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Search Results: 1 - 10 of 368 matches for " Cattan Jacobo Melamed "
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Prevalência de deficiência visual de perto e fatores associados: um estudo de base populacional
Duarte, Wladimir Ribeiro;Barros, Aluísio J. D.;Dias-da-Costa, Juvenal Soares;Cattan, Jacobo Melamed;
Cadernos de Saúde Pública , 2003, DOI: 10.1590/S0102-311X2003000200022
Abstract: the objective of this article was to estimate the prevalence of presbyopia in adults 3 30 years and explore associated characteristics such as demographic, socioeconomic, and individual variables. a cross-sectional, population-based study was performed with 3,007 adults 3 30 years in pelotas, rio grande do sul, brazil. near vision acuity was evaluated using the jaeger table, and other variables were investigated using standardized, pre-coded questionnaires. prevalence of presbyopia was 54.7%. when visual acuity was measured using visual corrective means, prevalence was 29.34%. age and female gender were associated with the outcome variable after controlling for confounding. some 42.4% of the sample reported not requiring near vision for routine daily tasks. the conclusion was that presbyopia displays a high prevalence in the adult population and is directly related to increasing age, especially 45 years of age and appearing earlier in women. in some 30% of individuals who already use visual corrective means, the latter are ineffective for near vision.
Prevalência de deficiência visual de perto e fatores associados: um estudo de base populacional
Duarte Wladimir Ribeiro,Barros Aluísio J. D.,Dias-da-Costa Juvenal Soares,Cattan Jacobo Melamed
Cadernos de Saúde Pública , 2003,
Abstract: Este artigo teve como objetivo estimar a prevalência de presbiopia em adultos com trinta anos ou mais e explorar características associadas, como variáveis demográficas, sócio-econ micas e individuais. Realizou-se um estudo transversal de base populacional com 3.007 adultos acima de trinta anos em Pelotas, Rio Grande do Sul, Brasil. Avaliou-se a acuidade visual para perto com a tabela de Jaeger e as outras variáveis foram investigadas através de questionários padronizados e pré-codificados. Encontrou-se uma prevalência de 54,7% de presbiopia na amostra estudada. Quando a acuidade visual foi medida utilizando meios de corre o visual, a prevalência encontrada foi de 29,3%. As variáveis idade e sexo feminino se mostraram associadas com o desfecho, controlando-se para fatores de confus o. Cerca de 42,4% da amostra referiram n o necessitar da vis o de perto nas suas tarefas habituais. Concluiu-se que a presbiopia tem elevada prevalência na popula o adulta e se relaciona diretamente com o aumento da idade (especialmente após os 45 anos) manifestando-se mais precocemente nas mulheres. Em 30% dos usuários de corre o visual a mesma n o é adequada para vis o de perto.
Altera??es tomográficas cerebrais em crian?as com les?es oculares por toxoplasmose congênita
Melamed, Jacobo;Dornelles, Fábio;Eckert, Gabriela U.;
Jornal de Pediatria , 2001, DOI: 10.1590/S0021-75572001000600010
Abstract: objective: to evaluate the frequency and the types of cerebral ct scan alterations in patients with ocular lesions caused by congenital toxoplasmosis. methods: the patients should fit one of the following criteria: reagent igm serology for toxoplasmosis at birth and mother with positive serology for toxoplasmosis; age less than ten years, with bilateral funduscopic lesions compatible with toxoplasmic retinochoroiditis; or reagent igg serology for toxoplasmosis and mother with positive serology for toxoplasmosis. all patients were submitted to noncontrast cerebral ct scan. results: twenty-two patients participated in this study (44 eyes). thirteen eyes presented macular lesions (29.5%), eight had peripheral lesions (18.2%) and 22 eyes had concomitant macular and peripheral lesions (50%). seventeen patients presented radiological alterations (77.3%). among these, sixteen patients (94.1%) presented brain calcifications, two patients (11.7%) presented ventricular dilation, two patients (11.7%) had hydrocephalus, one had hydranencephaly (5.9%), one presented porencephalic cyst (cerebral hemiatrophy) (5.9%), one had arachnoid cyst (5.9%) and one had mild dilation of ventricles and subarachnoid cistern (5.9%). conclusions: patients diagnosed with congenital toxoplasmosis and ocular lesions should be investigated for concomitant neuroradiologic alterations.
