Abstract
Background and Method. Analysis of the flow-volume curve can define the nature of airway stenosis. Stenting at the flow-limiting segment (the choke point: CP) is assessed. We determined the precise location of the CP using the flow-volume curve, pre and post-stenting in patients with extrinsic compression due to lung cancer. Results. We demonstrated distinct serial flow-volume curve patterns specific to the type of stenosis. In tracheal stenosis, marked reduction of expiratory flow with a plateau indicated fixed stenosis. In bronchial stenosis, expiratory flow with choking indicated dynamic stenosis. In extensive stenosis, severe reduction of expiratory flow indicated complex stenosis. After placement of a Dumon Y-stent at the CP, additional Ultraflex stents at migrated CPs due to malacia with destruction of the cartilage were required. Post-stenting, almost full-function patterns were observed. Conclusions. Stenting at the CPs improved expiratory flow limitation by increasing the cross-sectional area, and supporting weakened airway-wall.
