Extreme Weather Events, Air Pollution, and Cardiovascular Health: Mechanisms and Challenges.

Area of Science:

• Environmental Health
• Cardiovascular Physiology
• Climate Change Impacts

Background:

• Increasing frequency and severity of extreme weather events and air pollution present significant public health challenges.
• Adverse cardiovascular effects of environmental stressors are recognized, but underlying physiological mechanisms require further elucidation.
• Existing research often overlooks the complex interplay between environmental hazards and cardiovascular disease (CVD) pathophysiology.

Purpose of the Study:

• To comprehensively review the physiological mechanisms linking extreme weather events and air pollution to cardiovascular disease.
• To explore pathways acting directly on the heart and those mediated by non-cardiac organs.
• To enhance understanding of cardiovascular risks associated with climate hazards for improved public health strategies.

Main Methods:

• Systematic literature review focusing on physiological mechanisms.
• Analysis of pathways involving airborne particulate matter translocation to the heart via the respiratory system.
• Examination of how extreme weather impacts traditional CVD risk factors, autonomic function, oxidative stress, inflammation, coagulation, and behavior.

Main Results:

• Airborne particulate pollutants can directly cause cardiac injury by reaching the heart through the respiratory system.
• Extreme weather events exacerbate CVD risk by influencing autonomic nervous system responses, oxidative stress, inflammation, and coagulation.
• Behavioral factors and traditional risk factors are also modulated by climate hazards, contributing to cardiovascular outcomes.

Conclusions:

• Both direct cardiac effects and indirect mechanisms mediated by other organ systems contribute to cardiovascular disease under environmental stress.
• A comprehensive understanding of these physiological pathways is essential for addressing the growing cardiovascular burden of climate change.
• Further research into these mechanisms can inform targeted interventions and public health policies to protect cardiovascular health.