Remimazolam in High Risk ERCP Patients

Inclusion Criteria: * Male and female subjects aged between 20 and 90 years old; * ASA (American Society of Anesthesiologists) class III to IV; * Body Mass Index (BMI) between 18 and 30 kg/m². Exclusion Criteria: * Uncontrolled hypertension or hypotension, or clinically significant coronary artery atherosclerosis heart disease or heart failure; * Severe respiratory system disorders; * Severe sinus bradycardia, heart conduction block, frequent ventricular arrhythmias, or atrial fibrillation; * Clinically significant coagulation disorders; * End-stage liver failure or kidney disease requiring dialysis; * Emergency surgery; * Peripheral artery disease with upper limb functional impairment; * Other conditions deemed inappropriate by the investigator, including patients with superficial pharyngeal cancer for whom rapid extubation is not suitable during ERCP.