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Search Results: 1 - 10 of 33306 matches for " Daniel Cabezas Gaete "
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Marianela Denegri Coria*,Daniel Cabezas Gaete**,,Jocelyne Sepúlveda Aravena***,,Carlos del Valle Rojas****
Liberabit , 2010,
Abstract: RESUMENEl propósito del estudio fue determinar y describir las representaciones sociales de estudiantes universitarios chilenossobre pobreza, sus causas y soluciones. Se empleó la Técnica de Redes Semánticas Naturales (Valdez, 1998), el instrumentose aplicó a 121 estudiantes de las Facultades de Educación y Humanidades y Medicina de la Universidad de La Frontera.Los análisis fueron realizados en base a los valores que arrojan las redes semánticas. Los resultados dan cuenta decontenidos comunes en las representaciones sociales de ambos grupos, matizadas probablemente por la formación académica,observando diferencias en relación a la importancia que asignan a factores de carácter histórico y social. Los hallazgos sediscuten en relación a aspectos estructurales del pensamiento.ABSTRACTThe purpose of the study was to determine and describe the social representations of Chilean university students aboutpoverty, its causes and solutions. We used the technique of semantic network (Valdez, 1998), we applied the instrument to121 students from the Faculties of Education and Humanities and Medicine of the University of La Frontera. The analyseswere carried out based on values of the semantics network. The results indicate common contents in the social representationsof both groups, probably nuanced by academic formation; we observed differences among students groups related to theimportance that they assigned to historic and social factors. We discussed the results about structural aspects thoughts.
Scale Attitude toward Indebtedness: factorial validity and attitudinal profiles in Chilean university students [Escala de Actitudes hacia el Endeudamiento: validez factorial y perfiles actitudinales en estudiantes universitarios chilenos]
Marianela Denegri Coria,Daniel Cabezas Gaete,Carlos Del Valle Rojas,Yessica González Gómez
Universitas Psychologica , 2012,
Abstract: The number of university students who present an early indebtedness has increased in the last years, which represents a potential risk for his financial stability. This study examined validity factorial of the Scale of Attitudes toward the Indebtedness (Denegri et al., 1999) and determines the existence of profile attitudinal typology towards the indebtedness in a sample of 984 university Chilean students with ages between 18 and 25 years. The results indicate the presence of two independent factors named Hedonism and Aus- terity, from which four profiles of attitudes decided towards the indebtedness named: austere, diffuse, hedonistic and ambivalent those who might be to the base of his behaviors of acceptance or rejection of the indebtedness.
CADASIL: Una forma de demencia vascular hereditaria: Presentación de un caso clínico aparentemente esporádico
Sáez,David; Trujillo,Osvaldo; Nogales-Gaete,Jorge; Figueroa,Tatiana; Valenzuela,Daniel;
Revista chilena de neuro-psiquiatría , 2003, DOI: 10.4067/S0717-92272003000100002
Abstract: we describe a patient with cadasil (cerebral autosomal dominant arteriopathy with subcortical infarcts and leukoencephalopathy), the first of four patients diagnosed in our service since 1998, correlating clinical, imaging, and muscular pathology (on electronic microscopy) data. the patient is a woman with no risk factors for cerebrovascular pathology who suffered two transient ischemic attacks at the age of 29. seven years later, she developed symptoms of depression manifested as psychomotor withdrawal and progressive parkinsonism that did not respond to pharmacological treatment. an mri brain scan showed extensive bilateral alterations in the white matter in the frontal and occipital regions, hyperintense in t2 and hypointense in t1-weighted images, without gadolinium enhancement. they had no mass effect, were associated with leukoaraiosis, and were compatible with the diagnosis of cadasil. muscle biopsy showed an arteriopathy with cadasil-type osmiophilic granular deposits in the blood vessels. no history of symptomatic dementia or cerebrovascular disorders were found among the patient?s mother, father, aunts, uncles, or grandparents. this is most likely a sporadic case. no genetic studies or biopsies were done in asymptomatic relatives
Fibroangioma nasofaríngeo juvenil: Experiencia de 12 a?os en el Hospital Clínico de la Universidad de Chile
Walker J,Katherine; Mu?oz S,Daniel; Gaete F,Claudio; Celedón L,Carlos;
Revista de otorrinolaringología y cirugía de cabeza y cuello , 2010, DOI: 10.4067/S0718-48162010000100003
Abstract: introduction: juvenile nasopharyngeal angiofibroma is a vascular tumor that occurs almost exclusively in the nasopharynx of adolescent males. its management is complex because of its vascular nature and frequent recurrence. aim: to review the experience of 12 years in juvenile nasopharyngeal angiofibroma. material and method: retrospective study of patients admitted with diagnosis of juvenile nasopharyngeal angiofibroma at the otorhinolaryngology department, university of chile clinical hospital, between 1996 and 2008, characterizing the study group in terms of clinical features, diagnosis, treatment, complications and recurrences. results: we obtained 22 patients, all male, with an average age of 17.7 years. the most common presenting symptom was recurrent epitasis, present in up to 81.8% of cases. all patients were studied with computed tomography and received preoperative arterial embolization. most tumors were type iib and c (68.1%) and the endoscopic surgical technique was predominant. there was only one major complication, but derived from the embolization procedure and not the surgery itself. there was a 22.7%> recurrence, with disease-free time of 8.2 months on average. discussion and conclusion: our results agree with most of the series published in the literature. the therapeutic decision is based on the determination of tumor size and extension, preferring an initial endoscopic approach, for its minimally invasive nature and because they present less bleeding, surgical time and hospital stay if the tumor stage allows. arterial embolization, regardless of the surgical approach, should be routine.
