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Related Experiment Videos

The trigger for rectal filling sensation

P M Broens1, F M Penninckx, B Lestár

  • 1Department of Abdominal Surgery, University Clinics Gasthuisberg, Catholic University of Leuven, Belgium.

International Journal of Colorectal Disease
|April 1, 1994
PubMed
Summary

Rectal sensation is triggered by pressure, not volume or weight. Changes in rectal pressure, not volume, indicate disturbances in rectal sensation, aiding clinical evaluation.

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Area of Science:

  • Gastroenterology
  • Neuroscience
  • Physiology

Background:

  • Assessing rectal sensation is crucial for diagnosing defecation disorders.
  • Previous studies have not definitively identified whether rectal volume, weight, or pressure triggers sensation.

Purpose of the Study:

  • To determine the primary physical parameter (volume, weight, or pressure) responsible for triggering rectal sensation thresholds.
  • To establish a reliable method for evaluating rectal sensation in clinical settings.

Main Methods:

  • 12 adult subjects underwent rectal balloon distension with water, air, and mercury.
  • Measurements of volume, weight, and pressure were taken at four sensation thresholds: first, constant, urge, and maximum.
  • Pressure values were corrected for balloon elasticity; air volume was adjusted for rectal pressure and temperature.

Main Results:

  • A consistent relationship was observed between rectal sensation levels and distending pressure, irrespective of the medium used.
  • Rectal volume and weight did not show a constant correlation with specific sensation levels.
  • Rectal pressure, not volume, consistently reflected sensation levels during repeated measurements.

Conclusions:

  • Rectal pressure is the primary determinant of rectal sensation, not volume or weight.
  • Disturbances in rectal sensation are best identified by changes in pressure, making it a key diagnostic indicator.
  • Air-filled balloon distension in the lateral position is recommended for routine rectal sensation evaluation.

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