198) ANSWER
D) Calcium channel blocker
RATIONALE
Verapamil and diltiazem, of all the calcium channel blockers, have the greatest effect on the AV node to slow the heart rate. Additional drug effects are slowing of the ventricular rate in atrial fibrillation or flutter, and conversion of supraventricular tachycardia (SVT) to a normal sinus rhythm (NSR). Knowing that one of the actions of calcium channel blockers slows the heart rate will assist in selecting option 4. If this was difficult, review the effects of each listed classification.
D) Calcium channel blocker
RATIONALE
Verapamil and diltiazem, of all the calcium channel blockers, have the greatest effect on the AV node to slow the heart rate. Additional drug effects are slowing of the ventricular rate in atrial fibrillation or flutter, and conversion of supraventricular tachycardia (SVT) to a normal sinus rhythm (NSR). Knowing that one of the actions of calcium channel blockers slows the heart rate will assist in selecting option 4. If this was difficult, review the effects of each listed classification.
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