A patient is admitted to the emergency department in ventricular fibrillation. The patient is administered amiodarone hydrochloride (Cordarone). What is a major effect of this medication?
A) It produces skeletal muscle relaxation.
B) It decreases automaticity in the ventricles.
C) It stimulates the sympathetic nervous system.
D) It slows the process of repolarization.
D
Feedback:
Potassium channel blockers such as amiodarone prolong duration of the action potential, slow repolarization, and prolong the refractory period in both the atria and ventricles. Amiodarone blocks the effects of the sympathetic nervous system instead of stimulating it. Amiodarone and the other potassium channel blockers do not directly decrease automaticity.
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