Efficacy and safety of remiazolam combined with remifentanil hydrochloride in painless bronchoscopy

INTERVENTION: RR group:Remazolam besylate combined with remifentanil;PR group:Propofol combined with remifentanil; CONDITION: painless bronchoscopy PRIMARY OUTCOME: Incidence of intraoperative respiratory depression; SECONDARY OUTCOME: Percentage of successful operations;Safety indicators;Satisfaction score; INCLUSION CRITERIA: Patients receiving elective painless tracheoscopy; 1) Patients receiving elective painless tracheoscopy 2) Age 18 65, regardless of gender; 3) Body mass inde X(BMI): 18 30 kg · m^2; 4) American Society of Anesthesiologists (ASA): I III; 5) The operation time is within 60 min; 6) Vital signs: RR 10‐24 bpm; SpO2 >= 93% when absorbing air; SBP 90 160mmHg; DBP 60 100 mmHg; HR 55 100 bpm; 7) Subjects voluntarily participated in the trial and signed the informed consent form of the trial.