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Search Results: 1 - 10 of 12849 matches for " Ant?nio Dorival;Defino "
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Lordose lombar: estudo dos valores angulares e da participa??o dos corpos vertebrais e discos intervertebrais
Damasceno, Luiz Henrique Fonseca;Catarin, Silvio Ricardo Guarnieri;Campos, Antnio Dorival;Defino, Helton Luis Aparecido;
Acta Ortopédica Brasileira , 2006, DOI: 10.1590/S1413-78522006000400003
Abstract: the angular value of lumbar lordosis and the role of vertebral bodies and intervertebral discs in its constitution were studied in normal individuals. x-ray images of lumbar spine were studied in 350 normal and asymptomatic individuals, ages ranging from 18 to 50 years old (average 29.0 years old ± 8.24), being 143 males and 207 females. the lumbosacral (l1s1) and the lumbolumbar (l1l5) curves were measured. measurements for lumbar curves and their components presented a large variation. average values of -61o were seen for lumbosacral curve and of -45o for lumbolumbar curve. vertebral bodies measurements presented kyphotic values for l1, neutral for l2, and progressively lordotic for l3 - l5. intervertebral discs presented a progressive lordotic angulation from l1-l2. caudal elements of curvature, intervertebral discs l4-l5 and l5-s1 and the vertebral body l5 accounted for nearly 60% of the angular measurement of lumbosacral curvature. a significant difference was seen between males and females for lumbar curvature measurements, and for vertebral bodies l2 and l4, with females presenting higher values. age-related differences were found in lumbar curvature and vertebral bodies measurements.
Ensaios mecanicos de um sistema de fixa??o pedicular com barra transversal
Defino, Helton Luiz Aparecido;Shimano, Antnio Carlos;
Acta Ortopédica Brasileira , 2001, DOI: 10.1590/S1413-78522001000400002
Abstract: a biomechanical study of a spine fixation prototype was performed. this system uses vertebral pedicle as anchor point of the implants in association with transversally connecting rods. this is different form the usual systems where longitudinally placed rods connect the pedicular screws. mechanical assays were performed (flexo-compression, lateral flexion, torsion) using probe wood pieces in an universal testing machine, aiming to compare the resistance of this system of fixation to the conventionally used ones. biomechanical tests showed that the system was less resistant to the mechanical assays when compared to conventional systems.
Indirect calorimetry can be used to measure cardiac output in septic patients?
Martins, Maria Auxiliadora;Coletto, Francisco Antnio;Campos, Antnio Dorival;Basile-Filho, Anibal;
Acta Cirurgica Brasileira , 2008, DOI: 10.1590/S0102-86502008000700020
Abstract: purpose: the aim of this study was to compare two different cardiac output (co) monitoring systems based on the thermodilution principle (thermo-co) and indirect calorimetry (fick mixed-co) in septic patients. methods: prospective study in septic patients admitted in an intensive care unit of a university hospital. nineteen patients aged on average 45.4 ± 21.5 years were enrolled in the study. four series of hourly measurements by the two techniques were carried out simultaneously. results: no significant differences were observed between thermo-co and fick mixed-co (7.0 ± 1.8 l.min-1 and 6.4 ± 1.7 l.min-1.). parallel analysis of fick mixed-co and fick atrial-co was performed introducing a correction factor for the eight atrial samples in order to adjust the values of oxygen saturation obtained from atrial blood (fick corrected atrial-co) to those obtained from mixed venous blood. no significant differences could be detected between fick mixed-co and fick corrected atrial-co. the correlation coefficients of thermo co/fick mixed-co and fick mixed-co/fick corrected atrial-co were 0.84 and 0.94, respectively. conclusion: we observed that the agreement between the two methods was satisfactory on the basis of the decisions made for treatment. indirect calorimetry is useful to measure co in patients with septic shock.
