Paradoxical vocal cord motion: an important cause of stridor.

Paradoxical vocal cord motion (PVCM) is an important cause of laryngeal stridor and dysphonia; however, only two previous cases have been reported. We report three additional cases, one of which was tracheotomized on two occasions before the diagnosis was made. These patients, typically young females who have had a recent upper respiratory infection, present with stridor. They can phonate weakly, but they cannot cough. Indirect laryngoscopy reveals smooth, symmetric vocal cord adduction on inspiration and abduction on expiration. Laboratory values are normal. PVCM appears to be self-limited (up to 72 hours), and patients respond to supportive care and sedation. Tracheotomy appears to be unnecessary. The etiology is obscure and may be functional; however, a case is discussed in which PVCM was seen in association with chronic aspiration in a patient with organic brain syndrome. An awareness of this entity and a high index of suspicion can prevent unnecessary tracheotomy.