Which term refers to an inspiratory high-pitched sound due to obstruction in the pharynx or larynx?

• A. Stridor
• B. Hypothermia
• C. Crackles
• D. Tachycardia

Answer: (A)

An inspiratory high-pitched sound indicates an upper airway narrowing, called stridor. It happens when air moves through a constricted pharynx or larynx, causing turbulent flow and vibration of surrounding tissues as you breathe in. This makes stridor a clear sign of partial airway obstruction at or above the level of the vocal cords, often requiring prompt assessment.

Hypothermia is simply low body temperature, not a sound. Crackles are crackling lung sounds from fluid or secretions in the small airways or alveoli, usually heard with inspiration but not caused by upper airway narrowing. Tachycardia is a rapid heart rate. Stridor’s association with upper airway obstruction explains why it’s the best answer, especially in contexts like croup, epiglottitis, or suspected foreign body obstruction.