A 5-month-old infant with poor feeding and recurrent respiratory infections presents for evaluation. On examination, there is a holosystolic murmur at the left lower sternal border, and echocardiography confirms a large ventricular septal defect (VSD). What is the next step in management?
A newborn is noted to have cyanosis that worsens with crying. A systolic ejection murmur is audible, and echocardiography confirms Tetralogy of Fallot (TOF). Which of the following interventions is most likely to improve the cyanosis during a "Tet spell"?
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