What finding indicates that a mild airway obstruction has become a severe obstruction?

NREMT distinguishes mild versus severe airway obstruction primarily by the patient’s ability to move air. In a mild obstruction, the patient can cough forcefully, speak, and exchange air. A severe obstruction occurs when airflow is critically impaired.

Option A (Ineffective cough) is the key indicator that a mild obstruction has progressed to a severe one. An ineffective or silent cough means the patient can no longer generate enough airflow to clear the obstruction, placing them at imminent risk of hypoxia and cardiac arrest.

Option B is a late sign of hypoxia but does not define severity of obstruction.

Option C is not specific to airway obstruction severity.

Option D indicates a mild obstruction, not severe.

NREMT teaches that once a cough becomes ineffective, immediate airway intervention is required.