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

Updated: Jul 05, 2019
  • Author: Marc D Basson, MD, PhD, MBA, FACS; Chief Editor: BS Anand, MD  more...
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Answer

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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