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The effect of cathartic agents on transmucosal electrical potential difference in the human rectum

Einfluß laxierender Substanzen auf die transmucöse elektrische Potentialdifferenz im menschlichen Rektum

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Zusammenfassung

Eine elektrische transmurale Potentialdifferenz (PD) von ca. 40 mV wird im Colon durch einen aktiven Ionentransport erzeugt. Laxierend wirkende Substanzen hemmen die Elektrolyt- und Wassernettoresorption oder verursachen eine Nettosekretion, was auch einen Einfluß auf die PD erwarten läßt.

Bei 83 Normalpersonen wurde eine isotone Elektrolytlösung (Kontrollgruppe) und folgende laxierende Substanzen getestet: Laxantien (Bisacodyl, Rhein), Gallensäuren (Chol- und Desoxycholsäuren), Fettsäuren (Öl- und Rizinolsäure) und Herzglykoside (Meproscillarin, Digitoxin, Digoxin). Bisacodyl, Desoxycholsäure in hoher Konzentration, Meproscillarin und Digitoxin verringerten die PD signifikant, die anderen Substanzen hatten keinen wesentlichen Effekt. Laxierend wirkende Substanzen wirken auf verschiedene Transportmechanismen. Dies zusammen mit den unterschiedlichen Resorptionscharakeristika im proximalen und distalen Colon könnten die Unterschiede der Wirkung auf die PD erklären. Die rektale PD-Messung bietet eine einfache und brauchbare Methode, die Wirkungen laxierender Substanzen zu dokumentieren, welche sonst schwer zu erfassen sind und eignet sich für eine klinische Anwendung.

Summary

Active ion transport in the colon is generating a transmucosal electrical potential difference (PD) of about 40 mV. Cathartic agents inhibit electrolyte and water net-absorption or cause net-secretion which should be reflected in a change of PD.

In 83 normal subjects the effect of an isotonic eletrolyte solution (control) and different cathartic agents on rectal PD was tested: Laxatives (bisacodyl, rhein), bile acids (cholic and deoxycholic acid), fatty acids (oleic and ricinoleic acid) and cardiac glycosides (meproscillarin, digitoxin, digoxin). Bisacodyl, deoxycholic acid in high concentration, meproscillarin and digitoxin significantly decreased PD, while the other substances did not.

Cathartics act on different transport mechanisms which together with different absorption characteristics of the proximal and distal colon may explain the difference in effecting the PD. Rectal PD measurement provides an easy and convenient tool to document effects of cathartic agents on electrolyte transport, otherwise difficult to obtain, and is applicable for clinical use.

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To Prof. Dr. H.P. Wolff on the occasion of his 65th birthday

This work was supported by a grant of the Deutsche Forschungsgemeinschaft Ew4/11

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Ewe, K., Wanitschke, R. The effect of cathartic agents on transmucosal electrical potential difference in the human rectum. Klin Wochenschr 58, 299–306 (1980). https://doi.org/10.1007/BF01476572

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