Except for left main lesions, 70% of stenoses are critical lesions, which can be treated by stenting or long-term medication. Severe stenosis of the coronary arteries generally has the following consequences: 1. angina attacks, limiting the amount of activity and affecting the quality of life; 2. acute myocardial infarction, a more dangerous situation; 3. ischemic cardiomyopathy, heart enlargement, breathing difficulties or worse after a long time. If the economic condition is still possible, hoping to achieve a higher quality of life, it is recommended to put in a stent, of course, there are certain risks, as flying is not absolutely safe. Of course, it is not the case that the disease is cured after the stent is put in, but the treatment of coronary heart disease is still a long way away: long-term medication, diet control, control of underlying diseases, healthy lifestyle, etc.