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Preoperative renal insufficiency is an important predictor of mortality after cardiac surgery and the association between small serum creatinine (SCr) changes within 48 hours after cardiac surgery and mortality has been demonstrated. ([1]) Further it has been shown recently that a preoperative elevated SCr is a predictor for worse outcome after cardiac surgery too. ([2])

Minimal changes of serum creatinine in the early postoperative period predict prognosis in patients after cardiac surgery