I. Preoperative preparation of the patient. Preoperative medications: midazolam, scopolamine, morphine. II. The patient enters the operating room. Connect the monitor, check that the anesthesia machine, oxygen, intubation equipment, emergency equipment and drugs are intact. 1. Preparation of appliances: adjust the parameters of the anesthesia machine, adjust the parameters of the monitor, turn on the oxygen, connect the threaded tube, artificial nose, mask, carbon dioxide detector, tracheal tube, laryngoscope, dental pad, adhesive tape, paraffin oil, stethoscope, tee, heparin water, transducer, arterial indwelling needle, hand pad, gauze bandage, local anesthetic, sterile iodophor, central venous kit, micropump, ACT machine, blood gas machine, pressurized bag; 2. Drug preparation: midazolam, scopolamine, etomidate, fentanyl, vecuronium bromide, propofol, sevoflurane, dopamine, dobutamine, atropine, norepinephrine, phenylephrine, epinephrine, amrinone, milrinone, nitroglycerin, esmolol, sodium nitroprusside, phentolamine, propafenone, nicardipine, magnesium sulfate, calcium chloride, potassium chloride, heparin, fisetin; 3. Arterial puncture fixation and measurement of direct arterial pressure. Do arterial blood gas; 4. Induce general anesthesia, fix tracheal intubation, connect ventilator. Open sevoflurane, anesthesia maintenance; 5. Central venous puncture placement, pressure measurement, connect emergency medicine. Connect micro-pump, anesthesia maintenance; 6, start disinfection laying sheet; 7, deepen anesthesia, start surgery; 8, deepen anesthesia, stop breathing, open threaded tube, split sternum; 9, give heparin, measure ACT after 5 minutes; 10, pay attention to the process of surgical operation, pay attention to the impact of cardiac stent, pull hook, lateral wall clamp on circulation, deal with abnormalities; 11, surgery is about to end, give ichthyospermone before closing chest, measure ACT after 10 minutes. Measure ACT after 10 minutes; 12. At the end of the operation, send to the monitoring room and hand over the shift.