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Published in: Lung 4/2018

01-08-2018 | OCCUPATIONAL LUNG DISEASE

Increased Airway Wall Thickness is Associated with Adverse Longitudinal First–Second Forced Expiratory Volume Trajectories of Former World Trade Center workers

Authors: Rafael E. de la Hoz, Xiaoyu Liu, John T. Doucette, Anthony P. Reeves, Laura A. Bienenfeld, Juan P. Wisnivesky, Juan C. Celedón, David A. Lynch, Raúl San José Estépar

Published in: Lung | Issue 4/2018

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Abstract

Rationale

Occupational exposures at the WTC site after September 11, 2001 have been associated with several presumably inflammatory lower airway diseases. In this study, we describe the trajectories of expiratory air flow decline, identify subgroups with adverse progression, and investigate the association of a quantitative computed tomography (QCT) imaging measurement of airway wall thickness, and other risk factors for adverse progression.

Methods

We examined the trajectories of expiratory air flow decline in a group of 799 former WTC workers and volunteers with QCT-measured (with two independent systems) wall area percent (WAP) and at least 3 periodic spirometries. We calculated individual regression lines for first–second forced expiratory volume (FEV1), identified subjects with rapidly declining and increasing (“gainers”), and compared them to subjects with normal and “stable” FEV1 decline. We used multivariate logistic regression to model decliner vs. stable trajectories.

Results

The mean longitudinal FEV1slopes for the entire study population, and its stable, decliner, and gainer subgroups were, respectively, − 35.8, − 8, − 157.6, and + 173.62 ml/year. WAP was associated with “decliner” status (ORadj 1.08, 95% CI 1.02, 1.14, per 5% increment) compared to stable. Age, weight gain, baseline FEV1 percent predicted, bronchodilator response, and pre-WTC occupational exposures were also significantly associated with accelerated FEV1 decline. Analyses of gainers vs. stable subgroup showed WAP as a significant predictor in unadjusted but not consistently in adjusted analyses.

Conclusions

The apparent normal age-related rate of FEV1 decline results from averaging widely divergent trajectories. WAP is significantly associated with accelerated air flow decline in WTC workers.
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Metadata
Title
Increased Airway Wall Thickness is Associated with Adverse Longitudinal First–Second Forced Expiratory Volume Trajectories of Former World Trade Center workers
Authors
Rafael E. de la Hoz
Xiaoyu Liu
John T. Doucette
Anthony P. Reeves
Laura A. Bienenfeld
Juan P. Wisnivesky
Juan C. Celedón
David A. Lynch
Raúl San José Estépar
Publication date
01-08-2018
Publisher
Springer US
Published in
Lung / Issue 4/2018
Print ISSN: 0341-2040
Electronic ISSN: 1432-1750
DOI
https://doi.org/10.1007/s00408-018-0125-7

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