Papers by Guillermo Olivares
Neurocirugía, 2006
Resumen Objetivos. Describir el rendimiento neuropsicológico de pacientes con aneurismas cerebral... more Resumen Objetivos. Describir el rendimiento neuropsicológico de pacientes con aneurismas cerebrales que han sido tratados mediante cirugía o embolización, y determinar la existencia de diferencias en función de la modalidad de tratamiento. Material y métodos. Serie clínica compuesta por 93 pacientes voluntarios, con aneurismas cerebrales, tratados mediante cirugía (n = 56) o embolización (n = 37). A ambos grupos se les realizó una evaluación neuropsicológica retrospectiva, al menos un año después de realizar el tratamiento. Resultados. En ambos grupos se encontraron pacientes con déficit neuropsicológicos. En el grupo de pacientes tratados quirúrgicamente el porcentaje de pacientes sin ninguna afectación neuropsicológica es del 35.7%, mientras que en el grupo de pacientes embolizados este porcentaje asciende al 43.2%. Los análisis muestran una ejecución mejor en el grupo de tratamiento endovascular, respecto al quirúrgico, sólo en memoria visual y en el recuerdo con claves de la memoria verbal. Conclusiones. Años después del tratamiento, un importante porcentaje de pacientes presenta alteraciones neuropsicológicas. El tratamiento endovascular se asocia con un mejor rendimiento en memoria visual y en el recuerdo con claves de la memoria verbal, aunque explica un porcentaje muy escaso de la varianza. Por lo tanto, en la explicación del deterioro neuropsicológico parece más importante el propio efecto de la hemorragia que la modalidad de intervención. PALABRAS CLAVE: Aneurisma cerebral. Embolización. Cirugía. Cognición. Neuropsicología. Neuropsychological impairment in patients with intracranial aneurysms: surgical versus endovascular treatment Summary Objectives. To describe the neuropsychological status of patients with intracranial aneurysms and to compare the cognitive status of patients with intracranial aneurysm treated by surgical or endovascular mehtods. Material and methods. Ninety-three cases with intracranial aneurysms treated with surgery (n = 56) or embolization (n = 37) were included. A neuropsychological assessment was applied to both groups retrospectively, at least one year after treatment. Results. Neuropsychological impairment was found in both groups. 35.7% of the patients treated with surgery and 43.2%, of those treated with embolization did not show any cognitive impairment. Visual Memory and Cued Recall of verbal information are better in patients treated by embolization. Conclusions. Our results show that a large proportion of patients with intracranial aneurysms have cognitive impairment after treatment. Endovascular management may cause less impairment in visual and verbal memory. However, bleeding may be the most important factor to explain these cognitive impairments.
Acta Neurochirurgica, 2003
Objectives. The purpose of this report was to review our experience with stereotactic radiosurger... more Objectives. The purpose of this report was to review our experience with stereotactic radiosurgery in the management of patients with residual neurocytomas after initial surgery. Methods. Between October 1996 and December 2001, four patients with central neurocytoma were treated by surgery and subsequently underwent linear accelerator (LINAC) radiosurgery. Results. Two of the patients were cured, one exhibited a significant reduction in tumour size and the fourth remains stable. All four patients are alive and well. Conclusions. In cases of small residual tumours or recurrences radiosurgery allows open surgery to be avoided and is a safe and potentially effective approach.
International Journal of Chemical Reactor Engineering
Down-flow fluidization is an attractive unit operation because it allows having a smooth circulat... more Down-flow fluidization is an attractive unit operation because it allows having a smooth circulation of the fluid and the solid support material as well as an uninterrupted and controlled operation of the fluid. In addition, since the solid support material is less dense than the fluid, the pump energy consumption required for bed expansion is smaller in comparison with upward fluidization. Momentum transport in fluidized beds is usually modeled by macroscopic models, which are expressed in terms of effective-medium coefficients, by making analogies with transport in porous media. In practice, it is desirable to derive these models and to predict the involved coefficients in a reliable manner. For this reason, in this work we derive a macroscopic model for the hydrodynamics of down-flow fluidization, using the method of volume averaging obtaining a model with the form of Darcy’s law with a correction in the relative velocity of the fluid to the solid. A salient feature of the model ...
Revista do Instituto de Estudos Brasileiros, 2008
Resumo O texto procura fazer uma leitura da obra de Caio Prado Jr. aproveitando para isso uma bre... more Resumo O texto procura fazer uma leitura da obra de Caio Prado Jr. aproveitando para isso uma breve comparação temática com a experiencia agrária mexicana, em particular durante as décadas de 1930-1940, quando Prado produz algumas das suas obras fundamentais. Dá-se ênfase às diferenças e semelhanças em torno da reforma agrária, do problema da integração nacional, do tratamento diferenciado dos problemas da cultura no âmbito rural e, em especial, da "questão camponesa", sua definição e terminología.
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Papers by Guillermo Olivares