What is the role of electromyography (EMG) in the workup of constipation?

Updated: Mar 30, 2020
  • Author: Marc D Basson, MD, PhD, MBA, FACS; Chief Editor: BS Anand, MD  more...
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EMG documents paradoxical external sphincter or puborectalis spasm during defecation, consistent with the diagnosis of anismus. It is useful during subsequent biofeedback training because the patient is taught to relax these muscles.

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