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Background: Our aim was to investigate the differences in postoperativehearing thresholds in patients undergoing coronary artery bypass grafting with (Group I, n=20) or without(Group II, n=17) extracorporeal circulation. Material/Methods: 37 patients undergoing coronary arterybypass grafting with or without extracorporeal circulation were prospectively evaluated in terms of hearingthreshold changes with the intention of documenting hearing losses postoperatively. The t-test for twoindependent variables was used for statistical analysis. Results: Hearing threshold changes were detectedin 9 Group I patients (45%) and 3 Group II patients (17.65%). The difference between the two groups wasstatistically significant (p=0.0426). Conclusions: Postoperative hearing threshold changes, not necessarilyrevealed by clinical examinations, are encountered after coronary artery bypass grafting operations.Extracorporeal circulation usage seems to bring an additional risk in terms of hearing loss.