Patients received flumazenil (1.0 mg bolus intravenous) or placebo (normal saline) respectively in trt group or ctrl group during the intensive observation period (IOP, 2.5 hours) and were followed up until discharge or death in ward.

• 存重点观察阶段(IOP；2.；5小时)；治疗组和对照组患者分别接受氟马西尼(1mg；静脉注射)和等量的生理盐水；并全部随访至出院或在院内死亡。