 Over time, however, due to technical progress the development of hybrid surgery, new valves and prostheses, the development of new drugs, changes in the environment and social conditions in which do patients live, there is a need to improve old and develop new models. Based on the statement that high risk patients have similar characteristics clinical and laboratory regardless of the procedure to which they were submitted, creating a new risk score to this group of patients must be sought. Improving the model quality was achieved by using more accurate risk assessments. In general, the assessment of mortality risk in cardiac surgery is performed with the use of preoperative risk models EuroSCORE II, STS-score. However, the use of improved risk models and increased accuracy in the technique of preparing these mathematical systems, unfortunately, does not have a positive impact on the level of prediction, which is still inaccurate, especially in the considered group of high risk. New models need to be built not only for a better prediction of mortality risk, if not also to predict morbidity in the group of patients at higher risk of complications after cardiac surgery procedures. 