The class I antidysrhythmic drugs block sodium channels. However, the nurse needs to realize that class I drugs have different actions. Which category of class I antidysrhythmic drugs accelerates repolarization?

a. Class IA
b. Class IB
c. Class IC
d. Class IA and IB


ANS: B
Only class IB drugs increase repolarization.
Class IA drugs delay repolarization.
Class IC drugs prolong prodysrhythmic actions.
Class IA drugs delay repolarization; class IB drugs increase repolarization.

Nursing

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