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The Relationship between Small-Intestinal Bacterial Overgrowth and Intestinal Permeability in Patients with Irritable Bowel Syndrome.

Gut Liver. 2009 Sep;3(3):174-9

Authors: Park JH, Park DI, Kim HJ, Cho YK, Sohn CI, Jeon WK, Kim BI, Won KH, Park SM

BACKGROUND/AIMS: Small-intestinal bacterial overgrowth (SIBO) is a frequent finding in patients with irritable bowel syndrome (IBS). Many patients with IBS also have abnormal intestinal permeability, which is probably due to low-grade inflammation in the intestinal mucosa. Our aim was to verify the relationship between SIBO and small-intestinal permeability in IBS patients. METHODS: A cohort of 38 IBS patients (20 women and 18 men; age range 16-70 years; mean age 40.2 years) with symptoms that fulfilled Rome-II criteria, and 12 healthy controls (5 women and 7 men; age range 25-52 years; mean age: 37.8 years) were recruited. All subjects underwent lactulose breath tests (LBTs) and intestinal permeability tests using the polyethylene glycol (PEG) 3350/400 retrieval ratio. RESULTS: A positive LBT was found in 18.4% (7/38) of patients with IBS and 8.3% (1/12) of control subjects. Intestinal permeability was significantly increased in patients with IBS compared with the normal controls (0.82+/-0.09 vs 0.41+/-0.05 [mean+/-SD], respectively; p<0.05). However, the intestinal permeability did not differ significantly between IBS patients with a positive LBT and those with a negative LBT (0.90+/-0.13 and 0.80+/-0.11, respectively; p>0.05). CONCLUSIONS: Intestinal permeability was increased in patients with IBS, but this finding did not correlated with the occurrence of SIBO.

PMID: 20431742 [PubMed - in process]

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