The high-pitched sound caused by an upper airway obstruction is known as:

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Stridor is a high-pitched sound that occurs when there is an upper airway obstruction, often caused by swelling or constriction of the airway. Gurgling sounds may also be heard in the presence of an airway obstruction, but they are often accompanied by the sound of fluid or secretions in the airway. Rhonchi and rales are both sounds that can be heard in the lower airways and are caused by fluid or secretions in the lungs.

The High-Pitched Sound Caused by an Upper Airway Obstruction Is