See also Medscape's Atrial Fibrillation CHADS2 Score for Stroke Risk calculator. Although simple, the CHADS 2 score does not include many common stroke risk factors, and its limitations have been highlighted by its non-inclusion of common stroke risk factors. For patients who are identified as moderate (score 1-2) or high risk for ischemic stroke ( 3), anticoagulation therapy should be considered. For those patients in whom anticoagulation is considered, bleeding risk scores such as ATRIA , HAS-BLED or HEMORR 2 HAGES can be used to determine the risk for warfarin-associated hemorrhage. CHADS2 Score for AF Assess risk of stroke in atrial fibrillation CHA2DS2-VASc Score for AF Replacement for CHADS2 for stroke prediction in atrial fibrillation Bleeding Risk in Atrial Fibrillation: HAS-BLED Score Understand the risk of bleeding from anticoagulation in atrial fibrillation Warfarin Bleeding Risk - Elderly Estimate 90 day risk of bleeding in patients on warfarin who are 65 years. The CHADS 2 risk score is used to determine whether anticoagulation or antiplatelet therapy is indicated in patients at risk for thrombotic complications of atrial fibrillation (AF). The study from Hokuriku (Japan) also noted that a positive correlation between CHADS 2 score and warfarin prescription found for younger patients somehow disappeared for the population 80 years of age. The CHADS 2 score and its updated version, the CHA 2 DS 2-VASc score, are clinical prediction rules for estimating the risk of stroke in patients with non-rheumatic atrial fibrillation (AF), a common and serious heart arrhythmia associated with thromboembolic stroke. To complement the CHADS2 score, by the inclusion of additional 'stroke risk modifier' risk factors, the CHA2DS2-VASc score was developed (2) The CHA2DS2-VASc Score for for Atrial Fibrillation Stroke Risk calculates stroke risk for patients with atrial fibrillation, possibly better than the CHADS2 score. About This Calculator. Unlike the original CHADS2 score, which was based on a retrospective Medicare registry, CHA 2 DS 2-VASc prospectively included patients from multiple countries who were aged 18 years and older. 4 Patients were both ambulatory and hospitalized, and were followed for a total of 12 months. Whether or not you should be on Coumadin or warfarin is a continuing controversy among those with atrial fibrillation. How do you know your risk of stroke and whether or not you should be taking Coumadin? Your doctor will assess your CHADS2 score to determine whether or not you should be on Coumadin.