Endoscopic Retrograde Choledochopancreatography(ERCP) has the advantages of less injury and faster recovery for common bile duct stone patients. However, according to our retrospective study, ERCP will has a mostly 10% possibility to get an acute purulent cholecystitis which often requires emergency intervention, when patients combined with chronic gallbladder diseases, such as chronic cholecystitis, asymptomatic gallstones, and gallbladder wall thickness, the incidence of PEC will increase accordingly. The aim of this study is to observe if chronic gallbladder disease will increase the occurence of PEC and develop a high-risk PEC model.
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