Cardiac surgery associated acute kidney injury (CSA-AKI) is one of the most frequent and severe complications after cardiac surgery. The association between acute kidney injury and the mismatch between oxygen consumption and delivery has been well established during cardiopulmonary bypass (CPB) and contributes to the development of CSA-AKI. In this study, the investigators aim to explore the use of gap CO2 during cardiac surgery and its relation with CSA-AKI. In order to explore this association, the invetigators built a retrospective, multicentric study. All patient who underwent cardiac surgery with cardiopulmonary bypass in two French ICU between 03/2019 and 04/2023 and for which information about gap CO2 during CPB is available will be included. After inclusion, patient will be divided in two groups according to the presence or absence of an elevated gap CO2. Occurence of CSA-AKI and other outcomes will be compared between groups, using multivariate analysis.
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Acute Kidney Injury
Timeframe: within the 7 days after surgery