Intestinal microflora settlement was evaluated in this retrospective study of 49 patients with jejunoileal bypass who required reoperation. Colonic microflora was observed in the samples of the contents of the functioning jejunum and ileum but not in 55% of the samples from the middle of the excluded loop. Colonization of the excluded loop was not detected in patients without clinical signs of bacterial overgrowth but was significantly frequent (p < 0.01) in those with clinical signs (bloating, migratory arthralgias, rashes, skin lesions). However, positive excluded loop cultures were not always associated with clinical manifestations. No significant correlation was observed between bacteriology of the contents of the excluded loop and bypass results. The success of an intestinal bypass may depend not only on anatomic and functional adaptation to the new, surgically created conditions, but also to the attainment of microbiological equilibrium in the intestinal ecosystem.
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