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Cardiac surgery is associated with a high rate of allogeneic blood transfusion (BT), varying from 40% to 90% in most centres. However, BT may be both beneficial and harmful. Severe anaemia is an independent risk factor for cardiac surgery morbidity and mortality, but BT substantially increases costs and is associated with adverse outcomes, including increased rates of infections, neurologic complications, renal failure and decreased in-hospital and long-term survival after cardiac operations. The decision for transfusion is often based on haemoglobin or haematocrit levels, but there are no evidence-based guidelines on transfusion triggers after cardiac surgery.1
A prospective, randomised, non-inferiority controlled trial was conducted at the Heart Institute of the University of Sao Paulo, Sao Paulo, Brazil, between February …
Competing interests None.