Catherine Vanchiere, MD, an internal medicine resident at Temple University Hospital, is the lead researcher on work that will be presented at the American Heart Association’s virtual Scientific Sessions which found that the more fires that a firefighter fought, the higher likelihood he or she would report having been diagnosed with atrial fibrillation, or AFib, an irregular heartbeat that can lead to blood clots, stroke, heart failure and other problems. U.S. News & World Report and HealthDay picked up the news from the American Heart Association.