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tungsten/hemorràgia
L'enllaç es desa al porta-retalls
Pàgina 1 des de 29 resultats
Experimental subarachnoid hemorrhage in rats: comparison of two endovascular perforation techniques with respect to success rate, confounding pathologies and early hippocampal tissue lesion pattern.
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Recently aside from the "classic" endovascular monofilament perforation technique to induce experimental subarachnoid hemorrhage (SAH) a modification using a tungsten wire advanced through a guide tube has been described. We aim to assess both techniques for their success rate (induction of SAH
Mechanisms of lung neutrophil activation after hemorrhage or endotoxemia: roles of reactive oxygen intermediates, NF-kappa B, and cyclic AMP response element binding protein.
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Acute inflammatory lung injury occurs frequently in the setting of severe infection or blood loss. Accumulation of activated neutrophils in the lungs and increased pulmonary proinflammatory cytokine levels are major characteristics of acute lung injury. In the present experiments, we examined
Xanthine oxidase-derived oxygen radicals increase lung cytokine expression in mice subjected to hemorrhagic shock.
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Acute inflammatory lung injury often complicates hemorrhagic shock, a systemic ischemia-reperfusion syndrome. Because oxygen radicals are generated during ischemia-reperfusion, and oxygen radicals can activate nuclear regulatory factors that affect transcription of proinflammatory cytokines, we
Hemorrhage induces rapid in vivo activation of CREB and NF-kappaB in murine intraparenchymal lung mononuclear cells.
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Increased expression of proinflammatory cytokines appears to be an important factor contributing to the development of acute lung injury. In murine models, mRNA levels of proinflammatory and immunoregulatory cytokines, including IL-1alpha, IL-1beta, TGF-beta1, and TNF-alpha, are increased in
Hemorrhage activates NF-kappa B in murine lung mononuclear cells in vivo.
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Hemorrhage rapidly increases the expression of proinflammatory and immunoregulatory cytokines in the lungs. Binding elements for the nuclear transcriptional regulatory factors (NF)-kappa B and NF-IL6 (C/EBP beta) are present in the promoter regions of multiple cytokine genes, including those whose
Hemorrhagic shock-induced bacterial translocation is reduced by xanthine oxidase inhibition or inactivation.
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Experiments were performed to determine whether bacterial translocation (BT) after hemorrhagic shock is due to a reperfusion injury mediated by xanthine oxidase-derived oxidants. Rats were subjected to 30 minutes of shock (30 mm Hg) followed by reinfusion of shed blood. Twenty-four hours after
Comparison between tungsten and steel polypectomy snares: evaluation of depth of colonic thermal wall injury in a pig model.
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OBJECTIVE
Thermal injury of the colonic wall during polypectomy may induce complications such as bleeding and perforation. To date, the role of the snare material in these injuries has not been examined. The aim of this study was to evaluate the depth of colonic post-polypectomy thermal wall injury
Effects of cemented tungsten carbide dust on rat lungs following intratracheal injection of saline suspension.
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In order to examine the effect of cemented tungsten carbide dust on the animal lung, saline suspensions were intratracheally administered into the lungs of rats in a single dosage. About one-fifth of the animals died during the first three days. The acute response of the lungs was hemorrhagic edema
Immunization with cDNA of a novel P-III type metalloproteinase from the rattlesnake Crotalus durissus durissus elicits antibodies which neutralize 69% of the hemorrhage induced by the whole venom.
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Zinc-dependent metalloproteinases play a key role in the hemorrhage induced by viperid bite envenoming. In this work we report the cloning and sequencing of the cDNA from a novel P-III type metalloproteinase from Crotalus durissus durissus venom glands. The recombinant plasmid was used for DNA
Neutralization of venom-induced hemorrhage by equine antibodies raised by immunization with a plasmid encoding a novel P-II metalloproteinase from the lancehead pitviper Bothrops asper.
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In this work, the cDNA encoding a novel P-II type metalloproteinase from Bothrops asper venom glands was cloned, sequenced and used for DNA immunization of animals with accelerated DNA-coated tungsten microparticles and the helius Gene Gun system. Specific antibodies against B. asper venom antigens
Subarachnoid hemorrhage model in the rat: modification of the endovascular filament model.
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The present study describes modifications to the endovascular filament model of subarachnoid hemorrhage (SAH) in rats. Specifically, we sought to improve the percentage yield of SAH, reduce mortality rates and better simulate human cerebral aneurysmal rupture. Instead of using a 4-0 prolene suture
Comprehensive characterization and failure modes of tungsten microwire arrays in chronic neural implants.
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For nearly 55 years, tungsten microwires have been widely used in neurophysiological experiments in animal models to chronically record neuronal activity. While tungsten microwires initially provide stable recordings, their inability to reliably record high-quality neural signals for tens of years
Characteristics of sustained blood-brain barrier opening and tissue injury in a model for focal trauma in the rat.
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Minor stab wounding of rodent brain by needle or razor blade is a standard model for immunohistochemical investigations of secondary neuronal degeneration and scarring. Opening of the blood-brain barrier (BBB) to plasma molecules and inflammatory cells is integral to the secondary injury process. To
[Treatment of intracranial aneurysm in interventional neuroradiology. What problems for the anesthetist?].
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OBJECTIVE
To outline the most occurring complications during endovascular treatment of intracranial aneurysms.
METHODS
Retrospective review of thirty-four patients treated from October 1994 to February 1996 with the placement of mechanically detachable microcoils inside the aneurysmal
[Pathology of cardiac lesions induced by radiofrequency ablation in an experimental model].
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Radiofrequency catheter ablation is increasingly being used for the treatment of several tachyarrhythmias. The main aim of this paper is to describe the lesional pathology produced by this type of current. Fourteen Wistar rats (mean weight 300 g) were subjected to discharges of a 700 KHz, pure,
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