Glaucoma bilateral por fechamento angular induzido por sulfametoxazol-trimetoprima: relato de caso
Spadoni, Viviane Souto;Pizzol, Melissa Manfroi Dal;Muniz, Carlos Henrique Gervini;Melamed, Jacobo;Fortes Filho, Jo?o Borges;
Arquivos Brasileiros de Oftalmologia , 2007, DOI: 10.1590/S0004-27492007000300023
Abstract: sulfamethoxazole-trimethoprim (cotrimoxazole) is an antibiotic combination widely used for infections treatment and prophylaxis. these and others sulfonamides have been implicated in a rare syndrome of choroidal effusion with transient myopia and angle-closure glaucoma. previous cases reported in literature evolved to complete resolution after drug withdrawal. in contrast, we describe a rare case in which a patient developed the syndrome while taking cotrimoxazole, but did not recover visual acuity. a 49-year-old man started pneumocystis carini prophylaxis with cotrimoxazole; four days later, the patient presented severe ocular pain, hyperemia and chemosis. intraocular pressure reached more than 50 mmhg in both eyes a 360° choroidal effusion occurred. medication was removed soon after the diagnosis was suspected and intraocular pressure decreased in four days. even so total cataract and phthisis bulbi occurred in both eyes two months later. this would be the first case in the literature in which the outcome was unfavorable despite early diagnosis and withdrawal of the drug.
Aderência in vitro do Staphylococcus epidermidis e da Pseudomonas alcaligenes em lentes intra-oculares
Gus, Patrícia Ioschpe;Melamed, Jacobo;Barth, Afonso;Sudhaus, Berno Dieter;Quinto, Guilherme;Matos, Guilherme Herrmann;Bayer, Marcia Cristina;
Arquivos Brasileiros de Oftalmologia , 2006, DOI: 10.1590/S0004-27492006000300009
Abstract: purpose: to quantify and compare the in vitro adherence of staphylococcus epidermidis and pseudomonas alcaligenes to different intraocular lenses (iols). methods: fourteen intraocular lenses were used in the experiment. four of polymethylmethacrylate (pmma), four of silicone, four of hidrogel and two of acrylic. eight intraocular lenses were placed in eight test tubes containing 4 ml of pseudomonas alcaligenes suspension, and six intraocular lenses were placed in six test tubes containing 4 ml of staphylococcus epidermidis suspension. the bacterial suspension used for adherence tests was 108 colony-forming units per milliliter (cfu/ml) which corresponds to 0.5 in the scale of mcfarland. the lenses were incubated at 37° for two hours. after this, intraocular lenses were removed from the test tubes and dried twice with the use of distilled and sterile water. the material was spread on blood-agar for cultivation at 35-37°c and was evaluated every 24 hours up to 72 hours. in the samples where there was bacterial growth, the colonies were counted using the conventional laboratory methods. all assays were performed in duplicate. results: adherence of staphylococcus epidermidis to pmma intraocular lenses was lower than to hydrogel and silicone intraocular lenses. adherence of pseudomonas alcaligenes to hydrogel intraocular lenses was lower than to pmma, acrylic and silicone intraocular lenses. conclusions: results suggest that in vitro adherence of staphylococcus epidermidis and pseudomonas alcaligenes to intraocular lenses is influenced by type of material of the lens and by microorganism species. bacterial adherence may play a role in the pathogenesis of some forms of endophthalmitis after cataract surgery. more in vitro and clinical studies are necessary to elucidate the mechanisms by which staphylococcus epidermidis and pseudomonas alcaligenes cause endophthalmitis.
