The nurse working on a cardiac care unit is caring for a patient whose stroke volume has increased. The nurse is aware that afterload influences a patient's stroke volume. The nurse recognizes that afterload is increased when there is what?
A) Arterial vasoconstriction
B) Venous vasoconstriction
C) Arterial vasodilation
D) Venous vasodilation
Ans: A
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Arterial vasoconstriction increases the systemic vascular resistance, which increases the afterload. Venous vasoconstriction decreases preload thereby decreasing stroke volume. Venous vasodilation increases preload.
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