Age, female gender, congestive heart failure, low LVEF, hypertension, atherosclerosis, diabetes, preoperative Hb value, redo or complex surgery, and emergency procedures were found to be risk factors for hyperlactatemia by Demers and coworkers [20], who reported an hyperlactatemia incidence of 18%. This evidence concerns the gene GSTM1 and congestive heart failure.