A 90% blockage of the anterior descending vessels of the heart is dangerous. The anterior descending branch is the most important branch vessel of the coronary arteries and is responsible for supplying blood to the anterior wall of the left ventricle, the anterior 2/3 of the interventricular septum, and part of the right ventricle. If it becomes blocked, it can cause a more extensive anterior myocardial infarction, and patients will soon experience a severe decline in cardiac function, which may be combined with the formation of ventricular wall tumors in some patients, resulting in a very poor prognosis. A 90% blockage of the anterior descending branch of the heart is considered a severe blockage and is very dangerous. Patients may have frequent angina symptoms, and the chance of acute myocardial infarction is significantly higher, patients must go to the hospital in time for treatment. The treatment of 90% blockage of the anterior descending branch of the heart is mainly to strive to lift the stenosis. Coronary stent implantation can be taken to treat the blocked part of the anterior descending branch by means of stenting, and if combined with other blood vessel stenosis, coronary artery bypass grafting surgery can be done for treatment. Both of the above treatments can improve coronary blood flow. On the basis of surgical treatment, it is also necessary to adhere to long-term medication, such as aspirin or clopidogrel, as well as statin lipid-lowering drugs, beta-blockers and so on. The anterior descending branch of the heart blood vessels blocked 90% is very dangerous, to actively intervene in the treatment, the specific treatment and medication need to follow the doctor’s instructions.