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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.
patent ductus arteriosus patent ductus arteriosus pda is a condition in which the ductus arteriosus does not close the word patent means open the ductus arteriosus is a blood vessel that allows blood to go around the baby s lungs before birth soon after the infant is born and the lungs fill with air the ductus arteriosus is no longer needed it most often closes in a couple of days after birth if the vessel doesn t close it is referred to as a pda