title: The biphasic spirogram: a clue to unilateral narrowing of a mainstem bronchus.
abstract: Two patients with narrowing of a mainstem bronchus each showed two unusual functional features that are likely to be characteristic of this condition. The maximum inspiratory flow-volume curve showed an end inspiratory "tail" and the forced expiratory spirogram had a biphasic shape with normal initial curvature but a "straight line" appearance in later expiration. In one patient relief of the bronchial stenosis by the insertion of a stent restored normal contours to the spirogram and flow-volume curves.
authors.affiliation: Department of Respiratory Medicine, Freeman Hospital, Newcastle upon Tyne.
authors.forename: A D
authors.initials: AD
authors.lastname: Gascoigne
authors.forename: P A
authors.initials: PA
authors.lastname: Corris
authors.forename: J H
authors.initials: JH
authors.lastname: Dark
authors.forename: G J
authors.initials: GJ
authors.lastname: Gibson
mesh_terms: D001980:Bronchi / Q000473:pathology* / Q000503:physiopathology; D001982:Bronchial Diseases / Q000473:pathology* / Q000503:physiopathology; D002000:Bronchospirometry; D005260:Female; D005541:Forced Expiratory Volume; D006801:Humans; D008297:Male; D008449:Maximal Expiratory Flow-Volume Curves; D008875:Middle Aged