A nurse is administering a vasodilator that dilates resistance vessels. The nurse understands that this drug will have which effect on the patient?
a. Decreased cardiac preload
b. Decreased cardiac output
c. Increased tissue perfusion
d. Increased ventricular contraction
ANS: C
Vasodilators that dilate resistance vessels, or arterioles, cause a decrease in afterload, which allows cardiac output and tissue perfusion to increase. A decrease in preload would be the result of dilation of capacitance vessels, or veins. Dilation of arterioles increases cardiac output. Ventricular contraction results when preload is increased.
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