Urine output is often considered a critical target in patients undergoing surgery and is the primary trigger for fluid boluses. Low urine output and oliguria meeting criteria for acute kidney injury (AKI) have been associated with complications including increased length of hospital stay, costs, and mortality.1,2 

The scope of this review is to discuss the determinants and consequences of perioperative oliguria and guide physicians’ decision-making from the operating room to the intensive care unit (ICU) or the ward on how to manage oliguria in surgical patients. We will discuss the factors regulating urine output, propose a pragmatic approach to oliguria management during and after surgery, and describe how a search for perioperative complications (e.g., sepsis, bleeding, pulmonary embolism, tamponade) should be considered a priority when facing a patient with persistent postoperative oliguria.1–7 

The definition of AKI based on Kidney Disease Improving Global Outcomes (KDIGO)...

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