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The role of cholecystokinin in radiographic opacification of the gallbladder.

Studies of the effect of cholecystokinin (CCK) on hepatic elimination of intravenously administered iopanoate and on gallbladder opacification were performed using nonoperated dogs with intact enterohepatic circulation and normal endogenous bile salt pool. Intravenous administration of CCK (3 units/kg) resulted in a 32% increase in apparent transport maximum (maximum rate of elimination) of iopanoate and earlier and enhanced gallbladder opacification. This increase in apparent transport maximum was abolished by cholecystectomy, indicating that the increase was a result of the release of bile salts from the gallbladder rather than a direct effect of the hormone on the hepatic elimination of iopanoate. The early gallbladder opacification and increased density of contrast material in the gallbladder were related to CCK-induced emptying of the gallbladder and subsequent filling with opacified bile.