Renal Oxygen Saturation as an Early Indicator of Shock in Children.

BACKGROUND: Shock is a life-threatening syndrome in which tissue perfusion and oxygen delivery are inadequate. Near-infrared spectroscopy (NIRS) has been suggested as a noninvasive tool for monitoring and detecting the state of inadequate tissue perfusion. Renal and mesenteric oximetry show decreased cardiac output earlier than systemic or global parameters of tissue oxygenation or cerebral oximetry. However, until now there has been no study on the validity of regional renal oxygen saturation (rRSO(2)) by NIRS for diagnosing shock in children. PURPOSE: To analyze the validity of rRSO(2) by NIRS to diagnose shock in children. PATIENTS AND METHODS: This cross-sectional study was conducted in critically ill children (aged 1 month-18 years) who were admitted to the pediatric intensive care unit (PICU), from September to November 2020, consecutively. Patients were classified into two groups: shock and non-shock. The diagnosis of shock is based on clinical criteria (tachycardia, sign of hypoperfusion and decrease systolic blood pressure