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Previous issue date: 2012-12-18 / Introduction : There have been national and international recommendations to estimate glomerular filtration rate as a predictor of kidney disease, in the general population, measuring plasma creatinine concentration. In pediatrics, however, there is a high incidence of factors that affect plasma creatinine concentration, such as growth rate and the equations most commonly used to estimate GFR are derivative from Bedside Schwartz formula. The serum cystatin C, an unglycosylated protein of low molecular weight, produced by all nucleated cells, has been proposed as a marker of glomerular filtration. In this context in Brazil, there have been doubts among professionals about using cystatin C in pediatrics, due to the lack of appropriate studies about it. Objective : We sought to investigate the transversal diagnostic accuracy, either related to cystatin C or plasma creatinine or both in comparison with inulin, for estimating changes in GFR in a prospective cohort of children with kidney disease. Patients and Methods : Firstly, we have chosen as methodological strategy for the estimation of GFR the measurement by inulin clearance, in pediatrics and in a young adult population, followed by a respective publication. Secondly, we have used repeated and simultaneous measurements of renal clearance by inulin in pediatric patients. The analysis has been performed by linear mixed model due to the number of repeated measurements from the same patient. In order to assess the equivalence between methods, we applied Bland & Altman graphics, as well as concordance correlation tests. In a second phase, we had cystatin C and serum creatinine measured in pediatric renal patients, including those patients who had undergone a transplant. Consequently, an article was submitted to publication and another one was submitted to analysis. Results : This thesis has generated four presentations at international scientific congresses, 4 articles and 1 book chapter in French (attached). Conclusions : The adequate measurement of GFR is of fundamental importance in clinical practice in all phases of one's life. The GFR progressively declines with time, in most renal diseases, which results in complications such as hypertension, anemia, malnutrition, bone disease, neuropathies. / Introdu??o : As recomenda??es internacionais e nacionais recomendam a aferi??o da taxa de filtra??o glomerular como preditor de doen?a renal na popula??o geral, com uso de creatinina plasm?tica. Entretanto, na pediatria existe uma alta preval?ncia de fatores que interferem na creatinina plasm?tica, dentre os quais a taxa de crescimento. As equa??es mais empregadas s?o derivadas da f?rmula de Schwartz abreviada (bedside). A cistatina C s?rica, uma prote?na n?o glicosilada de baixo peso molecular que ? produzida por todas as c?lulas nucleadas, tem sido apontada como um marcador de filtra??o glomerular. Nesse contexto, h? d?vidas em rela??o ? cistatina C na pediatria, devido ? escassez de estudos com delineamento adequado no Brasil. Objetivo : Avaliar transversalmente a acur?cia diagn?stica da cistatina C, creatinina plasm?tica, ou ambas em estimar mudan?as na TFG comparados ? inulina numa coorte prospectiva de crian?as com doen?a renal. Pacientes e M?todos : Em uma fase inicial, adquirimos a estrat?gia metodol?gica para a realiza??o da TFG por depura??o plasm?tica de inulina, em pediatria e na popula??o de adultos jovens, com respectiva publica??o. Ap?s, utilizou-se de medidas simult?neas e repetidas de depura??o renal de inulina em pacientes pedi?tricos. A an?lise foi realizada por modelo linear misto, devido ao n?mero repetido de medidas no mesmo paciente. Para avaliar a concord?ncia entre os m?todos foram utilizados gr?ficos de Bland Altman e teste de correla??o de concord?ncia. Em uma segunda fase, foram realizadas medidas de cistatina C e de creatinina plasm?tica em pacientes renais pedi?tricos, inclusive transplantados, com subsequente publica??o de um artigo e submiss?o de outro para an?lise. Resultados : Essa tese gerou 4 apresenta??es em congressos cient?ficos internacionais, 4 artigos e 1 cap?tulo de livro em franc?s (em anexo). Conclus?es : A aferi??o adequada da TFG ? de fundamental import?ncia na pr?tica cl?nica em todas as fases da vida do indiv?duo. A TFG declina progressivamente, com o tempo, na maioria das enfermidades renais, o que resulta em complica??es como hipertens?o arterial, anemia, desnutri??o, enfermidade ?ssea, neuropatias.
| Identifer | oai:union.ndltd.org:IBICT/oai:tede2.pucrs.br:tede/1718 |
| Date | 18 December 2012 |
| Creators | Selistre, Luciano da Silva |
| Contributors | Saitovitch, David |
| Publisher | Pontif?cia Universidade Cat?lica do Rio Grande do Sul, Programa de P?s-Gradua??o em Medicina e Ci?ncias da Sa?de, PUCRS, BR, Faculdade de Medicina |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/doctoralThesis |
| Format | application/pdf |
| Source | reponame:Biblioteca Digital de Teses e Dissertações da PUC_RS, instname:Pontifícia Universidade Católica do Rio Grande do Sul, instacron:PUC_RS |
| Rights | info:eu-repo/semantics/openAccess |
| Relation | 7620745074616285884, 500, 600, -8624664729441623247 |
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