Review Question - QID 210044

A 12-hour-old newborn is urgently transferred to the neonatal intensive care unit because he is found to be cyanotic and appears blue in all four extremities. He was born to a 42-year-old G1P1 mother who underwent no prenatal screening because she did not show up to her prenatal care visits. She has poorly controlled diabetes and hypertension. On physical exam, the infant is found to have slanted eyes, a flattened head, a large tongue, and a single palmar crease bilaterally. Furthermore, a single, loud S2 murmur is appreciated in this patient. Radiography shows a large oblong-shaped heart shadow. Based on this presentation, the neonatologist starts a medication that will temporarily ensure this patient's survival pending definitive fixation of the defect. The substance that was most likely administered in this case also has which of the following effects?