This study investigates the relationship between intraoperative ultrafiltration (UF) volume during cardiopulmonary bypass (CPB) and the incidence of acute kidney injury (AKI) post-coronary artery bypass graft (CABG) surgery. Analyzing data from 641 patients, it found that higher UF volumes are significantly associated with an increased risk of AKI. Other identified predictors of AKI include patient age, the lowest mean arterial pressure during surgery, and red blood cell transfusions. These results underscore the importance of careful UF management during CPB to mitigate the risk of postoperative AKI.