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Increased particulate air pollution and the triggering of myocardial infarction

A Peters1, D W Dockery, J E Muller

  • 1Department of Environmental Health, Harvard School of Public Health, Boston, MA, USA.

Circulation
|June 13, 2001
PubMed
Abstract

Insights

Fine particle air pollution may trigger heart attacks (myocardial infarction or MI). Exposure to elevated PM2.5 concentrations within hours or a day before symptoms increases MI risk.

Area of Science:

  • Environmental Health
  • Cardiovascular Epidemiology
  • Air Pollution Research

Background:

  • Ambient particulate air pollution is linked to cardiovascular disease hospitalizations.
  • The specific link between high ambient particle concentrations and acute myocardial infarction (MI) onset was previously unknown.

Purpose of the Study:

  • To investigate whether elevated concentrations of ambient fine particles trigger the onset of acute myocardial infarction (MI).

Main Methods:

  • A case-crossover study involving 772 MI patients in the greater Boston area.
  • Measured hourly concentrations of fine particulate matter (PM2.5), carbon black, and gaseous pollutants.
  • Analyzed data using a case-crossover approach to assess triggering effects within 2-hour and 24-hour windows prior to MI onset.

Main Results:

  • Elevated PM2.5 concentrations were associated with an increased risk of MI onset within a 2-hour period.
  • A delayed association was observed, with increased MI risk linked to 24-hour average PM2.5 exposure 1 day before symptom onset.
  • Multivariate analysis showed significant odds ratios for both short-term (2-hour) and delayed (24-hour) PM2.5 exposure.

Conclusions:

  • Elevated fine particle air pollution concentrations may transiently increase the risk of myocardial infarction.
  • Findings suggest air pollution is a potentially preventable trigger for MI.
  • Further research in diverse locations is necessary to confirm these findings.

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