Digestive Diseases and Sciences

, Volume 57, Issue 5, pp 1321–1329

The Prevalence of Overgrowth by Aerobic Bacteria in the Small Intestine by Small Bowel Culture: Relationship with Irritable Bowel Syndrome

Authors

  • Emmannouil Pyleris
    • Department of GastroenterologySismanogleion General Hospital
    • 4th Department of Internal MedicineUniversity of Athens, Medical School
    • 4th Department of Internal MedicineATTIKON University Hospital
  • Dimitrios Tzivras
    • 4th Department of Internal MedicineUniversity of Athens, Medical School
  • Vassilios Koussoulas
    • Department of GastroenterologySismanogleion General Hospital
  • Charalambos Barbatzas
    • Department of GastroenterologySismanogleion General Hospital
  • Mark Pimentel
    • GI Motility Program, Cedars-Sinai Medical Center
Original Article

DOI: 10.1007/s10620-012-2033-7

Cite this article as:
Pyleris, E., Giamarellos-Bourboulis, E.J., Tzivras, D. et al. Dig Dis Sci (2012) 57: 1321. doi:10.1007/s10620-012-2033-7

Abstract

Objectives

Many studies have linked irritable bowel syndrome (IBS) with small intestinal bacterial overgrowth (SIBO), although they have done so on a qualitative basis using breath tests even though quantitative cultures are the hallmark of diagnosis. The purpose of this study was to underscore the frequency of SIBO in a large number of Greeks necessitating upper gastrointestinal (GI) tract endoscopy by using quantitative microbiological assessment of the duodenal aspirate.

Methods

Consecutive subjects presenting for upper GI endoscopy were eligible to participate. Quantitative culture of aspirates sampled from the third part of the duodenum during upper GI tract endoscopy was conducted under aerobic conditions. IBS was defined by Rome II criteria.

Results

Among 320 subjects enrolled, SIBO was diagnosed in 62 (19.4%); 42 of 62 had IBS (67.7%). SIBO was found in 37.5% of IBS sufferers. SIBO was found in 60% of IBS patients with predominant diarrhea compared with 27.3% without diarrhea (P = 0.004). Escherichia coli, Enterococcus spp and Klebsiella pneumoniae were the most common isolates within patients with SIBO. A step-wise logistic regression analysis revealed that IBS, history of type 2 diabetes mellitus and intake of proton pump inhibitors were independently and positively linked with SIBO; gastritis was protective against SIBO.

Conclusions

Using culture of the small bowel, SIBO by aerobe bacteria is independently linked with IBS. These results reinforce results of clinical trials evidencing a therapeutic role of non-absorbable antibiotics for the management of IBS symptoms.

Keywords

Irritable bowel syndromeIntestinal bacterial overgrowthDiabetes mellitusProton pump inhibitors

Copyright information

© Springer Science+Business Media, LLC 2012