The persistence of a PDA is much more common in preterm than term infants.[2] This is secondary to the immaturity of the ductus.[3] Since the advent of echocardiography, the incidence of PDA in children born at term has been reported as approximately 1 to 2 per 1000.[4] This estimate is higher than previously thought since it includes clinically silent PDAs.[5] This higher estimate comes with inclusion of clinically silent PDAs.[5] There is globally a higher incidence in females as well as in children born at higher altitudes.[6][7]

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