Coronary angiography, also known as coronary angiogram or cardiac catheterization, is the invasive imaging of the heart arteries using a contrast medium and X-rays. Coronary angiography is the most reliable method for assessing stenosis or blockage of the heart arteries and is usually performed through the radial artery in the arm or, less frequently, through the femoral artery in the leg. In the case of finding a stenosis or blockage in a coronary artery, the treatment is called angioplasty, which is performed either during the same procedure or at a later time, depending on the complexity of the coronary artery disease. Angioplasty is the opening of the stenosis/blockage with a balloon, and in the majority of cases, it is followed by the placement of an intravascular stent. The duration of the procedure depends on the complexity of the stenosis and usually lasts from 30 minutes to 2 hours.