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Atrial fibrillation (AF) is the most common sustained cardiac arrhythmia, which has been increasing dramatically. AF has unfavorable consequences, such as stroke, heart failure, and cardiovascular death. Of these, stroke has been considered to be the serious complication. Recently, direct oral anticoagulation or new technologies, such as the WATCHMAN left atrium (LA) appendage closure device, have emerged to prevent stroke. Therefore, the accurate estimation of thromboembolic risk and appropriate prevention are essential for high-risk