Reproducible Lactulose Hydrogen Breath Test As a Measure of Mouth-to-cecum Transit Time

Overview

Journal Dig Dis Sci

Specialty Gastroenterology

Date 1989 Jun 1

PMID 2656138

Citations 13

Authors

S D Ladas

C Latoufis

H Giannopoulou

J Hatziioannou

S A Raptis

Affiliations

Soon will be listed here.

Abstract

Breath hydrogen monitoring after oral lactulose syrup is a conventional measure of mouth-to-cecum transit time (MCTT), but its reproducibility has been questioned. We compared the reproducibility of five measurements of MCTT after a conventional breakfast (380 kcal) taken with tea containing 20 g lactulose to five measurements of MCTT after 20 g lactulose in water in eight normal volunteers. Individual mean breakfast transit time was not significantly different from lactulose transit time in each of the seven subjects, but one had a breakfast transit time of 151 +/- 15 min and a lactulose transit time of 86 +/- 22 minutes (X +/- SD, P less than 0.001). The coefficient of variation of breakfast transit time (11.6 +/- 5.3%, range: 6.9-24.2%) was less than that of lactulose transit time (30.7 +/- 7.8%, range: 22.1-50.0%, P less than 0.001). In a second set of experiments, the liquid phase marker (99mTechnetium-diethylene triamine pentaacetic acid) emptied from the stomach more rapidly after the lactulose solution (T1/2 16.3 +/- 5.4) than after the breakfast (33.9 +/- 10.9 min, P less than 0.01) and MCTT was shorter after lactulose (77 +/- 32 vs 104 +/- 40 min, respectively, P less than 0.05). There was no correlation between MCTT of lactulose and breakfast and between half-time gastric emptying and MCTT of either lactulose or breakfast. We conclude that the ingestion of inert lactulose induces an abnormally rapid MCTT and that breakfast MCTT is a much more reproducible investigation and should be employed in studies requiring serial measurements.

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