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Electrocardiography Procedures & Interpretation Flashcards

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

Read the first 7 Electrocardiography Procedures & Interpretation flashcards as text

  1. Which ECG pattern is associated with hyperkalemia?

    Answer: Tall peaked T waves progressing to widened QRS

    Hyperkalemia first produces tall, narrow, peaked T waves; as potassium rises further, the PR prolongs, QRS widens, and ultimately a sine-wave pattern may develop.

  2. On a standard ECG tracing run at 25 mm/sec, how long does each large box (5 mm) represent in time?

    Answer: 0.20 seconds

    At the standard paper speed of 25 mm/sec, each large box (5 mm wide) represents 0.20 seconds (200 ms).

  3. A patient's ECG shows P waves that change morphology beat to beat with a rate of 105 bpm. What is this rhythm?

    Answer: Multifocal atrial tachycardia

    Multifocal atrial tachycardia (MAT) features at least three distinct P-wave morphologies, irregular rhythm, and a rate >100 bpm, often seen in COPD patients.

  4. Which ECG lead is most commonly used as the monitoring lead in continuous cardiac monitoring?

    Answer: Lead II

    Lead II is the standard monitoring lead because it provides the best view of P waves and QRS complexes for rhythm assessment.

  5. ST depression in leads V1–V4 during an acute coronary event should raise concern for which condition?

    Answer: Posterior MI (reciprocal changes)

    ST depression in V1–V4 can represent reciprocal changes of a true posterior MI, which would show ST elevation in posterior leads V7–V9.

  6. What is the normal axis range for QRS complex in an adult ECG?

    Answer: -30° to +90°

    The normal QRS axis in adults ranges from -30° to +90°, reflecting the predominant leftward and inferior direction of ventricular depolarization.

  7. A CCT notices the ECG shows a regularly irregular rhythm where the PR interval progressively lengthens until a QRS is dropped. What is this rhythm?

    Answer: Mobitz I (Wenckebach) second-degree AV block

    Mobitz I (Wenckebach) is characterized by progressive PR prolongation until a P wave fails to conduct and the QRS is dropped, then the cycle repeats.