CRAT Antiarrhythmic Medications and Clinical Interventions 1

Question 1

Which antiarrhythmic drug is classified as a Class III agent and is commonly used for atrial fibrillation and ventricular tachycardia?

Accepted Answer

Amiodarone

Answer

Amiodarone is a Class III antiarrhythmic that blocks potassium channels to prolong repolarization and is widely used for both atrial and ventricular arrhythmias.

Question 2

Adenosine is the drug of choice for terminating which arrhythmia?

Accepted Answer

Paroxysmal supraventricular tachycardia (PSVT)

Answer

Adenosine transiently blocks AV node conduction and is the first-line drug for terminating PSVT by interrupting re-entry circuits involving the AV node.

Question 3

Which medication should be avoided in patients with Wolff-Parkinson-White (WPW) syndrome presenting with atrial fibrillation?

Accepted Answer

AV nodal blocking agents (e.g., adenosine, verapamil)

Answer

AV nodal blocking agents are contraindicated in WPW with AF because they can enhance conduction through the accessory pathway, potentially causing ventricular fibrillation.

Question 4

Magnesium sulfate is the treatment of choice for:

Accepted Answer

Torsades de Pointes

Answer

IV magnesium sulfate is the first-line treatment for Torsades de Pointes because it stabilizes the cardiac membrane and shortens the QT interval.

Question 5

Atropine is administered in cardiac emergencies primarily to treat:

Accepted Answer

Symptomatic bradycardia

Answer

Atropine blocks vagal (parasympathetic) tone to increase heart rate and is the first-line drug for symptomatic bradycardia per ACLS guidelines.

CRAT - Certified Rhythm Analysis Technician Practice Test

CRAT - Certified Rhythm Analysis Technician Practice Test

CRAT Antiarrhythmic Medications and Clinical Interventions 1