Heart surgery usually includes the following types: 1. stent surgery: when the heart has severe stenosis, heart stent surgery is performed, which is relatively simple and less damaging. 3. Pacemaker surgery: for patients with severe bradycardia, weak heart contraction and cardiac arrest, usually placed on the left anterior chest wall; 4. Artificial heart implantation: when a heart transplant patient is waiting for a donor, if the heart is already unable to work, an artificial heart can be implanted first, because the artificial heart has not completely solved the anticoagulation and anti-rejection problems. Because the artificial heart has not yet fully solved the problems of anticoagulation and anti-rejection, the safe use time of the artificial heart is currently 6 months.