Spirometric predictors of lung function decline and mortality in early chronic obstructive pulmonary disease.

American Journal of Respiratory and Critical Care Medicine
M Bradley DrummondRobert A Wise

Abstract

The course of lung function decline for smokers with early airflow obstruction remains undefined. It is also unclear which early spirometric characteristics identify individuals at risk for rapid decline and increased mortality. To determine the association between spirometric measures and 5-year decline in FEV(1) and 12-year mortality. We analyzed longitudinal data from the Lung Health Study, a clinical trial of intensive smoking cessation intervention with or without bronchodilator therapy in 5,887 smokers with mild to moderate airflow obstruction. Participants were stratified into bins of baseline FEV(1) to FVC ratio, using bins of 5%, and separately into bins of Z-score (difference between actual and predicted FEV(1)/FVC, normalized to SD of predicted FEV(1)/FVC). Associations between spirometric measures and FEV(1) decline and mortality were determined after adjusting for baseline characteristics and time-varying smoking status. The cohort was approximately two-thirds male, predominantly of white race (96%), and with mean age of 49 ± 7 years. In general, individuals with lower lung function by any metric had more rapid adjusted FEV(1) decline. A threshold for differential decline was present at FEV(1)/FVC less than 0.65 (P...Continue Reading

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