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Obstructive lesions of the upper airway create turbulent airflow, which follows the laws of fluid dynamics. Rapidly flowing air moving across a narrowed segment of the respiratory tract creates vibrations that produce distinctive sounds, which are diagnostically useful to the clinician. The location of the obstruction in the airway will affect the phase, tone, and timing of the sound. The clinician can use this information to create a differential diagnosis. Stertor describes the low-pitched inspiratory snoring sound typically produced by nasal or nasopharyngeal obstruction. Stridor typically originates from the larynx, upper trachea, or hypopharynx. Wheezing is the expiratory sound...

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