After a patient has had a coronary angiogram, if the coronary arteries are mildly atherosclerotic, a stent is usually not necessary. If severe stenosis is found, a stent can usually be placed immediately. The purpose of a coronary angiogram is usually to accurately assess the condition of the lesion and thus guide the next step in an accurate treatment plan. If a patient develops mild atherosclerosis in the coronary arteries after coronary angiography, the patient can control the condition with medication, which usually results in a favorable outcome, so stenting is usually not necessary. If the stenosis is more than 70% after coronary angiography, or if there is an acute myocardial infarction, stenting can usually be done immediately. Whether or not a stent is needed after coronary angiography, patients should be under the guidance and advice of their doctors.