Cardiovascular stenosis 99% without stenting may affect the function of cardiovascular tissues, malignant arrhythmia, and even sudden death. 1. Affecting the function of cardiovascular tissues: cardiovascular stenosis 99% indicates that the cardiovascular already exists serious stenosis, if the stent is not placed, it may cause a reduction in the blood flow of the blood vessels, and the tissues supplied by its blood vessels may become ischemic and necrotic due to the lack of blood supply, which affects the harm of cardiovascular tissues’ function. 2. Malignant arrhythmia: If the coronary arteries and other important blood vessels are blocked, it may also cause more serious arrhythmia, which threatens the life and health of people. 3. Sudden death: cardiovascular stenosis is serious when the possibility of coronary artery occlusion, may cause sudden death of the patient. Cardiovascular stenosis 99% should go to the hospital to do a comprehensive examination, follow the doctor’s instructions for treatment.