Intermediate Lung Sounds
Stridor

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phonocardiogram

torso with stethoscope chestpiece
chestpiece
maneuver
Maneuver:Sitting
Position:Chest wall
Chestpiece:Diaphragm

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.