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Search Results: 1 - 10 of 325256 matches for " MAZER SéRGIO "
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Análises visual e volumétrica por ressonancia magnética das forma??es hipocampais em um grupo de pacientes com diagnóstico clínico de epilepsia do lobo temporal
Arquivos de Neuro-Psiquiatria , 1998, DOI: 10.1590/S0004-282X1998000300011
Abstract: the purpose of this study is to test the sensitivity of the volumetric analysis compared to the visual analysis of the hippocampal formations of a group of 153 patients with clinical diagnosis of temporal lobe epilepsy and candidates to temporal lobectomy, evaluated by magnetic resonance (mr), using a 0.5 tesla machine and inversion-recovery t1-weighted images and 5 mm coronal slices. there was agreement between the prospective visual analysis and another retrospective visual analysis carried out by two independent observers (c=0.748 and c=0.720). there was also agreement between the retrospective analysis of the two investigators (c=0.733). there was genuine agreement (c=0.788) between the results of the qualitative and quantitative analyses carried out prospectively. volume measurements showed a nonsignificant tendency to lateralize more cases of clinically presumed hippocampal atrophy. our results confirm the reliability of a qualitative visual analysis and indicate the utility of hippocampal volumetry as a supplementar, objective and quantitative measure of hippocampal sclerosis.
Pseudo-aneurismas: relato de dois casos e revis o da literatura
Romanus Alexandre Bossmann,Mazer Sérgio,Carvalho Neto Arnolfo,Liu Christian Bark
Radiologia Brasileira , 2002,
Abstract: Pseudo-aneurismas s o uma afec o arterial rara. Os autores destacam a raridade da ocorrência de pseudo-aneurisma da artéria carótida comum pós-traumático e a associa o de pseudo-aneurisma com osteocondroma femoral. Enfatizam a importancia dos métodos por imagem, em especial a angiotomografia, no diagnóstico de afec es vasculares, como na ocorrência de pseudo-aneurismas. Realizam, ainda, revis o bibliográfica pertinente ao assunto.
Análises visual e volumétrica por ressonancia magnética das forma es hipocampais em um grupo de pacientes com diagnóstico clínico de epilepsia do lobo temporal
Arquivos de Neuro-Psiquiatria , 1998,
Abstract: Visando comparar a sensibilidade da avalia o volumétrica com a análise visual na avalia o por ressonancia magnética (RM) das forma es hipocampais de pacientes com epilepsia do lobo temporal refratária e candidatos à lobectomia temporal, estudamos 153 casos com diagnóstico clínico de epilepsia do lobo temporal, utilizando um equipamento de 0,5 Tesla, com técnica de inversion-recovery ponderada em T1, com cortes de 5 mm no plano coronal. Houve boa concordancia entre a análise visual prospectiva e outra retrospectiva, realizada por dois observadores independentes (C=0,748 e 0,720). Houve também concordancia entre a análise retrospectiva dos dois observadores (C=0,733). Houve ainda concordancia genuína (C=0,788) entre os resultados das análises quantitativa e qualitativa realizadas prospectivamente. A análise quantitativa demonstrou uma tendência n o-significativa a lateralizar mais casos de atrofia hipocampal presumida clinicamente. Nossos resultados confirmam a confiabilidade da análise visual qualitativa e indicam a utilidade da volumetria hipocampal como uma medida suplementar, objetiva e quantitativa, de esclerose hipocampal.
Al?a da artéria pulmonar: relato de dois casos e revis?o da literatura
Santana, Pablo Rydz Pinheiro;Irion, Klaus Loureiro;Escuissato, Dante Luiz;Porto, Nelson da Silva;Fisher, Gilberto Bueno;Mocelin, Helena Terezinha;Marchiori, Edson;Mazer, Sérgio;
Radiologia Brasileira , 2005, DOI: 10.1590/S0100-39842005000400014
Abstract: the authors report two cases of pulmonary artery sling diagnosed by three-dimensional reconstruction of images of the tracheobronchial tree and the esophagus acquired using magnetic resonance imaging or helical computer tomography. the typical clinical findings of this congenital abnormality, which may not be as rare as previously believed, include those related to severe tracheobronchial obstruction, although asymptomatic or mild symptomatic cases have been reported. early diagnosis of this anomaly is extremely important, since in most cases immediate surgical correction is indicated due to its high lethality. the use of three-dimensional reconstruction allows simultaneous identification of the associated tracheobronchial and cardiovascular malformations, in addition to a clear visualization of the anomaly. thus, the diagnosis can usually be established non-invasively, avoiding the use of the selective angiocardiography, considered the gold-standard.
Pseudo-aneurismas: relato de dois casos e revis?o da literatura
Romanus, Alexandre Bossmann;Mazer, Sérgio;Carvalho Neto, Arnolfo;Liu, Christian Bark;De Toni, Fernando Sandrini;Jacob, Graciela Vanessa Vicelli;Yamamoto, Luciano;
Radiologia Brasileira , 2002, DOI: 10.1590/S0100-39842002000500011
Abstract: pseudoaneurysms are considered rare conditions. the authors describe the rarity of the occurrence of a pseudoaneurysm secondary to traumatic injury of the common carotid artery in association with a femoral osteochondroma. the importance of imaging methods, particularly computed tomography angiography, in the diagnosis of vascular pathologies are emphasized, and the literature is reviewed.
