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EKG Basics Flashcards

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

Read the first 7 EKG Basics flashcards as text

  1. Which EKG finding is most characteristic of hyperkalemia?

    Answer: Peaked T waves

    Hyperkalemia classically produces tall, peaked (tent-shaped) T waves on EKG.

  2. On a standard EKG, the PR interval is measured from the beginning of the P wave to the beginning of which wave?

    Answer: Q wave

    The PR interval spans from the onset of the P wave to the onset of the QRS complex (Q wave).

  3. A patient's EKG shows no visible P waves and an irregularly irregular rhythm. Which arrhythmia does this most likely represent?

    Answer: Atrial fibrillation

    Atrial fibrillation produces absent distinct P waves and an irregularly irregular ventricular response.

  4. The QT interval represents which phase of the cardiac cycle?

    Answer: Total ventricular depolarization and repolarization

    The QT interval encompasses the entire period of ventricular electrical activity — both depolarization and repolarization.

  5. Which lead configuration views the inferior wall of the heart?

    Answer: Leads II, III, and aVF

    The inferior leads — II, III, and aVF — reflect electrical activity from the bottom surface of the heart.

  6. An EKG strip shows a PR interval of 0.28 seconds. This finding is consistent with:

    Answer: First-degree AV block

    A PR interval greater than 0.20 seconds (one large box) that is constant indicates first-degree AV block.

  7. Which waveform on an EKG represents ventricular repolarization?

    Answer: T wave

    The T wave reflects ventricular repolarization as the ventricles reset electrically after contraction.

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