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ECG Rhythm Interpretation Flashcards

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

Read the first 7 ECG Rhythm Interpretation flashcards as text

  1. In Mobitz Type II second-degree AV block, which ECG finding differentiates it from Mobitz Type I?

    Answer: Constant PR interval with sudden non-conducted P wave

    Mobitz Type II features a constant PR interval followed by a sudden dropped QRS, whereas Mobitz Type I has progressive PR lengthening (Wenckebach).

  2. A patient's ECG shows P waves and QRS complexes occurring independently with no relationship to each other. The ventricular rate is 38 bpm with wide QRS complexes. What is the rhythm?

    Answer: Complete (third-degree) AV block

    Complete (third-degree) AV block is characterized by complete AV dissociation where the atria and ventricles beat independently, and a wide QRS with slow rate indicates a ventricular escape pacemaker.

  3. Which of the following best describes torsades de pointes on ECG?

    Answer: Polymorphic VT where QRS axis twists around the isoelectric line

    Torsades de pointes is a polymorphic ventricular tachycardia in which the QRS amplitude and axis appear to rotate or twist around the baseline.

  4. A 45-year-old presents with palpitations. ECG shows a short PR interval of 0.10 seconds, a slurred upstroke on the QRS (delta wave), and a wide QRS. What syndrome does this suggest?

    Answer: Wolff-Parkinson-White syndrome

    WPW syndrome is characterized by a short PR interval, delta wave (slurred QRS upstroke), and widened QRS due to pre-excitation via an accessory pathway.

  5. On an ECG, which lead configuration is best for identifying P wave morphology and diagnosing atrial rhythms?

    Answer: Lead II

    Lead II is most commonly used to evaluate P wave morphology because it is oriented along the main atrial vector, producing the tallest and most upright P waves.

  6. A patient's rhythm strip shows a P wave before every QRS, but the PR interval progressively lengthens until a QRS is dropped, then the cycle repeats. What is this rhythm?

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

    Wenckebach (Mobitz Type I) is characterized by progressive PR prolongation until a P wave fails to conduct, then the PR interval resets and the pattern repeats.

  7. ST segment depression in leads V1-V4 during a posterior MI is a reciprocal change. What would direct posterior leads (V7-V9) show?

    Answer: ST elevation and upright T waves

    True posterior MI produces ST elevation and upright T waves in posterior leads (V7-V9), which appear as mirror-image ST depression in V1-V4.