NCIt definition : A symptom resulting from laryngeal obstruction. It is characterized by a high pitched
breathing sound.;
Alternative definition : NICHD: A high-pitched breath sound secondary to obstruction and turbulent air flow
at the level of the larynx.; CTCAE: A disorder characterized by a high pitched breathing sound due to laryngeal
or upper airway obstruction.; ACC/AHA: A clinical finding in which there is loud or harsh inspiratory noise associated
with obstruction of the upper airway.;