Heart attack patients who received a transfusion for blood loss or anemia were three times more likely to have another heart attack within the following month than those who did not get a transfusion, according to the results of a recent study.

Theory: A transfusion may trigger an immune response that can exacerbate coronary artery disease.

Self-defense: Before accepting a transfusion, heart patients should ask their doctors whether their blood counts could recover on their own.

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