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ACLS Cardiac Rhythms & ECG Interpretation Flashcards

6 cards from real ACLS practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 6 ACLS Cardiac Rhythms & ECG Interpretation flashcards as text

  1. Which of the following rhythms is SHOCKABLE in the ACLS pulseless arrest algorithm?

    Answer: Ventricular fibrillation (VF)

    Ventricular fibrillation and pulseless ventricular tachycardia are the only two shockable rhythms in the ACLS cardiac arrest algorithm.

  2. What QTc duration is generally considered prolonged and at risk for torsades de pointes?

    Answer: >500 ms

    A QTc >500 ms significantly increases the risk for torsades de pointes (TdP) and sudden cardiac death.

  3. Accelerated idioventricular rhythm (AIVR) following myocardial infarction typically has what rate?

    Answer: 40–100 bpm

    AIVR has a rate of 40–100 bpm and is often a benign reperfusion arrhythmia requiring no treatment.

  4. Which lead is most useful for identifying P waves and distinguishing atrial arrhythmias in ACLS monitoring?

    Answer: Lead II or V1

    Lead II provides the best visualization of P waves due to its alignment with the atrial vector, while V1 clearly shows flutter waves and retrograde P waves.

  5. A patient presents with a regular wide-complex tachycardia at 200 bpm. Which ECG finding would MOST support a diagnosis of ventricular tachycardia over SVT with aberrancy?

    Answer: AV dissociation (P waves marching through independently)

    AV dissociation — independent P waves unrelated to QRS complexes — is the most reliable ECG criterion distinguishing VT from SVT with aberrancy.

  6. What does the presence of ST elevation in leads II, III, and aVF suggest in the context of ACLS?

    Answer: Inferior STEMI

    ST elevation in leads II, III, and aVF indicates inferior wall STEMI, typically caused by right coronary artery occlusion.