In a healthy heart, both the left and right coronary arteries branch off the aorta. The aorta is the major artery that carries this oxygen-rich blood from the heart to the rest of the body. In a heart with anomalous (abnormal) origin of the pulmonary artery, the left or right coronary arteries branch off the pulmonary artery and carries blood from the heart to the lungs instead. Due to this congenital (present at birth) condition, not enough blood