Elizabeth C Oelsner1, J Jeffrey Carr2, Paul L Enright3, Eric A Hoffman4, Aaron R Folsom5, Steven M Kawut6, Richard A Kronmal7, David J Lederer8, Joao A C Lima9, Gina S Lovasi10, Benjamin M Smith11, Steven J Shea1, R Graham Barr1. 1. Department of Medicine, Columbia University Medical Center, New York, New York, USA Department of Epidemiology, Mailman School of Public Health at Columbia University, New York, New York, USA. 2. Department of Radiology, Vanderbilt University Medical Center, Nashville, Tennessee, USA. 3. Department of Medicine, University of Arizona, Tuscon, Arizona, USA. 4. Department of Radiology, University of Iowa, Iowa City, Iowa, USA. 5. Division of Epidemiology and Community Health, University of Minnesota, Minneapolis, Minnesota, USA. 6. Department of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA. 7. Collaborative Health Studies Coordinating Center, University of Washington, Seattle, Washington, USA. 8. Department of Medicine, Columbia University Medical Center, New York, New York, USA. 9. Department of Medicine, Johns Hopkins University, Baltimore, Maryland, USA. 10. Department of Epidemiology, Mailman School of Public Health at Columbia University, New York, New York, USA. 11. Department of Medicine, Columbia University Medical Center, New York, New York, USA Respiratory Division, McGill University, Montreal, Quebec, Canada.
Abstract
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. Published by the BMJ Publishing Group Limited. For permission to use (where not already granted under a licence) please go to http://www.bmj.com/company/products-services/rights-and-licensing/
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. Published by the BMJ Publishing Group Limited. For permission to use (where not already granted under a licence) please go to http://www.bmj.com/company/products-services/rights-and-licensing/
Entities:
Keywords:
COPD epidemiology; Emphysema; Imaging/CT MRI etc; Lung Cancer
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