In the ICU, a monitor shows ventricular fibrillation or pulseless ventricular tachycardia. After CPR and defibrillation, which antiarrhythmic medication is preferred?

1. A

   Digoxin or adenosine

2. B

   Amiodarone or lidocaine

3. C

   Metoprolol or diltiazem

4. D

   Atropine or dopamine

Appeared in: PGIMER Nursing Officer - 2025

Explanation

• Amiodarone is the preferred antiarrhythmic for shock-refractory VF or pulseless VT after CPR and defibrillation.
• Lidocaine is an alternative if amiodarone is unavailable or ineffective.
• Both drugs are administered intravenously during advanced cardiac life support (ACLS) protocols.
• These medications help stabilize the cardiac rhythm and increase the chance of return of spontaneous circulation (ROSC).
• Key differentiator: Only amiodarone and lidocaine are recommended for this specific scenario; other options are not indicated for shockable rhythms post-defibrillation.

Why Other Options Were Wrong

• Option A: Digoxin and adenosine are not used for ventricular fibrillation or pulseless VT. Digoxin is for chronic heart failure or atrial fibrillation; adenosine is for supraventricular tachycardia (SVT).
• Option C: Metoprolol and diltiazem are rate-controlling agents for atrial arrhythmias, not for ventricular fibrillation or pulseless VT. They are not used in cardiac arrest with shockable rhythms.
• Option D: Atropine and dopamine are used for bradyarrhythmias and hypotension, not for VF or pulseless VT. Atropine is for symptomatic bradycardia; dopamine is a vasopressor for shock states.

Related Visual

Clinical Relevance

• Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Preferred antiarrhythmic medication after CPR and defibrillation for ventricular fibrillation or pulseless ventricular tachycardia as background academic context rather than a clinical decision trigger.
• Nurses must recognize the correct medication sequence in cardiac arrest to improve survival.
• Timely administration of amiodarone or lidocaine can increase the chance of ROSC in shock-refractory VF/VT.
• What if? If the rhythm is asystole or pulseless electrical activity (PEA), amiodarone/lidocaine are not used; epinephrine and addressing reversible causes are prioritized.

How to Approach the Question

• Identify the cardiac rhythm (VF or pulseless VT) and the clinical scenario (post-CPR, post-defibrillation).
• Recall the ACLS algorithm for shockable rhythms.
• Eliminate options that are not antiarrhythmics or not indicated for ventricular arrhythmias.
• Select the medication(s) specifically recommended for shock-refractory VF/VT.
• Confirm with standard protocols and guidelines.

Concept Tested & Keywords

• Concept Tested: Preferred antiarrhythmic medication after CPR and defibrillation for ventricular fibrillation or pulseless ventricular tachycardia
• Stem keywords: ICU, ventricular fibrillation, pulseless ventricular tachycardia, CPR, defibrillation, antiarrhythmic medication
• Lead-in keywords: preferred
• Clinical cues: Shockable rhythm (VF/pulseless VT) after CPR and defibrillation

Question ID

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Copy ID

Reference Book

E6 Medicine Harrison 22e Part 2 p. 240-242

E6 Nelson Textbook of Pediatrics(2024) — Volume 2 p. 642-644