Which parameters are assessed in anorectal manometry 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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Anorectal manometry documents several parameters, including the following:

  • External anal sphincter and puborectalis function

  • Reflex relaxation of the internal sphincter when the rectum is distended

  • Coordination of these muscles during the bear-down phase of defecation

  • Anorectal pressures during these events

  • The threshold at which rectal distention is perceived

Interpreting the results of anorectal manometry is complex and varies with the center performing the test. Consult a specialist familiar with the local testing facilities.

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