Interrupted aortic arch (IAA) is a rare type of congenital heart disease in which there is a disruption in the blood flow between the ascending and descending aorta due to the aorta being incomplete or interrupted. This disruption makes is so the heart cannot send blood through the aorta. The aorta is the main, largest artery and is located in the middle of the body’s trunk. The aortic arch is the curved section of the aorta at its top. Babies that are born with interrupted aortic arch also often have other congenital heart and blood vessel defects, such as an atrial septal defect or transposition of the great arteries.