The central nervous system cytokine response to global ischemia following resuscitation from ventricular fibrillation in a porcine model

SummaryAim of the StudyPro-inflammatory cytokines have been implicated as culprits in neurotoxicity following ischemia in small animal models of stroke. The aim of this study was to measure the central nervous system (CNS) cytokine response following resuscitation from ventricular fibrillation (VF) in a porcine model of cardiac arrest and global hypoxic ischemia.MethodsVF was induced electrically in 11 anesthetized swine. Following 7 min of untreated VF, animals were resuscitated. Cerebrospinal fluid (CSF) and serum was sampled prior to VF and at 60, 120, and 180 min post-resuscitation from which levels of TNF-α, IL-1β, and IL-6 were measured. Levels were also drawn in three sham pigs, instrumented but not fibrillated.ResultsCSF levels of TNF-α rose following resuscitation and were associated with CSF levels of IL-1β (p = 0.0002). CSF levels of all cytokines except TNF-α were associated with their serum counterparts.ConclusionsMeasurable increases in pro-inflammatory cytokines in the CSF follow resuscitation from cardiac arrest in this porcine model. The CNS response TNF-α and IL-1β are associated. However, serum levels of TNF-α did not seem to predict CSF levels in this study, consistent with the concept of immune privilege of the CNS.