A patient is taking a beta1-adrenergic drug to improve the stroke volume of the heart. The
nurse caring for this patient knows that this drug acts by increasing:
a. cardiac afterload.
b. cardiac preload.
c. myocardial contractility.
d. venous return.
ANS: C
Beta1-adrenergic agents help inc...
a patient is taking a beta1 adrenergic drug to improve the stroke volume of the heart thenurse caring for this patient knows that this drug acts by increasing
1. A patient is taking a beta1-adrenergic drug to improve the stroke volume of the heart. The
nurse caring for this patient knows that this drug acts by increasing:
a. cardiac afterload.
b. cardiac preload.
c. myocardial contractility.
d. venous return.
ANS: C
Beta1-adrenergic agents help increase the heart’s stroke volume by increasing myocardial
contractility. Cardiac afterload is determined primarily by the degree of peripheral resistance
caused by constriction of arterioles; increasing afterload would decrease stroke volume. Beta1-
adrenergic agents do not affect afterload. Cardiac preload is the amount of stretch applied to
the cardiac muscle before contraction and is determined by the amount of venous return.
Beta1-adrenergic agents do not affect cardiac preload. Venous return is determined by the
systemic filling pressure and auxiliary muscle pumps and is not affected by beta1-adrenergic
agents.
2. 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.
3. A patient with a history of hypertension is admitted for a procedure. If the patient’s arterial
pressure decreases, which clinical manifestation would the nurse expect to see?
a. Decreased heart rate
b. Increased heart rate
c. Decreased blood pressure
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