Risk factos Preoperative factors: age, heart failure, basal renal function, anemia, diabetes, COPD, emergency, nephrotoxic drugs, contrast agents, genetic... Intraoperative factors: renal hypoperfusion, type of surgery, cadiopulmonary bypass use (hemodilution, hypothermia, non-pulsatile flow, inflammation, nephrotoxins, embolism). Postoperative factors: low cardiac output, IABP, vasoactive agents, nephrotoxic drugs, volume depletion, sepsis... 1.4.2.