Hyperinflation and air trapping are terms commonly used to reflect these changes but are not well standardized. Air trapping if rv tlc is high er than 126 of predicted by the plethysmographic method or 128 of predicted by the helium dilution method and no air trapping if rv tlc is equal to or under those values. Since lung air trapping is observed in 25 of the normal population the presence of more than 25 air trapping was a diagnostic criterion for bronchiolitis obliterans in this study.
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