skip to main content

Supraventricular Tachycardia — UKMLA MCQ

Instant feedback + full explanation. One question, done properly.

HardCardiologySupraventricular TachycardiaUKMLAMRCP Part 1PSA

Adenosine transiently slows a regular narrow-complex tachycardia and reveals continuous flutter waves, but tachycardia persists. What rhythm interpretation is most likely?

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

Reveal the answer and explanation

Correct answer: E — Atrial flutter with fixed atrioventricular conduction

The best answer is “Atrial flutter with fixed atrioventricular conduction”. Adenosine briefly blocks the AV node and can uncover ongoing atrial activity even when it does not terminate an atrial tachyarrhythmia. Continuous flutter waves revealed during transient AV block support atrial flutter; AV-node-dependent re-entry would usually terminate rather than persist with exposed atrial activity.

Reference: Resuscitation Council UK: Adult tachyarrhythmia algorithm: https://www.resus.org.uk/sites/default/files/2021-04/Tachycardia%20Algorithm%202021.pdf