IRCT201201018575N1 IRCT 2013-06-24 Vice chancellor for research, Iran University of Medical Sciences Effect of stent in pancreatic duct for preventing pancreatitis complications Effect of pancreatic duct stenting before common bile duct (CBD) cannulation for preventing post endoscopic retrograde cholangiopancreatography (ERCP) pancreatitis in patients attending in Firoozgar hospital 2012-02-20 anticipated 96 Complete https://irct.ir/trial/9067 interventional Randomization: Not randomized, Blinding: Single blinded, Placebo: Not used, Assignment: Parallel, Purpose: Prevention, Other design features: We will study two groups that the ERCP will be done for both of them but only for one group (as Intervention group) put stent. Both of putting and no putting of stent have been approved theoretically and practically. The main goal of this study is the comparison incidence of post-ERCP pancreatitis among intervention and control groups. N/A Common Bile Duct (CBD) stone. Intervention 1: In the intervention group, according to the accidental cannulation of pancreatic duct, a plastic stent 5cm and 5f (French) is placed in the pancreatic duct, and then ERCP will be done. In the control group, standard ERCP will be done (without putting stent). Stent will be done. Intervention 2: In the control group, standard ERCP without stenting is done, and the results would be compared with the case group.