico-pharyngeal sphincter. By comparison, only minor electromyographic abnormalities were found in one-third of patients with other extra-pyramidal syndromes, though in two cases, the abnormalities were of a different kind from those found in multiple system atrophy.

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