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The common bile duct (CBD) pressure was determined in 57 patients before endoscopic retrograde cholangiography (ERC) and related to the diameter of the CBD and the common hepatic duct (CHD). We found that despite a weak overall positive correlation in the individual patient, CBD or CHD diameters do not correlate with CBD pressure. In patients without extrahepatic cholestasis and normal CBD pressure, both CBD and CHD diameters were measured in a wide range between 5 and 32 mm. Extrahepatic cholestasis due to distal CBD obstruction is reflected by a high CBD pressure, but cannot be identified reliably by measuring the CBD diameter which is found within the range of patients not obstructed. In cholecystectomized patients, CBD and CHD are significantly (p less than 0.005) wider than in non-cholecystectomized patients (8.8 +/- 1.0 vs. 13.3 +/- 1.2 and 9.2 +/- 0.9 vs. 14.2 +/- 1.2 mm, respectively). The CBD pressure, however, is nearly identical in both groups. It is concluded that the assessment of CBD and CHD diameter is not a reliable parameter for the diagnosis of extrahepatic cholestasis which--in certain cases--could be proved by endoscopic retrograde manometry.
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