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anal sphincter emg may also be useful in the evaluation of patients with multisystem atrophy (msa). 11, 12 patients with msa have degenerative changes in interomediolateral cell columns and onufs nucleus in the spinal cord, innervating both urethral and anal sphincters. Abnormal emg of the eas is strongly suggestive of an atypical parkinsonian syndrome such as msa. Anal sphincter emg in the diagnosis of parkinsonian syndromes. Anal sphincter emg in the diagnosis of parkinsonian syndromes. External sphincter electromyography definition external sphincter electromyography helps physicians determine how well the external urinary sphincter muscle is working by measuring the electrical activity in it during contraction and relaxation. Purpose the external sphincter muscle is the ring-like muscle that controls urine release from the bladder. anal sphincter electromyography may be clinically useful in the evaluation of patients with urinary, bowel, and sexual dysfunction. It should be considered for all patients with a history and clinical examination suggestive of a central or peripheral sacral neuropathic lesion. Anal sphincter electromyography (emg) and ano-rectal manometry are simple outpatient tests to assess whether the anal muscle (sphincter) and nerves are working correctly. The anal sphincter is the muscle valve at the opening of the rectum that controls bowel movements. Anal sphincter emg in patients with msa (both msa-p and msa-c) shows polyphasic, enlarged motor unit potentials (mups) as a result of reinnervation of this striated muscle (vodusek, 2001). Standardization of anal sphincter emg technique of needle examination article (pdf available) in muscle & nerve 22(3)400- with 712 reads how we measure reads. Anal sphincter electromyogram for dysfunction of lower urinary tract and pelvic floor 163 disorder is more than 30.