O conhecimento dos mecanismos fisiopatológicos da lesão cerebral no traumatismo .. O edema cerebral vasogênico resulta de distúrbio na barreira. Advancements in molecular biology have led to a greater understanding of the individual proteins responsible for generating cerebral edema. In large part, the. AJR Am J Roentgenol. Sep;(3):W doi: /AJR Cerebral edema. Ho ML(1), Rojas R, Eisenberg RL. Author information.
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Prog Neurobiol ; Neurol Res ; The concept that only the cereebral forces influence ionic edema, while both osmotic and hydrostatic gradients influence vasogenic edema may help to explain the mixed outcomes that occur following decompressive craniectomy, a procedure that abruptly lowers intraparenchymal pressure.
Cancer Cell ; Intravenous HOE reduces brain edema and Na uptake in the rat permanent middle cerebral artery occlusion model of stroke: Involvement of the glucocorticoid receptor and vascular permeability factor”. Sevenfold-reduced osmotic water permeability in primary astrocyte cultures from AQPdeficient mice, measured by a fluorescence quenching method.
Relationship to intracranial hypertension. The role of hydrostatic pressure in ischemic brain edema. Effects of gene knockout and enzyme inhibition with BB Major routes for influx of ions and water in ionic edema.
Pathophysiology of traumatic brain edema: Advancements in molecular biology have led to a greater understanding of the individual proteins responsible for generating cerebral edema. The recent description of the glymphatic system led to the formulation of a second hypothesis, whereby CSF serves as the immediate source of ions and water. Extracellular glutamate during focal cerebral ischaemia in rats: J Cereb Blood Flow Metab.
Cerebral edema is a cerebrak clinical problem. Many studies of the mechanical properties of brain edema were conducted in the s, most of them based on finite element analysis FEAa widely used numerical method in solid mechanics. Views Read Edit View history. Effects of lactacidosis on glial cell volume and viability.
Rather, the cerebrl abundant glucose transporters, sodium-glucose linked transporter 1 SGLT1 and glucose transporter 1 GLUT1 might represent a major route for transendothelial water flux, as they have the ability to passively transport water independently of glucose, analogously to aquaporin channels. In the interstitium, hemoglobin is quickly oxidized to methemoglobin; the latter can spontaneously release its heme moiety, which may be further degraded by heme oxygenase enzymes to free iron.
Sodium-hydrogen exchangers and sodium-bicarbonate co-transporters: The neurovascular unit The BBB is not a static barrier, but rather it dynamically alters its properties in response to neuronal activity.
Tumor necrosis factor alpha antagonism improves neurological recovery in murine intracerebral hemorrhage. Neurons are fragile cells and ecema survive without the support of other cell types.
Oxford University Press,pp. Eur J Pharmacol ; Monocyte chemoattractant protein-1 alters expression of tight junction-associated proteins in brain microvascular endothelial cells. This creates an abnormal pressure gradient and movement of water into the brain, which can cause progressive cerebral edema, resulting in a spectrum of signs and cerebrall from headache and ataxia to seizures and coma.
Neurochem Int ; However, a significant portion of CSF might be cleared through the cervical lymphatics, either through the perineuronal subarachnoid spaces that surround cranial nerves or by passage through the olfactory submucosa.
O presente estudo visa identificar alguns fatores associados ao desenvolvimento de edema perilesional em pacientes com meningiomas intracranianos operados no HUCFF. J Neurol Sci ; Unlike hemorrhage, capillary structural integrity is maintained during vasogenic edema such that passage of erythrocytes is prohibited.
Neuropathology of the head injuries. Schematic depiction cetebral the major endothelial transporters and channels that have been implicated in the formation of ionic edema; in regards to water transport, single-headed arrows denote water co-transport, while double-headed arrows denote passive water transport.
Nevertheless, cytotoxic edema is an important initial step in the formation of cerebral edema and swelling, as it generates the driving force for influx of ionic and vasogenic edema, which do cause swelling.
Mechanisms of cerebral edema in traumatic brain injury: Intracellular sodium homeostasis in rat cerebrral astrocytes.
Yang B, Verkman AS. Distribution of enzymes between the luminal and antiluminal membranes of brain capillary endothelial cells.
Swelling refers to a volumetric expansion of a given mass of sdema and can be generated by the accumulation of tumor, edema, or blood, although here, the focus is on edema. Metabotropic glutamate receptor subtypes as targets for neuroprotective drugs. Cornford EM, Hyman S.
Dynamic volume changes in astrocytes are an intrinsic phenomenon mediated by bicarbonate ion flux. Extracellular potassium in a neocortical core area after transient focal ischemia.
Most changes in morphology are associated with cerebral edema: Neurocrit Care ; For cerebral edema and swelling to occur, the brain tissue vasogneico be perfused by an external fluid source.
Correlation of the relationships of brain-tumor interfaces, magnetic resonance imaging, and angiographic findings to predict cleavage of meningiomas. Adv Tech Stand Neurosurg ; Pathol Res Pract ; Persistent protease-activated receptor edeja signaling mediates thrombin-induced microglial activation.
Recebido 22 Fevereirorecebido na forma final 12 Abril Timing and indication of decompressive surgery for malignant cerebral infarction. Therefore, in addition to direct neuroprotection, a new goal for acute brain injury research is to investigate and attenuate mechanisms of endothelial, vasogenkco, and microglial dysfunction and, thereby, create an environment permissible to neuronal survival.