In response to the common questions about coronary heart disease, I would like to popularize the medical knowledge of coronary heart disease. Coronary heart disease refers to myocardial dysfunction and/or organic lesions caused by narrowing of coronary arteries and insufficient blood supply, also known as ischemic heart disease. Its main predisposing factors include hypertension, diabetes, obesity, etc. It is one of the diseases with the highest mortality rate worldwide. Clinically, there are five main types of coronary heart disease, including asymptomatic, angina pectoris, myocardial infarction, ischemic cardiomyopathy, and sudden death. Patients can be life-threatening at any time if left untreated, and some patients with coronary heart disease often have sudden death as the first symptom of the disease. Diagnosis of coronary heart disease is firstly based on the patient’s symptoms and signs to make a preliminary judgment, and then with the help of instruments to make further diagnosis: 1, electrocardiogram: electrocardiogram is the most common and basic means to diagnose coronary heart disease. When the patient’s condition changes, the abnormality can be captured in time and quickly, so that the load test can be carried out better; 2.Coronary angiography: coronary angiography is called the “gold standard” for the diagnosis of coronary heart disease, which can clarify the presence or absence of coronary artery stenosis and the degree and extent of stenosis, and further treatment can be taken according to the results; 3.Myocardial enzymatic examination: This is an important tool for the diagnosis and differentiation of acute myocardial infarction. Should I do coronary angiography or cardiac CT? As an imaging tool for coronary lesions, coronary CT has similarity with coronary angiography. However, compared to coronary CT, coronary angiography allows simultaneous intervention for suitable lesions, whereas coronary CT can only be used as a routine screening tool for coronary artery disease. In short, coronary angiography should be preferred for patients with high clinical suspicion of coronary artery disease and who may require simultaneous interventional treatment, which has the advantage of avoiding secondary examinations. The specific differences between coronary angiography and cardiac CT can be found in the following table: Indications for coronary angiography: The indications for coronary angiography are divided into two main categories: one for diagnostic purposes and the other for therapeutic purposes. The main purpose of “diagnosis”: 1, unexplained chest pain, chest tightness, suspected coronary heart disease; 2, unexplained arrhythmia; 3, unexplained left heart insufficiency; 4, recurrence of angina after intervention or transplantation; 5, congenital heart disease and valve disease before major surgery, age > 50 years; suspected coronary heart disease of high-risk Occupational groups, such as pilots, drivers, firefighters, etc. For the purpose of “treatment”: 1. stable angina or old myocardial infarction; 2. asymptomatic coronary artery disease; 3. high risk groups such as successful resuscitation of primary cardiac arrest; 4. recurrence of angina after transplantation or interventional treatment; We need to note that any examination has certain side effects, such as the release of large amounts of strong radiation. Clinically, for the sake of the patient’s health, the examination should not be abused or not necessary.