RT Journal Article SR Electronic T1 Laryngeal electromyography in multiple system atrophy with autonomic failure. JF Journal of Neurology, Neurosurgery & Psychiatry JO J Neurol Neurosurg Psychiatry FD BMJ Publishing Group Ltd SP 49 OP 53 DO 10.1136/jnnp.44.1.49 VO 44 IS 1 A1 G M Guindi A1 R Bannister A1 W P Gibson A1 J K Payne YR 1981 UL http://jnnp.bmj.com/content/44/1/49.abstract AB 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.