Cardiac angiography takes about half an hour. Cardiac angiography, or coronary angiography, is the gold standard for the examination of large coronary artery lesions. Coronary angiography is a minimally invasive test in which a guidewire catheter is usually placed from the radial artery at the end of the upper extremity as a puncture point to the coronary artery opening at the root of the aorta, where contrast is injected to show the heart vessels. This procedure takes about 15 minutes. From the time the patient is on the operating table to the time the medical staff changes gowns, lays down towels, and disinfects until the procedure is done, the entire process takes about half an hour, and may take less for skilled physicians. The distribution of the coronary arteries can be clarified by coronary angiography, which generally has a right dominant pattern. The purpose of coronary angiography is to clarify whether there is a stenosis in the coronary arteries, as well as which vessel is stenosed and to what extent. If the degree of stenosis in a single coronary artery is more than 75%, stenting is recommended.