“…A large number of studies have shown that perioperative transfusion of allogeneic blood is associated with increased morbidity and mortality. Poorer outcomes are ascribed to an increased risk of postoperative infection, 3-10 pulmonary complications, 8,11 greater number of ventilator days, 9,12 renal dysfunction requiring dialysis, 9 multi-organ dysfunction, 13 intensive care unit days, 10 increased length of stay, 14 and short-term mortality. 9,10 Risk-adjusted models have attempted to control for allogeneic transfusion as simply a marker for illness severity or complicated perioperative course.…”