Hospital stays involving atrial fibrillation increased more than 50 percent for Americans age 18 to 64 from 1998 to 2014. Rates have stabilized in recent years for those age 65 and older. Source: AHRQ, Healthcare Cost and Utilization Project Statistical Brief #236: Inpatient Stays Involving Atrial Fibrillation, 1998-2014: https://www.hcup-us.ahrq.gov/reports/statbriefs/sb236-Atrial-Fibrillation-Hospital-Stays-Trends.jsp