Variation in the Percent of Emphysema-like Lung in a Healthy, Nonsmoking Multiethnic Sample. The MESA Lung Study

作者：Eric A. Hoffman, Firas S. Ahmed, Heather Baumhauer, Matthew J. Budoff, J. Jeffrey Carr, Richard A. Kronmal, Sony Reddy, R. Graham Barr · 发表于：Annals of the American Thoracic Society · 年份：2014 · DOI：10.1513/annalsats.201310-364oc · 被引用次数：119 · 研究领域：Chronic Obstructive Pulmonary Disease (COPD) Research、Delphi Technique in Research、Interstitial Lung Diseases and Idiopathic Pulmonary Fibrosis

RATIONALE: Computed tomography (CT)-based lung density is used to quantitate the percentage of emphysema-like lung (hereafter referred to as percent emphysema), but information on its distribution among healthy nonsmokers is limited. OBJECTIVES: We evaluated percent emphysema and total lung volume on CT scans of healthy never-smokers in a multiethnic, population-based study. METHODS: The Multi-Ethnic Study of Atherosclerosis (MESA) Lung Study investigators acquired full-lung CT scans of 3,137 participants (ages 54-93 yr) between 2010-12. The CT scans were taken at full inspiration following the Subpopulations and Intermediate Outcome Measures in COPD Study (SPIROMICS) protocol. "Healthy never-smokers" were defined as participants without a history of tobacco smoking or respiratory symptoms and disease. "Percent emphysema" was defined as the percentage of lung voxels below -950 Hounsfield units. "Total lung volume" was defined by the volume of lung voxels. MEASUREMENTS AND MAIN RESULTS: Among 854 healthy never-smokers, the median percent emphysema visualized on full-lung scans was 1.1% (interquartile range, 0.5-2.5%). The percent emphysema values were 1.2 percentage points higher among men compared with women and 0.7, 1.2, and 1.2 percentage points lower among African Americans, Hispanics, and Asians compared with whites, respectively (P < 0.001). Percent emphysema was positively related to age and height and inversely related to body mass index. The findings were similar for ...