A study found that cardiac surgery patients who received transfusions of blood that was at least 3 weeks old were at double the risk of postoperative delirium compared with patients who received fresher red blood cells. "The association might have nothing to do with blood age. One possibility is that transfusion, on its own, may be associated with delirium, but that's difficult to separate out because there are so many confounders," Society for the Advancement of Blood Management President Dr. Aryeh Shander said. The results of the 160-patient, case-controlled trial were reported at a meeting of cardiovascular anesthesiologists.

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