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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 a wide muscular blood vessel joining the pulmonary artery (main artery to the lungs) to the aorta (main artery to the body). This connection allows blood to be diverted from the lungs into the aorta during fetal development since the baby does not breathe until after delivery.