Coronary heart disease is a heart disease caused by atherosclerotic lesions in the coronary arteries, resulting in narrowing or blockage of the arterial lumen, which further leads to insufficient blood and oxygen supply to the heart muscle, or even necrosis. Some patients come to inquire, occasional symptoms of chest tightness is coronary heart disease? In fact, the diagnosis of coronary heart disease is not so simple, then how to clarify coronary heart disease? What does the specific diagnosis include? In fact, the diagnosis of coronary heart disease is also a complex process, generally include: clinical manifestations, electrocardiogram, dynamic electrocardiogram, exercise load test, laboratory tests, cardiac ultrasound, coronary artery imaging and other means of examination. 1, the clinical manifestations of coronary heart disease chest tightness, chest pain, panic and other symptoms are common clinical manifestations of coronary heart disease, the typical angina pectoris manifestation: intense exertion or mental stress when the sternum or precordial region of boring pain, or tightening pain, and to the left shoulder, the left upper arm radiation, lasts for 3-5 minutes, after containing the “fast-acting rescue pill” nitroglycerin “Nitroglycerin” or after rest. Atypical cases may present with toothache, headache, back pain, etc. associated with activity and exertion. Myocardial infarction is a more serious type of coronary heart disease than angina pectoris, which is mainly characterized by angina pectoris with long duration and severe symptoms, accompanied by sweating and a sense of dying. 2.Electrocardiogram and dynamic electrocardiogram Electrocardiogram is the most commonly used and basic diagnostic method in the diagnosis of coronary heart disease. The electrocardiogram is easy to use, and when patients have angina pectoris or suspected angina attack, they should complete the electrocardiogram examination in the nearest clinic hospital in time, so that they can promptly capture the abnormal electrocardiogram changes during the onset of the symptoms. Ambulatory electrocardiography is also important in the diagnosis of coronary artery disease, as it can continuously and dynamically monitor changes in the electrocardiogram and effectively capture abnormal changes in the electrocardiogram during the onset of the disease, as well as observing whether there is any ischemia. Regardless of the type of coronary heart disease, ECG will provide clinicians with clues to diagnose the disease. 3, exercise load test The test, also known as ECG exercise load test, is to increase the cardiac load by running exercise and observe the changes in ECG, which is one of the most important methods of clinical assessment of coronary heart disease for patients known or suspected of suffering from myocardial ischemia. Thus, it is recognized as an important clinical cardiovascular disease examination means. 4, laboratory tests In laboratory tests, myocardial necrosis markers are particularly important, especially in patients with myocardial infarction, is one of the important means of diagnosis and differential diagnosis of acute myocardial infarction. It is one of the important means for diagnosis and differential diagnosis of acute myocardial infarction. Clinically, according to the dynamic change and elevation of myocardial necrosis markers, it can be used to determine the time of myocardial infarction, the area of myocardial necrosis, and the prognosis of myocardial infarction. 5, cardiac ultrasound cardiac ultrasound in the diagnosis of coronary heart disease is of great significance, especially for the diagnosis of myocardial infarction and differential diagnosis of patients with important value, can be on the cardiac structure and morphology, ventricular wall movement, heart valves and left ventricular function examination, is currently one of the most commonly used means of examination. 6.Coronary artery imaging mainly includes coronary CTA and coronary angiography. Coronary CTA is a kind of intravenous injection of appropriate contrast agent, the use of spiral CT scanning of coronary arteries, so as to understand the coronary artery stenosis, stenosis of the site, degree, scope, etc., which is a simple, effective and non-invasive coronary artery early diagnosis and prediction of one of the methods of coronary artery disease, and coronary artery angiography is the current diagnosis of coronary heart disease, the “gold standard! Coronary angiography is currently the “gold standard” for coronary heart disease diagnosis. Coronary artery imaging is the “gold standard” for the diagnosis of coronary artery disease. It not only clarifies the location, degree and extent of coronary artery stenosis, but also guides the measures that should be taken for further treatment. 7, other tests, including myocardial nuclear imaging, cardiac blood pool imaging, etc., myocardial nuclear imaging can show the ischemic area, clear ischemic site and range of size, combined with exercise test and then imaging, can improve the detection rate. Cardiac blood pool imaging can be used to observe the dynamic image of contraction and diastole of the ventricular wall, especially the left ventricular motion, which has certain clinical reference value for the ventricular wall motion and systolic and diastolic cardiac function after myocardial infarction.