Anesthesia induction
Patients were required to fast for 8 h before the procedure. Both the electrocardiogram (ECG) and the finger pulse oxygen saturation were monitored, and intravenous access was performed on a regular basis. To monitor blood pressure and collect blood samples, radial artery cannulation was performed under local anesthesia. The three groups used the same method for anesthesia induction. Anesthesia was administered via intravenous rapid induction to each group. Propofol 1.5–2 mg·kg