Objective. To introduce rapid STOP and STOP-BANG "screening" tests in everyday preoperative preparation elective cardiac patients, and calculate the possible incidence of OSA in this subgroup of patients. Design. A retrospective prognostic study. Settings. The study was conducted at the Intensive Care Unit of cardiac patients, the Department of Anesthesiology and Intensive Care, University Hospital Split. Patients and methods. Elective cardiac patients (n=34) were tested preoperatively in OSA using STOP and STOP-BANG questionnaire. We determined the proportion of patients with a positive test for OSA ( STOP≥2, STOP-BANG≥3), as well as differences in the incidence of perioperative complications, comorbidity, use of vasoactive drugs and the duration of stay in ICU patients between positive and negative on preoperative testing. Comparison of continuous variables was carried out using Student's t-test. Comparison of categorical variables was carried out using the χ2-test. P <0.05 was considered statistically significant. Results. Using the STOP and STOP-BANG questionnaire in elective cardiac patients we found a high incidence of STOP (38.2%) and STOP-BANG positive patients (67.6%). However, these patients did not have a statistically significant differences in perioperative outcomes and complications, comorbidity, use of vasoactive drugs and duration of treatment compared to those patients who have no suspicion of OSA (STOP and STOP-BANG negative) (P>0.05). In the STOP-BANG negative group of patients there is marginally increased need for norepinephrine in relation to the STOP-BANG positive group (p=0.065). In the group of STOP-BANG positive patients there was a significantly higher BMI (p=0.014) and a higher ratio of men/women (χ2=4.948, p=0.026) compared to the STOP-BANG negative group. Additional analysis of data from the newly installed "cut-off" value for the STOP-BANG≥5 showed no statistically significant differences in all observed parameters. Conclusion. STOP and STOP-BANG questionnaire are generally accepted and reliable tests in the preoperative general surgical patients, but with unproven value in cardiac patients. The results of this study suggest the necessary critical assessment of their use in cardiac patients, mostly because of overcoming male, elderly (age>50), hypertensive and obese (BMI>35) patients, making these tests lose value. It would therefore be necessary to introduce a new questionnaire that would be more appropriate to cardiac patient population or set significantly higher limits of positivity to STOP and STOP-BANG questionnaire.