If the three branches are not completely blocked, there is no myocardial infarction for the time being, but it is a very high-risk group for myocardial infarction, and once it is completely blocked a large infarction will occur. Coronary artery is also known as the artery of the heart has three large blood vessels, one on the right side is called the right coronary artery, the left side has two, the left front is called the anterior descending branch, the left rear is called the circumflex branch. If all of them are narrowed, it may lead to myocardial ischemia, which may induce angina pectoris or even heart failure. If one or both of them are completely blocked, myocardial infarction may occur, and if no timely and effective rescue treatment is provided, the patient will die quickly in a short period of time. It is recommended that patients seek timely medical treatment, according to the specific conditions under the guidance of the doctor active treatment to prevent myocardial infarction.