Atrial fibrillation patients were almost two times more likely to suffer a stroke in the month after they began taking warfarin compared with those who did not use the blood thinner, according to a study involving more than 70,000 patients in the U.K. The risk of stroke was especially high during the initial week of therapy, but the risk declined after the first 30 days. The findings, published in the European Heart Journal, suggest that providers "should be vigilant when initiating warfarin, particularly in the first week of use," lead researcher Laurent Azoulay said.

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