Stridor

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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.

Stridor
The recommended auscultation position for the stethoscope is the Chest wall position. For this sound, use stethoscope's Diaphragm.


maneuver
The recommended patient position is Sitting

Waveform

waveform
This waveform plots sound amplitude on the vertical axis against time on the horizontal axis.
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Listening Tips
A synopsis of important sound features and timing for this abnormality.
A loud, high-pitched wheezing sound heard during inspiration but may also occur throughout the respiratory cycle. Often heard without a stethoscope.
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