A strained, high-pitched sound on inspiration caused by obstruction in the pharynx or larynx is known as?

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

Answer: (C)

When there is an obstruction in the upper airway, the inspiratory phase can produce a strained, high-pitched sound known as stridor. This sound results from turbulent airflow as air is pulled through a narrowed pharynx or larynx, often due to swelling, a foreign body, or other blockage. Stridor is typically heard without a stethoscope and may become more pronounced with agitation or crying. It signals that the airway above the vocal cords is narrowed and requires prompt assessment to determine and treat the underlying cause, since this can be a medical emergency.

In contrast, eupnea refers to normal, unlabored breathing. Tachycardia means a rapid heart rate, which is a cardiovascular sign, and hypothermia refers to an abnormally low body temperature. None of these describe an audible inspiratory airway sound.