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Does glucagon enhance opacification of the bile ducts during intravenous cholangiography? An experimental study in dogs.

To determine the rational for the ability of glucagon to enhance opacification of the bile ducts during intravenous cholangiography, which has been claimed in recent clinical reports, experiments were performed in dogs which had had Thomas cannulas inserted. A constant step-wise infusion of iodipamide was administered with or without a bolus injection and constant infusion of glucagon. At every infusion rate of iodipamide the biliary concentration of the contrast agent was less when glucagon was administered. Glucagon caused a choleresis, but had no effect on the rate of excretion of iodipamide. It is concluded that the theory that glucagon is of value to improve opacification of the bile ducts during intravenous cholangiography is unlikely to be confirmed by further clinical trials.