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Search Results: 1 - 10 of 4399 matches for " Andraus Cesar Fantezia "
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Development of target centered arc apparatus for neurosurgical stereotactic procedures
Andraus Cesar Fantezia
Arquivos de Neuro-Psiquiatria , 2002,
Stereotactic evacuation of spontaneous intracerebral hematomas
Arquivos de Neuro-Psiquiatria , 2000,
Periodic EEG patterns: importance of their recognition and clinical significance
Andraus, Maria Emilia Cosenza;Andraus, Cesar Fantezia;Alves-Leon, Soniza Vieira;
Arquivos de Neuro-Psiquiatria , 2012, DOI: 10.1590/S0004-282X2012000200014
Abstract: periodic electroencephalographic (eeg) patterns consist of discharges usually epileptiform in appearance, which occur at regular intervals, in critical patients. they are commonly classified as periodic lateralized epileptiform discharges (pleds), bilateral independent pleds or bipleds, generalized epileptiform discharges (gpeds) and triphasic waves. stimulus-induced rhythmic, periodic or ictal discharges (sirpids) are peculiar eeg patterns, which may be present as periodic discharges. the aim of this study is to make a review of the periodic eeg patterns, emphasizing the importance of their recognition and clinical significance. the clinical significance of the periodic eeg patterns is uncertain, it is related to a variety of etiologies, and many authors suggest that these patterns are unequivocally epileptogenic in some cases. their recognition and classification are important to establish an accurate correlation between clinical, neurological, laboratorial and neuroimaging data with the eeg results.
SPECT cerebral interictal em pacientes com epilepsia do lobo temporal de difícil controle
Andraus Maria Emilia Cosenza,Cosenza Carlos Alberto Nunes,Fonseca Léa Mirian Barbosa da,Andraus Cesar Fantezia
Arquivos de Neuro-Psiquiatria , 2002,
Abstract: O objetivo desse estudo foi avaliar a utilidade do SPECT cerebral interictal na localiza o do foco epileptogênico em 23 pacientes do Ambulatório de Epilepsias do Hospital Universitário Clementino Fraga Filho (HUCFF/UFRJ), com epilepsia do lobo temporal (ELT) de difícil controle e tomografia computadorizada (TC) do cranio normal, estudando a correla o entre SPECT interictal, eletrencefalograma (EEG) e, em 11 casos, ressonancia magnética (RM) do cranio, e comparar os resultados com os de outras seis séries da literatura. Doze (52,2%) pacientes apresentaram SPECT anormal. Entre esses, cinco (41,6% dos SPECTs anormais) apresentaram altera o unilateral ao SPECT do mesmo lado do EEG (hipoperfus o em 4 e hiperperfus o em 1), três (25% dos SPECTs anormais) apresentaram hipoperfus o bilateral ao SPECT e altera es também bilaterais ao EEG e 4 (33,3% dos SPECTs anormais) apresentaram hipoperfus o unilateral ao SPECT e EEG bilateral. A análise estatística fundamentou-se na lógica fuzzy. Os índices de correla o entre SPECT X EEG, SPECT X RM e SPECT X EEG X RM foram altamente significativos, com níveis de significancia de 0,01, p < 0,0005 e intervalo de 99% de confian a em todas as correla es. Os estudos de correla o entre as séries estudadas apresentaram resultados semelhantes entre si.
Apoplexia hipofisária intradenomatosa
Rodrigues, Flávio Freinkel;Violante, Alice Helena Dutra;Andraus, Cesar Fantezia;
Arquivos de Neuro-Psiquiatria , 1997, DOI: 10.1590/S0004-282X1997000500020
Abstract: the authors review the literature on intra-adenomatous pituitary apoplexy with special emphasis on pathophysiology, diagnosis and therapeutic approach. they present five cases, from a series of 86 patients with pituitary tumors, that developed this syndrome. the patients were diagnosed and followed by the neurosurgery and endocrinology services of hospital universitário clementino fraga filho, universidade federal do rio de janeiro. diagnosis was confirmed by ct-scan and mri in all cases , and the treatment of choice was surgical. conclusions point to the diagnostic difficulties and the urgency of treatment in this clincal setting.
