After myocardial infarction stent implantation, if no abnormality occurs, it is usually not removed and will be used for life. Cardiac stenting is mainly used for the treatment of coronary lumen stenosis, which needs to be applied promptly when the stenosis is greater than 75%. It is performed mainly by placing a stent in the narrowed lumen to open the vessel, restore blood flow and save the heart muscle. When a stent is implanted, it usually does not fall out because the endothelial cells wrap around the stent. However, the stent implanted in the coronary artery is after all a foreign body and is prone to reoccurrence of blockage here, and appropriate anticoagulant medication should be taken as prescribed by the doctor after surgery. If proper post-operative care is taken and previous bad habits are improved, such as quitting smoking and alcohol, blockage usually will not occur and the stent can be used for life. Patients are advised to actively control their weight, blood pressure and blood sugar, eat a low-salt, low-fat diet, avoid staying up late and straining, take medications as prescribed by the doctor, and have regular follow-up examinations after surgery.