Abstract
PURPOSE: The diagnosis of paradoxical vocal cord dysfunction is suggested by the patient's clinical history. It is definitively made by observing the vocal cords via flexible laryngoscopy/bronchoscopy. Paradoxical vocl cord dysfunction can also be suggested by a flat inspiratory limb of the spirometry flow-volume loop. An increase in airway resistance via impulse oscillometry may also suggest paradoxical vocal cord dysfunction. The purpose of this study was to evaluate the usefulness of spirometry and impulse oscillometry in the diagnosis of pardoxical vocal cord dysfunction.
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