Permanently increased mucosal permeability in patients with backwash ileitis after ileoanal pouch for ulcerative colitis

Authors: Kroesen, Anton¹; Dullat, Sonja¹; Schulzke, Joerg²; Fromm, Michael³; Buhr, Heinz¹

Source: Scandinavian Journal of Gastroenterology, Volume 43, Number 6, 2008 , pp. 704-711(8)

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Abstract:

Objective. Backwash ileitis (BI) has not been identified as a risk factor for pouchitis. The aim of this study was to investigate the barrier function of the ileoanal pouch depending on the presence of BI. The incidence of pouchitis in a population of ulcerative colitis patients with BI is also reported. Material and methods. Biopsies were taken from 80 patients with ulcerative colitis: a) terminal ileum prior to pouch creation (pre-IAP); b) 16 months after ileostomy closure (intact pouch); and c) during pouchitis. Patients were stratified into the BI group and the non-BI (ØBI) group. Barrier function was determined in Ussing-chambers as epithelial resistance by impedance analysis and as mannitol permeability from 3H-mannitol fluxes. Na+-glucose co-transport was measured as a change in short-circuit current (ISC) after addition of glucose. Relative risk of developing pouchitis was calculated by corrected χ2 test. Results. In 13/21 (BI/ØBI) pre-IAP patients, 23/37 (BI/ØBI) with an intact pouch, and 35/7 (BI/ØBI) with pouchitis, epithelial resistance in BI/ØBI was 13.5±1.6/14.3±0.9 Ω·cm2 for pre-IAP, 12.7±1.3/16.8±1.2 Ω·cm2 (p<0.05 BI versus ØBI) for the intact pouch, and 10.1±1.1/9.9±1.8 Ω·cm2 for pouchitis (p<0.05 BI versus ØBI with an intact pouch). No differences were found for electrogenic chloride secretion and active Na+-glucose co-transport between BI/ØBI in the three groups. In patients with BI, pouchitis was more common (35 versus 7 patients, odds ratio 33.0 (95% CI 8.3-143.9; p<0.0001)). Conclusions. Ulcerative colitis patients with BI show impaired barrier function in the further course of the ileoanal pouch. Thus, BI has a long-term impact on epithelial barrier function.

Keywords: Active transport; biopsy; mannitol permeability; pouchitis; transepithelial resistance; ulcerative colitis

Document Type: Research article

DOI: 10.1080/00365520701873206

Affiliations: 1: Departments of Surgery, Charite-Universitatsmedizin Berlin, Campus Benjamin Franklin, Berlin, Germany 2: Gastroenterology & Infectiology, Charite-Universitatsmedizin Berlin, Campus Benjamin Franklin, Berlin, Germany 3: Clinical Physiology, Charite-Universitatsmedizin Berlin, Campus Benjamin Franklin, Berlin, Germany