The infant with Tetralogy of Fallot involves four heart defects: A large ventricular septal defect (VSD). Pulmonary stenosis. Right ventricular hypertrophy and. An overriding aorta. He will be treated with digoxin to slow and strengthen the heart. Epinephrine. aminophylline. and atropine will speed the heart rate and are not used in this client; therefore. answers B. C. and D are incorrect.