Practice Test Geeks(CET) Certified Electrocardiogram Technician Practice Test
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12-Lead ECG Interpretation Flashcards

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  1. Which leads form the precordial (chest) leads on a standard 12-lead ECG?

    Answer: V1 through V6

    The precordial leads are V1 through V6, placed across the chest to view the heart in the horizontal plane.

  2. In a 12-lead ECG, what does a left axis deviation (LAD) most commonly indicate?

    Answer: Left anterior fascicular block

    Left anterior fascicular block is the most common cause of left axis deviation, shifting the QRS axis to between -30° and -90°.

  3. ST elevation in leads V1–V4 is most consistent with which type of STEMI?

    Answer: Anterior STEMI

    Leads V1–V4 overlie the anterior wall of the left ventricle, so ST elevation there indicates an anterior STEMI.

  4. A patient's ECG shows a QRS axis of +120°. This is classified as:

    Answer: Right axis deviation

    A QRS axis beyond +90° (up to +180°) is classified as right axis deviation.

  5. Which of the following patterns on a 12-lead ECG is associated with Wolff-Parkinson-White syndrome?

    Answer: Short PR interval, delta wave, and wide QRS

    WPW is characterized by a short PR interval (<120 ms), a slurred delta wave at the onset of the QRS, and a widened QRS complex.

  6. Which lead is the primary lead for identifying atrial activity and P-wave morphology?

    Answer: Lead II

    Lead II is oriented along the heart's electrical axis and provides the clearest upright P waves for evaluating atrial activity.

  7. In right bundle branch block (RBBB), what is the classic finding in lead V1?

    Answer: RSR' pattern (rabbit ears)

    RBBB produces an RSR' or 'M-shaped' (rabbit ears) pattern in V1 due to delayed right ventricular depolarization.