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Physiological variation in rectal compliance.

M Sørensen1, O O Rasmussen, T Tetzschner

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

The British Journal of Surgery
|October 1, 1992
PubMed
Summary
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Maximum tolerable volume (MTV) is a reliable measure for evaluating fecal incontinence and constipation. This study found MTV to be reproducible in clinical settings, unlike other rectal pressure measurements.

Area of Science:

  • Gastroenterology
  • Physiology

Background:

  • Understanding rectal function is crucial for diagnosing and managing bowel disorders.
  • Rectal compliance and pressure-volume relationships are key indicators of rectal function.

Purpose of the Study:

  • To assess the reproducibility of rectal pressure and volume measurements.
  • To determine the suitability of maximum tolerable volume (MTV) as a clinical parameter for evaluating fecal incontinence and constipation.

Main Methods:

  • 48 subjects (24 men, 24 women) underwent rectal balloon inflation to measure volume (V) and pressure (P) at three points: earliest defecation urge, constant urge, and MTV.
  • Rectal compliance (ΔV/ΔP) was calculated.
  • Day-to-day measurement variation was assessed in 10 subjects.

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Main Results:

  • Rectal pressures were higher in men than women across all measurement points.
  • Women over 60 had higher rectal compliance than men in the same age group; no difference was found below 60.
  • Maximum tolerable volume (MTV) demonstrated good day-to-day reproducibility (95% CI: 57-183%), while rectal compliance reproducibility decreased with higher values.

Conclusions:

  • Maximum tolerable volume (MTV) is a reproducible and clinically suitable parameter for assessing patients with fecal incontinence or constipation.
  • Other rectal pressure and compliance measurements showed lower reproducibility, limiting their clinical utility.