Pernicious anemia: What are the actual diagnosis criteria?
Daniel Cattan
World Journal of Gastroenterology , 2011,
Abstract: A gastric intrinsic factor output under 200 U/h after pentagastrin stimulation (N > 2000 U/h) is specific for pernicious anemia. The other findings are either variable or non specific. Serum intrinsic factor antibodies, considered as specific in general practice, are present only in half of the patients with pernicious anemia. In their absence, since the disappearance of the Schilling tests, the gastric tubage currently used for the study of gastric acid secretion, is obligatory for the simultaneous study of intrinsic factor output. This study is important to eliminate another disease much more frequent than pernicious anemia, the protein bound to cobalamin malabsorption was observed in achlorhydric simple atrophic gastritis in the presence of intrinsic factor secretion.
Contributions to the history of ocular toxoplasmosis in Southern Brazil
Melamed, J;
Memórias do Instituto Oswaldo Cruz , 2009, DOI: 10.1590/S0074-02762009000200032
Abstract: the evolution of knowledge regarding ocular toxoplasmosis over the last 30 years is described based on studies and observations performed in southern brazil. the isolation oftoxoplasma gondii established the definitive diagnosis of the disease. it was proven that in most cases, the disease was acquired after birth, a concept supported by the description of numerous familial cases and observation of the disease many years after primary infection. epidemiological studies showed important regional variations in the prevalence of the disease due to different factors, including the types of strains involved, of which type i predominates. the large number of patients also enabled detailed study of the different forms of clinical presentation of the disease and its complications. new parameters have been established for the use of steroids and the management of pregnant women with active lesions. studies on the epidemiology of toxoplasmic infection in pregnant women and newborns showed a high prevalence of infection. the different factors of exposure to infection have also been studied. gradually, preventive actions have been developed in the sphere of public health, although they have not been sufficiently effective. trends for future research over the next few years are also outlined.
Pulsed Beam Expansion of Electromagnetic Aperture Fields
Timor Melamed
PIER , 2011, DOI: 10.2528/PIER11012001
Abstract: The present contribution is concerned with an exact frame-based pulsed-beams expansion of planar aperture time-dependent electromagnetic fields. The propagating field is described as a discrete superposition of tilted, shifted and delayed electromagnetic pulsed-beam waveobjects over the frame spectral lattice. Explicit asymptotic expressions for the electromagnetic pulsed-beam propagators are obtained for the commonly used pulsed-quadratic windows.
The empirical TES methodology: modeling empirical time series
Benjamin Melamed
International Journal of Stochastic Analysis , 1997, DOI: 10.1155/s1048953397000403
Abstract: TES (Transform-Expand-Sample) is a versatile class of stochastic sequences defined via an autoregressive scheme with modulo-1 reduction and additional transformations. The scope of TES encompasses a wide variety of sample path behaviors, which in turn give rise to autocorrelation functions with diverse functional forms - monotone, oscillatory, alternating, and others. TES sequences are readily generated on a computer, and their autocorrelation functions can be numerically computed from accurate analytical formulas at a modest computational cost.
Community Structures in Bipartite Networks: A Dual-Projection Approach
David Melamed
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0097823
Abstract: Identifying communities or clusters in networked systems has received much attention across the physical and social sciences. Most of this work focuses on single layer or one-mode networks, including social networks between people or hyperlinks between websites. Multilayer or multi-mode networks, such as affiliation networks linking people to organizations, receive much less attention in this literature. Common strategies for discovering the community structure of multi-mode networks identify the communities of each mode simultaneously. Here I show that this combined approach is ineffective at discovering community structures when there are an unequal number of communities between the modes of a multi-mode network. I propose a dual-projection alternative for detecting communities in multi-mode networks that overcomes this shortcoming. The evaluation of synthetic networks with known community structures reveals that the dual-projection approach outperforms the combined approach when there are a different number of communities in the various modes. At the same time, results show that the dual-projection approach is as effective as the combined strategy when the number of communities is the same between the modes.
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