High alveolar nitric oxide is associated with steeper lung function decline in foundry workers.

Area of Science:

• Occupational Medicine
• Pulmonary Medicine
• Biomarkers of Inflammation

Background:

• Occupational dust exposure is a known cause of pulmonary inflammation.
• Alveolar nitric oxide concentration (C_ANO) in exhaled breath reflects peripheral lung inflammation.
• Foundry workers face significant risks from chronic dust exposure.

Purpose of the Study:

• To investigate the association between cumulative dust exposure and changes in C_ANO over time.
• To determine if baseline C_ANO can predict future lung function impairment in foundry workers.
• To evaluate C_ANO as a potential screening tool for occupational lung disease.

Main Methods:

• Longitudinal study of 74 dust-exposed and 42 non-exposed foundry workers.
• Measurement of C_ANO and lung function (including forced vital capacity - FVC) at baseline and after 7 years.
• Statistical analysis to assess correlations between dust exposure, C_ANO levels, and lung function decline.

Main Results:

• Increased C_ANO during follow-up was positively associated with cumulative dust exposure (p=0.035).
• Higher baseline C_ANO significantly predicted an accelerated decline in FVC (p=0.021 for absolute, p=0.017 for relative decrease).
• Findings suggest ongoing pulmonary inflammation in dust-exposed foundry workers.

Conclusions:

• Cumulative dust exposure in foundries is linked to increasing C_ANO, indicating persistent lung inflammation.
• Baseline C_ANO serves as a predictive marker for accelerated lung function decline.
• C_ANO measurement shows promise as a screening tool for identifying high-risk foundry workers.