Practice Test Geeks(CET) Certified Electrocardiogram Technician Practice Test
← All CET Flashcard Decks

12-Lead ECG Interpretation Flashcards

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

Read the first 7 12-Lead ECG Interpretation flashcards as text

  1. In left bundle branch block (LBBB), which lead shows a broad, notched, monophasic R wave?

    Answer: V5 or V6

    LBBB produces a broad, notched (M-shaped) or slurred R wave in the lateral leads V5, V6, I, and aVL due to abnormal septal and left ventricular depolarization.

  2. Sagging ST depression with a prominent U wave is most characteristic of:

    Answer: Hypokalemia

    Hypokalemia classically causes ST depression, flattened T waves, and prominent U waves (sometimes taller than the T wave).

  3. Which Sgarbossa criterion carries the highest specificity for STEMI in the presence of LBBB?

    Answer: Concordant ST depression ≥1 mm in leads V1–V3

    Concordant ST depression ≥1 mm in V1–V3 has the highest specificity (~94%) for STEMI in LBBB among the Sgarbossa criteria.

  4. A 12-lead ECG reveals a regular rhythm at 150 bpm with sawtooth flutter waves best seen in leads II, III, and aVF. This is:

    Answer: Atrial flutter

    Classic atrial flutter produces sawtooth-pattern flutter waves at ~300 bpm with 2:1 AV block resulting in a ventricular rate of ~150 bpm.

  5. Pathological Q waves in leads V1–V4 indicate a prior:

    Answer: Anterior myocardial infarction

    Q waves ≥40 ms wide or ≥25% of R-wave depth in V1–V4 reflect loss of anterior myocardial tissue from a prior anterior MI.

  6. Osborn (J) waves on a 12-lead ECG are pathognomonic for which condition?

    Answer: Hypothermia

    Osborn waves are positive deflections at the J point, most prominent in lateral leads, and are a hallmark of hypothermia (core temperature below 32°C).

  7. In a 12-lead ECG, right axis deviation with an S1Q3T3 pattern suggests:

    Answer: Pulmonary embolism

    The S1Q3T3 pattern (S wave in I, Q wave and inverted T wave in III) with right axis deviation is a classic but nonspecific ECG finding in pulmonary embolism.