Coronary stenosis greater than 75%, put stent. Coronary stenosis is the basis for the development of coronary artery disease and angina. The gold standard for the diagnosis of coronary stenosis is coronary angiography. Coronary angiography suggests a single vessel stenosis with more than 75% stenosis, which requires stent implantation. After stenting, secondary prevention of coronary artery disease is routinely administered orally, and dual antiplatelet drugs such as aspirin plus clopidogrel or tigretol, with clopidogrel or tigretol being taken orally for at least one year. If the coronary angiogram suggests lesions in more than two vessels, a single procedure, dealing with only one vessel, to avoid putting stents in both vessels at the same time. A long thrombus in a vessel can be life-threatening for the patient. In case of a three-branch lesion, the patient is advised to undergo coronary artery bypass surgery. If the patient does not undergo bridge surgery, coronary artery stenting can be performed in stages.