A patient is admitted to the cardiac care unit from the emergency department. He is receiving amiodarone (Cordarone), because his frequent runs of ventricular tachycardia have proved refractory to other drugs
The rationale for using this very toxic, potentially ventricular antidysrhythmic drug is that it
a. delays action potential.
b. delays repolarization.
c. opens calcium and sodium channels.
d. vasoconstricts peripheral vessels.
ANS: B
Amiodarone delays repolarization.
Amiodarone increases action potential.
Amiodarone blocks calcium and sodium channels.
Amiodarone promotes peripheral vessel vasodilation.
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