Left atrial spontaneous echo contrast occurring in patients with low CHADS2 or CHA2DS2-VASc scores.

LASEC was present in a considerable proportion of patients with nonvalvular AF under low thromboembolic risk scores. Information on AF chronicity, BNP, and LV hypertrophy might help identify patients at risk for thromboembolism, although large-scale studies are necessary to confirm our observations.