Simple and safe heparin regimen for acute ischaemia
Bittencourt, P. R. M.;Padilha, S.;Mazer, S.;
Arquivos de Neuro-Psiquiatria , 1986, DOI: 10.1590/S0004-282X1986000100003
Abstract: the risk/benefit ratio of acute anticoagulation in ischaemic cerebro-vascular disease is not clearly established. a simple and safe intermittent intravenous heparin regimen (20000 iu daily) was used prospectively in 50 patients of 57 ± 14 (m ± sd) years of age whose blood pressures ranged from normal to severe hypertension. twenty-two patients had cardiogenic embolism and the remaining had recurrent severe transient ischaemic attacks of recent onset or progressive cerebral infarcts. time of exposure to heparin was 6.4 ± 4 (m±sd) days. two patients had recurrences of cerebral thromboembolism and none had bleeding complications. this is a safe and efficient method of anticoagulation for patients with cerebral ischaemia when continuous infusion of heparin or close monitoring of clotting times are not used routinely.
A educa o especial na forma o do pedagogo da classe hospitalar: uma quest o a ser discutida
Sheila Maria Mazer,Lúcia Maria Santos Tinós
Revista Educa??o Especial , 2011,
Abstract: O presente estudo tem como objetivo discutir se é necessária a forma o em Educa o Especial, como aponta a legisla o, para a atua o do pedagogo na Classe Hospitalar. Para tanto, foi realizada uma pesquisa qualitativa de fundamenta o fenomenológica, que buscou, por meio de entrevistas com duas professoras que atuam em Classe Hospitalar, analisar e discutir a pertinência ou n o da forma o em Educa o Especial na atua o profissional do pedagogo no hospital. Formar-se professor de Classe Hospitalar parece ser um aprendizado que vai muito além dos ensinamentos adquiridos na gradua o em Pedagogia e nas antigas habilita es em Educa o Especial, hoje extintas, sendo que a forma o continuada deve encontrar-se presente para e na atua o do professor da Classe Hospitalar. O estudo mostrou que há a necessidade de mais pesquisas referentes à forma o de professores para atua o em Classe Hospitalar. Palavras-chave: Classe Hospitalar; Forma o de professores; Educa o Especial.
Surround suppression and sparse coding in visual and barrel cortices
Robert N. S. Sachdev,Matthew R. Krause,James A. Mazer
Frontiers in Neural Circuits , 2012, DOI: 10.3389/fncir.2012.00043
Abstract: During natural vision the entire retina is stimulated. Likewise, during natural tactile behaviors, spatially extensive regions of the somatosensory surface are co-activated. The large spatial extent of naturalistic stimulation means that surround suppression, a phenomenon whose neural mechanisms remain a matter of debate, must arise during natural behavior. To identify common neural motifs that might instantiate surround suppression across modalities, we review models of surround suppression and compare the evidence supporting the competing ideas that surround suppression has either cortical or sub-cortical origins in visual and barrel cortex. In the visual system there is general agreement lateral inhibitory mechanisms contribute to surround suppression, but little direct experimental evidence that intracortical inhibition plays a major role. Two intracellular recording studies of V1, one using naturalistic stimuli (Haider et al., 2010), the other sinusoidal gratings (Ozeki et al., 2009), sought to identify the causes of reduced activity in V1 with increasing stimulus size, a hallmark of surround suppression. The former attributed this effect to increased inhibition, the latter to largely balanced withdrawal of excitation and inhibition. In rodent primary somatosensory barrel cortex, multi-whisker responses are generally weaker than single whisker responses, suggesting multi-whisker stimulation engages similar surround suppressive mechanisms. The origins of suppression in S1 remain elusive: studies have implicated brainstem lateral/internuclear interactions and both thalamic and cortical inhibition. Although the anatomical organization and instantiation of surround suppression in the visual and somatosensory systems differ, we consider the idea that one common function of surround suppression, in both modalities, is to remove the statistical redundancies associated with natural stimuli by increasing the sparseness or selectivity of sensory responses.
Interval Integration Revisited  [PDF]
Sérgio Galdino
Open Journal of Applied Sciences (OJAppS) , 2012, DOI: 10.4236/ojapps.2012.24B026
Abstract: We present an overview of approaches to selfvalidating?one-dimensional integration quadrature formulas and?a verified numerical integration algorithm with an adaptive?strategy. The new interval integration adaptive algorithm delivers?a desired integral enclosure with an error bounded by a specified?error bound. The adaptive technique is usually much more?efficient than Simpson’s rule and narrow interval results can?be reached.
Neurofibromatose e doen?a arterial oclusiva intracraniana extensa (doen?a de Moya-Moya): registro de um caso
Gracia, C. M.;Bittencourt, P. C. T.;Mazer, S.;Bittencourt, P. R. M.;
Arquivos de Neuro-Psiquiatria , 1986, DOI: 10.1590/S0004-282X1986000400011
Abstract: a 33-year-old female with neurofibromatosis and intracranial vascular lesions of the moya-moya type is reported. clinical and angiographic aspects of both syndromes are discussed with respect to earlier reports of this rare association, with the conclusion that it produces slow intelectual and motor deterioration in adolescents or young adults. there are no specific guidelines to therapy, and the prognosis is mixed, some patients ceasing to progress at least for a few years.
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