American Journal of Respiratory and Critical Care Medicine. 162(3):1102–1108, SEPTEMBER 1ST, 2000

DOI: 10.1164/ajrccm.162.3.9907120

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PMID: 10988137

Issn Print: 1073-449X

Publication Date: September 1st, 2000


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Computed Tomographic Measurements of Airway Dimensions and Emphysema in Smokers: Correlation with Lung Function

YASUTAKA NAKANO;SHIGEO MURO;HIROAKI SAKAI;TOYOHIRO HIRAI;KAZUO CHIN;MITSUHIRO TSUKINO;KOICHI NISHIMURA;HARUMI ITOH;PETER PARÉ;JAMES HOGG;MICHIAKI MISHIMA;

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Abstract

Chronic obstructive pulmonary disease (COPD) is characterized by the presence of airflow obstruction caused by emphysema or airway narrowing, or both. Low attenuation areas (LAA) on computed tomography (CT) have been shown to represent macroscopic or microscopic emphysema, or both. However CT has not been used to quantify the airway abnormalities in smokers with or without airflow obstruction. In this study, we used CT to evaluate both emphysema and airway wall thickening in 114 smokers. The CT measurements revealed that a decreased FEV1 (%predicted) is associated with an increase of airway wall area and an increase of emphysema. Although both airway wall thickening and emphysema (LAA) correlated with measurements of lung function, stepwise multiple regression analysis showed that the combination of airway and emphysema measurements improved the estimate of pulmonary function test abnormalities. We conclude that both CT measurements of airway dimensions and emphysema are useful and complementary in the evaluation of the lung of smokers.

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