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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. A patient presents in pulseless arrest. ECG shows chaotic, irregular undulations of varying amplitude with no identifiable P waves or QRS complexes. What is the rhythm?

    Answer: Ventricular fibrillation

    Ventricular fibrillation presents as chaotic, irregular electrical activity with no discernible P waves, QRS complexes, or T waves, requiring immediate defibrillation.

  2. Which QTc value is considered prolonged and places a patient at risk for torsades de pointes?

    Answer: Greater than 500 ms

    A QTc greater than 500 ms is considered critically prolonged and significantly increases the risk of torsades de pointes and sudden cardiac death.

  3. A conscious patient's ECG shows a regular narrow-complex tachycardia at 160 bpm with no visible P waves. What is the most appropriate initial intervention?

    Answer: Adenosine 6 mg rapid IV push

    Stable SVT without visible P waves is treated with vagal maneuvers first, then adenosine 6 mg rapid IV push as the pharmacologic first-line agent per ACLS guidelines.

  4. ST elevation in leads V1-V4 with new right bundle branch block and hypotension in a STEMI patient should raise concern for which complication?

    Answer: Right ventricular MI

    Anterior STEMI with new RBBB and hypotension can indicate right ventricular involvement, and right-sided leads (V4R) should be obtained to confirm RV MI.

  5. In a patient with suspected digoxin toxicity, which ECG pattern is classically described as the 'Salvador Dali' or 'scooping' sign?

    Answer: Downsloping ST depression resembling a sagging baseline

    Digoxin effect produces a characteristic 'scooped' or downsloping ST depression pattern ('Salvador Dali mustache' or 'reverse tick') most visible in lateral leads.

  6. A patient's 12-lead ECG shows a normal sinus rhythm with ST elevation in aVR and diffuse ST depression in most other leads. What condition should you consider?

    Answer: Left main or proximal LAD occlusion

    ST elevation in aVR with diffuse ST depression across multiple leads is a pattern strongly associated with left main coronary artery or proximal LAD occlusion, indicating high-risk ischemia.

  7. A 12-lead ECG reveals right axis deviation, tall R wave in V1, and deep S waves in V6. Which condition is most consistent with these findings?

    Answer: Right ventricular hypertrophy

    Right ventricular hypertrophy (RVH) classically presents with right axis deviation, dominant R wave in V1, and deep S waves in left precordial leads (V5-V6).