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