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The AVERROES (Apixaban, Versus Acetylsalicylic Acid [ASA] to Prevent Stroke in Atrial Fibrillation Patients Who Have Failed or Are Unsuitable for Vitamin K Antagonist Treatment) study, led out of McMaster University in Hamilton, Ontariowas designed to determine the efficacy and safety of apixaban, at a dose of 5 mg twice-daily, as compared with ASA, at a dose of 81 to 324 mg daily, for the treatment of patients with AF for whom vitamin K antagonist (VKA, such as warfarin) was considered unsuitable.The primary objective of the study was to determine whether apixaban 5 mg twice-daily (2.5 mg twice-daily in selected patients) was superior to ASA (81 to 324 mg QD) in the prevention of stroke or systemic embolism. Assessments of superiority of apixaban versus ASA were also pre-specified for major vascular events (composite outcome of stroke, systemic embolism, myocardial infarction or vascular death) and all-cause death.3
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