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 D
Explanation
Choice A rationale
Sound lateralizing to the right ear during the Rinne test does not indicate conductive hearing loss in the left ear. This result suggests that the right ear may have better hearing or that there is an issue with the left ear, but it does not specifically diagnose conductive hearing loss.
Choice B rationale
Sound lateralizing to the left ear during the Rinne test indicates that the left ear is perceiving the sound better, which could be due to conductive hearing loss in the left ear. However, this option does not provide a definitive result for conductive hearing loss.
Choice C rationale
Air conduction being greater than bone conduction in the left ear is a normal finding and does not indicate conductive hearing loss. In conductive hearing loss, bone conduction is typically better than air conduction.
Choice D rationale
Air conduction being less than bone conduction in the left ear is indicative of conductive hearing loss. This result means that the sound is being conducted through the bones of the skull more effectively than through the air, which is a hallmark of conductive hearing loss.
Correct Answer is C
Explanation
Choice A rationale
Erythema and edema of the affected ear are more commonly associated with external otitis (swimmer’s ear) rather than otitis media. Otitis media involves the middle ear, not the external ear canal.
Choice B rationale
Pain when manipulating the affected ear lobe is also indicative of external otitis. In otitis media, the pain is usually deeper and not affected by manipulation of the ear lobe.
Choice C rationale
Tugging on the affected ear lobe is a common sign in toddlers with otitis media. This behavior is due to the discomfort and pressure in the middle ear caused by the infection.
Choice D rationale
Clear drainage from the affected ear is not typical of otitis media. If there is drainage, it is usually purulent (pus-like) and indicates a ruptured eardrum.