This study shows that intraoperative monitoring of near-infrared spectroscopy (NIRS) values and monitoring of critical thresholds may be an important tool in predicting the development of acute renal failure (ARF) and other postoperative complications.

NIRS values used to monitor tissue oxygenation in the intraoperative period play a critical role in preserving renal function, especially in high-risk surgical procedures such as open-heart surgery.

Furthermore, the low NIRS levels and prolonged desaturation durations seen in Group 2 show a strong association with the development of ARF.

Continuous NIRS monitoring during the intraoperative period may help in the early detection and prevention of serious complications such as ARF. Taking measures to improve perfusion, especially when NIRS decreases by more than 20%, may reduce the risk of ARF.

Careful monitoring of times below the critical thresholds of 80%, 70%, and 60% may help early detection of renal perfusion disorders.

The surgical team can preserve renal function by providing more aggressive fluid therapy and hemodynamic support in patients exceeding these thresholds.

Patients who develop ARF should be monitored more closely in the postoperative period due to the risk of prolonged ICU stay and complications.

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