Inflammatory Biomarkers Predict Airflow Obstruction After Exposure to World Trade Center Dust

• Published in: Chest Vol. 142; no. 2; pp. 412 - 418
• Main Authors: Nolan, Anna, MD, FCCP, Naveed, Bushra, MD, Comfort, Ashley L., BS, Ferrier, Natalia, MD, Hall, Charles B., PhD, Kwon, Sophia, MPH, Kasturiarachchi, Kusali J., BA, Cohen, Hillel W., DrPH, Zeig-Owens, Rachel, MPH, Glaser, Michelle S., MPH, Webber, Mayris P., DrPH, Aldrich, Thomas K., MD, FCCP, Rom, William N., MD, FCCP, Kelly, Kerry, MD, Prezant, David J., MD, FCCP, Weiden, Michael D., MD
• Format: Journal Article
• Language: English
• Published: Northbrook, IL American College of Chest Physicians 01-08-2012
• Subjects: Adult; Airway Obstruction - blood; Airway Obstruction - diagnosis; Airway Obstruction - etiology; Biological and medical sciences; Biomarkers - blood; Cardiology. Vascular system; Case-Control Studies; Cohort Studies; Cytokines - blood; Dust; Firefighters; Forced Expiratory Volume; Humans; Inflammation Mediators - blood; Medical sciences; Middle Aged; New York City; Occupational Exposure - adverse effects; Original Research; Pneumology; Pulmonary/Respiratory; September 11 Terrorist Attacks; Time Factors; World; New York City; Center; Air flow; Dust; Biological marker; Anesthesia; Exposure; Circulatory system; Cardiology; Predictive factor; Obstruction
• ISSN: 0012-3692; 1931-3543
• DOI: 10.1378/chest.11-1202

Background The World Trade Center (WTC) collapse on September 11, 2001, produced airflow obstruction in a majority of firefighters receiving subspecialty pulmonary evaluation (SPE) within 6.5 years post-September 11, 2001. Methods In a cohort of 801 never smokers with normal pre-September 11, 2001, FEV1 , we correlated inflammatory biomarkers and CBC counts at monitoring entry within 6 months of September 11, 2001, with a median FEV1 at SPE (34 months; interquartile range, 25-57). Cases of airflow obstruction had FEV1 less than the lower limit of normal (LLN) (100 of 801; 70 of 100 had serum), whereas control subjects had FEV1 greater than or equal to LLN (153 of 801; 124 of 153 had serum). Results From monitoring entry to SPE years later, FEV1 declined 12% in cases and increased 3% in control subjects. Case subjects had elevated serum macrophage derived chemokine (MDC), granulocyte-macrophage colony-stimulating factor (GM-CSF), granulocyte colony-stimulating factor, and interferon inducible protein-10 levels. Elevated GM-CSF and MDC increased the risk for subsequent FEV1 less than LLN by 2.5-fold (95% CI, 1.2-5.3) and 3.0-fold (95% CI, 1.4-6.1) in a logistic model adjusted for exposure, BMI, age on September 11, 2001, and polymorphonuclear neutrophils. The model had sensitivity of 38% (95% CI, 27-51) and specificity of 88% (95% CI, 80-93). Conclusions Inflammatory biomarkers can be risk factors for airflow obstruction following dust and smoke exposure. Elevated serum GM-CSF and MDC levels soon after WTC exposure were associated with increased risk of airflow obstruction in subsequent years. Biomarkers of inflammation may help identify pathways producing obstruction after irritant exposure.