oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

2019 ( 22 )

2018 ( 28 )

2017 ( 24 )

2016 ( 24 )

Custom range...

Search Results: 1 - 10 of 19445 matches for " Ricardo;Kalil "
All listed articles are free for downloading (OA Articles)
Page 1 /19445
Display every page Item
Comparison between right and left ventricular myocardia during the human fetal period. Stereological evaluation
Xavier-Vidal, Ricardo;Madi, Kalil;
Arquivos Brasileiros de Cardiologia , 1999, DOI: 10.1590/S0066-782X1999000500005
Abstract: purpose: to develop a stereological comparison between right (rv) and left ventricle (lv) myocardium during the third human gestational trimester. methods: five human fetal hearts of the third trimester provided representative samples of 5 rv myocardium and 4 lv myocardium. the material was fixed in 10% buffered formaldehyde, and processed through routine methods. fifteen microscopic fields were randomly chosen and counted in each ventricular myocardium using an "m-42" test system. the following stereological parameters were assessed: vv (%), lv (μm2), sv (μm2/μm3), vp (μm3), nv (1/mm3) and total n. results: no significant difference between the stereological parameters of the myocardial structures assessed was evidenced, when comparing rv and lv. conclusion: right and left human ventricular myocardium are very similar during the fetal period at least in regard to their structural aspects.
Osteocondromas da coluna vertebral: um diagnóstico a considerar nas síndromes de compress?o medular
Botelho, Carlos H. A.;Kalil, Ricardo K.;
Arquivos de Neuro-Psiquiatria , 1996, DOI: 10.1590/S0004-282X1996000400010
Abstract: the authors reviewed 312 cases of solitary and multiple osteochondromas seen in sarah hospital for the locomotor system during a period of 13 years - from 1982 to 1994. they selected six cases of patients with osteochondromas of the spine, corresponding to 1.92% of the total number of diagnosed cases of this entity. the selected cases were submitted to roentgenographic examination that comprised plain roentgenograms, myelography, computerized tomography and, in one of them, magnetic resonance imaging. they were submitted to decompressive surgical procedures (including laminectomy) with exeresis of the lesions and posterior histopathological examination which confirmed the initial diagnostic hypothesis. this study also includes a review of the possible mechanisms implicated in the pathogenesis of the disease.
Comparison between right and left ventricular myocardia during the human fetal period. Stereological evaluation
Xavier-Vidal Ricardo,Madi Kalil
Arquivos Brasileiros de Cardiologia , 1999,
Abstract: PURPOSE: To develop a stereological comparison between right (RV) and left ventricle (LV) myocardium during the third human gestational trimester. METHODS: Five human fetal hearts of the third trimester provided representative samples of 5 RV myocardium and 4 LV myocardium. The material was fixed in 10% buffered formaldehyde, and processed through routine methods. Fifteen microscopic fields were randomly chosen and counted in each ventricular myocardium using an "M-42" test system. The following stereological parameters were assessed: Vv (%), Lv (μm2), Sv (μm2/μm3), Vp (μm3), Nv (1/mm3) and total N. RESULTS: No significant difference between the stereological parameters of the myocardial structures assessed was evidenced, when comparing RV and LV. CONCLUSION: Right and left human ventricular myocardium are very similar during the fetal period at least in regard to their structural aspects.
Scwannoma intramedular: relato de caso
Botelho, Carlos H. A.;Kalil, Ricardo K.;Masini, Marcos;
Arquivos de Neuro-Psiquiatria , 1996, DOI: 10.1590/S0004-282X1996000300023
Abstract: the intramedullary localization of schwannomas is rare, corresponding to 0.3% of all intraspinal tumors. the authors report the case of a 52 year-old white female patient that presented with symptoms of spinal compression by the presence of an intramedullary schwannoma at the level c4-c6. there were no symptoms of neurofibromatosis, entity frequently related to the lesion. the magnetic resonance imaging examination and the per-operatory biopsy were decisive factors in planning and executing the treatment , by establishing the characteristics, location and diagnosis of the lesion. its delimitation and posterior location have facilitated total surgical exeresis. the transoperatively histopathologic examination allowed adequate surgical procedure. the schwann cell is not found normally in the central nervous system and its presence in this site has been subject of many theories exposed in this paper, which proposes comprehensive review of the clinical aspects, imaging diagnosis, pathology, differential diagnosis and treatment of schwannomas. it is probable that, with the advances verified in the available diagnostic methods, a greater number of these lesions may be diagnosed in the future.
