American College of Cardiology Apr 1 2025 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. The research highlights the