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Anorectal angle enhances faecal continence

C A Hajivassiliou1, K B Carter, I G Finlay

  • 1Department of Coloproctology, Royal Infirmary, Glasgow, UK.

The British Journal of Surgery
|January 1, 1996
PubMed
Summary
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Anorectal angulation significantly enhances the retention of semisolid stool by increasing holdback pressure. Liquid stool retention, however, relies solely on occlusion pressure, unaffected by angulation.

Area of Science:

  • Gastroenterology
  • Physiology
  • Anatomy

Background:

  • Faecal continence is crucial for quality of life.
  • Sphincter pressure and anorectal angulation are key anatomical factors.
  • Understanding their relative contributions is important for clinical applications.

Purpose of the Study:

  • To assess the independent and combined roles of sphincter pressure and anorectal angulation in maintaining faecal continence.
  • To differentiate the mechanisms of liquid versus semisolid material retention.

Main Methods:

  • An in vitro model using porcine intestine and an inflatable cuff was employed.
  • Water and semisolid materials were infused at varying degrees of anorectal angulation (180° and 90°).
  • Holdback pressure and resistance to flow were measured.

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Main Results:

  • Liquid retention pressure was independent of anorectal angulation.
  • Semisolid material retention pressure increased by over 100% at 90° angulation compared to 180°.
  • Flow resistance for semisolid material in tubes was flow-rate dependent, influenced by bends.

Conclusions:

  • Rectal liquid retention is primarily governed by occlusion pressure.
  • Anorectal angulation plays a significant role in enhancing the retention of semisolid faecal material.
  • These findings elucidate distinct mechanisms for liquid and semisolid stool continence.