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Calculate CHA2DS2-VASc stroke risk score, annual ischemic thromboembolism percentage, and oral anticoagulation (DOAC) guidelines in non-valvular atrial fibrillation.
Frequently Asked Questions
What is the CHA2DS2-VASc score used for?
The CHA2DS2-VASc score stratifies the annual risk of ischemic stroke and systemic thromboembolism in adult patients with non-valvular Atrial Fibrillation (AFib), guiding clinical decisions on whether to prescribe oral anticoagulation.
What score threshold indicates the need for anticoagulation?
AHA/ACC and ESC clinical practice guidelines strongly recommend oral anticoagulants for men with a score >= 2 and women with a score >= 3. For men with a score of 1 and women with a score of 2, oral anticoagulation may be considered.
Why are Direct Oral Anticoagulants (DOACs) preferred over Warfarin?
DOACs (such as Apixaban/Eliquis and Rivaroxaban/Xarelto) are preferred over Warfarin (Coumadin) because they do not require routine INR blood monitoring, have fewer food/drug interactions, and significantly reduce the risk of fatal intracranial hemorrhage.
Why does female sex alone not warrant anticoagulation?
Female sex is a stroke risk modifier rather than an independent risk factor; a female patient under 65 with AFib and no other risk factors has a score of 1 but does not require anticoagulation.