Procedure of heart surgery After general anesthesia, the patient will be completely unconscious. The chest cavity is opened to reveal the heart, and a tube connecting the heart to the artificial heart-lung machine is used to introduce blood into the artificial heart-lung machine, which temporarily replaces the human heart and lungs to sustain life with the help of the artificial heart-lung machine, and the patient’s heart and lungs can rest completely. The doctor injects a 4°C cardioplegic fluid into the heart vessels to stop the heart, lower its temperature and supply a certain amount of energy. The intracardiac surgery officially begins. The patient’s heartbeat and breathing are restored after the cardiac surgery operation is completed. After the situation is stabilized, the artificial heart-lung machine is stopped and the tube connecting the patient to the artificial heart-lung machine is removed. The procedure is completed. The patient is safely transported to the post-operative cardiac care unit.