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The USPSTF finds little evidence for using ECG to detect asymptomatic atrial fibrillation. Atrial fibrillation, the most common type of arrhythmia, affects about 3% of men and 2% of women ages 65 to 69 and about 10% of adults 85 years and older, placing these populations at up to a fivefold risk for ischemic stroke. After a review of studies examining the use of electrocardiography (ECG) in detecting previously undiagnosed atrial fibrillation, the U.S. Preventative Services Task Force (USPSTF) found little evidence supporting its use in asymptomatic adults 65 years and older. In addition, the agency found few studies that examined the effectiveness of early detection and treatment or directly examined the harms of using ECG in screening. Ongoing trials may clarify the best approach of screening for atrial fibrillation. The full report appeared in the August 7 issue of JAMA.