Study finds higher cardiac deaths in combined day-night heatwaves
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Updates every hour. Last Updated: 10-Sep-2025 00:11 ET (10-Sep-2025 04:11 GMT/UTC)
Cardiac deaths increase significantly during compound heatwaves—heatwaves where temperatures are elevated both during the day and overnight—according to a new study in JACC, the flagship journal of the American College of Cardiology. The study also found that some types of heart disease are more sensitive to heatwaves than others and that different types of heatwaves may impact heart health in distinct, nonlinear ways.
Sedentary behavior has become a national health crisis, with 1 in 4 U.S. adults sitting for more than eight hours a day, increasing their risk for heart disease, stroke, and mental health challenges, according to the Centers for Disease Control and Prevention. To help people move more, the American Heart Association, a global force changing the future of health of all, invites communities nationwide to walk together on Wednesday, April 2.
The overall survival rate of athletes who suffer sudden cardiac arrest has improved over the past decade, but the likelihood of surviving varies by race, where the cardiac arrest occurred and what athletes were doing when they collapsed, according to featured clinical research presented at the American College of Cardiology’s Annual Scientific Session (ACC.25) and simultaneously published in JACC.
New findings, published in JAMA, indicate that while the rate of marathon runners who suffer cardiac arrests remained unchanged, their chance for survival is twice what it was in the past. Now, far fewer marathon runners who suffer cardiac arrest are dying of it.