Myocardial infarction generally refers to myocardial infarction, and ICD refers to implantable cardioverter-defibrillator. Generally, ventricular fibrillation after myocardial infarction does not require the installation of an implantable cardioverter-defibrillator, but if ventricular fibrillation occurs frequently after myocardial infarction, an implantable cardioverter-defibrillator is required. The need for an implantable cardioverter defibrillator after myocardial infarction is determined by the time of the myocardial infarction. In general, it is not recommended to install an implantable cardioverter defibrillator for patients who experience occasional ventricular fibrillation or ventricular tachycardia after myocardial infarction. Because the electrical activity is unstable in the early stages of myocardial infarction, patients may experience various types of arrhythmias, and if timely measures are taken to treat them, the electrical structure of the heart can be improved and the electrical activity of the heart will be stabilized. If ventricular fibrillation or supraventricular tachycardia recurs after myocardial infarction, an implantable cardioverter-defibrillator is required. The need for an implantable cardioverter defibrillator after a myocardial infarction is determined by the patient’s doctor.