Antiarrhythmics

Question 1

what class of antiarrhythmics are fast Na+ channel blockers?

Answer 1

class I

Question 2

what are the class IV antiarrhythmics called? what are the most commonly used?

Answer 2

CCBs

• Verapamil
• Diltiazem

Question 3

what drug is considered both a class II & class III antiarrhythmic?

Answer 3

Sotalol

Question 4

which class of antiarrhythmics slows conduction the most? what is their effect on action potential duration?

Answer 4

Class IC

• Flecainide
• Propafenone

little effect on APD (mild)

Question 5

which class of antidysrhythmics has little effect on conduction velocity & shortens APD?

Answer 5

Lidocaine
mexiletine
phenytoin (few patients, if any)

Question 6

what class of antidysrhythmics is no longer used anymore & why?

Answer 6

Class IA d/t too many side effects

• Quinidine
• Disopyramide
• Procainamide