Stridor is caused by upper airway narrowing or obstruction. It is often heard without a stethoscope. It occurs in 10-20% of extubated patients.

Stridor is a loud, high-pitched crowing breath sound heard during inspiration but may also occur throughout the respiratory cycle most notably as a patient worsens.

In children, stridor may become louder in the supine position.

Causes of stridor are pertussis, croup, epiglottis, aspirations.

After reviewing the sound, use the waveform and anatomy tabs for more information about this sound.


Stridor
maneuver
Position: Chest wall
Maneuver: Sitting
Chestpiece: Diaphragm