7-year-old Boy in Pediatrics — 7yo Child | Pediatric Cardiology | SMLE Q#18203
SMLE Question #18203
Pediatrics
Pediatric Cardiology
Objective: OBJ-283
Last updated: February 2026
A 7-year-old boy is brought to the emergency department after a minor fall. He has sudden palpitations without chest pain or syncope. He is alert, well perfused, and has normal mental status. A 12-lead ECG shows a regular narrow-complex tachycardia without clearly visible P waves. Vagal maneuvers do not terminate the rhythm. What is the most appropriate next treatment?
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