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Related Experiment Videos

Small intestinal bacterial overgrowth--an incidental finding?

M MacMahon1, M Lynch, E Mullins

  • 1Mercer's Institute for Research on Ageing, St. James's Hospital, Ireland.

Journal of the American Geriatrics Society
|February 1, 1994
PubMed
Summary

Small intestinal bacterial overgrowth (SIBO) is common in the elderly, with advancing age linked to increased anaerobic bacteria. However, SIBO appears benign in this population and does not routinely require treatment.

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Area of Science:

  • Gastroenterology
  • Geriatrics
  • Microbiology

Background:

  • Small intestinal bacterial overgrowth (SIBO) is a condition characterized by an excessive amount of bacteria in the small intestine.
  • The prevalence and clinical significance of SIBO in the elderly population are not well-established.

Purpose of the Study:

  • To determine the prevalence of SIBO in elderly patients admitted to an acute medical ward.
  • To assess the clinical features associated with SIBO in this demographic.
  • To evaluate the necessity of SIBO treatment in the elderly.

Main Methods:

  • A prospective study involving 30 elderly patients (68-90 years) admitted to a Department of Medicine for the Elderly.
  • Patients were randomly selected, irrespective of nutritional status.

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  • Clinical symptoms, routine blood tests, and small bowel bacteriology were analyzed, with a focus on the effect of age.

    • Main Results:

    • SIBO was confirmed in 20 out of 30 patients, with strict anaerobes isolated in 15.
    • No significant differences in routine blood test values were found between SIBO-positive and SIBO-negative patients.
    • While SIBO was common, alternative causes were identified for associated symptoms like anemia, hypoalbuminemia, diarrhea, and weight loss. Advancing age correlated with increased anaerobic bacteria.

    Conclusions:

    • Age appears to be a predisposing factor for anaerobic bacterial overgrowth in the small intestine.
    • SIBO in the elderly is generally a benign condition.
    • Routine treatment for SIBO in the elderly is not indicated based on these findings.