NAPLEX (North American Pharmacist Licensure Examination) Practice Exam

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Which medication is used for refractory VT/cardiac arrest?

Lidocaine
Flecainide
Dronedarone
Propafenone

The correct answer is: Lidocaine

Lidocaine is the correct answer for the medication used for refractory ventricular tachycardia (VT) or cardiac arrest. Lidocaine is a class IB antiarrhythmic drug that is commonly used in emergency situations such as cardiac arrest or when other antiarrhythmic medications have failed to control VT. It works by stabilizing the cardiac cell membranes, which helps in reducing the electrical excitability of the heart. Although Flecainide, Dronedarone, and Propafenone are also antiarrhythmic drugs, they are not typically used for refractory VT or cardiac arrest. Flecainide and Propafenone are more commonly used for maintenance of sinus rhythm in atrial fibrillation, while Dronedarone is used for rhythm control in atrial fibrillation.