297 Exploring Risk Factors for Acute Kidney Injury in Patients Undergoing Cardiac Surgery

Acute Kidney Injury (AKI) is an important complication following cardiac surgery that has been associated with adverse outcomes. The aim of this work was to investigate the incidence and risk factors for AKI in patients undergoing cardiac surgery at our centre. This is a retrospective analysis of 1441 patients who underwent elective or urgent (but not emergency) cardiovascular surgery with use of cardiopulmonary bypass over a 1-year period. Our exclusion criteria were heart transplant, single CABG, congenital repairs or patients on dialysis or renal transplant pre-operatively. Data analysis was performed in R studio. The mean age of the patients was 67.7 years. Mean creatinine from a 7-day period before surgery was 90µmol/L compared with the mean peak post operative creatinine of 127 µmol/L (95% CI 33-42, p-value <0.05). As defined by the KDIGO AKI stages, 27% developed an AKI stage 1, 11% developed AKI stage 2 and 1% AKI stage 3. The following variables correlated strongly (P-value <0.001) with post-operative risk of AKI: The comorbidities of diabetes, smoking, and peripheral vascular disease; pre-operative medications: diuretics, calcium channel blockers and SGLT-2 inhibitors and receiving FFP or RBC transfusion postoperatively. AKI is a common complication following cardiac surgery. Having an insight into the risk factors for AKI allows an opportunity for intervention preoperatively and can also highlight patients that may require extra vigilance in the perioperative period to reduce its incidence, which may lead to an improvement in outcomes following surgery.