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14.12.2018 | Chest

Longitudinal airway remodeling in active and past smokers in a lung cancer screening population

verfasst von: Bertram J. Jobst, Oliver Weinheimer, Torben Buschulte, Mila Trauth, Jan Tremper, Stefan Delorme, Nikolaus Becker, Erna Motsch, Marie-Luise Groß, Anke Trotter, Monika Eichinger, Hans-Ulrich Kauczor, Mark O. Wielpütz

Erschienen in: European Radiology | Ausgabe 6/2019

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Abstract

Objectives

To longitudinally investigate smoking cessation-related changes of quantitative computed tomography (QCT)–based airway metrics in a group of heavy smokers.

Methods

CT scans were acquired in a lung cancer screening population over 4 years at 12-month intervals in 284 long-term ex-smokers (ES), 405 continuously active smokers (CS), and 31 subjects who quitted smoking within 2 years after baseline CT (recent quitters, RQ). Total diameter (TD), lumen area (LA), and wall percentage (WP) of 1st–8th generation airways were computed using airway analysis software. Inter-group comparison was performed using Mann-Whitney U test or Student’s t test (two groups), and ANOVA or ANOVA on ranks with Dunn’s multiple comparison test (more than two groups), while Fisher’s exact test or chi-squared test was used for categorical data. Multiple linear regression was used for multivariable analysis.

Results

At any time, TD and LA were significantly higher in ES than CS, for example, in 5th–8th generation airways at baseline with 6.24 mm vs. 5.93 mm (p < 0.001) and 15.23 mm² vs. 13.51 mm² (p < 0.001), respectively. RQ showed higher TD (6.15 mm vs. 5.93 mm, n.s.) and significantly higher LA (14.77 mm² vs. 13.51 mm², p < 0.001) than CS after 3 years, and after 4 years. In multivariate analyses, smoking status independently predicted TD, LA, and WP at baseline, at 3 years and 4 years (p < 0.01–0.001), with stronger impact than pack years.

Conclusions

Bronchial dimensions depend on the smoking status. Smoking-induced airway remodeling can be partially reversible after smoking cessation even in long-term heavy smokers. Therefore, QCT-based airway metrics in clinical trials should consider the current smoking status besides pack years.

Key Points

• Airway lumen and diameter are decreased in active smokers compared to ex-smokers, and there is a trend towards increased airway wall thickness in active smokers.

• Smoking-related airway changes improve within 2 years after smoking cessation.

• Smoking status is an independent predictor of airway dimensions.

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Titel: Longitudinal airway remodeling in active and past smokers in a lung cancer screening population
verfasst von: Bertram J. Jobst
Oliver Weinheimer
Torben Buschulte
Mila Trauth
Jan Tremper
Stefan Delorme
Nikolaus Becker
Erna Motsch
Marie-Luise Groß
Anke Trotter
Monika Eichinger
Hans-Ulrich Kauczor
Mark O. Wielpütz
Publikationsdatum: 14.12.2018
Verlag: Springer Berlin Heidelberg
Erschienen in: European Radiology / Ausgabe 6/2019
Print ISSN: 0938-7994
Elektronische ISSN: 1432-1084
DOI: https://doi.org/10.1007/s00330-018-5890-4

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Longitudinal airway remodeling in active and past smokers in a lung cancer screening population