The influence of climate change on human cardiovascular function

Area of Science:

• Environmental Health
• Cardiovascular Medicine
• Climate Change Science

Background:

• Climate change poses significant threats to human health.
• Extreme temperatures, especially heat waves, are linked to increased cardiovascular morbidity and mortality globally.
• Endothelial dysfunction plays a crucial role in heat-induced cardiovascular damage.

Purpose of the Study:

• To review the impact of extreme ambient temperatures on cardiovascular function and health.
• To highlight the mechanisms through which heat affects the cardiovascular system.
• To emphasize the increased vulnerability of individuals with pre-existing cardiovascular diseases.

Main Methods:

• Literature review of studies examining the relationship between ambient temperature and cardiovascular outcomes.
• Analysis of biological and physiological mechanisms linking heat exposure to cardiovascular damage.
• Examination of population data on heat wave-related mortality and morbidity.

Main Results:

• Hot weather impairs blood vessel tone and structure by affecting nitric oxide synthesis, cytokine production, and systemic inflammation.
• Dehydration and increased blood viscosity during heat exposure promote thrombogenesis, impacting patients with atherosclerosis.
• Extreme temperatures increase blood pressure, blood viscosity, and heart rate, contributing to cardiovascular mortality, particularly in individuals with pre-existing CVD.

Conclusions:

• Extreme ambient temperatures pose a significant challenge to maintaining cardiovascular function.
• Heat exposure can alter drug pharmacokinetics in cardiovascular patients, worsening their health status.
• Cellular-level effects of heat, including oxidative stress and apoptosis, contribute to increased stroke risk.