Air pollution and venous thrombosis: a meta-analysis

Area of Science:

• Environmental Health
• Cardiovascular and Respiratory Medicine
• Thrombotic Disorders

Background:

• Air pollution is a known risk factor for cardiovascular and respiratory diseases.
• The association between air pollution exposure and venous thrombotic disorders remains unclear.
• Existing research has not definitively established a causal link.

Purpose of the Study:

• To conduct a meta-analysis assessing the relationship between exposure to major air pollutants and the risk of venous thrombosis.
• To synthesize evidence from multiple studies to determine if air quality impacts venous thromboembolism incidence.

Main Methods:

• A comprehensive literature search was performed across multiple databases (PubMed, Embase, Web of Science, etc.).
• Studies investigating air pollutants (CO, SO2, NO2, O3, PM2.5, PM10) and venous thrombosis were included.
• A random-effects model was used to derive risk estimates for pollutant concentration increments, analyzing approximately 700,000 events from 8 studies.

Main Results:

• No significant association was found between major air pollutants (PM2.5, PM10, NO2) and an increased risk of venous thrombosis.
• Overall odds ratios (OR) for pollutants like PM2.5 (1.005), PM10 (0.995), and NO2 (1.006) indicated no increased risk.
• Subgroup analyses based on exposure duration and thrombosis location yielded consistent results, with no evidence of publication bias.

Conclusions:

• This meta-analysis does not support air pollution as a significant risk factor for venous thrombosis in the general population.
• The findings suggest that other factors likely play a more prominent role in the development of venous thromboembolic events.
• Further research may be warranted to explore potential indirect effects or specific susceptible subgroups.