Chest
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Clinical Trial
Significant Spirometric Transitions and Preserved Ratio Impaired Spirometry Among Ever Smokers.
Emerging data from longitudinal studies suggest that preserved ratio impaired spirometry (PRISm), defined by proportionate reductions in FEV1 and FVC, is a heterogeneous population with frequent transitions to other lung function categories relative to individuals with normal and obstructive spirometry. Controversy regarding the clinical significance of these transitions exists (eg, whether transitions merely reflect measurement variability or noise). ⋯ gov.