Group allocation and intervention
All patients received 0.08 μg/kg sufentnail for prior analgesia. Young patients were randomized to control group (Group C, normal saline), medium-dose (Group M, 0.06 mg/kg) and high-dose (Group H, 0.08 mg/kg) remimazolam for procedure sedation. In elderly patients, the dose of remimazolam was reduced to low-dose (Group L, 0.04 mg/kg) and medium-dose (Group M, 0.06 mg/kg).