| http://www.w3.org/ns/prov#value | - WEDNESDAY, Aug. 10 (HealthDay News) -- A new drug that lowers stroke risk among people with an irregular heartbeat may give the old standby, warfarin, some competition, a new study shows.Individuals with an erratic heartbeat known as atrial fibrillation are at increased risk for ischemic stroke, which is caused by a blockage such as a blood clot.
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