Diagnostic significance of urethral sphincter electromyography and external anal sphincter electromyography in patients with multiple system atrophy
  
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DOI:10.3724/SP.J.1264.2012.00078
Key words:external anal sphinter  urethral sphincter  electromyography  multiple system atrophy
Author NameAffiliationE-mail
QIU Feng, QI Xiaokun Department of Neurology, Navy Clinical Hospital, Second Military Medical University, Beijing 100048, China bjqxk@sina.com 
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Abstract:
      The urethral sphincter electromyography (US-EMG) and external anal sphincter electromyography (EAS-EMG) has certain significance for the diagnosis of multiple system atrophy (MSA). In this paper, we summarized the anatomical and pathophysiological basis of these two methods, and their methodology, normal and abnormal performance, as well as their roles in the diagnosis of the nervous system diseases. Currently, the significance of these two methods in MSA diagnosis remains controversial; the sensitivity and specificity in the diagnosis of MSA, and the correlations between the mutual differences and clinical characteristics have not been reported. Anal and urethral sphincter EMG manifested as neurogenic changes in multiple system atrophy, so that the examinations can be used as a conventional electrophysiological testing means in diagnosis of suspected MSA; however, further researches are needed for the differential diagnosis and their correlations.
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