RESUMO
OBJECTIVE: To quantify and examine the relationship between global and regional cerebral blood flow (CBF) and water diffusion on brain magnetic resonance imaging (MRI) in children after cardiac arrest. STUDY DESIGN: Children admitted to a tertiary care children's hospital from July 2011 to April 2013 who received a brain MRI within 2 weeks after cardiac arrest that included arterial spin labeling and apparent diffusion coefficient (ADC) sequences were studied. CBF and ADC values were calculated globally and in 19 regions of interest. Outcome variables included survival and favorable neurologic outcome, which was defined as Pediatric Cerebral Performance Category ≤3 at 6 months. We examined global and regional relationships between CBF and ADC and their association with outcome. RESULTS: This sample included 14 pediatric patients (mean time to MRI 6 ± 4 days), 9 of whom survived and 6 who survived with favorable outcome. Global ADC was significantly decreased in patients with unfavorable outcome (P = .02). Increased CBF and decreased ADC often were colocalized in the same region, especially in children who had unfavorable outcomes. CONCLUSIONS: In this exploratory study, global restricted water diffusion on ADC after pediatric cardiac arrest was associated with unfavorable outcome. MRI assessments of perfusion and diffusion may have prognostic value after pediatric cardiac arrest.