According to a study published this week in the Journal of the American Medical Association, after surviving a heart attack, women have a slightly higher risk than men of dying in the next 30 days. The finding, researchers say, likely reflects the differences in the type of heart failure women experience, as well as the severity of the condition. (When the severity of the heart attack was taken into consideration, the mortality rates were more comparable between men and women.) The study examined medical records for more than 136,000 patients who had suffered from acute coronary syndromes (ACS)—the broad term for when plaque comes loose inside the heart’s coronary artery, dangerously blocking blood flow. They found that, in the month after first suffering ACS, the mortality rate among men was 5.3%, compared with 9.6% in women.