Rafael E de la Hoz1,2,3, Xiaoyu Liu4, John T Doucette5, Anthony P Reeves6, Laura A Bienenfeld7, Juan P Wisnivesky8, Juan C Celedón9, David A Lynch10, Raúl San José Estépar11. 1. Department of Environmental Medicine and Public Health, Icahn School of Medicine at Mount Sinai, New York, NY, USA. Rafael.delaHoz@mssm.edu. 2. Department of Medicine, Icahn School of Medicine at Mount Sinai, New York, NY, USA. Rafael.delaHoz@mssm.edu. 3. Division of Occupational Medicine, Icahn School of Medicine at Mount Sinai, One Gustave L. Levy Place, WTC HP CCE, Box 1059, New York, NY, 10029, USA. Rafael.delaHoz@mssm.edu. 4. Department of Population Health Science and Policy, Icahn School of Medicine at Mount Sinai, New York, NY, USA. 5. Department of Environmental Medicine and Public Health, Icahn School of Medicine at Mount Sinai, New York, NY, USA. 6. School of Electrical and Computer Engineering, Cornell University, Ithaca, NY, USA. 7. Department of Medicine, New York University School of Medicine, New York, NY, USA. 8. Department of Medicine, Icahn School of Medicine at Mount Sinai, New York, NY, USA. 9. Division of Pediatric Pulmonary Medicine, Allergy and Immunology, Children's Hospital of Pittsburgh, University of Pittsburgh Medical Center, University of Pittsburgh, Pittsburgh, PA, USA. 10. Department of Radiology, National Jewish Health, Denver, CO, USA. 11. Department of Radiology, Brigham and Women's Hospital, Boston, MA, USA.
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.
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.
Entities:
Keywords:
2001; Chronic bronchitis; Multidetector computed tomography; Occupational disease; Smoke inhalation injury; Spirometry; World Trade Center Attack
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