Cardiac surgery is one of the most common surgical procedures performed worldwide. 1 Technological advances and protocolized perioperative patient care have resulted in major improvements in clinical outcomes, including mortality. Despite these improvements, multiple postoperative complications, including atrial fibrillation, myocardial infarction, and stroke, remain common after cardiac surgery, and are associated with significant morbidity and mortality. 2 Acute kidney injury (AKI) is a common and often devastating complication of cardiac surgery. The reported incidence of cardiac surgery-associated AKI (CS-AKI) depends on the characteristics of the patient population, as well as on the definition used for Conflict of Interest: None declared.