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Atrial Septal Defect
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Patent Ductus Arteriosus
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Patent Ductus Arteriosus

Patent ductus arteriosus (PDA) is a heart problem that occurs soon after birth in some babies. In PDA, abnormal blood flow occurs between two of the major arteries connected to the heart. Before birth, the two major arteries-the aorta and the pulmonary (PULL-mun-ary) artery-…