text: <unk>  is a clinical prediction rule for the estimation of the risk of stroke among patients with non-rheumatic atrial fibrillation (AF), a common and serious cardiac arrhythmia associated with an increased risk of thromboembolic stroke.  AF can cause stasis of blood in the atria, leading to the formation of a mural thrombus that can dislodge into the blood flow, reach the brain, and cause a stroke.<unk>  is used to assess the risk of stroke and determine whether or not antithrombotic therapy is required with either anticoagulants therapy or antiplatelets for the prevention of thromboembolism.  A high<unk>  corresponds to a greater risk of stroke, while a low<unk>  corresponds to a lower risk of stroke. The<unk>  was validated by a study on non-rheumatic AF patients aged 65 to 95 who were not prescribed the anticoagulant warfarin.
option_0: CHADS2 score
option_1: IMPROVE bleeding risk score
option_2: DAPT score
option_3: PRECISE-DAPT score
option_4: HAS-BLED score
option_5: Deep vein thrombosis marder score
option_6: TIMI risk score
option_7: MAYO risk score