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Anokhi S Kholwadwala1, Eamonn M M Quigley2

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Overdiagnosis of small intestinal bacterial overgrowth (SIBO) is common due to reliance on breath tests. A cautious approach to diagnosis and antibiotic use is recommended, awaiting further research.

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Area of Science:

  • Gastroenterology
  • Microbiology
  • Digestive Health

Background:

  • Small intestinal bacterial overgrowth (SIBO) was historically linked to maldigestion/malabsorption, diagnosed via upper small intestine aspirate cultures.
  • The advent of hydrogen breath tests dramatically increased SIBO diagnoses, broadening its scope to non-specific gastrointestinal and systemic complaints.
  • Current diagnostic methods, especially lactulose breath tests, are questioned for potentially leading to SIBO overdiagnosis.

Purpose of the Study:

  • To critically review the diagnosis of small intestinal bacterial overgrowth (SIBO).
  • To address contentious issues including diagnostic thresholds, antibiotic response, and the role of other gases like methane.
  • To explore intestinal methanogen overgrowth (IMO) and the role of methanogens and methane in gastrointestinal homeostasis.

Main Methods:

  • Literature review focusing on diagnostic criteria and therapeutic responses for SIBO.
  • Critical analysis of breath test methodologies, particularly lactulose-based hydrogen breath tests.
  • Exploration of the role of methane and methanogens in the context of gastrointestinal health.

Main Results:

  • Evidence suggests that breath tests, especially with lactulose, may lead to overdiagnosis of SIBO.
  • Key diagnostic aspects such as thresholds and response to antibiotics remain unresolved.
  • The significance of methane, hydrogen sulfide, and other gases in SIBO diagnosis requires further investigation.

Conclusions:

  • A critical and cautious approach to diagnosing SIBO and IMO is advocated.
  • Judicious use of antibiotics for SIBO and IMO is recommended.
  • Future research utilizing molecular microbiology is needed to fully understand the small intestinal microbiome, metabolome, and methane biology.