Coronary angiography or cardiac catheterization or catheter is a diagnostic test in which images are used to study the blood vessels supplying the heart and that are not visible by conventional radiology. Is an invasive cardiology (causing pain to the patient) and is performed by inserting a catheter into an artery, usually the femoral, that through the aorta goes to the heart. whether it is a blood narrowing or blockage of the coronary arteries: With this radiographic images that provide insight into what the specific problem of the patient is obtained. Despite being a very reliable test, coronary angiography can lead to complications, such as the onset of severe arrhythmias, angina pain or heart attack. There are other techniques such as computed tomography where you can inject contrast or without it, also providing information on the location of the vessels of the affected organ.