QUANTITATIVE STUDY USING SEMITHIN SECTION OF THE RAT FETAL MYOCARDIUM
Xavier-Vidal,Ricardo; Cunha,Rosely C.; Madi,Kalil;
Revista chilena de anatomía , 1997, DOI: 10.4067/S0716-98681997000200015
Abstract: during the embryonic development the heart is greatly dependent on the myocyte proliferation, which continues until the neonate. the myocardium regeneration during this period varies directly with the potential of cell proliferation. it is still debatable the proliferative and hypertrophic capacities of the myocardium from embryonic to perinatal period. five non-consanguineous rat fetuses at 18.5 and 20.5 days of gestation were utilized and fragments of the left ventricular wall were obtained, fixed and processed for routine electron microscopy. stereological estimation made in semithin sections were obtained using 10 random microscopical fields in each heart with m-42 test-system mounted in a nikon cfw eyepiece (10x) and with immersion objective (100x). qualitative electron microscopic study was performed. the results show the means of volumetric density values: a) myocytes (including nuclei) = 69.3%; b) the myocyte nuclei alone = 6.5%; c) connective tissue (including vessels) = 30.7%. the myocyte nuclei has a mean of surface density equal to 0.073 μm2/μm3. the mean of numerical density of nuclei was obtained utilizing disector's method and the value found was 2357160 /mm3. the diameter of myocyte nuclei, considering like a sphere was 3.7 μm3. the em presented myocytes well fixed with well-developed sarcomers disposed in an irregular form in the myocyte cytoplasm. the cardiac interstitium showed fibroblasts with characteristics of a great proteic synthesis. the volume of cardiomyocyte nuclei is smaller than that found in the humam myocardium during this period. there are differences in the numerical density of nuclei comparing rat and human. this article suggest binucleate cardiomyocyte during fetal period in rat as greater than was found in previous works
QUANTITATIVE STUDY USING SEMITHIN SECTION OF THE RAT FETAL MYOCARDIUM ESTUDIO CUANTITATIVO DEL MIOCARDIO UTILIZANDO SECCIONES FINAS DE FETO DE RATA
Ricardo Xavier-Vidal,Rosely C. Cunha,Kalil Madi
Revista chilena de anatomía , 1997,
Abstract: During the embryonic development the heart is greatly dependent on the myocyte proliferation, which continues until the neonate. The myocardium regeneration during this period varies directly with the potential of cell proliferation. It is still debatable the proliferative and hypertrophic capacities of the myocardium from embryonic to perinatal period. Five non-consanguineous rat fetuses at 18.5 and 20.5 days of gestation were utilized and fragments of the left ventricular wall were obtained, fixed and processed for routine electron microscopy. Stereological estimation made in semithin sections were obtained using 10 random microscopical fields in each heart with M-42 Test-System mounted in a Nikon CFW eyepiece (10X) and with immersion objective (100X). Qualitative electron microscopic study was performed. The results show the means of volumetric density values: a) Myocytes (including nuclei) = 69.3%; b) The Myocyte Nuclei alone = 6.5%; c) Connective Tissue (including vessels) = 30.7%. The Myocyte Nuclei has a mean of surface density equal to 0.073 μm2/μm3. The mean of numerical density of nuclei was obtained utilizing Disector's Method and the value found was 2357160 /mm3. The diameter of myocyte nuclei, considering like a sphere was 3.7 μm3. The EM presented myocytes well fixed with well-developed sarcomers disposed in an irregular form in the myocyte cytoplasm. The cardiac interstitium showed fibroblasts with characteristics of a great proteic synthesis. The volume of cardiomyocyte nuclei is smaller than that found in the humam myocardium during this period. There are differences in the numerical density of nuclei comparing rat and human. This article suggest binucleate cardiomyocyte during fetal period in rat as greater than was found in previous works Durante el desarrollo