American Stroke Association meeting reportA new anti-clotting agent is vastly superior to aspirin at reducing stroke risk (1.6 percent per year versus 3.6 percent per year) in atrial fibrillation (AF) patients unable to take stronger drugs, according to final data reported today at the American Stroke Association's International Stroke Conference 2011. Researchers found the drug also works better in people with a history of stroke or a warning stroke. Atrial fibrillation is a heartbeat abnormality that can cause blood clots which raise the risk of stroke, particularly in the elderly. The AVERROES: Apixaban Versus Acetylsalicylic Acid (ASA) to Prevent Strokes...