Predictive Nomogram for Postoperative Acute Kidney Injury (AKI) in Elderly Patients Following Liver Resection

The occurrence of postoperative AKI is independently associated with increased morbidity and mortality. Advanced age reduces renal autoregulatory capacity due to physiological and functional changes, thus render the elderly to suffer postoperative AKI and probably the consequent chronic kidney disease. Although elderly patients account for approximately 25% of surgical procedures, the incidence and associations of AKI in this group of patients are rarely understood. Thus, it is essential to identify those patients at high risk to develop postoperative AKI to optimize perioperative prevention and protection strategies. This study is a retrospective cohort study, aim to access risk factors of postoperative AKI and its association with outcomes. The investigators will develop and validate a predictive model for postoperative AKI. The principal clinical outcome of the study is postoperative AKI, defined as an absolute increase in serum creatinine of 0.3 mg/dL within 48 hours or a 1.5-fold increase from preoperative baseline within seven days after surgery, according to the Kidney Disease: Improving Global Outcomes (KDIGO) criterion.