NCIt definition : Paroxysmal spasmodic muscular contraction of the vocal cords. It is brief, usually
lasting for less than one minute, interrupting the speech and breathing and may produce
a high-pitched breathing sound. It may occur under anesthesia or may be associated
with gastroesophageal reflex disease.;
Alternative definition : CTCAE: A disorder characterized by paroxysmal spasmodic muscular contraction of the
vocal cords.; NICHD: The involuntary adduction of the vocal cords resulting in airway obstruction
on inspiration.;