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Carbohydrate malabsorption: quantification by methane and hydrogen breath tests

J J Rumessen1, I Nordgaard-Andersen, E Gudmand-Høyer

  • 1Dept. of Internal Medicine and Gastroenterology F, Gentofte Hospital, University of Copenhagen, Denmark.

Scandinavian Journal of Gastroenterology
|September 1, 1994
PubMed
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Adding methane to hydrogen measurements improves carbohydrate malabsorption estimates in methane producers. Knowing methane production status is key for accurate breath test interpretation. Other factors may cause digestive symptoms.

Area of Science:

  • Gastroenterology
  • Microbiology
  • Pulmonary Medicine

Background:

  • Previous studies suggest parallel hydrogen and methane measurements enhance carbohydrate malabsorption estimates.
  • Systematic, controlled studies on simultaneous breath tests are lacking.

Purpose of the Study:

  • To evaluate the role of simultaneous hydrogen and methane measurements in end-expiratory breath tests for assessing carbohydrate malabsorption.
  • To determine if combining methane and hydrogen excretion data improves precision.

Main Methods:

  • End-expiratory breath tests were performed on healthy adults (methane producers and non-producers).
  • Breath gas concentrations and gastrointestinal symptoms were recorded for 12 hours after lactulose ingestion (10, 20, 30 g).

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Main Results:

  • Methane excretion patterns in producers were variable and not reliably reproducible.
  • Adding methane to hydrogen excretion curves (AUCs) improved carbohydrate malabsorption estimates in methane producers at a 20g lactulose dose.
  • Estimates were not more precise in methane producers compared to non-producers.

Conclusions:

  • Simple addition of methane and hydrogen excretion improves semiquantitative measurement precision in methane producers.
  • Methane production status is crucial for interpreting breath tests semiquantitatively.
  • Weak correlation between gas excretion and symptoms suggests other factors contribute to abdominal complaints.