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Supraventricular tachycardia — ABEM Board MCQ

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EasyCardiovascular emergenciesSupraventricular tachycardiaABEM Board

A 24-year-old woman arrives with sudden palpitations that started while exercising. Triage acuity is ESI 3; BP 118/74 mm Hg, HR 184/min, SpO2 99%. ECG shows a regular narrow-complex tachycardia without visible P waves. She is alert and has no chest pain. Which of the following is the most appropriate next step in management?

Educational content. Not a substitute for clinical judgement or local policy.

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Correct answer: D — Perform a modified Valsalva maneuver

Stable regular narrow-complex SVT is initially managed with vagal maneuvers, followed by adenosine if needed.

Reference: AHA ACLS 2025 tachycardia algorithm