Effect of an Intervention to Prevent Acute Kidney Injury Versus Standard Care in High-risk Patients After Major Surgery

All patients will receive standard of care therapy according to the standards of our center. After identifying surgical patients with a moderate or severe (stage 2 or 3) AKI patients will be randomly allocated to the control or intervention group according to the CCL14 results which will be measured as part of the study. According to the literature, patients with a CCL14 \<1.3ng/ml are at low risk of progression and patients with a CCL14≥1.3ng/ml are at high risk of AKI progression. In order to have both patient groups included, we will have two groups (patients at low and at high risk of AKI progression) and these will be randomized to receive either standard of care or an extended KDIGO bundle (in total 4 groups). Control intervention / reference test: Patients in the control groups will be treated according to the standard of care. The only two hemodynamic targets in this group are the mean arterial pressure (mean arterial pressure (MAP)\>65mmHg) and passive leg raising test (PLRT) (increase of cardiac output (CO) \<10%). In the intervention groups, an extended KDIGO guideline bundle will be implemented (Discontinuation of all nephrotoxic agents when possible, optimization of volume status and perfusion pressure, consideration of a functional hemodynamic monitoring, close monitoring of serum creatinine and urine output, avoidance of hyperglycemia, consideration of alternatives to radio contrast agents, non-invasive or invasive diagnostic workup, nephrology consultation)