Loehr LR, Soliman EZ, Poon AK, et al. - Among participants in the Atherosclerosis Risk in Communities (ARIC), researchers sought to estimate the prevalence of atrial fibrillation (AF) on 48-hour ambulatory electrocardiography (aECG) in African Americans vs whites. The study sample comprised 1,193 individuals with a mean age of 78 years, 62% were African Americans and 64% were female. The likelihood of having hypertension and diabetes was greater in African Americans vs whites but the probability of having coronary heart disease was lower. Findings revealed a lower prevalence of AF in African American vs white older adults, irrespective of detection method (aECG or ARIC study ECG). As for new AF cases, the overall detection with aECG was low. Longer-term monitoring is recommended to better assess AF by race in future investigations.