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Question:
It is determined that the best course of therapy for a 65-year-old male with repeated bouts of atrial fibrillation is rate control therapy. Administration of which of the following is most appropriate?
Correct Answer: D. Metoprolol
Rate control therapy generally increases the PR interval. Beta blockers (metoprolol), cardiac glycosides (digoxin), and Class IV ARs (diltiazem, verapamil) all result in PR lengthening.
Lidocaine and mexiletine are Class Ib AR, which function by decreasing the action potential (AP) duration, but not by affecting the AV node (and thus the PR interval). Nesiritide is recombinant BNP used for decompensated congestive heart failure. Adenosine results in temporary AV block, but isn’t useful here.
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1. Question
Category: PharmacologyIt is determined that the best course of therapy for a 65-year-old male with repeated bouts of atrial fibrillation is rate control therapy. Administration of which of the following is most appropriate?
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