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The left main coronary artery arises from above the left portion of the aortic valve and then usually divides into two branches, known as the left anterior descending (LAD) and the circumflex (Circ) coronary arteries. In some patients, a third branch arises in between the LAD and the Circ.
Definition. A patent ductus arteriosus (PDA) is a type of congenital (present at birth) heart problem. All babies have a small passageway (called the ductus arteriosus) connecting the pulmonary artery and the aorta, which is open at birth.The pulmonary artery is a blood vessel that moves blood from the heart to the lungs. The aorta is a blood vessel that moves blood from the heart out to the rest of the body.ll babies have a small passageway (called the ductus arteriosus) connecting the pulmonary artery and the aorta, which is open at birth. The pulmonary artery is a blood vessel that moves blood from the heart to the lungs. The aorta is a blood vessel that moves blood from the heart out to the rest of the body.