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Traumatic brain injury contributes to morbidity in children and boys is disproportionately represented. Cerebral autoregulation is impaired after traumatic brain injury, contributing to poor outcome. Cerebral perfusion pressure is often normalized by the use of vasopressors to increase mean arterial pressure. In prior studies, we observed that phenylephrine prevented impairment of autoregulation in female but exacerbated in male piglets after fluid percussion injury. In contrast, dopamine prevented impairment of autoregulation in both sexes after fluid percussion injury, suggesting that pressor choice impacts outcome. The extracellular signal-regulated kinase isoform of mitogen-activated protein kinase produces hemodynamic impairment after fluid percussion injury, but the role of the cytokine interleukin-6 is unknown. We investigated whether norepinephrine sex-dependently protects autoregulation and limits histopathology after fluid percussion injury and the role of extracellular signal-regulated kinase and interleukin-6 in that outcome.

pediatric critical care medicine

Preferential Protection of Cerebral Autoregulation and Reduction of Hippocampal Necrosis With Norepinephrine After Traumatic Brain Injury in Female Piglets*