Sudden Pounding Chest Pain in Pediatrics — 12yo Child | Pediatric Cardiology | SMLE Q#17276
SMLE Question #17276
Pediatrics
Pediatric Cardiology
Objective: OBJ-283
Last updated: February 2026
A 12-year-old boy presents with sudden pounding chest pain and palpitations that started 30 minutes ago while playing soccer. He feels anxious and lightheaded and denies syncope or chest trauma. Examination shows a very rapid, regular rhythm without murmurs; lungs are clear. A 12-lead ECG shows a regular narrow-complex tachycardia at 255/min with no visible P waves. What is the most likely diagnosis?
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