Introduction
Peripheral nerve block, nerve block, pain
Peripheral nerve block presents significant clinical benefits in perioperative pain management [It is still controversial whether sedation and analgesia should be proposed routinely for nerve block [Remimazolam, an ultrashort-acting benzodiazepine, presents advantage in fast onset, relatively short recovery time with a context-sensitive half time only 6.8 min [Present study was designed to investigate the sedation efficacy of different doses of remimazolam with sufentanil in young and elderly patients who received nerve block, respectively.