A nurse is collecting data from a client following the administration of a new medication. Which of the following findings should the nurse identify as a manifestation of an allergic reaction?

Choice A rationale Hypertension, an elevated blood pressure, is not typically a direct manifestation of an allergic reaction. Allergic reactions, particularly anaphylaxis, are more commonly associated with widespread vasodilation and increased capillary permeability, leading to hypotension due to fluid shifting out of the intravascular space into the interstitial space, reducing circulating blood volume. Choice B rationale Jaundice, characterized by yellowing of the skin and sclera, results from hyperbilirubinemia due to impaired liver function or increased red blood cell destruction. It is not a direct or common manifestation of an acute allergic reaction, which primarily involves histamine release and inflammatory mediators. Choice C rationale Bradycardia, a slow heart rate (typically less than 60 beats per minute), is generally not a primary sign of an allergic reaction. Tachycardia often occurs due to compensatory mechanisms in response to vasodilation and hypotension in severe allergic responses to maintain cardiac output. Choice D rationale Urticaria, also known as hives, presents as raised, erythematous, pruritic wheals on the skin. This is a classic manifestation of an allergic reaction mediated by histamine release from mast cells and basophils, causing localized vasodilation and increased vascular permeability in the superficial dermis.