After stenting for heart attack, the vast majority of people are in good condition after the operation. Only a small number of people, may have dangerous situations such as contrast nephropathy, cardiac tamponade, recurrent heart attack, and so on. 1. Contrast nephropathy: Usually when stenting for heart attack is performed, contrast agent is injected through the radial artery to clarify the location and degree of coronary artery blockage, and the stent is implanted into the appropriate location according to the results of the imaging; however, it may result in acute damage to the kidneys from the contrast agent within 72 hours, and in severe cases, permanent kidney damage may result. 2. Cardiac tamponade: Since stent implantation for heart attack is an interventional procedure, it may cause local damage during the operation, resulting in intrapericardial leakage, which will involve in the pericardial cavity, affecting the return blood flow as well as cardiac output, and symptoms of cardiac tamponade will appear, and in serious cases, respiratory distress, heart failure, shock, or even death will occur. 3. Recurrent infarction: Generally, after stent implantation for heart attack, it is necessary to follow the doctor’s instructions to take atorvastatin, aspirin, clopidogrel and other anti-platelet aggregation drugs; if you do not follow the doctor’s instructions to take the drugs, it may lead to thrombosis after stenting, restenosis after stenting, which will lead to recurrent infarction and so on. If you experience discomfort such as chest tightness and chest pain after stent implantation for heart attack, you should go to the hospital in time.