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

Arrhythmia Recognition & Classification 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 Arrhythmia Recognition & Classification flashcards as text

  1. Which of the following best describes the R-on-T phenomenon and its clinical significance?

    Answer: A PVC occurring on the vulnerable T wave, potentially triggering VF

    R-on-T occurs when a PVC falls on the relative refractory period (T wave), which can trigger ventricular fibrillation due to dispersion of repolarization.

  2. A patient's ECG shows a regular narrow-complex tachycardia at 170 bpm. After carotid sinus massage, the rate abruptly drops to 75 bpm. This response is most consistent with:

    Answer: AV nodal reentrant tachycardia (AVNRT)

    AVNRT depends on the AV node for its reentrant circuit; vagal maneuvers that slow AV conduction will abruptly terminate the tachycardia rather than gradually slow it.

  3. In atrial flutter, the flutter waves (F waves) are best visualized in which leads?

    Answer: II, III, aVF, and V1

    The inferior leads (II, III, aVF) and V1 provide the best view of the negative sawtooth flutter waves because the atrial reentrant circuit is oriented inferiorly.

  4. A patient with a narrow-complex tachycardia at 160 bpm has retrograde P waves visible AFTER the QRS complex in the ST segment. This pattern suggests:

    Answer: Orthodromic AVRT (atrioventricular reentrant tachycardia)

    In orthodromic AVRT, conduction goes antegrade through the AV node and retrograde via an accessory pathway, placing retrograde P waves well after the QRS in the ST segment (long RP interval).

  5. Which of the following ECG patterns is associated with right ventricular outflow tract (RVOT) tachycardia?

    Answer: LBBB morphology with inferior axis (positive QRS in II, III, aVF)

    RVOT tachycardia originates in the right ventricular outflow tract and characteristically shows LBBB pattern with an inferior axis, as ventricular activation spreads left and inferiorly.

  6. Wandering atrial pacemaker (WAP) is distinguished from MAT primarily by:

    Answer: Heart rate — WAP is <100 bpm, MAT is ≥100 bpm

    Both WAP and MAT require at least 3 P-wave morphologies, but WAP has a ventricular rate below 100 bpm while MAT by definition is ≥100 bpm.

  7. An ECG showing a P-wave axis of +150° (inverted in leads I and aVF, upright in aVR) with a short PR interval most likely indicates:

    Answer: Ectopic atrial rhythm originating from the low right atrium or coronary sinus

    A P-wave axis of approximately +150° suggests atrial activation spreading superiorly and rightward, consistent with a low atrial or coronary sinus pacemaker rather than the sinus node.