Simple stenosis of a blood vessel and myocardial ischemia are usually not enough to be fatal. Most of the symptoms of angina after a narrowing of a blood vessel do not last long, such as a few minutes or ten minutes before they are relieved. If the narrowing of a blood vessel reaches the point of sudden occlusion, it leads to a myocardial infarction. After myocardial infarction, due to the sudden interruption of blood flow, the myocardium in the area of blood supply to gradually necrosis, once to this extent, there may be malignant arrhythmia, the heart may rupture, heart failure, shock and a series of other conditions. Therefore, if you consider suspecting myocardial ischemia, you need to clarify the situation as soon as possible, for example, to do imaging to determine the degree of stenosis. If the degree of stenosis is severe, active intervention is needed, and if the stenosis is not severe, it is treated with medication. If once there is severe chest pain, it is suspected that there may be myocardial infarction, and it is necessary to go to a hospital with the ability to do stenting as soon as possible, so as soon as possible to open the blood vessels to save lives.