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Fluid loading of the human colon: effects on segmental transit and stool composition
1Allgemeines Krankenhaus der Stadt Wien, Austria.
Gastroenterology
|October 1, 1993
Summary
Colonic transit studies show fluids move faster than solids in the ascending colon, while the rectosigmoid extensively stores contents. Stool consistency reflects overall colonic transit time in healthy adults.
Area of Science:
- Gastroenterology
- Physiology
Background:
- Segmental colonic storage is crucial for understanding diarrheal conditions.
- Quantifying colonic transit provides insights into digestive processes.
Purpose of the Study:
- To quantify colonic transit times and storage patterns in healthy volunteers.
- To investigate the influence of infusion rate on colonic transit.
Main Methods:
- Radiolabeled liquids and solids were infused into the cecum of 13 healthy volunteers.
- Gamma camera imaging tracked isotope distribution in the ascending (AC), transverse (TC), descending (DC), and rectosigmoid (RS) colon over 48 hours.
- Bowel movement consistency and stool output were analyzed.
Main Results:
- Infusion rate affected transit time in the AC and TC, but not overall excretion.
- Solids were initially delayed in the AC, with liquids and solids stored similarly in the TC.
- The RS demonstrated significant storage, while the DC primarily served as a conduit.
- Fecal consistency and water content strongly correlated with colonic transit times.
Conclusions:
- The colon exhibits distinct regional storage capacities, with the RS being a major storage site.
- Fluid transit precedes solid transit in the AC, with equal storage in the TC.
- Stool consistency serves as a reliable indicator of total colonic transit.
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