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Viscous fluid retention: a new method for evaluating anorectal function.

M Sørensen1, T Tetzschner, O O Rasmussen

  • 1Department of Surgery D, Glostrup Hospital, University of Copenhagen, Denmark.

Diseases of the Colon and Rectum
|April 1, 1992
PubMed
Summary
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Patients with fecal incontinence struggle to retain viscous fluid, indicating a potential issue with rectal sensation and compliance. This study highlights differences in rectal function between fecal incontinence and constipation patients.

Area of Science:

  • Gastroenterology
  • Colorectal Surgery
  • Physiology

Background:

  • Fecal incontinence and constipation are common conditions affecting rectal function.
  • Understanding the mechanisms of rectal fluid retention is crucial for diagnosis and treatment.

Purpose of the Study:

  • To investigate the ability to retain viscous fluid in patients with fecal incontinence and constipation compared to healthy controls.
  • To assess rectal sensory perception and compliance in these groups.

Main Methods:

  • Viscous fluid retention test in the standing position.
  • Rectal distention with air to measure sensory thresholds (earliest defecation urge, constant defecation urge, maximum tolerable volume).
  • Measurement of rectal compliance and regression analysis to identify relationships between variables.

Related Experiment Videos

Main Results:

  • Patients with fecal incontinence retained significantly less viscous fluid and had lower sensory volumes and higher rectal compliance than controls.
  • Constipated patients showed higher volumes at initial defecation urges but no difference in fluid retention compared to controls.
  • Fluid retention correlated linearly with maximum tolerable volume and rectal compliance; older age was associated with reduced retention.

Conclusions:

  • Impaired viscous fluid retention in fecal incontinence is linked to altered rectal sensation and compliance.
  • These findings differentiate rectal function in fecal incontinence from constipation.
  • The study establishes a reproducible method for assessing rectal fluid retention.