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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Inflamación y estrés oxidativo en el síndrome de isquemia crónica de miembros inferiores

Garcia Vidal, Raúl 19 October 2012 (has links)
El estrés oxidativo y la inflamación juegan un papel clave en la arterosclerosis. La formación de placa aterosclerótica y su progresión se caracteriza por una disfunción de las células endoteliales, la acumulación de agregados de las lipoproteínas en la íntima, y a la migración de monocitos a través del endotelio y su diferenciación en macrófagos. La peroxidación de los lípidos está relacionada con la progresión de la enfermedad de la estría grasa a la placa aterosclerótica avanzada. Exploramos por primera vez, si la relación inversa entre los mecanismos de defensa contra el estrés oxidativo del endotelio y la consiguiente respuesta inflamatoria se puede detectar en la sangre. Hemos encontrado que los resultados obtenidos de MCP-1 plasmático y las concentraciones séricas de PON1 y de PON3 prueban nuestra hipótesis y pueden constituir un nuevo indicador del estado de la enfermedad que pueden actuar como biomarcadores. / Inflamation and oxidative stress play a very important role in atherosclerosis. Atherosclerotic plaque formation and progression is characterized by disfunction of endothelial cells, the accumulation of aggregated lipoproteins in the intima, and monocyte migration across the endothelium and their differentiation into macrophages. The peroxidation of lipids is associated with the progression of the disease of the fatty streak to the advanced atherosclerotic plaque. We explore for the first time, if the inverse relationship between the defense mechanisms against oxidative stress and subsequent endothelial inflammatory response can be detected in blood. We found that that results of MCP-1 and serum PON1 and PON3 confirm our hypothesis and may provide a new indicator of the disease that can act as biomakers.
2

Influência da Pressão Arterial Sistêmica na Disfunção Erétil em Pacientes com Doença Arterial Periférica.

Spessoto, Luís Cesar Fava 10 September 2010 (has links)
Made available in DSpace on 2016-01-26T12:51:33Z (GMT). No. of bitstreams: 1 luiscesarfavaspessoto_dissert.pdf: 660807 bytes, checksum: 232ed6cc6092dbaf2e4af68080b238f3 (MD5) Previous issue date: 2010-09-10 / One of the symptoms of peripheral artery disease (PAD) is erectile dysfunction (ED) which is characterized by a man s persistent inability to obtain and maintain a sufficient erection for satisfactory sexual intercourse. An elevation in the systemic arterial blood pressure is a common risk factor of both ED and PAD. Objective: The aim of this study was to study the influence of systemic arterial blood pressure on ED in patients with PAD. Patients and method: Fifty-two patients with ED with and without cardiovascular risk factors and with ages ranging from 42 to 78 years old (56.63 ± 10.34 years) were studied from January to June 2009. The ED was classified as mild, moderate and severe utilizing the International Index of Erectile Function. A physical examination was carried including measurement of the ankle-arm index (AAI), determined as the ratio between the highest systolic artery pressure (SAP) comparing ankles and the highest SAP between the brachial arteries. Statistical analysis was achieved by binary logistic regression, Pearson Chi-squared test, the log-likelihood ratio Chi-squared test for independent samples and the Kruskal-Wallis test. The level of significance was set for an alpha error of 5% (p-value < 0.05). Results: Of the studied patients, 11/52 (21.2%) had mild (Grade 1), 24 (46.1%) had moderate (Grade 2) and 17 had severe ED (Grade 3). The SAP in the brachial and anterior tibial arteries varied xi from 110 to 190 mmHg and from 90 to 180 mmHg, respectively. In respect to the AAI, 28 (53.8%) of the patients presented normal values or above 0.9 and 24 (46.2%) presented values of less than 0.9 thereby identifying PAD. Significant differences were identified on comparing the median degree of dysfunction of patients in different phases of PAD (p = 0.001) and between Grade 1 and Grade 3 (p = 0.0003) using the Kruskal-Wallis test with Bonferroni correction for multiple comparisons. Binary logistic regression showed that normotensive individuals in the initial phase of PAD with AAI between 0.8 and 0.9 presented with more severe ED when compared to hypertensive patients. Conclusions: An elevated systemic arterial pressure may have a protective effect against erectile dysfunction in the initial phases of peripheral arterial disease. / Um dos sintomas da doença arterial periférica (DAP) é a disfunção erétil (DE), que é caracterizada pela inabilidade persistente do homem em obter ou manter ereção suficiente para o intercurso sexual satisfatório. Tanto a DE como a DAP apresentam como fator de risco em comum a elevação da pressão arterial sistêmica. Objetivo: O objetivo desta pesquisa foi estudar a influência da pressão arterial sistêmica na DE em pacientes com DAP. Casuística e Método: Foram estudados 52 pacientes com DE com ou sem fator de risco cardiovascular, cuja idade variou de 42 a 78 anos (56,63 ± 10,34 anos) no período de janeiro a junho de 2009. A DE foi classificada em leve, moderada e grave utilizando o Índice Internacional de Função Erétil. Foi realizado exame físico geral direcionado por meio do índice tornozelo-braquial (ITB), determinado pela razão entre a mais elevada pressão arterial sistólica (PAS) do tornozelo e a mais elevada PAS entre as artérias braquiais. A análise de dados foi feita por meio de regressão logística binária, qui-quadrado de Pearson, quiquadrado da razão de verossimilhança para amostras independentes e Kruskal-Wallis, considerando erro alfa de 5%. Resultados: Dos pacientes estudados (n = 52), 11 (21,2%) tinham DE leve (grau 1), 24 (46,1%) moderada (grau 2) e 17 (32,7%) grave (grau 3). A PAS nas artérias braquial e tibial anterior variou de 110 a 190 mmHg e 90 a 180 mmHg, ix respectivamente. Com relação ao ITB, 28 (53,8%) dos pacientes apresentaram valores normais ou acima de 0,9 e 24 (46,2%) valores inferiores a 0,9, indicando a ocorrência de DAP. O resultado da comparação entre a mediana dos graus de DE de pacientes com diferentes fases de DAP por meio do teste de Kruskal-Wallis com correção de Bonferroni para comparações múltiplas das medianas mostrou diferenças significativas (p = 0,001) e entre os graus 1 e 3 (p = 0,0003). A regressão logística binária revelou que normotensos na fase inicial da DAP com ITB entre 0,8 e 0,9 apresentaram DE mais grave quando comparado com hipertensos. Conclusões: A pressão arterial sistêmica elevada pode ter efeito protetor contra a disfunção erétil nas fases iniciais da doença arterial periférica.

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