To evaluate the effect of ciprofol anesthesia Induction on hemodynamics in elderly patients undergoing elective noncardiac surgery，a prospective, randomized, controlled trial.

90 elderly patients undergoing noncardiac surgery were randomly divided into propofol group and ciprofol group, who were given propofol 1 ~ 2mg/kg or ciprofol 0.2-0.5mg/kg during anesthesia induction respectively. Systolic blood pressure (SBP), diastolic blood pressure (DBP), heart rate (HR) and BIS values at various time points during anesthesia induction were collected. At the same time, rates of injection pain, muscle fasciculation, arrhythmia, cough and perioperative hepatic and renal functions were compared between the two groups. The primary outcomes were the fluctuations in hemodynamic parameters during induction. The secondary outcome were adverse reactions, BIS values and changes of hepatic and renal functions during induction.

Inclusion Criteria:

1. ASA physical status Ⅰ-Ⅲ
2. Age over 65 years;
3. Body mass index (BMI) 20 ~ 30 kg/m2 ;
4. Elective noncardiac surgery;

Exclusion Criteria:

1. The patient or his/her family refused to participate in the clinical trial;
2. Severe heart, lung, liver or kidney dysfunction;
3. Expected difficult airway, requiring awake tracheal intubation;
4. Those who are allergic to the drugs used in this study;
5. Unsuccessful tracheal intubation twice;
6. Patients with mental illness or impaired consciousness;

We plan to upload and share data with other researchers. Protecting patient privacy when sharing patient-level data from clinical trial

study protocol and Informed Consent Form will available before 2024/1/1 Statistical Analysis Plan and Clinical Study Report will available before 2024/6/1

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