Symptoms of postoperative angina, the pain usually lasts no more than 15 minutes, the pain duration is prolonged when myocardial infarction occurs, and it can also be manifested as radiating pain such as toothache, shoulder pain, and back pain. When the heart stent implantation surgery, angina, consider the possibility of restenosis with the stent or the formation of thrombus in the stent has a certain relationship, to prevent the occurrence of heart failure, postoperative placement of stents stent restenosis of the chances of about 10%, at this time, the patient will appear chest tightness, dyspnea and other symptoms, the need to carry out another coronary angiography. The clinical symptoms of angina occurring in patients are pain in the posterior sternum or precordial region, and the duration of an angina attack due to coronary artery spasm is usually no more than 15 minutes, but if stent re-stenosis occurs within the stent and myocardial infarction is formed, the duration of the pain is significantly prolonged, and the degree of pain is severe, and can be accompanied by back pain, shoulder pain, and so on. Patients who experience angina after surgery are advised to consult the cardiology department of a regular hospital to avoid delays.