The Relationship Between Postoperative Drainage Volume and the Incidence of Postoperative Renal Injury in Infants Undergoing Cardiac Surgery

Abstract

Cardiac surgery-related acute kidney injury (CS-AKI) is a serious and frequently encountered complication that occurs in children undergoing cardiac surgery. It is particularly prevalent among those who undergo complex and prolonged surgical procedures. CS-AKI is a complex condition that can lead to significant morbidity and even mortality, and thus, understanding its pathogenesis and identifying potential risk factors is crucial for improving patient outcomes. One of the most consistent contributing factors to the development of CS-AKI is intraoperative bleeding. Bleeding during surgery can lead to hemodynamic instability, which in turn can affect renal perfusion and oxygen supply, ultimately leading to kidney injury. Intraoperative renal hypoperfusion and oxygen supply and demand imbalances are recognized as important pathogenic mechanisms underlying CS-AKI. To further investigate the relationship between intraoperative bleeding and postoperative kidney damage, researchers have conducted prospective observational studies. These studies focus on infants and young children undergoing cardiac surgery, as they are particularly vulnerable to the complications of such surgeries. By carefully observing and documenting the postoperative drainage volume, researchers aim to evaluate the correlation between postoperative blood loss and the incidence of postoperative renal injury. The results of these studies have provided valuable insights into the pathophysiology of CS-AKI. However, it is important to note that the correlation between postoperative eCrCl (estimated creatinine clearance) and postoperative drainage volume has not been found to be significant. This suggests that while intraoperative bleeding may contribute to the development of kidney injury, it may not be the sole determinant of renal outcome.