embrionario el corazón es muy dependiente de la proliferación de miocitos, la que continúa hasta el recién nacido. La regeneración del miocardio durante este período varía directamente con el potencial de proliferación celular. Es aún discutible las capacidades proliferativas e hipertróficas del miocardio desde el periodo embrionario al perinatal. Utilizamos 5 fetos de ratas no caonsanguíneos de 18,5 y 20,5 días de gestación , obteniéndose fragmentos de su pared ventricular izquierda, fijados y procesados para la microscopía de electrónica de rutina. Efectuamos la estimación estereológica en delgadas secciones, en cada corazón, que fue obtenida en 10 campos microscópicos escogidos al azar, con el Sistema test M-42 montada en un ocular Nikon CFW (10X) y con un objetivo de immersio
Multivariate allometry and myocardium abnormalities during experimental systemic nitric oxide blockage
Xavier-Vidal, Ricardo;Ramirez Carvajal, Santiago Segundo;Cunha, S?nia Baptista da;Madi, Kalil;
Jornal Brasileiro de Patologia e Medicina Laboratorial , 2004, DOI: 10.1590/S1676-24442004000300011
Abstract: using allometry to evaluate numerical data from normal and experimental hypertensive rats' myocardium, thirteen normotensive wistar male young rats were examined. hearts were processed using histological routine methods. for myocardial quantification we utilized an m-42 test-system. fifteen fields were randomly considered. parameters utilized: volumetric density (vv %); volume (v μm3) and cardiac weight. the c2 proposed by anderson and the f proposed by jolicoeur were utilized to test the isometric hypothesis in multivariate allometry. results in the first analysis show eigenvalues at first principal component with proportions of 70.11%. results concerning coefficients show v nuclei with a coefficient greater than the isometric point. in the second analysis, eigenvalues of first principal component show a proportion of 75.68%, using three variables. results of the second analysis show vv matrix with a coefficient greater than the isometric point. in the third analysis, eigenvalues of first principal component show a proportion of 70.18%, using three variables. results of the third analysis show v nuclei with a coefficient greater than the isometric point. this suggests that the nuclei of the myocytes have the major variance between the variables utilized. using c2 and f tests we rejected isometric hypothesis. then we can clearly identify the growth center advocated by huxley as the myocyte nuclei. in conclusion, the data show that under this experimental hypertension, myocytes undergo intense nuclear changes probably involving great metabolic activities. in other words, these data also suggested that, to researchers interested in l-name models on the 21st day of submission, it is important to emphasize cardiomyocyte nuclei and occurrences linked to them.
Modelagem da estabilidade de tratores agrícolas de pneus
Khoury Junior, Joseph Kalil;Dias, Gutemberg Pereira;Cordeiro, Ricardo Reis;Souza, Cristiano Márcio Alves de;
Pesquisa Agropecuária Brasileira , 2004, DOI: 10.1590/S0100-204X2004000500008
Abstract: the knowledge of the stability limit of tractors is fundamental to the safety of the agricultural operations in order to avoid accidents. the objective of this research was to develop a mathematical model to predict the loss of tractor stability. the model was verified under dynamic conditions on a standardized track, with no implement attached to the tractor. in order to predict the loss of tractor stability, the mathematical model was implemented based on the tractor geometry and weight and on some information about the tractor placement on the track. forces and momentum analyses were accomplished to determine the equations that describe the static and dynamic tractor behavior on sloping terrain. it was used a 4x2 tractor. comparing the experimental to the model estimated tractor-overturning angle, it was concluded that the developed model is capable to predict the stability loss.
