GSTM1 and acute myocardial infarction: Analyzing the 45 RCTs with adult participants selected by the authors—8concerning cardiac surgery, 8 critical care, and 3 acute myocardial infarction(MI)—the authors agreed that the most common liberal Hb transfusion thresholdwas 9 to 10 g/dL, and the most common restrictive threshold was 7 to 8 g/dL.