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Coronary artery disease is alternatively called Arteriosclerotic heart disease Incidence of Coronary artery disease (CAD) the commonest. It is the most important cause of death in the United States in both men and women. Heart is the main pumping station of blood in the body. From aorta the oxygenated blood is pumped all over the body via arteries. Arteries enter into respective organs break into capillaries, where exchange of gases through permeable walls of capillaries is facilitated. Later after delivering oxygen the deoxygenated blood returns to the heart through vena cava. From heart blood goes to lungs through pulmonary vein for oxygenation. So heart is a muscular organ which is just concerned with circulation of blood all over the body.