Coronary artery disease has typical symptoms, usually with anterior chest tightness and pain, the duration is usually a few minutes, rest or take nitroglycerin tablets can relieve the symptoms. The most accurate diagnosis is coronary angiography, which has the advantage of accurate results, but the disadvantage of being more expensive and invasive. The electrocardiogram usually changes when the attack occurs, and the other tests mentioned above can be done to assist in the diagnosis when the attack does not occur. Whether it is coronary artery disease or not is diagnosed just by a single ECG or ECG, usually with symptoms + positive test results (coronary CT, coronary angiography results are the most informative). So you are not coronary heart disease is still very difficult to diagnose, but the symptoms are not very typical, if you are really assured that you can do coronary CT examination to see, most of the patients who are not coronary heart disease can be concluded. As for the prevention of coronary heart disease: appropriate activities, with high blood pressure pay attention to control blood pressure, with diabetes pay attention to control blood sugar, high blood lipids, then control the level of blood lipids. Avoid smoking as much as possible.