Functional laryngeal obstruction relieved by panting.

A 49-year-old man presented with a two-day history of severe recurrent dyspnea and inspiratory stridor. A chest roentgenogram, computed tomographic scan of the neck, direct laryngoscopy, and bronchoscopy excluded organic upper airway obstruction. Laryngospasm occurred during the bronchoscopy. Although flow volume loops revealed severe upper airway obstruction (inspiratory and expiratory), airway resistance measured plethysmographically (during panting) was normal. Because of this observation, panting was recommended for relief of the patient's recurrent attacks of functional laryngeal obstruction. The panting maneuver immediately and completely relieved all 25 to 30 subsequent attacks. After the patient recovered clinically, a flow volume loop was repeated and was found to be normal. The marked discrepancy between severe flow limitation (as detected by flow volume loops) and normal airway resistance (measured plethysmographically) may be a diagnostic test for functional laryngeal obstruction, and panting may be an effective emergency measure for its relief. Relief by panting may also suggest the diagnosis. A second patient with an almost identical symptom complex is described, in whom the panting maneuver was also dramatically successful in promptly aborting recurrent severe attacks of airway obstruction and stridor.