Temperature Extremes Linked to Increased Cardiovascular Disease Mortality
New York,NY – november 2,2025 – exposure to both high and low temperatures is significantly associated wiht increased cardiovascular disease mortality globally,according to recent research published in JAMA Cardiology and the journal of the American College of Cardiology. The studies, released in June and earlier in 2024, reveal a complex relationship between ambient temperature and heart-related deaths, highlighting a growing public health concern as climate change drives more frequent and intense temperature fluctuations.
Cardiovascular disease remains the leading cause of death worldwide, and these findings suggest that temperature extremes are a contributing, and potentially modifiable, risk factor. The research indicates that millions of cardiovascular deaths annually may be attributable to non-optimal temperatures,impacting populations across all regions and socioeconomic levels. Understanding this link is crucial for developing effective mitigation strategies and protecting vulnerable communities as global temperatures continue to rise.
A study published June 2024 in JAMA Cardiology by Ma et al. investigated the association between temperature and cardiovascular mortality in the United States. Researchers found that both extremely hot and cold temperatures were linked to increased risk of cardiovascular death, with the greatest risk observed during the winter months. The study, utilizing data from 2000-2019, resolute that 13.2% of all cardiovascular deaths in the U.S. during that period were attributable to non-optimal temperatures. Specifically, the attributable fraction for cold temperatures was 8.2%, while for hot temperatures it was 5.0%. The research team identified a minimum risk temperature of 68.9°F (20.5°C).
Further bolstering these findings, research led by Hundessa, Huang, and Zhao, published in JACC in June 2024, examined global and regional cardiovascular mortality attributable to non-optimal temperatures. Their analysis, spanning from 1990 to 2019, revealed that 8.5% of global cardiovascular deaths were linked to ambient temperatures deviating from optimal levels.The study pinpointed a global optimal temperature of 66.2°F (19°C) and highlighted regional variations, with higher attributable fractions observed in colder climates. The researchers estimated that approximately 8.6 million cardiovascular deaths worldwide could be attributed to non-optimal temperatures during the study period.
These studies underscore the urgent need for public health interventions aimed at mitigating the cardiovascular impacts of temperature extremes. Strategies may include developing early warning systems for heat and cold waves, improving access to climate-controlled environments, and educating the public about the risks and preventative measures. Further research is needed to fully elucidate the biological mechanisms underlying the observed associations and to identify the most effective adaptation strategies for a warming world.
