Comparisons of CHADS2 and CHA2DS2-VASc scores for stroke risk stratification in atrial fibrillation: Which scoring system should be used for Asians?

Patients with a CHADS2 score of 0 were not necessarily “low risk,” and the annual stroke rate can be as high as 4.47% when patients were further stratified by the CHA2DS2-VASc score. In contrast, patients with a CHA2DS2-VASc score of 0 had a truly low risk of ischemic stroke, with an annual stroke rate around 1.15%. As with Caucasians, the CHA2DS2-VASc score should be used for stroke risk stratification in Asians.