Objectives: This study is designed to determine the feasibility and utility of vascular occlusion test variables as measured by INVOS (Medtronic, Dublin, Ireland) in pediatric cardiac patients. Design: A prospective observational study. Setting: A tertiary children’s hospital. Patients: Children less than or equal to 8 years old who were scheduled for elective cardiac surgery under cardiopulmonary bypass. Interventions: A vascular occlusion test (3 min of ischemia and reperfusion) was performed on the calf at three time points: after induction of anesthesia (T0), during cardiopulmonary bypass (T1), and after sternal closure (T2). Measurements and Main Results: Baseline regional tissue hemoglobin oxygen saturation, deoxygenation rate, minimum regional tissue hemoglobin oxygen saturation, and reoxygenation rate were measured using INVOS. Influence of age on variables at each measurement point was also checked using linear regression analysis. Receiver operating characteristics curve analysis was performed to determine the ability of vascular occlusion test variables at T2 to predict the occurrence of major adverse events. Both the deoxygenation and reoxygenation rates were lowest in T1. There was a tendency to decreased regional tissue hemoglobin oxygen saturation in younger patients at T0 (r = 0.37; p
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