 It was decided to conduct this research in two phases. The developmental phase is carried out for 30 months and includes an analysis of at least 2,000 patients who will pass cardiac surgery procedures in institutions and hospitals involved in the study. After this analysis, including outcomes, will be constructed the HiriSCORE, a new test-model for high-risk patients. In the validation phase of the study, which will involve a further 1,000 patients it is planned preparation and verification of effectiveness of the HiriSCORE model where it will be compared to the STS Score and the EuroSCORE II. 