Skip to Main Content

Chapter 10: Antiarrhythmic Drugs

The arrhythmic mechanism of action for re-entry is due to which of the following?

a. Unidirectional blockade of anterograde electrical conduction in the heart

b. Bidirectional blockade of anterograde electrical conduction in the heart

c. Increased excitability of ectopic pacemaker activity

d. Decreased excitability of ectopic pacemaker activity

Which of the following electrolyte disturbances would increase the pharmacologic effect of class 3 antiarrhythmic drugs?

a. Hyponatremia

b. Hypocalcemia

c. Hypokalemia

d. Hypomagnesemia

Which of the following electrolyte disturbances would increase the pharmacologic effect of class 4 antiarrhythmic drugs?

a. Hypokalemia

b. Hyponatremia

c. Hyperkalemia

d. Hypocalcemia

Which of the following antiarrhythmic drugs has negative chronotropic, inotropic, and dromotropic effects?

a. Dofetilide

b. Adenosine

c. Propranolol

d. Lidocaine

Which of the following antiarrhythmic drugs has negative chronotropic, inotropic, and dromotropic effects?

a. Lidocaine

b. Verapamil

c. Dofetilide

d. Adenosine

Which of the following drugs inhibits both sodium channels and potassium channels?

a. Procainamide

b. Flecainide

c. Propranolol

d. Verapamil

Which of the following drug classes only increases QRS duration on the ECG?

a. Class 1B

b. Class 1C

c. Class 2

d. Class 4

Which of the following drugs is most associated with thyroid dysfunction?

a. Amiodarone

b. Dofetilide

c. Quinidine

d. Verapamil

...

Pop-up div Successfully Displayed

This div only appears when the trigger link is hovered over. Otherwise it is hidden from view.