What are best practices for administering anal sphincter electromyography (EMG)?

Updated: Aug 06, 2019
  • Author: Jasvinder Chawla, MD, MBA; Chief Editor: David C Spencer, MD  more...
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Needle electrode is considered the most accurate method, since the electrodes are inserted directly into the muscle, using needles to guide placement.

The superficial EAS muscle has the highest diagnostic yield. The superficial EAS can be localized on needle EMG by its higher number of low threshold motor units that fire continuously during relaxation. [2] It can be reached with a sharp angle of insertion relative to the mucosal surface. [2]

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