P7: ACUTE KIDNEY INJURY AFTER ELECTIVE COLORECTAL SURGERY: RESULTS OF A NATIONAL CLOSED-LOOP AUDIT

The aim of this study was to re-audit the rates of acute kidney injury (AKI) after elective colorectal surgery, following local presentations of results. Method Outcomes After Kidney injury in Surgery (OAKS) and Ileus Management International (IMAGINE), were prospective multicentre audits on consecutive elective colorectal resections, in the UK and Ireland. These were performed over 3-month periods in 2015 and 2018 respectively. During the interim period, results were presented at participating centres to stimulate local quality improvement initiatives. Risk-adjusted 7-day postoperative AKI rates were calculated through multilevel logistic regression based on the OAKS prognostic score. Result Of the 4,917 patients included, 3,133 (63.7%) originated from OAKS and 1,784 (36.3%) from IMAGINE. On univariate analysis, there was no significant difference (p=0.737) in the 7-day AKI rate between OAKS (n=346, 11.8%) and IMAGINE (n=205, 11.5%). However, the risk-adjusted AKI rate in IMAGINE was significantly lower compared to OAKS (-1.8%, 95% CI: -2.3% to -1.3%, p<0.001). Of 47 centres (40.1%) with a recorded local presentation, there was no significant difference in the subsequent AKI rate in IMAGINE (-0.7%, -2.0% to 0.6%, p=0.278). Conclusion Rates of AKI after elective colorectal surgery significantly reduced on re-audit. However, this may be related to increased awareness from participation or national quality improvement initiatives, rather than local presentation of results. Abbrev. AKI - Acute Kidney Injury, OAKS - Outcomes After Kidney injury in Surgery, IMAGINE - Ileus Management International Take-home message Risk-adjusted AKI rates significantly reduced on re-audit, however, this was most likely due to factors separate from the local presentation of initial results.