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ECG Interpretation Flashcards

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

Read the first 6 ECG Interpretation flashcards as text

  1. What does the P wave on an ECG represent?

    Answer: Atrial depolarization

    The P wave represents the electrical depolarization spreading through the atria, triggering atrial contraction.

  2. A normal PR interval ranges from:

    Answer: 0.12 to 0.20 seconds

    The normal PR interval is 0.12-0.20 seconds (3-5 small boxes), representing the time from atrial depolarization to ventricular depolarization.

  3. ST segment elevation most commonly indicates:

    Answer: Acute myocardial injury

    ST elevation is a hallmark finding of acute myocardial infarction (heart attack), indicating acute injury to the heart muscle.

  4. What does the QRS complex represent?

    Answer: Ventricular depolarization

    The QRS complex represents the rapid depolarization of both ventricles, triggering ventricular contraction and ejection of blood.

  5. What is the standard paper speed for ECG recording?

    Answer: 25 mm/sec

    Standard ECG paper speed is 25 mm/second, where each small box represents 0.04 seconds and each large box represents 0.20 seconds.

  6. Lead II records electrical activity between which electrodes?

    Answer: Right arm and left leg

    Lead II measures the potential difference between the right arm (negative) and left leg (positive), roughly aligned with the heart's electrical axis.

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Sources & references

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  1. nhanow.com — Test delivery, score release, score validity, eligibility, passing score, renewal, retake policy · verified Oct 2026
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