TY - JOUR T1 - Per cent emphysema is associated with respiratory and lung cancer mortality in the general population: a cohort study JF - Thorax JO - Thorax SP - 624 LP - 632 DO - 10.1136/thoraxjnl-2015-207822 VL - 71 IS - 7 AU - Elizabeth C Oelsner AU - J Jeffrey Carr AU - Paul L Enright AU - Eric A Hoffman AU - Aaron R Folsom AU - Steven M Kawut AU - Richard A Kronmal AU - David J Lederer AU - Joao A C Lima AU - Gina S Lovasi AU - Benjamin M Smith AU - Steven J Shea AU - R Graham Barr Y1 - 2016/07/01 UR - http://thorax.bmj.com/content/71/7/624.abstract N2 - Background Emphysema on CT is a risk factor for all-cause mortality in persons with and without airflow obstruction; however, causes of death associated with emphysema remain uncertain, particularly in the general population.Aims To test associations between quantitatively assessed emphysema on CT and cause of death in persons with and without a substantial smoking history.Methods The Multi-Ethnic Study of Atherosclerosis recruited 6814 participants, aged 45–84 years and without clinical cardiovascular disease, in 2000–2002. Per cent emphysema was defined on cardiac CT as per cent of lung voxels less than −950 Hounsfield units; emphysema on CT was defined as per cent emphysema above the upper limit of normal. Cause of death was classified by administrative codes. Proportional-hazards models were adjusted for age, race/ethnicity, gender, body mass index, smoking status, pack-years, coronary artery calcium, site and education. Additional adjustment for lung function was made in a subset with spirometry from 2004 to 2006.Results There were 1091 deaths over 12 years median follow-up. Emphysema on CT was strongly associated with increased mortality due to respiratory diseases (adjusted HR 2.94, 95% CI 1.68 to 5.15), particularly chronic lower respiratory diseases (adjusted HR 9.54, 95% CI 4.70 to 19.35), and lung cancer (adjusted HR 1.84, 95% CI 1.09 to 3.12), but not cardiovascular disease. Associations persisted among participants with fewer than 10 pack-years and those without physician-diagnosed respiratory disease, and were similar after adjustment for airflow measures and in persons without airflow limitation.Conclusions Quantitatively assessed emphysema on CT is associated with greater respiratory disease and lung cancer mortality, even among persons without traditional risk factors. ER -