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ECG Rhythm Interpretation Flashcards

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

Read the first 7 ECG Rhythm Interpretation flashcards as text

  1. A patient presents with an irregular rhythm, no discernible P waves, and an irregularly irregular ventricular rate of 110 bpm. What is the most likely rhythm?

    Answer: Atrial fibrillation

    Atrial fibrillation is characterized by an irregularly irregular ventricular response and absent distinct P waves, replaced by fibrillatory baseline.

  2. On an ECG, you observe a regular rhythm at 150 bpm with sawtooth flutter waves most visible in leads II, III, and aVF. What is the atrial rate most commonly associated with this rhythm?

    Answer: 300-350 bpm

    Atrial flutter typically has an atrial rate of 300-350 bpm, commonly presenting with 2:1 conduction yielding a ventricular rate near 150 bpm.

  3. A patient's ECG shows a QRS complex of 0.14 seconds with a right bundle branch block morphology and a rate of 180 bpm with no visible P waves. What rhythm should you suspect?

    Answer: Ventricular tachycardia

    A wide-complex tachycardia at 180 bpm without visible P waves is ventricular tachycardia until proven otherwise, even if RBBB morphology is present.

  4. Which ECG finding is most characteristic of hyperkalemia?

    Answer: Peaked, narrow, symmetric T waves

    Hyperkalemia classically produces tall, peaked, narrow, and symmetric T waves, especially prominent in precordial leads.

  5. A patient in cardiac arrest has ECG showing organized electrical activity but no palpable pulse. Which rhythm is present?

    Answer: Pulseless electrical activity

    Pulseless electrical activity (PEA) is defined as organized cardiac electrical activity on ECG without a palpable pulse.

  6. On a 12-lead ECG, ST elevation in leads II, III, and aVF with reciprocal depression in leads I and aVL suggests occlusion of which artery?

    Answer: Right coronary artery

    Inferior STEMI (ST elevation in II, III, aVF) with reciprocal lateral changes is most commonly caused by right coronary artery occlusion.

  7. What is the PR interval range that defines first-degree AV block in adults?

    Answer: Greater than 0.20 seconds

    First-degree AV block is defined as a PR interval consistently greater than 0.20 seconds (200 ms) with all P waves conducted.