ECG Cardiac Pharmacology 2

Question 1

Which antiarrhythmic drug class works by blocking sodium channels and slowing phase 0 depolarization?

Accepted Answer

Class I

Answer

Class II

Answer

Class III

Answer

Class IV

Question 2

A patient receives IV adenosine for SVT. Which ECG change would you expect immediately after administration?

Accepted Answer

Transient AV block

Answer

Prolonged QT interval

Answer

ST elevation

Answer

Wide QRS complex

Question 3

Digoxin toxicity on an ECG most commonly presents as which rhythm?

Accepted Answer

PVCs with bigeminy

Answer

Atrial flutter

Answer

Right bundle branch block

Answer

Sinus tachycardia

Question 4

Which drug used to treat atrial fibrillation primarily works by blocking IKr potassium channels to prolong the action potential?

Accepted Answer

Dofetilide

Answer

Metoprolol

Answer

Flecainide

Answer

Verapamil

Question 5

A patient on amiodarone should be monitored for which ECG manifestation as a sign of toxicity?

Accepted Answer

Markedly prolonged QT interval

Answer

Shortened PR interval

Answer

Left axis deviation

Answer

Delta waves

Question 6

Which calcium channel blocker is preferred for rate control in atrial fibrillation because it primarily acts on the AV node?

Accepted Answer

Diltiazem

Answer

Amlodipine

Answer

Nifedipine

Answer

Nicardipine

Question 7

Lidocaine is classified as which Vaughan Williams antiarrhythmic class?

Accepted Answer

Class IB

Answer

Class IA

Answer

Class IC

Answer

Class II