An injection of the blood thinner enoxaparin is typically given to heart attack patients in the emergency room to help prevent a clot from blocking the blood flow in the coronary arteries, but it can trigger internal bleeding—a fatal complication.
New finding: Fondaparinux (Arixtra), a blood thinner also given by injection, is equally effective at dissolving a blood clot or preventing one from forming, but with about half the risk for internal bleeding.
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