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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 electromyography (emg) is recorded with a small sponge electrode in the anal canal. The external anal sphincter (eas) anatomy is complex, and no exact technique of needle electrode insertion into it for electromyography (emg) has been described. To define optimal positions for needle electrode insertions, eas muscle topography was studied by concentric needle emg. Anal sphincter emg in the diagnosis of parkinsonian syndromes. The different parts of the external anal sphincter (eas) are usually regarded as one muscle with common emg characteristics. This assumption was addressed by comparing the number of continuously firing motor units (mus) during relaxation, as well as the parameters of motor unit potentials (mups) and interference pattern (ip) in the subcutaneous and the deeper parts of eas. Clinical distinction of multiple system atrophy (msa) from parkinsons disease (pd) is often difficult. Several recent reports indicate that objective classification may be accomplished using electro. Objectiveto evaluate data of quantitative anal sphincter emg in normal controls and to compare them with patients with multiple system atrophy (msa). Methodsquantitative anal sphincter emg were performed on 100 normal controls and 11 patients with msa to characterise emg data in these two groups. Resultsin the normal controls, there was a trend for increased motor unit potential (mup.). Quantitative external anal sphincter emg using multiple motor unit action potential analysis provides evidence of subtle nerve injury in asymptomatic women at 12 weeks postpartum after a single vaginal delivery that is not detectable by less sensitive, but more commonly used, measures such as the pudendal nerve terminal motor latency examination.