What is the rationale behind administering calcium channel blockers to patients with angina?
a. They decrease heart rate.
b. They dilate blood vessels.
c. They increase cardiac contractility.
d. They promote fluid excretion.
ANS: B
By inhibiting smooth muscle contraction, the calcium channel blockers dilate blood vessels and decrease resistance to blood flow. Dilation of peripheral vessels reduces the workload of the heart. Calcium channel blockers are not given to decrease heart rate in patients with angina. Calcium channel blockers do not increase cardiac contractility or promote fluid excretion.
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