Which set of vital signs would MOST likely be present during the earlier stages of an acute anaphylactic reaction?

During the earlier stages of an acute anaphylactic reaction, the body goes through significant physiological changes as it responds to the allergen. The correct choice reflects a state of increased heart rate, decreased blood pressure, and potentially increased respiratory rate, which are indicative of anaphylaxis.

In anaphylaxis, the release of histamines and other mediators causes vasodilation and increased capillary permeability, leading to hypotension and potentially worsening respiratory distress. The elevated heart rate (tachycardia) occurs as the body tries to compensate for the drop in blood pressure and maintain adequate blood flow to vital organs. The respiratory rate may also increase (tachypnea) as the body attempts to improve oxygenation due to possible bronchoconstriction and swelling of the airway.

The specific values of HR 128, B/P 86/58, and RR 32 represent a classic manifestation of anaphylaxis: a rapid heart rate combined with low blood pressure and a high respiratory rate, which align with the physiological response to anaphylactic shock. This choice effectively captures the early stage of the reaction, where the body is still trying to compensate for the adverse effects of the allergen exposure.