Estudo da isquemia e reperfus?o em retalhos cutaneos de ratos
Freitas, Frederico Alonso Sabino de;Piccinato, Carlos Eli;Campos, Antnio Dorival;Cherri, Jesualdo;
Acta Cirurgica Brasileira , 2002, DOI: 10.1590/S0102-86502002000900016
Abstract: introduction: multiple factors have been implicated in the pathogenesis of reperfusion injury in the skin, including the reactive oxygen species. objective: the aim was to evaluate the effect of reperfusion injury in the rat skin flap evaluated by tissue assay for malonyldialdehyde (mda) and xanthine oxidase (xo). methods: 8 wistar rats were used, between 300-400g weight and two identical epigastric flaps were raised in each animal (control and experiment), the vasculature of one flap was left intact and in the second flap the arterial pedicle was clamped for 16 hours and reperfused for 45 minutes. skin samples were obtained from each flap after these periods of time and submitted to mda and xo analysis. results: reperfused flaps had significantly increased mda and xo values compared to the control flaps biopsies. conclusion: the lipid peroxidation levels were higher in the rat epigastric skin flaps subjected to 16 hours of ischemia and 45 minutes of reperfusion.
Functional evaluation of temporary focal cerebral ischemia: experimental model
Duarte, Sinésio Grace;Campos, Antnio Dorival;Colli, Benedicto Oscar;
Arquivos de Neuro-Psiquiatria , 2003, DOI: 10.1590/S0004-282X2003000500009
Abstract: objective: despite cerebral ischemia being a frequent clinical pathologic state, the tolerance of neural tissue to oxygen absence and to reperfusion is controversial. this study aims to evaluate the effects of focal cerebral ischemia/reperfusion, by analyzing the mitochondrial respiration. method: sixty-four adult rats underwent focal cerebral ischemia by middle cerebral artery occlusion, during 15, 30 and 60 minutes, followed by 10 minutes or 19 hours of reperfusion. the effects of ischemia were analyzed measuring the o2 consumption by mitochondria in the ischemic and non-ischemic areas. results: there was compromise of the mitochondrial respiration after 30 and 60 minutes of ischemia, followed by 10 minutes of reperfusion but there was no alteration in this function after 19 hours of reperfusion. conclusion: compromise of the mitochondrial function occurred after 30 minutes of ischemia but, until one hour of ischemia, if the reperfusion was prolonged there was no evidence of ischemic/reperfusion injuries.
Estudo da isquemia e reperfus o em retalhos cutaneos de ratos
Freitas Frederico Alonso Sabino de,Piccinato Carlos Eli,Campos Antnio Dorival,Cherri Jesualdo
Acta Cirurgica Brasileira , 2002,
Abstract: INTRODU O: Múltiplos fatores têm sido implicados na patogênese da les o de isquemia/reperfus o da pele, incluindo as espécies reativas de oxigênio. OBJETIVO: Estudar a les o de isquemia/reperfus o em retalhos cutaneos de ratos avaliando os níveis teciduais do malonildialdeído (MDA) e xantina oxidase (XO). MéTODOS: Foram utilizados 8 ratos Wistar, com peso entre 300 - 400g, sendo confeccionados 2 retalhos epigástricos por animal (controle e experimento), um deles submetido à 16h de isquemia (RI) seguida de 45 min de reperfus o (RR) e o outro controle (RC). Foram colhidas 3 biópsias de pele dos retalhos (RC, RI, RR) e encaminhadas para dosagem de MDA e XO. RESULTADOS: A análise bioquímica mostrou aumento significativo dos níveis teciduais de MDA e XO após a reperfus o em rela o aos retalhos controles. CONCLUS O: Retalhos epigástricos de ratos submetidos à 16h de isquemia e 45min de reperfus o apresentam eleva o dos níveis teciduais de MDA e XO, caracterizando a lipoperoxida o da membrana celular.
Functional evaluation of temporary focal cerebral ischemia: experimental model
Duarte Sinésio Grace,Campos Antnio Dorival,Colli Benedicto Oscar
Arquivos de Neuro-Psiquiatria , 2003,
Abstract: OBJECTIVE: Despite cerebral ischemia being a frequent clinical pathologic state, the tolerance of neural tissue to oxygen absence and to reperfusion is controversial. This study aims to evaluate the effects of focal cerebral ischemia/reperfusion, by analyzing the mitochondrial respiration. METHOD: Sixty-four adult rats underwent focal cerebral ischemia by middle cerebral artery occlusion, during 15, 30 and 60 minutes, followed by 10 minutes or 19 hours of reperfusion. The effects of ischemia were analyzed measuring the O2 consumption by mitochondria in the ischemic and non-ischemic areas. RESULTS: There was compromise of the mitochondrial respiration after 30 and 60 minutes of ischemia, followed by 10 minutes of reperfusion but there was no alteration in this function after 19 hours of reperfusion. CONCLUSION: Compromise of the mitochondrial function occurred after 30 minutes of ischemia but, until one hour of ischemia, if the reperfusion was prolonged there was no evidence of ischemic/reperfusion injuries.
