Anticoagulant Use, by Stroke Risk and Age Based on the CHADS scoring system, the rates of anticoagulant use in patients with AF were found to berelatively low, even in patients deemed to be at a high risk for stroke. Overall, based on claims data, only 39% ofpatients in the high-risk category received an anticoagulant.However,rates varied by age-group, with
16%,22%,and 61% of patients aged