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The biphasic spirogram: a clue to unilateral narrowing of a mainstem bronchus.
  1. A D Gascoigne,
  2. P A Corris,
  3. J H Dark,
  4. G J Gibson
  1. Department of Respiratory Medicine, Freeman Hospital, Newcastle upon Tyne.


    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.

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