What is stridor?

• A. A low-pitched sound heard during exhalation.
• B. A normal airway sound.
• C. A high pitched sound generated from obstruction in the upper airway.
• D. A high-pitched sound generated from obstruction in the upper airway.

Answer: (D)

Stridor happens when the upper airway (larynx or trachea) is narrowed, creating turbulent airflow that produces a high‑pitched, harsh sound. It’s typically seen with upper airway obstruction and is often most noticeable on inspiration, though it can be present in other phases if the obstruction is significant. This distinguishes it from sounds produced by the lower airways, like wheezes, which are usually musical and more often related to bronchospasm and are not the same high-pitched sound from the upper airway.

So the best description is a high-pitched sound generated by obstruction in the upper airway. In the field, recognize stridor as an emergency sign of possible airway compromise, and prioritize airway and breathing: provide high‑flow oxygen, monitor closely, keep the patient calm and upright as appropriate, and arrange rapid transport for definitive care. Be prepared for potential airway deterioration and follow your protocols for advanced airway management if needed.