Patterns of Lung Disease in a “Normal” Smoking Population: Are Emphysema and Airflow Obstruction Found Together?

Abstract

Study objectivesWe determined whether emphysema demonstrated on high-resolution CT (HRCT) scanning in apparently well smokers is associated with airflow obstruction. InterventionsLung function testing and limited HRCT scanning. DesignLung function measurements and scans were analyzed independently of each other. We used analysis of covariance to compare FEV1 and maximum expiratory flow at 50% of vital capacity (MEF50) values after suitable corrections, between subjects with and without parenchymal damage (emphysema and/or reduced carbon monoxide transfer coefficient[Kco]), and to compare indexes of parenchymal damage between subjects with and without airflow obstruction. SettingRadiology and lung function departments of a district general hospital. ParticipantsEighty current cigarette smokers and 20 lifetime nonsmoking control subjects (aged 35 to 65 years) who volunteered following publicity in local media. In all subjects, FEV1 was > 1.5 L; no subjects were known to have lung disease. Measurements and resultsFEV1 and MEF50 were measured spirometrically; static lung volumes were measured by helium dilution and body plethysmography; Kco was measured by a single-breath technique. HRCT scans were analyzed for emphysema by two radiologists. Of smokers, 25% had HRCT emphysema, generally mild; 16.3% and 25% had reduced FEV1 and MEF50, respectively; 12.5% had reduced Kco. Smokers with airflow obstruction were not more likely to have parenchymal damage. Smokers with parenchymal damage did not have reduced airway function. Nonsmokers generally had normal airways and parenchyma. Conclusions“Normal” smokers with lung damage had either airflow obstruction or parenchymal damage, but not generally both.