SPECT cerebral interictal em pacientes com epilepsia do lobo temporal de difícil controle
Andraus, Maria Emilia Cosenza;Cosenza, Carlos Alberto Nunes;Fonseca, Léa Mirian Barbosa da;Andraus, Cesar Fantezia;D'Andrea, Isabela;Alves-Leon, Soniza Vieira;
Arquivos de Neuro-Psiquiatria , 2002, DOI: 10.1590/S0004-282X2002000500019
Abstract: the objective of this study was to evaluate the utility of interictal brain spect in localizing the epileptogenic focus in a population of patients of epilepsy clinic of hospital universitário clementino fraga filho (hucff/ufrj), with medically refractory temporal lobe epilepsy (tle) and normal computed tomography (ct) scans, studying the correlation between spect, electroencephalogram (eeg) and, in 11 cases, brain magnectic resonance imaging (mri), and to compare the results to the other six literatura series. twelve (52.2%) patients presented abnormal spect. among these, five (41.6% of abnormal spects) presented unilateral spect changes at the same side of eeg (hypoperfusion in four and hyperperfusion in one), three (25% of abnormal spects) presented bilateral hypoperfusion and bilateral eeg changes too, and four (33.3%) presented unilateral hypoperfusion and bilateral eeg changes. the statistical analysis was based on fuzzy logic. the correlation index among spect x eeg, spect x mri and spect x eeg x mri were highly significant, with signifcance levels at 0.01, p < 0.0005 and trust interval at 99% in all correlations. the correlation studies between the series presented similar results.
Multiple-particle diffusion processes from the viewpoint of Dunkl operators: relaxation to the steady state
Sergio Andraus
Physics , 2014,
Abstract: Two families of stochastic interacting particle systems, the interacting Brownian motions and Bessel processes, are defined as extensions of Dyson's Brownian motion models and the eigenvalue processes of the Wishart and Laguerre processes where the parameter $\beta$ from random matrix theory is taken as a real positive number. These are systems where several particles evolve as individual Brownian motions and Bessel processes while repelling mutually through a logarithmic potential. These systems are also special cases of Dunkl processes, a broad family of multivariate stochastic processes defined by using Dunkl operators. In this thesis, the steady state under an appropriate scaling and and the freezing ($\beta\to\infty$) regime of the interacting Brownian motions and Bessel processes are studied, and it is proved that the scaled steady-state distributions of these processes converge in finite time to the eigenvalue distributions of the $\beta$-Hermite and $\beta$-Laguerre ensembles of random matrices. It is also shown that the scaled final positions of the particles in these processes are fixed at the zeroes of the Hermite and Laguerre polynomials in the freezing limit. These results are obtained as the consequence of two more general results proved in this thesis. The first is that Dunkl processes in general converge in finite time to a scaled steady-state distribution that only depends on the type of Dunkl process considered. The second is that in the freezing limit, their scaled final position is fixed to a set of points called the peak set, which is the set of points which maximizes their steady-state distribution.
Video-electroencephalography prolonged monitoring in the diagnosis of medically refractory temporal lobe epilepsy: appliance of fuzzy hierarchy COPPE/Cosenza Model
Andraus Maria Emilia Consenza
Arquivos de Neuro-Psiquiatria , 2004,
Interictal brain SPECT in patients with medically refractory temporal lobe epilepsy
Arquivos de Neuro-Psiquiatria , 2000,
Two-step asymptotics of scaled Dunkl processes
Sergio Andraus,Seiji Miyashita
Physics , 2014, DOI: 10.1063/1.4932964
Abstract: Dunkl processes are generalizations of Brownian motion obtained by using the differential-difference operators known as Dunkl operators as a replacement of spatial partial derivatives in the heat equation. Special cases of these processes include Dyson's Brownian motion model and the Wishart-Laguerre eigenvalue processes, which are well-known in random matrix theory. It is known that the dynamics of Dunkl processes is obtained by transforming the heat kernel using Dunkl's intertwining operator. It is also known that, under an appropriate scaling, their distribution function converges to a steady-state distribution which depends only on the coupling parameter $\beta$ as the process time $t$ tends to infinity. We study scaled Dunkl processes starting from an arbitrary initial distribution, and we derive expressions for the intertwining operator in order to calculate the asymptotics of the distribution function in two limiting situations. In the first one, $\beta$ is fixed and $t$ tends to infinity (approach to the steady state), and in the second one, $t$ is fixed and $\beta$ tends to infinity (strong-coupling limit). We obtain the deviations from the limiting distributions in both of the above situations, and we find that they are caused by the two different mechanisms which drive the process, namely, the drift and exchange mechanisms. We find that the deviation due to the drift mechanism decays as $t^{-1}$, while the deviation due to the exchange mechanism decays as $t^{-1/2}$.
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