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  • Temperature spike may...

Temperature spike may exacerbate existing heart disease among men

Written By : Dr. Kamal Kant Kohli Published On 2022-03-25T09:45:23+05:30  |  Updated On 25 March 2022 9:55 AM IST
Temperature spike may exacerbate existing heart disease among men
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According to a study presented at the American College of Cardiology's 71st Annual Scientific Session, extreme heat accounted for about 600-700 additional deaths from cardiovascular disease annually over a decade-long period in the U.S.

The spike in deaths during heat waves was most pronounced in men and non-Hispanic Black adults, suggesting climate change may exacerbate existing heart disease disparities for these groups in the coming years.

Extreme heat events are on the rise in the U.S., which now sees about three times as many heat waves per year compared to the 1960s due to climate change. Heat can cause increased strain on the heart and trigger events such as heart attacks. In addition, some heart disease risk factors, such as diabetes—as well as heart medications, such as diuretics and beta blockers—can affect a person's ability to regulate their body temperature and make it difficult to handle extreme heat. This study is the first to assess trends in heart disease deaths during extreme heat events on a nationwide scale. The researchers said previously reported studies that focused on specific cities or relied on heat being listed as an official cause of death likely underestimate the true toll of these events.

"These results suggest the full extent of the adverse health effects of extreme heat is broader than previously realized," said Sameed Ahmed Khatana, MD, assistant professor of medicine at the University of Pennsylvania and the study's lead author. "Climate change and its consequences will have a very large impact on our society in terms of health, and cardiovascular health is an important component of that."

The researchers analyzed temperature trends and cardiovascular mortality in all 3,108 counties in the contiguous U.S. Using data from the Centers for Disease Control and Prevention National Environmental Health Tracking Network, each county's baseline average daily maximum temperature was calculated based on temperature records from 1979-2007. The researchers then identified extreme heat days that occurred in the decade from 2008-2017, defined as days when the heat index reached 90 F or higher, and the maximum heat index was in the 99th percentile of the daily maximum heat index in the baseline period for that day. Data from the National Center for Health Statistics was used to assess trends in cardiovascular mortality for the same decade.

Overall results revealed that each additional day of extreme heat in a month was associated with a 0.13% increase in deaths from heart disease, equating to an average of 600-700 additional deaths per year across the decade studied. However, different trends were observed among genders and racial groups. For men, each day of extreme heat was associated with a 0.21% increase in cardiovascular mortality, but there was no significant association for women. Among non-Hispanic Black populations, each day of extreme heat was associated with a 0.27% increase in mortality, but there was no significant association for non-Hispanic white or Hispanic populations. According to the researchers, these findings suggest that cardiovascular mortality burden of heat waves is borne disproportionately by men and by Black communities.

"We were surprised by the significant heterogeneity across racial subgroups and across genders," Khatana said. "Extreme heat has an important effect on cardiovascular mortality across the country; however, that effect is being felt disproportionately in different populations."

Researchers said several factors may contribute to these disparities. For example, the higher proportion of men working in sectors where it can be harder to avoid sustained heat exposure, such as construction and agriculture, could account for some of the difference between genders. The higher risk among Black populations could be related to systemic health disparities and to differences in the built environment—such as less access to air conditioning and heat-protective tree cover—that have resulted from a history of segregation and discrimination in predominately Black neighborhoods.

Khatana said clinicians, city planners and leaders need to recognize the growing health toll of extreme heat and work to prepare hospitals for heat-related surges by providing access to cooling centers and better protecting vulnerable populations, such as the elderly. Modifications to the built environment, such as planting more trees in urban areas, can also help to reduce the impact of heat waves.

"Policy leaders also need to realize that climate negotiations have a real impact on people's health here in the U.S. and in their own communities," Khatana said. "The health impacts of climate change have been happening for a while and are likely to continue to get worse with rising temperatures."

American College of CardiologyExtreme heatheat wavescardiovascular mortalitymyocadial infarction
Source : American College of Cardiology
Dr. Kamal Kant Kohli
Dr. Kamal Kant Kohli

Dr Kamal Kant Kohli-MBBS, DTCD- a chest specialist with more than 30 years of practice and a flair for writing clinical articles, Dr Kamal Kant Kohli joined Medical Dialogues as a Chief Editor of Medical News. Besides writing articles, as an editor, he proofreads and verifies all the medical content published on Medical Dialogues including those coming from journals, studies,medical conferences,guidelines etc. Email: drkohli@medicaldialogues.in. Contact no. 011-43720751

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