Resonancia magnética de la endometriosis: Revisión pictográfica MR imaging of pelvic endometriosis: A pictorial review
Javiera Aguirre F,Cristian Medina S,Daniel Gaete D,Giancarlo Schiappacasse F
Revista Chilena de Radiología , 2012,
Abstract: La endometriosis es la presencia de tejido endometrial fuera de la cavidad uterina(1-3). El tejido endometrial puede localizarse en los ovarios como endometriomas y/o como implantes a nivel subperitoneal o extraperitoneal(3,4). Cuando estos implantes son mayores a 5 mm de profundidad, se denomina endometriosis profunda(3,4). Es una causa frecuente de algia pélvica e infertilidad en mujeres jóvenes(1-3). La cirugía sigue siendo la mejor opción terapéutica por lo que la valoración preoperatoria de la extensión de la enfermedad es fundamental(3,4). La resonancia magnética (RM) es un método no invasivo, sin el uso de radiación ionizante y con alta resolución de contraste, que permite la evaluación multiplanar de la endometriosis, facilitando así el diagnóstico correcto y el tratamiento adecuado(2-4). Los radiólogos deben estar familiarizados con los hallazgos de imagen de RM de la endometriosis, a fin orientar al clínico y proporcionar información adecuada para el diagnóstico y tratamiento de esta patología. Endometriosis is the presence of endometrial tissue outside the uterine cavity(1-3). This endometrial tissue may be located in the ovaries as endometriomas and/or as extraperitoneal(3,4)./subperitoneal implants When implant depth is greater than 5 mm, condition is referred to as deep endometriosis(3,4). It represents a common cause of pelvic pain and infertility in young women(1-3). Surgery remains the best treatment option, so pre-operative evaluation to assess the extent of disease is essential(3,4). Magnetic resonance imaging (MRI) is a non-invasive, non-ionizing radiation method, offering high contrast resolution, which allows multiplanar evaluation of endometriosis, thus facilitating a correct diagnosis and appropriate treatment(2-4). Radiologists have to be familiar with MR imaging appearance of endometriosis, in order to guide clinicians and provide adequate information to assure accurate diagnosis and timely treatment of this entity.
Fibroangioma nasofaríngeo juvenil: Experiencia de 12 a os en el Hospital Clínico de la Universidad de Chile Juvenile nasopharyngeal angiofibroma: 12 years experience at the University of Chile Clinical Hospital
Katherine Walker J,Daniel Mu?oz S,Claudio Gaete F,Carlos Celedón L
Revista de Otorrinolaringología y Cirugía de Cabeza y Cuello , 2010,
Abstract: Introducción: El fibroangioma juvenil es un tumor vascular que afecta casi exclusivamente la nasofaringe de adolescentes de sexo masculino. Su manejo es complejo dada su naturaleza vascular y sus frecuentes recurrencias. Objetivo: Mostrar la experiencia de 12 a os en fibroangioma juvenil Material y método: Estudio descriptivo retrospectivo de los pacientes que Ingresaron con diagnóstico de fibroangioma nasofaríngeo juvenil al Servicio de Otorrinolaringología del Hospital Clínico de la Universidad de Chile entre los a os 1996 y 2008, caracterizando al grupo de estudio en cuanto a clínica, diagnóstico, manejo terapéutico, complicaciones y recurrencias. Resultados: Se obtuvo un total de 22 pacientes, todos de sexo masculino, con un promedio de edad de 17,7 a os. El síntoma de presentación más frecuente fue la epistaxis a repetición presente en el 81,8% de los casos. Todos los pacientes se estudiaron con tomografia computarizada y recibieron embolización arterial preoperatoria. La mayoría de los tumores fueron de tipo IIByllC (68,1 %) según Radkowski y la técnica quirúrgica más empleada fue la endoscópica (54,5%). Hubo sólo una complicación mayor, pero derivada del procedimiento de embolización y no de la cirugía propiamente tal. Se encontró 22,7%> de recurrencias (n =5, todas endoscópicas), con un tiempo libre de enfermedad de 8,2 meses promedio. Discusión y conclusión: Nuestros resultados concuerdan con la gran mayoría de las series publicadas en la literatura. La decisión terapéutica se basa en la determinación del tama o tumoral y su extensión, prefiriendo inicialmente un abordaje endoscópico por su carácter poco invasivo y por presentar menor sangrado, tiempo quirúrgico y estadía hospitalaria; siempre que el estadio tumoral lo permita. La embolización arterial, independiente de la vía de abordaje, debe ser de rutina. Introduction: Juvenile nasopharyngeal angiofibroma is a vascular tumor that occurs almost exclusively in the nasopharynx of adolescent males. Its management is complex because of its vascular nature and frequent recurrence. Aim: To review the experience of 12 years in juvenile nasopharyngeal angiofibroma. Material and method: Retrospective study of patients admitted with diagnosis of juvenile nasopharyngeal angiofibroma at the Otorhinolaryngology Department, University of Chile Clinical Hospital, between 1996 and 2008, characterizing the study group in terms of clinical features, diagnosis, treatment, complications and recurrences. Results: We obtained 22 patients, all male, with an average age of 17.7 years. The most common presenting sym
