Ciprofol vs Propofol for Reducing Hypoxia Incidence in ERCP

Inclusion Criteria: * patients undergoing ERCP, ASA I-III * normal renal function * BMI ≥ 18kg/m 2 and ≤ 30kg/m 2 Exclusion Criteria: * Previous serious cerebrovascular accidents and other neurological diseases * mental diseases, long-term use of drugs that affect the function of the central nervous system, benzodiazepines or opioids * history of anesthetic allergy * preoperative hypotension or preoperative SpO2 \< 90%, or chronic respiratory failure * patients suspected of having difficult airways * screening for drug addiction and alcohol abuse within the first 3 months (\> = 6standarddrinks/day) * patients diagnosed with severe cardiopulmonary disease, or respiratory or respiratory diseases such as sleep apnea syndrome; * bradycardia or atrioventricular block. * participate in other clinical trials within 4 weeks; * cognitive or communication abnormalities determined by the researchers; * emergent and critical conditions during the operation; * other conditions that the researchers believe are not suitable to participate in the study.