What does the term stridor refer to in the context of respiratory sounds?

• A. An audible sound during normal breathing
• B. A noise indicating congestion in the lungs
• C. An audible sound resulting from turbulent airflow through a narrowed airway
• D. A silent period during inspiration

Answer: (C)

Stridor refers specifically to an audible sound that occurs when there is turbulent airflow through a narrowed airway. This condition can be caused by various factors, including obstructions or swelling in the upper respiratory tract, such as from infections, allergies, or foreign objects. The sound is often high-pitched and can indicate that the airway is compromised, potentially requiring medical attention.

The other options describe different respiratory sounds or states but do not accurately define stridor. For instance, the first choice describes normal breathing, which would not involve stridor, while the second choice suggests congestion in the lungs, which is not specifically related to the high-pitched sound characteristic of stridor. The last option mentions a silent period during inspiration, which does not capture the essence of the audible nature of stridor. Thus, the correct understanding of stridor focuses on the turbulence created by narrowed airways, making it a crucial indicator of potential respiratory distress.