Perioperative measurement of urinary oxygen tension as a tool in the prevention of acute kidney injury

Acute kidney injury (AKI) remains a common complication after cardiopulmonary bypass (CPB) and can be diagnosed by serum creatinine [1]. However, serum creatinine is an insensitive and nonspecific biomarker [2]. This study was designed to investigate whether a correlation exists between urinary oxygen tension (UOT) and early markers of AKI. The aim was to evaluate whether UOT could provide warning signs of an insufficient renal oxygen supply, which can lead to postoperative AKI.