We analysed 99 consecutive patients(45 males and 44 females) undergoing ERCP from March to September, 1994. The level of serumamylase was measured and clinical assessment of pancreatitis was performed before, 24 hour, 48 hour, and 72 hour after ERCP. We defined clidical pancreatitis as combination of elevated amylase level over 2 days with abdomial pain and tenderness.(continue..)