Platinum Paramedic Practice Test

During resuscitation for pulseless VT/VF, the priority after the second defibrillation is to add an antiarrhythmic to stop the ongoing chaotic electrical activity and improve the chance of return of spontaneous circulation. Amiodarone is the preferred choice because it has broad antiarrhythmic effects, blocking multiple channels and prolonging refractoriness, which helps terminate persistent VT/VF and stabilizes the rhythm during ongoing CPR. This makes it more effective in this situation than other options. If amiodarone isn’t available, lidocaine is a backup antiarrhythmic, but it’s not the first choice. Magnesium is reserved for torsades de pointes or low magnesium states, and epinephrine is used to improve perfusion during CPR but does not directly terminate refractory VT/VF.