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Patent ductus arteriosus (PDA) is a persistent opening between two major blood vessels leading from the heart. The opening, called the ductus arteriosus, is a normal part of a baby's circulatory system before birth that usually closes shortly after birth.
The ductus arteriosus is very important in the adaptation process. The ductus arteriosus is a normal, small communicating blood vessel beside the heart, connecting the pulmonary artery (which carries blood to the lungs) and the aorta (which carries blood to the rest of the body). Before birth, most of the blood from the fetal heart bypasses the fetal lungs via the ductus arteriosus.