A 10-month old infant born at 36 weeks of gestation is brought by his parents to the pediatric clinic with a complaint of shortness of breath, poor growth, and a mild fever. Physical examination revealed continuous, “machinery” murmur below the clavicle, radiating to the back and prominent precordial impulse, tachycardia, and bounding peripheral pulse. What maintains the patency of the ductus arteriosus?

1.Prostaglandins
2.Hypoxia
3.Indomethacin
4.Premature birth

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