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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.
TEXT. Description. Persistent patency of the ductus arteriosus, or patent ductus arteriosus (PDA), is the second most common congenital heart disease, affecting approximately 1 in 1,600 to 5,000 live births in the U.S. (Mitchell et al., 1971).