Induction: 0.01~0.03 mg/kg of midazolam, 0.2~0.4μg/kg of sufentanil, 1~2 mg/kg of propofol and 0.6~0.9 mg/kg of rocuronium are injected intravenously for anesthesia induction. After the completion of endotracheal intubation, the internal jugular puncture catheterization is undergone at the right side to monitor the central vein pressure.