Based on previous results, the investigators considered that sedation quality, complications,
and procedure outcomes may not be different, however, propofol alone titration may have a
fast recovery time than BPS and cost-effectiveness than balanced propofol sedation (BPS). In
present study, the investigators therefore evaluate the time and sedation quality of patient
recovery, cost-effectiveness, complication, and procedure outcomes between propofol alone and
BPS in therapeutic endoscopic retrograde cholangiopancreatography (ERCP).