A million Americans who have had heart attacks or strokes caused by blood clots now take anti-clotting drugs regularly to cut down the danger of recurrences. But their blood takes so much longer to clot that dental and other surgeons are confronted with a dilemma: Should they keep a patient on the anticoagulant drug during an operation and run the risk of severe (perhaps fatal) bleeding, or should they take him off the drug for a few days and run the risk of clotting in an artery of the heart or brain? Such authorities as the New England Journal of Medicine...
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