Electrocardiogram, Exercise Test, Doppler Ultrasound, Myocardial Nuclear Scan, Coronary Artery Angiography …… Faced with a forest of diagnostic tests for coronary artery disease, patients are often at a loss as to what to do. In the end, which test should be chosen, which test has the highest diagnostic accuracy, and how to check the least dangerous? Electrocardiogram (ECG) People are certainly no strangers to ECG. Even if they don’t have a heart condition, many of them have had them done during routine medical checkups. ECG records the bioelectrical signals from the heart and is an effective way to diagnose arrhythmia, myocardial infarction, and heart valve disease. When the heart is damaged or necrotic due to ischemia, the changes can be reflected on the ECG in time, providing doctors with a basis for diagnosing the disease. However, the ECG we usually do, that is, the resting ECG, the tracing time is only a few minutes, sometimes does not reflect the real face of coronary heart disease, and even sometimes even if the ECG is normal, can not be completely excluded from coronary heart disease, this time we have to seek the dynamic electrocardiogram (that is, the “Haut”) and the help of the exercise test. Dynamic electrocardiogram is like a small “Walkman” which is very convenient for patients to carry around, and it can continuously record the electrocardiogram for 24D72 hours to capture the signals of arrhythmia and myocardial ischemia. Exercise test is to induce myocardial ischemia when physical condition permits, so as to determine the condition more accurately. Myocardial Nuclear Scan An echocardiogram performed under load can help diagnose coronary artery disease by detecting myocardial ischemia through ultrasound. It also evaluates the prognosis of myocardial infarction, the risk of non-cardiac surgery and the results of reperfusion surgery, as well as determining all complications of acute myocardial infarction. In addition, doctors may also recommend CT, MRI and myocardial nuclear scanning. In fact, these are common types of heart scans, especially myocardial nuclear scanning, which is commonly used in the diagnosis of coronary artery disease, as it is more sensitive and specific than the various electrocardiograms in the diagnosis of coronary artery disease. Coronary arteriography All of the previously mentioned tests have a common advantage, that is, the test method is safe, basically no harm to the human body; but there is also a common disadvantage, that is, the diagnosis of coronary heart disease sensitivity and specificity are not ideal. Coronary angiography can make up for the defects in this area, has been recognized by industry experts as the diagnosis of coronary heart disease “gold standard”. However, because coronary angiography is a kind of “traumatic examination”, so if you want to do, must meet certain indications. First of all, there are coronary heart disease risk factors or suspected coronary heart disease need to be clearly diagnosed; secondly, coronary heart disease patients seeking further effective treatment, need to understand the coronary artery lesions in more detail; finally, to determine the severity of coronary heart disease, evaluation of the prognosis. Do coronary angiography, complications have been one of the important reasons why patients tramp, in fact, according to relevant statistics show that its incidence is only about 1%, there is no need to worry too much. However, it is always better to choose a regular and experienced hospital for the examination.