Stridor in an adult. An unusual presentation of functional origin.

A 34-year-old woman with a recent history of a influenza-like illness and signs of bronchopneumonia presented with many of the features of acute epiglottitis, a condition which still carries a high mortality in adults. Urgent laryngoscopy and bronchoscopy under inhalational anaesthesia were negative. The results of arterial blood gases, taken when stridor was at its worst, revealed marked hypocapnia and respiratory alkalosis. We conclude that the resultant acute reduction of serum ionised calcium produced stridor as a result of tetany of the vocal cords. Similar cases from the literature and the role of emotional factors in the aetiology are discussed.