Which of the following is NOT a sign of anaphylaxis?

Anaphylaxis is a severe, life-threatening allergic reaction that involves multiple body systems, leading to a range of symptoms. Typical signs of anaphylaxis include respiratory distress (dyspnea), gastrointestinal symptoms (vomiting, salivation), and cardiovascular changes (such as hypotension, not high blood pressure).

High blood pressure is not a sign of anaphylaxis; in fact, the cardiovascular response in anaphylaxis usually includes vasodilation and potential shock, which can lead to low blood pressure. This response can result in inadequate blood flow to vital organs. In contrast, symptoms such as vomiting, salivation, and dyspnea are directly related to the body's systemic reaction to allergens, making high blood pressure an outlier in this context. Therefore, it is accurate to identify high blood pressure as not being associated with the signs of anaphylaxis.