A Full-Term Newborn Is Evaluated in the Delivery Room Due

A full-term newborn is evaluated in the delivery room due to mild tachypnea and cyanosis immediately after birth.  Fetal ultrasonography performed during pregnancy revealed transposition of the great arteries.  Heart rate and blood pressure are normal.  Oxygen saturation is 72%.  Cyanosis is apparent in the hands, feet, lips, and tongue.  Peripheral pulses are strong.  Bedside echocardiography confirms the prenatal diagnosis; there is also a small patent foramen ovale and a small patent ductus arteriosus.  Definitive surgical correction of the main congenital abnormality is planned.  Pending definitive repair, which of the following temporary measures would be most likely to improve this patient's condition?

A) Ablating the sinoatrial node
B) Administering 100% oxygen
C) Administering digoxin
D) Enlarging the patent foramen ovale
E) Ligating the patent ductus arteriosus

Correct Answer:

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