Articles: brain-injuries.
-
There is abundant evidence that after in vivo traumatic brain injury, oxygen radicals contribute to changes in cerebrovascular structure and function; however, the cellular source of these oxygen radicals is not clear. The purpose of these experiments was to use a newly developed in vitro tissue culture model to elucidate the effect of strain, or stretch, on neuronal, glial, and endothelial cells and to determine the effect of the free radical scavenger polyethylene glycol-conjugated superoxide dismutase (PEG-SOD; pegorgotein, Dismutec) on the response of each cell type to trauma. ⋯ These studies further document the utility of the model for studying cell injury and repair and further support the vascular endothelial cell as a site of free radical generation and radical-mediated injury. On the assumption that, like aortic endothelial cells, stretch-injured cerebral endothelial cells also produce oxygen radicals, our results further suggest the endothelial cell as a site of therapeutic action of free radical scavengers after traumatic brain injury.
-
Traumatic brain injury (TBI) causes impairments of both motor and spatial memory performances. Research is only beginning to reveal the biochemical mechanism(s) underlying these deficits. It has been postulated that reactive oxygen species such as the superoxide and hydroxyl radicals, as well as the peroxynitrite anion, are generated by injury and may play a critical role in the observed memory deficits. ⋯ Volumetric analysis of cortical tissue loss showed no significant differences between vehicle- and drug-injected animals. Similarly, histological examination of the hippocampus did not reveal any gross differences between the two groups. These results indicate that deferoxamine improves spatial memory performance, possibly through protection from neuronal dysfunction.
-
Persistent vegetative state (PVS, apallic syndrome) has become a significant medical and social problem. The outcome of young people with PVS is a matter of great interest. Therefore, we analysed the outcome of 127 children and adolescents who were in PVS for at least 30 days following traumatic (n = 82) or hypoxic (n = 45) brain injury. ⋯ Thirteen patients (16%) with TBI became independent in everyday life versus only two (4%) with HBI. These results underline the important contribution of hypoxia in severe and permanent brain impairment. They also may help to establish the prognosis of children in PVS.
-
Isotonic fluids have been thoroughly studied and for the vast majority of neurosurgical patients are both safe and effective. Conversely, HS may have some transient beneficial effects on cerebral physiology in animal models of brain injury. ⋯ Until the risk-benefit ratio of HS is better defined in humans, physicians should exercise caution and adhere to the Hippocratic oath. However, if this risk-benefit ratio is defined, HS may hold promise for the clinical conditions cited herein as well as other novel uses (cardiopulmonary bypass, spinal trauma [55,56]).