Fractional exhaled NO in a metalworking occupational cohort

Purpose: Secondary metalworking carries exposure to relatively heavy levels of respirable particulate. We investigated the extent to which metalworking is associated with increased exhaled nitric oxide (FeNO), an established inflammatory biomarker. Methods: We studied 80 metalworking factory employees in Kazakhstan. Informed by industrial hygiene data, we categorized them into three groups: (1) machine operators (41%); (2) welders or assemblers (33%); and (3) all others, including administrative and ancillary staff (26%). Participants completed questionnaires covering occupational history, smoking, home particulate sources, respiratory symptoms, and comorbidities. We measured exhaled carbon monoxide (CO), exhaled fractional nitric oxide (FeNO), and spirometric function. We used mixed-effects modeling to test the associations of occupational group with FeNO, adjusted for covariates. Results: The median age was 51.5 (interquartile range 20.5) years; 7% were women. Occupational group (p < 0.01), daily current cigarette smoking intensity (p < 0.05), and age (p < 0.05), each was statistically associated with FeNO. Welders, or assemblers (Group 2), who had intermediate particulate exposure, manifested significantly higher exhaled FeNO compared to machinists (Group 1, with the highest particulate exposure) and all others (Groups 3, the lowest particulate): adjusted Group 2 mean 44.8 ppb (95% confidence interval (CI) 33.8–55.9) vs. Group 1 24.6 ppb (95% 20.5–28.7) and Group 3, 24.3 ppb (95% CI 17.7–30.9). Secondhand smoking and height were not associated with FeNO. Conclusion: In a metalworking industrial cohort, welders/assemblers manifested significantly higher levels of FeNO. This may reflect respiratory tract inflammation associated with airborne exposures specific to this group. © 2021, The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.

Authors
Vinnikov D. 1, 2 , Tulekov Z.1 , Blanc P.D.3
Publisher
Springer Science and Business Media Deutschland GmbH
Language
English
Status
Published
Year
2021
Organizations
  • 1 Al-Farabi Kazakh National University, 71 al-Farabi avenue, Almaty, 050040, Kazakhstan
  • 2 Peoples’ Friendship University of Russia (RUDN University), Moscow, Russian Federation
  • 3 University of California San Francisco, San Francisco, CA, United States
Keywords
Assembling; Exhaled nitric oxide; Inflammation; Mixed-effects model; Occupational; Welding
Date of creation
16.12.2021
Date of change
16.12.2021
Short link
https://repository.rudn.ru/en/records/article/record/76974/
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