Heart and Lung Sounds Reference Guide Aortic Pulmonic Erb's Point Tricuspid Mitral Lungs Stridor Auscultation Reference Signup Now. Unlock lessons and more. SignUp Patient Normal Speed play pause Patient Half Speed play pause Lesson For heart sounds listen to the synthetic sound while reviewing this lesson. 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. The waveform(s) seen above are a chart of sound amplitude (loudness) on the vertical axis against time on the horizontal axis. Listening Tips A summary of the key aspects of this heart or lung sound. A loud, high-pitched wheezing sound heard during inspiration but may also occur throughout the respiratory cycle. Often heard without a stethoscope. Auscultation Method The recommended patient position is sitting For this sound, use stethoscope's diaphragm The recommended auscultation position for the stethoscope is posterior-3l Relevant Courses If you wish to review a complete mobile concerning Stridor Auscultation Reference and related heart sounds, the modules(s) listed below may be useful. Each lesson includes text that explains the auscultatory sound and its clinical significance. The lesson also includes an audio track for playback. A waveform provides a great way to visualize the sounds. Finally, we also include an animation video. For heart sounds, the video illustrates heart muscle and valve movements along with blood flow. For lung sounds, the primary source of the sounds can be seen. Each module also includes a quiz. Intermediate Lung Sounds202 Introduction to Lung Sounds 203 Stridor Auscultation Reference