The statement that the most terrible complication after cardiac stent surgery is unscientific. Most of the complications after this kind of surgery are more serious, such as re-stenosis of the coronary artery lumen, malignant arrhythmia, stent displacement and so on. 1. Coronary artery lumen re-stenosis: it may be related to the occurrence of arterial occlusion after the operation, which will further cause angina pectoris and myocardial infarction if left untreated. If coronary artery lumen narrowing occurs again after surgery, oral vasodilator drugs, such as nitroglycerin, isosorbide mononitrate, etc., should be taken as prescribed by the doctor. 2. Malignant arrhythmia: some patients may suddenly have panic attacks, rapid heartbeat and chest tightness after cardiac stent implantation, which will affect their normal life and make them prone to sudden death if not dealt with in time. At present, it is necessary to pay attention to rest, and if repeated episodes occur, you can follow the doctor’s instruction to take anti-arrhythmic drugs orally, such as metoprolol succinate, bisoprolol and so on. 3. Stent displacement: After installing a cardiac stent, the stent may be displaced, but if there is a blood flow shock and the stability of the stent is not affected, no special treatment can be done. However, if there is no blood flow impact and the stent is not affected, the stent can be removed and reinserted in a timely manner. After heart stent surgery, it is also necessary to go to the hospital for regular checkups, so that you can know the exact position of the stent and carry out post-care according to your personal situation.