A nurse is assisting in the care of a client who is receiving a dopamine infusion at a low dose for treatment of shock. Which of the following findings is an expected effect of this medication?
Lowered heart rate
Decreased conduction through the AV node
Increased urine output
Vasoconstriction of renal blood vessels
The Correct Answer is C
A) Lowered heart rate:
Dopamine typically increases heart rate as it acts on beta-adrenergic receptors in the heart, leading to increased cardiac contractility and chronotropy. However, at low doses, the effect on heart rate may be minimal compared to higher doses.
B) Decreased conduction through the AV node:
Dopamine may have minimal effects on conduction through the atrioventricular (AV) node, especially at low doses. It primarily acts on adrenergic receptors to increase cardiac contractility and heart rate.
C) Increased urine output.
Dopamine is a medication commonly used to treat shock by improving cardiac output and blood pressure. At low doses, dopamine primarily acts on dopamine receptors in the renal blood vessels, causing vasodilation and increased renal blood flow. This increased renal blood flow leads to increased glomerular filtration rate (GFR) and urine output. Therefore, increased urine output is an expected effect of dopamine infusion at low doses in the treatment of shock.
D) Vasoconstriction of renal blood vessels:
At low doses, dopamine primarily acts on dopamine receptors in the renal blood vessels, causing vasodilation and increased renal blood flow. Vasoconstriction of renal blood vessels is more commonly associated with higher doses of dopamine or with other vasopressor medications such as norepinephrine or phenylephrine.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
A) Low-back pain:
Low-back pain is not a common manifestation of an allergic reaction to a blood transfusion. It may be associated with other conditions, such as musculoskeletal issues or renal complications, but it is not typically addressed by diphenhydramine administration during transfusion.
B) Fever:
While fever can occur as a manifestation of an adverse reaction to a blood transfusion, it is more commonly associated with non-allergic transfusion reactions such as transfusion-related acute lung injury (TRALI) or bacterial contamination of the blood product. Diphenhydramine is not specifically indicated for the prevention of fever during transfusion.
C) Dyspnea:
Dyspnea, or difficulty breathing, can occur as a manifestation of a severe allergic reaction or anaphylaxis during a blood transfusion. However, diphenhydramine alone may not be sufficient to prevent or treat severe respiratory symptoms associated with anaphylaxis. In such cases, prompt medical intervention and administration of epinephrine may be necessary. Diphenhydramine primarily targets histamine-mediated symptoms such as urticaria and itching.
D) Urticaria.
Urticaria, commonly known as hives, is a skin reaction characterized by raised, itchy welts that can occur as a result of an allergic or hypersensitivity reaction. During a blood transfusion, if the recipient's immune system reacts to foreign proteins in the transfused blood, it can lead to an allergic reaction characterized by symptoms such as urticaria, itching, flushing, and sometimes more severe reactions like anaphylaxis.
Diphenhydramine is an antihistamine medication that works by blocking the effects of histamine, a chemical released by the body during allergic reactions. By administering diphenhydramine before the blood transfusion, the nurse aims to prevent or minimize the occurrence of urticaria and other allergic symptoms.
Correct Answer is ["5"]
Explanation
To determine how many hours it will take for the IV pump to infuse the 1000 mL bag of 0.9% sodium chloride at a rate of 200 mL/hr, we can use the following formula:
Time (hr) = Volume (mL)/Rate (mL/hr)
Given:
Volume = 1000 mL
Rate = 200 mL/hr
Substitute the given values into the formula:
Time (hr)=1000 mL/200 mL/hr
Time (hr)=5hours
Rounding to the nearest whole number, the IV pump will infuse over 5 hours.
Therefore, the nurse should expect the IV pump to infuse over 5 hours.
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