Cardiac surgery-associated acute kidney injury (CSA-AKI) is the most prevalent clinically significant complication in adult patients undergoing open heart surgery, closely linked to increased mortality and morbidity. Among intensive care unit (ICU) patients, CSA-AKI is the second most common type of acute kidney injury, surpassed only by sepsis-induced AKI. The Doppler-based Renal Resistive Index (RRI) measurement is a rapid and noninvasive diagnostic tool with potential for the early detection of acute kidney injury in intensive care unit patients and could also be useful as an early predictor of acute kidney injury (AKI) in the context of cardiac surgery, particularly when used in conjunction with novel biomarkers.
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