Prospective observational study was conducted to determine predictors of the survival and to construct a prognostic scoring system for critical surgical patients. Predictors of the mortality were low abdominal perfusion pressure, positive fluid balance, lock of bowel movements, high values of APACHE II and failed enteral nutrition. Optimal combination of the predictors was determined by analysis of receiver operating characteristics curves (ROC curves). The combination of IAP, fluid balance and SOFA score had maximal AUC. The combination was called if SOFA score. Its AUC was 0.915. ifSOFA = 5 was the best cut off value.