Temperature and cardiovascular deaths in Montreal

Area of Science:

• Environmental Health
• Cardiovascular Epidemiology
• Biometeorology

Background:

• Myocardial infarction (MI) is a leading cause of death globally.
• Environmental factors like temperature and snowfall are suspected to influence cardiovascular events.
• Previous studies have shown varying impacts of weather on MI mortality.

Purpose of the Study:

• To investigate the relationship between ambient temperature, snowfall, and myocardial infarction mortality in Montreal over a two-year period.
• To compare Montreal's findings with a parallel study in Brisbane to understand geographical differences in weather-related MI risk.

Main Methods:

• Analysis of MI mortality data over two years in Montreal.
• Correlation of mortality rates with daily temperature variations and snowfall.
• Comparison of observed trends with data from a subtropical climate (Brisbane).

Main Results:

• MI mortality increased with deviations from thermally neutral conditions.
• Montreal experienced lower death rates than Brisbane during similar temperature drops.
• A rise in mortality was observed following days with snowfall.
• Mortality decreased during anomalous cold spells, indicating potential cold avoidance behavior.

Conclusions:

• Environmental temperature deviations and snowfall are associated with increased MI mortality in Montreal.
• Behavioral thermoregulation, such as cold avoidance, may play a role in mitigating mortality during extreme cold.
• Geographical and behavioral factors influence the impact of weather on cardiovascular health.