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ACLS Cardiac Rhythm Recognition 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 Rhythm Recognition flashcards as text

  1. In third-degree (complete) heart block, what is the relationship between P waves and QRS complexes?

    Answer: P waves and QRS complexes are completely dissociated with no consistent relationship

    In complete heart block, the atria and ventricles beat independently with no relationship between P waves and QRS complexes — the PR interval varies randomly.

  2. Which ECG finding is most consistent with hyperkalemia in a symptomatic patient?

    Answer: Tall peaked T waves and widened QRS complexes

    Hyperkalemia classically produces tall, peaked T waves followed by widening of the QRS and, if untreated, can progress to a sine-wave pattern and cardiac arrest.

  3. A patient presents with a regular narrow-complex tachycardia at 150 bpm. Vagal maneuvers fail. Which drug is given first?

    Answer: Adenosine 6 mg IV rapid push

    Adenosine 6 mg given as a rapid IV push is the first-line drug for stable narrow-complex SVT after failed vagal maneuvers.

  4. On the ECG, a PR interval greater than 200 ms that is constant with all P waves conducted defines:

    Answer: First-degree AV block

    First-degree AV block is defined by a PR interval >200 ms (one large box) that is constant, with every P wave followed by a QRS complex.

  5. Which of the following best describes Mobitz Type II second-degree AV block?

    Answer: Constant PR interval with sudden dropped QRS complexes without warning

    Mobitz Type II shows a constant PR interval with intermittent, unpredictable failure of conduction — a QRS complex simply drops without progressive PR lengthening.

  6. What ECG pattern is classically associated with right ventricular MI and should prompt right-sided lead placement?

    Answer: ST elevation in leads II, III, aVF — especially with ST elevation in V1

    ST elevation in the inferior leads with ST elevation in V1 (or V4R on right-sided leads) suggests right ventricular MI, which complicates inferior STEMI.