The PDA is a congenital disorder of the heart where the neonatal ductus arteriosus, a conduct that connects the aorta and the pulmonary artery, fails to close after birth. Typically, this closure occurs within the first 3 days of life. Persistence of a PDA causes large blood flow to the lung vasculature and increased cardiac work. Early symptoms are uncommon, but during the first year of life may include increased work of breathing and poor weight gain. If not corrected, a large PDA may lead to congestive heart failure.