Fatores preditivos de revers o a ritmo sinusal após interven o na valva mitral em pacientes com fibrila o atrial cr nica
MARATIA Claudia,KALIL Renato A. K,SANT'ANNA Jo?o Ricardo M,PRATES Paulo R
Revista Brasileira de Cirurgia Cardiovascular , 1997,
Abstract: Pacientes portadores de valvopatia mitral resultante de febre reumática podem exibir fibrila o atrial decorrente de altera es anat micas e funcionais da musculatura atrial esquerda. Quando a terapêutica da les o mitral requer corre o cirúrgica, observa-se, em alguns pacientes com fibrila o atrial, retorno ao ritmo sinusal. O objetivo do presente estudo foi o de identificar, em pacientes com valvopatia mitral e fibrila o atrial, variáveis capazes de prever o ritmo cardíaco após opera o corretiva. Realizamos, para este fim, um estudo retrospectivo das seguintes variáveis: idade, sexo, dura o da fibrila o atrial no pré-operatório, diametro do átrio esquerdo, fra o de eje o, diagnóstico da valvopatia, tipo de opera o empregada e presen a de opera o cardíaca prévia, a partir de: história clínica, eletrocardiograma, ecocardiograma e nota cirúrgica, presentes no prontuário de cada doente. Os resultados mostraram n o haver diferen a estatisticamente significativa entre o grupo com retorno ao ritmo sinusal e o grupo que permaneceu em fibrila o atrial para as seguintes variáveis: idade, sexo, dura o da fibrila o atrial, diametro de átrio esquerdo, fra o de eje o, tipo de opera o realizada e presen a de opera o cardíaca prévia. Os pacientes com insuficiência mitral e diametro de átrio esquerdo menor que 52 mm apresentaram maior chance de retorno para ritmo sunusal após opera o (OR = 1,945; p = 0,02). A identifica o de pacientes com elevada possibilidade de manuten o de fibrila o atrial, após a opera o para corre o de valvopatia mitral, torna o emprego de terapêutica cirúrgica, para a citada arritmia, procedimento a ser considerado na estratégia definida no pré-operatório. Excluindo-se aqueles com átrio esquerdo menor de 52 mm e insuficiência mitral, todos os demais casos com fibrila o atrial cr nica seriam candidatos a procedimentos específicos para revers o da arritmia.
Dupla amplia o anterior e posterior do anel aórtico para substitui o valvar
SANT′ANNA Jo?o Ricardo,KALIL Renato A. K.,PRATES Paulo R.,JUNGBLUT Carlos
Revista Brasileira de Cirurgia Cardiovascular , 2002,
Abstract: OBJETIVO: Apresentar técnica de dupla amplia o anterior e posterior do anel aórtico, que difere das previamente descritas por utilizar enxertos distintos, para implante de prótese valvar e avaliar os resultados obtidos em 26 pacientes. MéTODO: O procedimento é realizado com circula o extracorpórea convencional. Para substitui o de valva nativa ou prótese aórtica estenótica, amplia o anelar posterior decorre da incis o no ponto médio do seio n o coronário, que é estendida ao folheto mitral anterior; amplia o anterior resulta de incis o no anel aórtico anterior, estendida por 2 cm no septo interventricular, n o transfixado. Reconstru o aórtica (e amplia o anelar) é realizada mediante enxertos de pericárdio bovino distintos, sendo um triangular para incis o anterior e outro elíptico para incis o posterior. Após a fixa o da prótese (mecanica ou biológica), a aorta ascendente é suturada com auxílio destes enxertos. Defeitos cardíacos associados s o corrigidos. RESULTADOS: A opera o aumentou o diametro do anel aórtico de 18,0 + 2,6 mmHg para 24,5 + 2,1 mmHg (p<0,01). Na opera o, um paciente (3,8%) requereu revasculariza o miocárdica por obstru o dos óstios coronários. No período pós-operatório imediato um paciente foi reoperado por sangramento e outro faleceu por choque séptico (morbidade e mortalidade de 3,8%). Durante seguimento médio de 24 meses n o ocorreram óbitos ou reopera es, sendo observada melhora na classe funcional em 23 pacientes acompanhados por mais de 3 meses. Nos pacientes com estenose da valva ou prótese aórtica, o gradiente sistólico máximo ao ecocardiograma Doppler mostrou uma redu o de 87,3 + 20,8 mmHg, valor pré-operatório, para 25,9 + 10,3 mmHg (p < 0,01). CONCLUS O: A amplia o anterior e posterior mediante enxertos distintos resultou em aumento importante do anel aórtico e, estando associada com baixa mortalidade e morbidade, pode ser considerada nas obstru es severas da via de saída do ventrículo esquerdo ou para reconstru o anelar aórtica.
Page 1 /19445
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.