What is the purpose of administering diphenhydramine before a blood transfusion?
To expand the blood volume.
To enhance clotting factors.
To avoid fever and chills.
To prevent urticaria.
The Correct Answer is D
Choice A rationale
Diphenhydramine does not expand blood volume. It is an antihistamine used to prevent allergic reactions.
Choice B rationale
Diphenhydramine does not enhance clotting factors. It is used to manage allergic reactions.
Choice C rationale
While diphenhydramine can help manage fever and chills, its primary purpose before a blood transfusion is to prevent allergic reactions.
Choice D rationale
Administering diphenhydramine before a blood transfusion helps prevent urticaria and other allergic reactions by blocking histamine release. .
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Correct Answer is A
Explanation
Choice A rationale
Cataracts cause the lens of the eye to become cloudy, leading to a decreased ability to perceive colors. This is due to the scattering of light as it passes through the cloudy lens, which reduces the clarity and vibrancy of colors.
Choice B rationale
Loss of peripheral vision is more commonly associated with glaucoma, a condition where increased intraocular pressure damages the optic nerve.
Choice C rationale
Seeing bright flashes of light and floaters is typically a symptom of retinal detachment, a serious condition where the retina pulls away from its normal position.
Choice D rationale
Loss of central vision is often linked to macular degeneration, a condition that affects the central part of the retina responsible for sharp, detailed vision.
Correct Answer is A
Explanation
Choice A rationale
A CD4-T-cell count of 180 cells/mm³ indicates severe immunosuppression in a client with HIV, making them highly susceptible to opportunistic infections. This is a critical value that requires immediate attention to prevent life-threatening complications.
Choice B rationale
A positive Western blot test confirms the presence of HIV antibodies but does not indicate the current immune status or the urgency of the client’s condition.
Choice C rationale
Platelets at 150,000/mm³ are within the normal range and do not indicate an immediate threat to the client’s health.
Choice D rationale
A WBC count of 5,000/mm³ is within the normal range and does not indicate an immediate threat to the client’s health.