Body & Brain

Cancer treatment raises stroke risk, plus ankle-powered sprints, irregular heartbeats and more in this week’s news

Heart arrhythmia signals risk for women Healthy middle-aged women who experience atrial fibrillation, the most common kind of irregular heartbeat, face a heightened risk of death. Of nearly 35,000 women over age 45, 1,011 developed atrial fibrillation during a 15-year study by a U.S.-Swiss