Plasmaféresis indicada por enfermedad neurológica: Experiencia de 140 procedimientos en 47 pacientes Plasmapheresis in neurological diseases: Experience in 140 procedures in 47 patients
Jorge Nogales-Gaete,Daniel Valenzuela T,Federico Liendo P,Pamela Vidal A
Revista médica de Chile , 2004,
Abstract: Background: Plasmapheresis can be useful in myasthenia gravis, Guillain Barré syndrome and chronic demyelinating inflamatory polyradiculoneuritis. Aim: To report our experience with plasmapheresis in patients with neurological diseases. Material and methods: Retrospective review of plasmapheresis procedures done between 1995 and 2001, in a public hospital. Indications criteria, clinical results and technical yield were analyzed. Results: One hundred fifty nine procedures were reviewed. One hundred forty (88%) were indicated for neurological diseases (44% for Guillain Barré syndrome and 29% for myasthenia gravis). Clinical improvement or eventual complications were avoided in 70% of patients with Guillain Barré syndrome and 100% of patients with myasthenia gravis. Hypotension in 10% and paresthesias in 7% were observed. All complications were successfully controlled with crystalloid or fresh plasma infusions or citrate management. In 11 cases, the procedure was interrupted due to obstruction of the venous access, that was peripheral in eight of these. The most common difficulties of the procedure were delay in performing it in 50% of patients and insufficient exchange volumes in 30%. Conclusions: Plasmapheresis was safe and useful in patients with myasthenia gravis and Guillain Barré syndrome. The drawbacks of the procedure are its costs and requirement of special equipment (Rev Méd Chile 2004; 132: 295-8).
Anticuerpos séricos contra la enfermedad de Newcastle e Influenza Aviar en aves rapaces de Chile.
Daniel González-Acu?a,álvaro Gaete,Lucila Moreno,Karen Ardiles
Revista MVZ Córdoba , 2012,
Abstract: Objetivo. Detectar la presencia de anticuerpos séricos sanguíneos contra los virus de la Enfermedad de Newcastle (ENC) e Influenza aviar (IA), para comprender la contribución de las aves silvestres en la transmisión de estos virus en Chile. Materiales y métodos. Se analizaron 63 aves pertenecientes a los órdenes Falconiformes y Strigiformes desde centros de rehabilitación de aves de las zonas central y sur de Chile. Se realizaron las pruebas de inhibición de la hemoaglutinación (IHA) para detectar anticuerpos contra el virus ENC e inmunodifusión en gel agar (IDGA) y ELISA para IA. Resultados. Se detectaron 14 aves positivas (22.2%) para anticuerpos séricos contra el virus de la ENC. En cambio, no se registraron anticuerpos séricos sanguíneos para el virus de la IA. Conclusiones. La presencia de aves rapaces positivas en los centros de rescate a los anticuerpos séricos contra el virus de la ENC puede ser explicada por el consumo de carne de pollos que han sido vacunados contra ENC o consumo de aves que han adquirido directamente el virus vacunal a través de los distintos procedimientos de administración (aerosoles, bebederos) de la vacuna o por el ingreso a los centros de rescate de aves rapaces migratorias, las que podrían facilitar la diseminación de la infección desde los países de origen, hecho que debe ser investigado.
Remarks on Gauge-Invariant Variables and Interaction Energy in QED
Patricio Gaete
Physics , 1998, DOI: 10.1103/PhysRevD.59.127702
Abstract: The calculation of the interaction energy in pure QED and Maxwell-Chern-Simons gauge theory is re-examined by exploiting the path dependence of the gauge-invariant variables formalism. In particular, we consider a spacelike straight line which leads to the Poincar\'{e} gauge. Subtleties related to the problem of exhibiting explicitly the interaction energies are illustrated.
Some remarks about gauge-invariant Yang-Mills fields
Patricio Gaete
Physics , 2000,
Abstract: In order to eliminate gauge variant degrees of freedom we study the way to introduce gauge invariant fields in pure non-Abelian Yang-Mills theory. Our approach is based on the use of the gauge-invariant but path-dependent variables formalism. It is shown that for a special class of paths these fields coincide with the usual ones in some definite gauges. The interquark potential is discussed by exploiting the rich structure of the gluonic cloud or dressing around static fermions.
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