Objective: To estimate the safety and efficacy of remimazolam tosilate used for moderate-to-deep sedation in fiberoptic bronchoscopy with its 50% effective dosage (ED50) and 95% effective dosage (ED95) calculated. Methods: A total of 50 patients aged from 18 to 65 years and classified as Class Ⅰ or Ⅱ according to the American Society of Anesthesiologists (ASA) Classification who underwent fiberoptic bronchoscopy in Hainan Cancer Hospital from April to August of 2020 were included in this study. For each patient, bronchoscopy was only started when the eyelash reflex disappeared and MOAA/S score was<1 after a trial dose of remimazolam tosilate combined with 0.1 μg/kg sufentanil was intravenously given. The dosage of remimazolam tosilate for the first patient was 0.18 mg/kg, based on which the dosages for the following patients were increased or decreased by 1∶1 times for one another, forming an equal ratio sequence. A maintenance dose of remimazolam tosilate was pumped intravenously in a rate of 1 mg/(kg·h) during the bronchoscopic examination and treatment. The result of the sequential trial, the time to achieve proper sedation, the analepsia time and the adverse effects were recorded. Results: All the 50 patients went through bronchoscopy completely. The regression function of the sequential trial was Y=12.589+16.593X, the ED50 and the ED95 of remimazolam tosilate were 0.174 (95%CI: 0.162-0.186) mg/kg and 0.219 (95%CI: 0.199-0.312) mg/kg, respectively. The time to achieve proper sedation was (50±11) s and the mean analepsia time after the use of flumazenil was (56±16) s. There was one patient with respiratory inhibition, one with headache and dizziness, one with fatigue among the 50 patients. Conclusions: The strategy of moderate-to-deep sedation based on remimazolam tosilate is safe and effective in bronchoscopic examination and treatment. When combined with 0.1 μg/kg sufentanil, the ED50 and the ED95 of remimazolam tosilate are 0.174 mg/kg and 0.219 mg/kg, respectively.

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