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The Ductus Arteriosus is a passage that connects the aorta to the pulmonary artery. It is usually opens before birth and closes after birth. Patent ductus arteriosus (PDA) is a condition in which the ductus arteriosus in appropriately remains open after birth. After birth, this passage allows blood to pass from the aorta into the pulmonary artery. This oxygenated blood normally travels to supply the body. The higher pressure in the aorta pushes blood through the PDA into the pulmonary artery and back into the lungs. PDAs may be surgically repaired by tying the vessel closed or by using a catheter device. This restores the normal pattern of blood flow.
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