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ECG Rhythm Interpretation Flashcards

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

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  1. Which ECG pattern is associated with Brugada syndrome?

    Answer: Coved ST elevation in V1–V2 with RBBB morphology

    Brugada syndrome shows a characteristic coved-type ST elevation (≥2 mm) with RBBB morphology in leads V1–V2, linked to risk of sudden cardiac death.

  2. What is the corrected QT interval (QTc) formula using Bazett's correction?

    Answer: QT divided by the square root of the RR interval (in seconds)

    Bazett's formula corrects the QT interval for heart rate: QTc = QT / √RR, where RR is measured in seconds.

  3. A patient's rhythm strip shows grouped beating with progressively lengthening PR intervals until a P wave fails to conduct. What is the rhythm?

    Answer: Second-degree AV block, Mobitz type I (Wenckebach)

    Wenckebach (Mobitz I) is defined by progressive PR prolongation followed by a non-conducted P wave, then the cycle repeats.

  4. In left bundle branch block (LBBB), which leads typically show broad monophasic R waves?

    Answer: I, aVL, V5, V6

    LBBB produces broad, notched, or slurred monophasic R waves in the lateral leads (I, aVL, V5, V6) due to delayed left ventricular depolarization.

  5. A post-cardiac surgery patient's ECG shows alternating electrical axis with every other beat. What is this finding called?

    Answer: Electrical alternans

    Electrical alternans is the beat-to-beat alternation in QRS amplitude or axis, classically associated with pericardial effusion and cardiac tamponade.

  6. Which supraventricular tachycardia produces a 'pseudo-R prime' in V1 and 'pseudo-S' in inferior leads during tachycardia?

    Answer: AV nodal reentrant tachycardia (AVNRT)

    Typical AVNRT has retrograde P waves buried in or just after the QRS, producing pseudo-R' in V1 and pseudo-S in II, III, aVF.

  7. What is the most reliable criterion to diagnose ventricular tachycardia vs. SVT with aberrancy using the Brugada algorithm?

    Answer: Absence of RS complex in all precordial leads

    The first step of the Brugada algorithm is to check for the absence of any RS complex in all precordial leads; if present, VT is diagnosed immediately.