Climate change is set to have a devastating impact on cardiovascular health in the United States, with deaths from extreme heat expected to nearly triple by mid-century, according to a new study. The research, supported by the National Institutes of Health, reveals that the frequency of very hot days, brought on by global warming, will significantly increase the risk of heat-related cardiovascular deaths. The study predicts that the annual average of 1,651 deaths recorded in recent years will surge to 4,320 by mid-century. Older adults and Black individuals, already facing health disparities, are expected to suffer the most from this climate-induced crisis.
Extreme heat poses a universal threat to health, putting additional strain on the cardiovascular system, particularly for those with pre-existing conditions such as heart disease. As temperatures rise, the heart has to work harder, increasing the likelihood of heart attacks, strokes, and other life-threatening episodes. Amidst the challenging circumstances, older and Black adults face even greater risks due to chronic illnesses and socio-economic factors, including a lack of access to air conditioning.
Sameed Khatana, an assistant professor of medicine at the University of Pennsylvania and co-author of the study, emphasizes the urgent need for action, stating that "the health burdens from extreme heat will continue to grow within the next several decades." As extreme heat disproportionately affects different populations, it also exacerbates existing health disparities and further deepens social inequities.
To arrive at their predictions, Khatana and his co-authors analyzed county-level data from 2008 to 2019, establishing a baseline for summer months in the contiguous 48 states. They studied the correlation between extreme heat (defined as days with a heat index of 90°F or higher) and cardiovascular mortality, while also considering humidity levels and projected population changes. Using a middle-of-the-road climate emissions projection, the researchers modeled how heat would increase and calculated its impact on mortality. They note that if emissions rise sharply, the death toll could escalate further to 5,491 individuals.
In light of these alarming findings, Khatana and his team advocate for infrastructural upgrades to help communities adapt to the hotter future. This paper underscores the growing chorus of medical professionals raising concerns about the detrimental effects of excessive heat on public health and its potential to perpetuate existing inequalities. Last summer, Europe experienced record-breaking temperatures, resulting in over 60,000 premature deaths, as reported in a study published in July.
As the threat of climate change intensifies, urgent action is needed to mitigate its impact on public health. Policies and investments should prioritize equitable measures to protect vulnerable populations, such as improving access to air conditioning, establishing cooling centers, and implementing urban design strategies that mitigate the urban heat island effect. By addressing the root causes and consequences of extreme heat, societies can work towards a more sustainable and equitable future.