Abstract
This study evaluated the performance of the pediatric RIFLE (pRIFLE) score for acute kidney injury (AKI) diagnosis and prognosis after pediatric cardiac surgery. It was a single-center prospective observational study developed in a pediatric cardiac intensive care unit (pCICU) of a tertiary children's hospital. The study enrolled 160 consecutive children younger than 1 year with congenital heart diseases and undergoing cardiac surgery with cardiopulmonary bypass. Of the 160 children, 50 (31 %) were neonates, and 20 (12 %) had a univentricular heart. Palliative surgery was performed for 53 patients (33 %). A diagnosis of AKI was determined for 90 patients (56 %), and 68 (42 %) of these patients achieved an "R" level of AKI severity, 17 patients (10 %) an "I" level, and 5 patients (3 %) an "F" level. Longer cross-clamp times (p = 0.045), a higher inotropic score (p = 0.02), and a higher Risk-Adjusted Classification for Congenital Heart Surgery score (p = 0.048) but not age (p = 0.27) correlated significantly with pRIFLE class severity. Patients classified with a higher pRIFLE score required a greater number of mechanical ventilation days (p = 0.03) and a longer pCICU stay (p = 0.045). Renal replacement therapy (RRT) was needed for 13 patients (8.1 %), with two patients receiving continuous hemofiltration, and 11 patients receiving peritoneal dialysis. At the start of dialysis, the distribution of RRT patients differed significantly within pRIFLE classes (p = 0.015). All deceased patients were classified as pRIFLE "I" or "F" (p = 0.0001). The findings showed that pRIFLE is easily and feasibly applied for pediatric patients with congenital heart disease. The pRIFLE classification showed that AKI incidence in pediatric cardiac surgery infants is high and associated with poorer outcomes.
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