Case 2: Wide-Complex Tachycardia in a Newborn

Twelve hours after birth, an otherwise healthy newborn infant is noted to have an irregular pulse during routine examination in the well-child unit. The infant was born at term after an uncomplicated pregnancy and vaginal delivery. An electrocardiogram (ECG) reveals frequent single premature wide complexes corresponding to the pulse irregularity. The infant has good perfusion, easily palpable pulses in all 4 limbs, and no murmur. He is afebrile …