A nurse is caring for a patient who is receiving a drug that causes constriction of arterioles. The nurse expects to observe which effect from this drug?
a. Decreased stroke volume
b. Increased stroke volume
c. Decreased myocardial contractility
d. Increased myocardial contractility
ANS: A
Constriction of arterioles increases the load against which the heart must pump to eject blood. Increased constriction of arterioles would decrease, not increase, the stroke volume of the heart. Myocardial contractility is determined by the sympathetic nervous system, acting through beta1-adrenergic receptors in the myocardium.
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