A 32-year-old man who was stung by a bee has diffuse hives and difficulty breathing. What does audible stridor indicate?

Audible stridor is a high-pitched sound that occurs during breathing, particularly during inspiration, and is a significant clinical indicator of upper airway obstruction or narrowing. In the scenario provided, the 32-year-old man is experiencing diffuse hives and difficulty breathing following a bee sting, which suggests an allergic reaction that could lead to swelling in the upper airway.

When the upper airway structures, such as the larynx or trachea, swell, it can lead to stridor as the airflow is restricted. This is particularly concerning in the context of anaphylaxis—a severe allergic reaction that can cause significant swelling in these areas. Stridor serves as a critical sign for healthcare providers to consider immediate intervention to secure the airway and address the underlying cause of the swelling.

Other options discussed involve areas of the lower airway, such as the mainstem bronchi or bronchioles. However, audible stridor specifically points to issues in the upper airway rather than these lower structures. This distinction is crucial in managing respiratory distress effectively, as interventions vary significantly based on the location and cause of the obstruction.