Rate of progression of CT-quantified emphysema in male current and ex-smokers: a follow-up study

F.A.A. Mohamed Hoesein, P. Zanen, P.A. de Jong, B. van Ginneken, H.M. Boezen, H.J. Groen, M. Oudkerk, H.J. de Koning, D.S. Postma and J.-W.J. Lammers

Respiratory Research 2013;14:55

DOI PMID

Abstract

BACKGROUND: Little is known about the factors associated with CT-quantified emphysema progression in heavy smokers. The objective of this study was to investigate the effect of length of smoking cessation and clinical / demographical factors on the rate of emphysema progression and FEV1-decline in male heavy smokers. METHODS: 3,670 male smokers with mean (SD) 40.8 (17.9) packyears underwent chest CT scans and pulmonary function tests at baseline and after 1 and 3 years follow-up. Smoking status (quitted >=5, >=1-<5, <1 years or current smoker) was noted. Rate of progression of emphysema and FEV1-decline after follow-up were assessed by analysis of variance adjusting for age, height, baseline pulmonary function and emphysema severity, packyears, years in study and respiratory symptoms. The quitted >=5 group was used as reference. RESULTS: Median (Q1-Q3) emphysema severity,<-950 HU, was 8.8 (5.1 -- 14.1) and mean (SD) FEV1 was 3.4 (0.73) L or 98.5 (18.5) % of predicted. The group quitted '>5 years' showed significantly lower rates of progression of emphysema compared to current smokers, 1.07% and 1.12% per year, respectively (p<0.001). Current smokers had a yearly FEV1-decline of 69 ml, while subjects quit smoking >5 years had a yearly decline of 57.5 ml (p<0.001). CONCLUSION: Quit smoking >5 years significantly slows the rate of emphysema progression and lung function decline.Trial registration: Registered at www.trialregister.nl with trial number ISRCTN63545820.

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