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 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.
Correct Answer is C
Explanation
Choice A rationale
Headaches and blurred vision are not specific to stage I Lyme disease. These symptoms can occur in many other conditions and are not the primary indicators of early Lyme disease.
Choice B rationale
Tremors and weakness are not typical early signs of Lyme disease. These symptoms are more associated with neurological involvement, which occurs in later stages of the disease.
Choice C rationale
Rash symptoms, specifically erythema migrans (a bull’s-eye rash), are the hallmark of stage I Lyme disease. This rash appears at the site of the tick bite and is a key diagnostic feature.
Choice D rationale
Painful joints are more commonly seen in later stages of Lyme disease when the infection has spread and caused more systemic involvement.