Estudo da influência do modo de prepara??o do orifício piloto e do macheamento na ancoragem dos parafusos pediculares
Defino, Helton Luiz Aparecido;Vendrame, José Roberto Benites;Shimano, Antnio Carlos;Kandziora, Frank;
Acta Ortopédica Brasileira , 2007, DOI: 10.1590/S1413-78522007000400005
Abstract: mechanical assays were performed with screws of the usis vertebral fixation system for the study of the influence of type of pilot hole preparation with probe or burr and tapping of the pilot hole pathway on pedicular screw pullout. the screws were inserted into wood, polyurethane and bovine bone test bodies. the pilot hole was prepared with probes and burrs of 3.5 mm. three experimental groups were formed: i -drilling with a probe, ii - drilling with a burr, and iii - drilling with burr and tapping. after screw insertion into the test bodies, pullout assays were performed with a universal test machine. increased screw pullout resistance was observed when the pilot hole was drilled with a probe, with a statistically significant difference compared to preparation with a burr and with a burr in combination with tapping. no difference in screw pullout resistance was observed with tapping of the pilot hole pathway.
Estudo experimental do sequenciamento das manobras da ligamentotaxia na descompress?o do canal vertebral
Castro, Ilton José Carrilho de;Shimano, Antnio Carlos;Bellucci, Angela Delete;Defino, Helton Luiz Aparecido;
Acta Ortopédica Brasileira , 2008, DOI: 10.1590/S1413-78522008000500008
Abstract: vertebral canal decompression, intended to provide relief to nervous structures, may be performed by means of legamentotaxis. the objective of this study was to assess the influence of the ligamentotaxis sequence on vertebral canal decompression. vertebral segments of landrace swine specimens were used. a device especially developed for producing a burst-type fracture was employed. subsequently to the computerized tomography scan, 10 specimens that best showed a burst-type fracture were fixated with internal fixator (synthes). two groups were formed. on the first group (n=5), lordosis followed by distraction were performed. then, they were submitted to distraction and lordosis. on the second group (n=5), distraction was provided first, and then lordosis was performed. after each maneuver, vertebral canal was measured by tomography scan. fractured vertebral body fragments were measured and compared using the student's t test (p<0,05). by comparing dislocations between groups, no statistical differences were found (p<0,06). this result is close to the significance level adopted, suggesting a strong trend towards a better effectiveness of the maneuver started with lordosis.
Estudo da influência do diametro do orifício piloto na resistência ao arrancamento do parafuso pedicular
Vendrame, José Roberto Benites;Shimano, Antnio Carlos;Kandziora, Frank;Defino, Helton Luiz Aparecido;
Acta Ortopédica Brasileira , 2008, DOI: 10.1590/S1413-78522008000200001
Abstract: the influence of the diameter of the pilot hole compared to the inner diameter of the screw on the pull-out resistance of a pedicular screw was studied. 5-, 6-, and 7-mm uss system screws for vertebral fixation were inserted into wood, polyurethane and bone test bodies. the pilot hole for screw insertion was drilled with burrs of smaller, equal or wider diameter than the inner diameter of the screw. mechanical pull-out assays were performed using a universal testing machine. in the wood, polyurethane and bone test bodies, a pilot hole drilled with burrs of a wider diameter than the inner diameter of the screw produced reduced maximum pull-out strength on the implants, with statistical significance. the drilling diameter of the pilot hole compared to the inner diameter of the screw influences implant pull-out strength, with an increased pull-out resistance being observed with the use of smaller diameter burrs as compared to the inner diameter, and a reduction of pull-out resistance being observed with the use of burrs of a wider diameter than the inner diameter of the screw.
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