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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 Heart With Patent Ductus Arteriosus. The ductus arteriosus is a blood vessel that connects a baby's aorta and pulmonary artery while the baby is in the womb. This connection allows blood to be pumped from the right side of the heart straight to the aorta, without stopping at the lungs for oxygen.ffects of Patent Ductus Arteriosus. Full-term infants. A small PDA might not cause any problems, but a large PDA likely will cause problems. The larger a PDA is, the greater the amount of extra blood that passes through the lungs.