RT Journal Article SR Electronic A1 Jacobson, Anne T1 Clopidogrel Added to Aspirin Reduces Stroke Risk in Atrial Fibrillation Patients Unsuitable for Vitamin K Antagonist Therapy JF MD Conference Express YR 2009 FD SAGE Publications VO 9 IS 2 SP 23 OP 24 DO 10.1177/155989770902013 UL http://mdc.sagepub.com/content/9/2/23.abstract AB For high-risk atrial fibrillation patients who are unsuitable for Vitamin K antagonist (eg, warfarin) therapy, dual antiplatelet therapy with clopidogrel and aspirin reduces the risk of major vascular events compared with aspirin alone, according to findings from the Atrial Fibrillation Clopidogrel Trial with Irbesartan for Prevention of Vascular Events [ACTIVE]-A trial [NCT000249873].