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Aggravation of Myocardial Ischemia upon Particulate Matter Exposure in Atherosclerosis Animal Model
Published on: December 10, 2021
Relation between short-term fine-particulate matter exposure and onset of myocardial infarction
Jeffrey Sullivan1, Lianne Sheppard, Astrid Schreuder
1University of Washington, Seattle, Washington 98105, USA. sulijh@u.washington.edu
Background:
Epidemiologic studies have reported increases in the incidence of cardiovascular morbidity and myocardial infarction (MI) associated with increases in short-term and daily levels of fine-particulate matter air pollution, suggesting a role for particulate matter in triggering an MI.
Methods:
We studied the association between onset time of MI and preceding hourly measures of fine-particulate matter using a case-crossover study of 5793 confirmed cases of acute MI. We linked data from a community-wide database on acute MI from 1988-1994 in King County, Washington, with central site air pollution monitoring data on fine-particulate matter determined by nephelometry. We compared air pollution exposure levels averaged 1 hour, 2 hours, 4 hours, and 24 hours before MI onset to a set of time-stratified referent exposures from the same day of the week in the month of the case event.
Results:
: The estimated relative risk for a 10-microg/m increase in fine-particulate matter the hour before MI onset was 1.01 (95% CI=0.98-1.05). Analyses of pollutant levels at the other time points demonstrated a similar lack of association. No increased risk was found in all cases with preexisting cardiac disease (odds ratio = 1.05; 0.95-1.16). Stratification by known cardiovascular risk factors (hypertension, diabetes, and smoking status) also did not modify the relation between fine-particulate matter and MI onset.
Conclusion:
Although a very small effect cannot be excluded, there was no consistent association between ambient levels of fine-particulate matter and risk of MI onset.
Insights
This study found no consistent link between fine particulate matter air pollution and the onset of myocardial infarction (MI). Researchers observed no increased risk even in individuals with existing heart conditions or common cardiovascular risk factors.
Area of Science:
- Environmental Health
- Cardiovascular Epidemiology
- Air Pollution Research
Background:
- Epidemiologic studies suggest a correlation between elevated fine particulate matter (PM2.5) air pollution and increased incidence of cardiovascular morbidity and myocardial infarction (MI).
- These findings imply a potential role for particulate matter in triggering acute MI events.
Purpose of the Study:
- To investigate the association between the timing of MI onset and preceding hourly levels of fine particulate matter.
- To determine if short-term exposure to fine particulate matter triggers acute myocardial infarction.
Main Methods:
- A case-crossover study design was employed, analyzing 5793 confirmed acute MI cases from King County, Washington (1988-1994).
- Hourly fine particulate matter data, measured by nephelometry, were linked to MI onset times.
- Exposure levels in the 1, 2, 4, and 24 hours preceding MI onset were compared to time-stratified referent exposures.
Main Results:
- A 10-microg/m increase in fine particulate matter one hour before MI onset showed a relative risk of 1.01 (95% CI=0.98-1.05), indicating no significant association.
- Similar lack of association was observed for pollutant levels at other time points.
- No increased risk was detected in patients with pre-existing cardiac disease or when stratified by hypertension, diabetes, or smoking status.
Conclusions:
- The study found no consistent association between ambient fine particulate matter levels and the risk of myocardial infarction onset.
- While a very small effect cannot be entirely ruled out, the current evidence does not support a significant link.
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