KVV E-Modules

Which class of antiarrhythmic drugs primarily blocks fast sodium channels during Phase 0 of the cardiac action potential?

A: Class II B: Class III C: Class I D: Class IV

Which subclass of Class I drugs prolongs the action potential duration and the QT interval?

A: Class IB B: Class IC C: Class IA D: Class II

Which of the following antiarrhythmic drugs is also known for its local anesthetic properties and is used for digitalis-induced arrhythmias?

A: Quinidine B: Verapamil C: Lidocaine D: Digoxin

What is the primary mechanism of β-blockers (Class II) in treating arrhythmias?

A: Blocking calcium influx into smooth muscle B: Enhancing vagal tone C: Prolonging QT interval D: Blocking β-adrenergic receptors and slowing AV conduction

Which class of antiarrhythmic drugs prolongs repolarization by blocking potassium channels?

A: Class I B: Class II C: Class III D: Class IV

What is a serious adverse effect associated with Amiodarone?

A: Tinnitus B: Pulmonary fibrosis C: Gingival hyperplasia D: Hypokalemia

Which antiarrhythmic drug acts by increasing vagal tone and is especially useful in AFib with heart failure?

A: Adenosine B: Verapamil C: Digoxin D: Lidocaine

Which class of antiarrhythmic drugs is most suitable for treating AV nodal reentry tachycardia (e.g., PSVT)?

A: Class I B: Class II C: Adenosine D: Class III

Verapamil belongs to which class of antiarrhythmic drugs and is contraindicated in which condition?

A: Class I; Asthma B: Class IV; Congestive Heart Failure C: Class II- Hypertension D: Class III; Atrial fibrillation

Which of the following drugs is a Class IC agent that significantly slows conduction in all parts of the heart?

A: Lidocaine B: Flecainide C: Sotalol D: Quinidine