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Five studies published between 2009 and 2011 are reviewed that importantly inform stroke prevention for patients with atrial fibrillation (AF) or with cervical carotid artery stenosis. Two large, phase III randomized trials tested novel oral anticoagulants for stroke prevention in patients with AF: the direct thrombin inhibitor dabigatran 150 mg twice daily was superior to adjusted-dose warfarin (RE-LY trial) and the direct factor Xa inhibitor apixaban was far superior to aspirin in patients deemed unsuitable for warfarin (AVERROES trial). For both novel anticoagulants, major bleeding rates were similar to the comparator treatment. Clopidogrel plus aspirin was more efficacious than aspirin alone for prevention of stroke in patients with AF deemed unsuitable for warfarin, but major bleeding was significantly increased with dual antiplatelet therapy (ACTIVE A trial). Two large randomized trials (CREST, ICSS) provide the best available data on the short-term risks of carotid artery stenting vs. endarterectomy. In both trials, periprocedural stroke was more frequent with stenting than with endarterectomy, but the increased risk was largely confined to patients >70 years old. For younger patients, periprocedural risks were comparable with stenting or endarterectomy, but long-term outcomes are required to assess the relative merits of the two procedures.

What’s new in stroke? The top 10 studies of 2009–2011. Part II