The parts of the heart prone to myocardial infarction are as follows: 1. The parts of the heart prone to myocardial infarction are the anterior wall of the left ventricle and the anterior ventricular septum, which are caused by lesions of the anterior descending branch of the left coronary artery. This vessel is relatively important and is the most common type of myocardial infarction in the clinic, and the hazard is that it is prone to left heart failure; 2. The lower wall of the left ventricle, usually caused by lesions of the right coronary artery, tends to be more hazardous, most often combined with severe atrioventricular block; 3. Less common sites are high lateral wall myocardial infarction, which is caused by lesions of the gyral branch of the left coronary artery, and the hazard is usually relatively small; 4. The lower wall combined with posterior wall or right ventricular infarction, right ventricular infarction often shows hypotension, even shock, right heart failure; 5, more serious extensive anterior wall myocardial infarction, even combined with high lateral wall myocardial infarction, this is often caused by the left coronary artery, the left main trunk site. The incidence of this condition is low, but often combined with cardiogenic shock, the mortality rate is extremely high, there are also many manifestations of sudden death, there is no chance to hospital resuscitation, so it is the most dangerous site.