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Electrocardiography Technician Fundamentals Flashcards

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

Read the first 6 Electrocardiography Technician Fundamentals flashcards as text

  1. The P wave on an ECG represents:

    Answer: Atrial depolarization

    The P wave reflects the electrical depolarization of the atria, initiating atrial contraction.

  2. A normal PR interval duration on an adult ECG is:

    Answer: 0.12–0.20 seconds

    A normal PR interval is 0.12–0.20 seconds, representing conduction from the SA node through the AV node.

  3. The QRS complex on an ECG represents:

    Answer: Ventricular depolarization

    The QRS complex represents the electrical depolarization of the ventricles, triggering ventricular contraction.

  4. In a standard 12-lead ECG, how many chest (precordial) leads are there?

    Answer: 6

    A 12-lead ECG includes 6 precordial (chest) leads: V1 through V6.

  5. Which of the following is the primary pacemaker of the heart?

    Answer: SA node

    The sinoatrial (SA) node, located in the right atrium, is the heart's primary pacemaker, normally firing at 60–100 bpm.

  6. Artifact on an ECG tracing is most commonly caused by:

    Answer: Patient movement or muscle tremor

    Patient movement or muscle tremor (somatic tremor artifact) is the most common source of ECG artifact.

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