RESUMEN

Objective:To evaluate the dose-response relationship of remimazolam for loss of consciousness during anesthesia induction in the patients undergoing coronary artery bypass grafting (CABG).Methods:American Society of Anesthesiologists Physical Status classification Ⅲ or Ⅳpatients, aged 55-64 yr, with body mass index of 21-26 kg/m 2, scheduled for elective CABG under general anesthesia, were included in this study.The trial was conducted using the modified Dixon′s up-and-down method. The initial dose of remimazolam was 0.225 mg/kg, each time the concentration increased/decreased by 0.025 mg/kg in the next patient depending on whether or not the patients lost consciousness. Criteria for loss of consciousness was considered as the modified vigilance sedation score≤1 within 3 min after remimazolam administration. The 50% effective dose (ED 50), 95% effective dose (ED 95) and their 95% confidence interval ( CI) was analyzed by probit probability analysis method. Results:The ED 50 of remimazolam for loss of consciousness during anesthesia induction was 0.175 mg/kg, 95% CI was 0.163-0.185 mg/kg, ED 95 was 0.211 mg/kg, and 95% CI was 0.197-0.255 mg/kg. Conclusions:The ED 50 and ED 95 of remimazolam were 0.175 and 0.211 mg/kg respectively when used for loss of consciousness during anesthesia induction in the patients undergoing CABG.