Review Question - QID 109733

A G1P0 woman gives birth to a boy at 38 weeks' gestation. The child's height and weight are in the 10th and 12th percentiles, respectively. The mother's past medical history is notable for poorly controlled diabetes mellitus and bipolar disorder. Twenty-four hours after birth, the child is noted to have blue extremities in the newborn nursery. His temperature is 99.3°F (37.4°C), blood pressure is 72/40 mmHg, pulse is 130/min, and respirations are 28/min. He is breathing rapidly with nasal flaring and intercostal retractions. A loud S2 is heard with a continuous murmur. A chest radiograph is shown in Figure A. The child is taken to the neonatal intensive care unit. Which of the following is most appropriate to administer to this patient?