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Related Experiment Videos

Is the irritable bowel really irritable?

G Coremans1, J Tack, G Vantrappen

  • 1Gastroenterology Research Center, University of Louvain, Belgium.

The Italian Journal of Gastroenterology
|November 1, 1991
PubMed
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Patients with irritable bowel syndrome (IBS) exhibit heightened sensitivity to colonic stimuli like distension and chemical irritants. These findings suggest a non-specific colonic irritability may characterize IBS.

Area of Science:

  • Gastroenterology
  • Neurogastroenterology
  • Visceral Pain Research

Background:

  • Irritable bowel syndrome (IBS) is a common functional gastrointestinal disorder.
  • The underlying mechanisms of visceral hypersensitivity in IBS are not fully understood.

Purpose of the Study:

  • To investigate the sensitivity of patients with IBS to colonic distension and chemical stimuli.
  • To compare the pain thresholds between IBS patients and healthy controls.

Main Methods:

  • Recruitment of 9 IBS patients and 5 healthy volunteers.
  • Infusion of the colon with saline, bile acids, and fatty acids.
  • Assessment of colonic pain thresholds using balloon distension.

Main Results:

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  • IBS patients demonstrated a significantly lower pain threshold compared to controls (p < 0.001).
  • Bile acids induced habitual pain in 71% of IBS patients, and fatty acids in 87.5%, with no effect in controls.
  • Colonic distension and perfusions were poorly tolerated by IBS patients.

Conclusions:

  • IBS patients exhibit enhanced sensitivity to colonic distension and perfusions.
  • These findings suggest a non-specific colonic irritability as a potential characteristic of IBS.
  • Bile acids and fatty acids may act as triggers for pain in IBS patients.