In coronary Artery Disease, the coronary arteries are gradually blocked because of atherosclerosis. The heart does not receive enough blood, oxygen and nutrition because of such blocks. This leads to Angina Pectoris or even Heart Attack. In this situation, finding the exact site of coronary artery blocks and treating them becomes the primary aim of the cardiologist. This is done by performing Coronary Angiography.
Angiography is done by cardiac catheterisation. It is a procedure that examines the heart and its vessels. During this procedure the cardiologist measures the pressures inside the heart, injects a radio opaque dye and takes the X-Ray pictures of the arteries supplying blood to the heart and assesses how well or badly the heart is pumping and whether the blood vessels are blocked. The cardiologist can also detect any wall or valve defects and other disorders of the heart.