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Related Experiment Videos

Anal sphincter response to distension.

M Bouchoucha1, A Faye, M Arsac

  • 1Laboratoire de Physiologie Digestive, Hôpital Broussais, 96 rue Didot, 75014 Paris, France. michel.bouchoucha@brs.ap-hop-paris.fr

International Journal of Colorectal Disease
|May 18, 2001
PubMed
Summary

Resting anal pressure is inadequate for assessing sphincter competence. A novel distension compliance method reveals the anal sphincter functions as a low-pass filter, not just a pressure barrier, offering new functional insights.

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Area of Science:

  • Gastroenterology
  • Physiology
  • Biomechanics

Background:

  • Resting anal pressure measurements lack efficacy in evaluating anal sphincter competence.
  • A need exists for a more accurate method to assess anal sphincter function.

Purpose of the Study:

  • To validate a compliance-based method for evaluating anal sphincter competence.
  • To investigate the anal canal's response to controlled distension.

Main Methods:

  • Twenty healthy subjects underwent anal sphincter distension using a balloon probe at two inflation rates: 12 ml/min and 80 ml/min.
  • Deflation protocols varied based on inflation rate, with a 2-minute hold at 12 ml deformation volume for the 80 ml/min group.
  • Biomechanical relaxation curves were recorded during distension.

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Main Results:

  • At 12 ml/min distension, subjects exhibited an initial resistance phase followed by anal sphincter relaxation.
  • No opening was observed in any subject at the 80 ml/min distension rate.
  • Distinct biomechanical relaxation curves were documented during the deformation process.

Conclusions:

  • The anal sphincter functions as a low-pass filter, indicating a dynamic response beyond a simple pressure barrier.
  • Anal sphincter distension compliance is a straightforward test providing valuable functional data.
  • This method offers a novel approach to understanding anal sphincteric zone behavior.