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quantitative emg of the external anal sphincter (eas) is highly useful in the diagnosis of patients with suspected neuropathic sacral lesions. New developments in electromyography and clinical neurophysiology, karger, basel. electromyographic (emg) examinations of the anal and urethral sphincters have been performed since 1955 (petersen & franksson, 1955). Gradually, it has been introduced for paraplegic care by timmermans et al. The electromyogram (emg) is a diagnostic tool that measures and records the electrical activity produced by skeletal muscles. The anal sphincter and urethral external sphincter are skeletal muscle in nature. There are two kinds of emg in widespread use in the field of urodynamic investigation surface (patch) and intramuscular (fine-wire) emg. external anal-sphincter electromyography (eas-emg) and urethral-sphincter electromyography (us-emg) may have diagnostic value for msa-c 13. New developments in electromyography and clinical neurophysiology, karger, basel. External anal sphincter (eas)-electromyography (emg) is an established method to detect neurogenic change in motor unit potentials (mup), which mostly reflects denervation and reinnervation of the sphincter muscle. The significance of the eas-emg in msa has been well known , ,. In the group with possible msa, only 5 patients had an abnormal emg while in the group with probable ipd, only 1 patient had an abnormal emg.