Which of the following is a sign of airway occlusion in a patient experiencing anaphylaxis?

Tightness in the throat is a significant sign of airway occlusion in a patient experiencing anaphylaxis. This symptom generally indicates that the airway is becoming constricted due to swelling of the tissues, which can occur during a severe allergic reaction. Anaphylaxis causes the release of histamines and other chemicals in the body that lead to vasodilation and increased permeability of blood vessels, resulting in swelling (edema) that can obstruct airflow.

When tightness in the throat is observed, it suggests that the airway may be compromised, which is a critical and life-threatening situation requiring immediate medical intervention. Recognizing this symptom is vital, as it helps in prompting assessors and responders to take swift action, such as administering epinephrine or performing other emergency procedures to secure the patient's airway.

In contrast, while the other options may occur during anaphylaxis, they are not as direct indicators of airway occlusion. Persistent coughing may occur as the body attempts to clear secretions, excessive salivation may be due to autonomic nervous system responses, and a rapid heart rate could be a response to stress or shock rather than a direct sign of airway blockage.