Particulate Matter Associations with Lung Function in Pulmonary Sarcoidosis

Area of Science:

• Environmental Health
• Pulmonology
• Epidemiology

Background:

• Sarcoidosis frequently affects the lungs, with environmental factors implicated in its incidence.
• The impact of specific environmental exposures, like air pollution, on sarcoidosis clinical outcomes is not well understood.

Purpose of the Study:

• To investigate the association between ambient particulate matter ≤2.5µm (PM2.5) exposure and lung function in patients with pulmonary sarcoidosis.
• To determine if PM2.5 influences the rate of lung function decline over time.

Main Methods:

• Utilized satellite-derived measurements of PM2.5, matched to patient addresses for 5-year pre-enrollment exposure assessment.
• Employed linear models for baseline lung function (FEV1, FVC, DLCO) and linear mixed-effects models for annual lung function change.
• Analyzed data from two prospective cohorts of non-smoking adults with diagnosed pulmonary sarcoidosis.

Main Results:

• Higher PM2.5 exposure in the U.S. cohort (12.3µg/m3) compared to the Canadian cohort (8.0µg/m3).
• Each 1µg/m3 increase in PM2.5 correlated with lower baseline FEV1 and FVC in the U.S. cohort (p<0.05).
• PM2.5 and its constituents (sulfate, nitrate, ammonium) were linked to accelerated decline in FEV1, FVC, and DLCO in the U.S. cohort.

Conclusions:

• Elevated PM2.5 exposure is associated with increased pulmonary sarcoidosis severity and disease progression.
• Environmental exposure disparities significantly impact sarcoidosis outcomes.
• Air quality interventions may be crucial for managing sarcoidosis progression.