[Association between air particulate matter and stroke attack or mortality: a Meta-analysis]

Area of Science:

• Environmental Health
• Epidemiology
• Public Health

Background:

• Particulate air pollution is a significant environmental risk factor.
• Stroke remains a leading cause of mortality and morbidity worldwide.
• Understanding the specific impacts of different particulate matter sizes on stroke is crucial for public health interventions.

Purpose of the Study:

• To investigate the association between daily exposure to particulate air pollution, specifically PM10 and PM2.5, and the daily incidence of stroke attacks.
• To analyze the relationship between PM10 and PM2.5 exposure and daily stroke mortality.
• To quantify the risk associated with increased concentrations of particulate matter for stroke events.

Main Methods:

• A meta-analysis was conducted on 16 quantitative studies.
• Relative odds ratios (OR) were calculated for stroke attack and mortality per 10 µg/m³ increase in particulate matter concentration.
• Sensitivity analyses were performed to validate the findings.

Main Results:

• A 10 µg/m³ increase in PM10 was associated with a 1.09% increase in daily stroke attacks (OR=1.011) and a 0.70% increase in daily stroke mortality (OR=1.007).
• For PM2.5, a 10 µg/m³ increase showed an odds ratio of 1.001 for stroke attacks and 1.052 for stroke mortality, with non-significant confidence intervals for attack.
• Sensitivity analyses confirmed the observed associations for PM10.

Conclusions:

• PM10 exposure is positively associated with increased daily stroke attacks and mortality.
• Current evidence does not support a significant association between PM2.5 exposure and daily stroke attacks or mortality.
• Public health strategies should consider the impact of PM10 on cardiovascular events like stroke.