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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. On an ECG, what characteristic finding confirms ventricular fibrillation (VF)?

    Answer: Chaotic, disorganized electrical activity with no identifiable QRS complexes

    VF appears as chaotic, irregular waveforms with no identifiable P waves, QRS complexes, or T waves.

  2. Which ECG rhythm is characterized by a regularly irregular pattern with no P waves and a sawtooth baseline at ~300 bpm?

    Answer: Atrial flutter

    Atrial flutter produces characteristic sawtooth flutter waves at ~300 bpm, most visible in leads II, III, aVF, and V1.

  3. In ACLS, pulseless electrical activity (PEA) is best described as:

    Answer: An organized ECG rhythm without a palpable pulse

    PEA is defined as organized electrical activity on the monitor with absent pulse, requiring CPR and investigation of reversible causes.

  4. What is the hallmark ECG finding of first-degree AV block?

    Answer: PR interval > 200 ms with every P wave followed by a QRS

    First-degree AV block shows a consistently prolonged PR interval (>200 ms) with every P wave followed by a QRS complex.

  5. Which type of second-degree AV block is considered more dangerous and often requires pacing?

    Answer: Mobitz Type II

    Mobitz Type II block features a fixed PR interval with sudden dropped beats and can progress to complete heart block without warning.

  6. What ECG finding is the hallmark of Wolff-Parkinson-White (WPW) syndrome?

    Answer: Delta wave with short PR interval

    WPW is identified by a delta wave (slurred QRS upstroke), short PR interval (<120 ms), and widened QRS due to pre-excitation.