Coronary angiography usually takes about 30 minutes, because of the technician’s proficiency, their own vascular conditions and other factors, the time will be shorter or longer accordingly. Coronary angiography, as the gold standard for diagnosing coronary artery disease (coronary atherosclerotic heart disease), is widely used in clinical practice, and is mainly capable of assessing the number of coronary arteries, their alignment, and malformations; evaluating the presence or absence of coronary artery pathology, stenosis, and the degree of stenosis; and evaluating the presence or absence of functional changes in the coronary arteries. If the patient is to be diagnosed with coronary artery disease, or if there are symptoms of myocardial ischemia, or if the electrocardiogram or load test suggests the possibility of myocardial ischemia, coronary arteriography can be used to make a definitive diagnosis. Coronary arteriography is performed by local anesthesia near the strongest point of radial artery pulsation, and then a catheter is inserted into the opening of the radial artery to deliver a contrast medium to the opening of the coronary artery for imaging. The whole procedure usually takes about 30 minutes to complete, but the cooperation between the medical staff, the skill of the technician, the condition of the patient’s own blood vessels, and the presence or absence of emergencies during the procedure will all affect the duration of the imaging procedure.