Reversible expiratory airway obstruction
The
curve delimited by the interrupted line represents the predicted flow-volume curve. The
convexity of the curve towards the volume axis before bronchodilatation
points to peripheral airway obstruction. There is significant bronchodilator
responsiveness, with normalization of the FVC, signifying very significant
reversibility of expiratory airway obstruction. The illustration
also shows the inspiratory and expiratory flow-volume curve during
normal tidal breathing.