A patient presents with atrial fibrillation,a heart rate of 156 beats/min,and a blood pressure of 124/76 mm Hg.The physician orders diltiazem,a calcium channel blocker,to be given slowly by intravenous push.Why did the physician choose this medication to treat this patient's atrial tachyarrhythmia?
A) Diltiazem decreases the calcium influx into the AV nodal tissue and decreases the speed of impulse conduction.
B) Diltiazem increases the calcium influx into the AV nodal tissue and decreases the speed of impulse conduction.
C) Diltiazem decreases the calcium influx into the myocardial tissue and decreases the strength of heart contraction.
D) Diltiazem increases the calcium influx into the myocardial tissue and decreases the strength of heart contraction.
Correct Answer:
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