 Therefore, this observational retrospective cohort study aims to compare the outcomes of patients undergoing intensive monitoring of renal function UO andor sCr with those of patients undergoing less intensive monitoring. Outcomes will include mortality within 30 days of ICU admission among critically ill patients with and without AKI. Development of severe AKI within 7 days of ICU admission and fluid overload on any ICU day in patients who develop severe AKI KDIGO stage 3 will also be assessed. 