Effects of Ciprofol on Postoperative Delirium and Outcomes in Elderly Patients Undergoing Major Thoracic Surgery

Inclusion Criteria: * Age ≥65 years old, gender unlimited; * Selective thoracoscopic lobectomy and segmental lung resection were performed, and the estimated time of anesthesia (from the beginning of anesthesia to the end of surgery) was ≥2 hours; * ASA score is Grade I \~III; (Annex 1) * A BMI of 18.5 to 29.9 kg/m2 \[BMI= weight (Kg)/height (m) 2\] (2013 U.S. Guidelines for the Management of Overweight and Obesity in Adults); * Postoperative hospital stay more than 72 hours; * Ethical, patients voluntarily take the test and sign the informed consent. Exclusion Criteria: * Emergency surgery; Hypovolemia, shock or coma; * In addition to general intravenous anesthesia, other anesthesia methods should be combined, such as inhalation anesthesia, epidural anesthesia, peripheral nerve block, etc., but it is not necessary to exclude patients with local infiltration of local anesthetic incision; * Serious cardiovascular disease, including a history of myocardial infarction within 6 months, bradycardia (resting heart rate \< 50 beats/min); Patients with hypertension whose blood pressure is not satisfactorily controlled (seated systolic blood pressure ≥160 mmHg during screening, and/or diastolic blood pressure ≥100 mmHg during screening); Sitting systolic blood pressure ≤90 mmHg during the screening period; A history of severe heart valve disease. * Abnormal liver function, AST and/or ALT≥2.5×ULN, TBIL≥1.5×ULN; * Abnormal renal function, urea or urea nitrogen ≥1.5×ULN, blood creatinine greater than the upper limit of normal; * Glycated hemoglobin (HbA1c) ≥ 8.5%, fasting blood glucose ≥180 mg/dl (10 mmol/L), blood glucose ≥270mg/dl (15mmol/L) 1 hour after meals, or blood glucose ≥216 mg/dl (12mmol/L) 2 hours after meals; * Patients with type I and type II expiratory failure * Preoperative anemia (Hb≤90 g/L), thrombocytopenia (PLT≤80×109/L), hypoproteinemia (Alb≤30 g/L); * A history of drug use and/or alcohol abuse within the 2 years prior to screening, with alcohol abuse being an average consumption of more than 2 units of alcohol per day (1 unit =360 mL beer or 150 mL of 45 mL liquor or wine with an alcohol concentration of 40%); * Patients with neurological diseases (stroke, Alzheimer's disease, Parkinson's disease, mental illness, myasthenia grave, etc., within 6 months), psychiatric diseases (schizophrenia, mania, bipolar disorder, insanity, etc.), long-term history of taking psychiatric drugs and cognitive impairment (using the simple mental State Assessment Form (MMSE scale (Annex 2)); * Patients who take sedative sleeping drugs and antiepileptic drugs for a long time; * Allergic to the investigational drug or contraindicated; * Participated in other drug clinical trials as a subject within the last 3 months; * Patients who refused or were unable to cooperate with the study; * Other conditions that the investigator considers inappropriate to participate in this study.