A significant shift in US mortality has occurred, with heart attacks no longer the leading cause of death. Since 1970, deaths attributed to heart attacks have plummeted by nearly 90%. This dramatic decline is attributed to advancements in prevention, diagnosis, and treatment. However, it's important to note that while heart attack fatalities are down, deaths related to chronic heart conditions have seen a substantial increase. This suggests a change in the nature of heart-related illnesses and highlights the ongoing need for research and improved long-term cardiac care.