CRAT Antiarrhythmic Medications and Clinical Interventions 3

Question 1

The Vaughan Williams Class IV antiarrhythmics include:

Accepted Answer

Calcium channel blockers

Answer

Class IV antiarrhythmics are calcium channel blockers (e.g., diltiazem, verapamil) that slow conduction through the AV node.

Question 2

Which intervention is the definitive treatment for ventricular fibrillation?

Accepted Answer

Unsynchronized defibrillation (CPR + shock)

Answer

Unsynchronized defibrillation combined with CPR is the only definitive treatment for ventricular fibrillation, as per ACLS protocols.

Question 3

A CRAT notices a patient in sustained stable monomorphic VT. After confirming the patient is stable, the next appropriate intervention is:

Accepted Answer

Synchronized cardioversion or antiarrhythmic therapy per protocol

Answer

Stable monomorphic VT is treated with synchronized cardioversion or antiarrhythmics (e.g., amiodarone or procainamide) per ACLS protocol.

Question 4

Procainamide's primary antiarrhythmic mechanism is:

Accepted Answer

Blocking fast sodium channels to slow conduction

Answer

Procainamide is a Class IA sodium channel blocker that slows intraventricular conduction and prolongs the refractory period.

Question 5

Which electrolyte imbalance is most likely to cause refractory ventricular arrhythmias resistant to standard treatment?

Accepted Answer

Hypomagnesemia

Answer

Hypomagnesemia is a common cause of refractory ventricular arrhythmias, and IV magnesium replacement is essential before antiarrhythmic therapy can be effective.

CRAT - Certified Rhythm Analysis Technician Practice Test

CRAT - Certified Rhythm Analysis Technician Practice Test

CRAT Antiarrhythmic Medications and Clinical Interventions 3