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Journal Article
Review
Bile acid diarrhea.
Digestive Diseases 1998 March
Bile acids normally undergo enterohepatic circulation. When this circulation is interrupted, bile acids enter the colon in increased concentrations. Here, they produce Cl- secretion by a calcium- and cyclic AMP-dependent mechanism, resulting in diarrhea. Cholestasis may lead to serum bile acid concentrations high enough to produce colonic secretion by serosal surface effects. When resection or disease interferes with ileal function, the resulting diarrhea can be clearly attributed to bile acid malabsorption. In other states, such as postcholecystectomy diarrhea and idiopathic bile acid diarrhea, the role of bile acids is less well defined. 23-75Selena-25-homotaurocholic acid provides a way of tracing the metabolism of bile acids and their enterohepatic circulation in vivo. Metabolized similarly to natural bile acids, its circulation is easily traced by scintigraphy. Barium x-rays, serum concentrations of bile acids or bile acid intermediates, and tests of vitamin B12 absorption provide indirect measures of ileal function. Careful history and examination combined with one of many the available tests of ileal function allow a diagnosis. A therapeutic trial with a bile acid binding resin confirms the impression and treats the diarrhea.
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