Inova Children's Hospital
Interrupted aortic arch (IAA) is a problem where the aorta has an absent portion. This keeps the blood from reaching the lower body because the aorta is “interrupted." The absent portion can be anywhere along the top curved part of the aorta. A baby born with IAA may appear okay until the patent ductus arteriosus (PDA) closes after birth. The PDA can provide blood flow to the lower body until it naturally closes within a few hours to days after birth. At that time, no blood will reach the lower body and the infant will go into shock, with no blood reaching the legs, kidneys and intestine.