Which symptom is indicative of anaphylaxis?

High-pitched wheezing on inhalation is a key symptom of anaphylaxis, which is a severe and potentially life-threatening allergic reaction. This symptom occurs due to bronchoconstriction, where the airways become narrowed in response to an allergen, making it difficult for air to pass through. The wheezing sound results from the airflow struggling to move through these constricted airways. Along with wheezing, anaphylaxis may also present with other symptoms such as difficulty breathing, swelling of the throat, hives, and a rapid drop in blood pressure, all of which signal the urgency of the situation.

Other options like incontinence, blue lips, and a rash on the torso can be associated with various medical conditions but are not specific indicators of anaphylaxis. For instance, while blue lips may suggest poor oxygenation, it is not a direct or primary symptom associated with anaphylaxis compared to wheezing. Understanding these symptoms is essential for dental nurses, as they need to be prepared to recognize and respond to anaphylactic reactions in their practice.