Sixty two patients with a clinical suspicion of biliary dyskinesia were investigated with endoscopic manometry of the sphincter of Oddi before and after intravenous injection of cholecystokinin or ceruletide. In 52 patients injection was followed by decreased pressure in the sphincter of Oddi; 43 of these had normal prestimulatory values (group I), while the values were raised in the other nine patients (group II). A paradoxical response to intravenous injection was observed in 10 women (group III): increased baseline sphincteric pressure occurred in eight and increase in the amplitude of phasic contractions in four patients. The prestimulatory sphincteric pressure was raised in five and normal in the remaining patients. Eight patients were treated with papillotomy (seven) or balloon dilatation of the sphincter (one). They experienced relief of pain during a follow up period of 11-16 months. Intravenous injection of cholecystokinin or ceruletide may disclose a special type of biliary dyskinesia even in patients with normal prestimulatory manometric findings. Hormone injection increases the diagnostic yield of endoscopic manometry in patients suspected of biliary dyskinesia.
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