A patient who has Wolff-Parkinson-White syndrome is given intravenous adenosine (Adenocard). The nurse will explain that the medication is effective because it
a. controls atrial flutter.
b. deepens myocardial excitability.
c. prevents multifocal ventricular contractions.
d. prolongs repolarization.
ANS: D
Adenosine is a class III drug that prolongs repolarization by increasing the refractory period and prolonging the action potential to slow heart rate. It does not control atrial flutter, deepen myocardial excitability, or prevent multifocal contractions.
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