Database : LILACS
Search on : D02.033.100.291.211 [DeCS Category]
References found : 37 [refine]
Displaying: 1 .. 10   in format [Large]

page 1 of 4 go to page            

  1 / 37 LILACS  
              next record last record
select
to print
Photocopy
Full text
Id: biblio-1048549
Author: Collaud, Carlos; Musumeci, Martina; Mollerach, Ana; Arma, Irene; Hume, Isabel; Cianciarelli, Constanza; Vázquez, Eliana; Galich, Ana María; Diehl, María; Guelman, Rodolfo; Kitaidgrosky, Ariela; Buttazzon, Mirena; Biedak, Pablo; Schonfeld, Mariela; Figari, Marcelo; Jager, Víctor.
Title: Utilidad de la 18f-colina pet/tc en hiperparatiroidismo primario persistente o recurrente: experiencia inicial / Usefulness of 18f-choline pet / tc in persistent or recurrent primary hyperparathyroidism: initial experience
Source: Actual. osteol;15(1):11-19, ene. abr. 2019. tab., ilus..
Language: es.
Abstract: El hiperparatiroidismo persistente/recurrente representa un desafío en la localización del tejido paratiroideo hiperfuncionante. En esta subpoblación, los métodos convencionales ofrecen un menor rédito diagnóstico. La 18F-colina PET/TC podría ser una buena alternativa dada su mejor resolución espacial, capacidad de detectar glándulas ectópicas y la conjunción de la imagen molecular y anatómica. Sin embargo, la evidencia en este subgrupo de pacientes es escasa. Objetivo: evaluar la utilidad de la 18F-colina PET/TC como método de localización en el hiperparatiroidismo persistente o recurrente. Materiales y métodos: se analizaron los pacientes con 18F-colina PET/TC para hiperparatiroidismo entre diciembre de 2015 y enero de 2018 en un centro terciario de alto volumen. Se analizaron el número de lesiones, su localización, tamaño y el Standard Uptake Value máximo (SUV max) en las imágenes tempranas y tardías. Se compararon los resultados con los métodos convencionales. Resultados: 7 de 15 pacientes habían sido operados previamente (persistentes/recurrentes). La 18F-colina PET/TC detectó 6/7 casos (83,33%), la ecografía cervical 1/4 (25%) y el SPECT de paratiroides y la resonancia nuclear magnética 2/5 (40%). El SUV max obtenido fue variable, en la mitad de los casos a los 10 minutos y en los restantes a la hora; el tamaño promedio de las lesiones fue 8,61 mm (6-12 mm). Conclusiones: la 18F-colina PET/TC muestra una alta tasa de detección en los pacientes con hiperparatiroidismo persistente/recurrente. La combinación del comportamiento biológico del PET con los hallazgos morfológicos aportados por la TC con contraste endovenoso le ofrecería ventajas sobre otros estudios que podrían posicionarlo como método de primera línea en esta subpoblación. (AU)

Persistent or recurrent hyperparathyroidism represents a challenge regarding the localization of the hyper-functioning parathyroid tissue. In this subpopulation of hyperpharathyroid patients, conventional methods have a low diagnostic yield. The 18F-choline PET /CT could be a good alternative given its better spatial resolution, ability to detect ectopic glands, and the conjunction of the molecular and anatomical image. However, the evidence in this subgroup of patients is limited. Objective: to evaluate the utility of 18F-choline PET/ CT as a localization method in persistent or recurrent hyperparathyroidism. Materials and methods: patients with 18F-choline PET / CT for hyperparathyroidism between December 2015 and January 2018 in a high-volume tertiary center were included. The number of lesions, and their location, size, and maximum Standard Uptake Value (SUV) in the early and late images were analyzed. The results were compared to conventional methods. Results: 7 of 15 patients had been previously operated (persistent/recurrent). 18F-choline PET / CT detected 6/7 cases (83,33%), cervical ultrasound 1/4 (25%) and parathyroid SPECT and magnetic resonance 2/5 (40%). The maximum SUV was variable, one half at 10 minutes and the other half at 60 minutes; the average size of the lesions was 8.61 mm (6-12 mm). Conclusions: 18F-Choline PET / CT shows a high detection rate in patients with persistent / recurrent hyperparathyroidism. The combination of the biological behavior of PET with the morphological findings provided by CT with intravenous contrast would offer advantages over other studies that could position it as a first line method in this subpopulation. (AU)
Responsable: AR2.1 - Biblioteca Central


  2 / 37 LILACS  
              first record previous record next record last record
select
to print
Photocopy
SciELO Brazil full text
Full text
Full text
Id: biblio-827946
Author: Aires, A. R; Rocha, X. R; Torbitz, V. D; Moresco, R; Sousa, R. S; Severo, S. L. S; Naibo, W; Sossanovicz, R. A; Pretto, A; Ortolani, E. L; Leal, M. L. R.
Title: Efeito da suplementação com colina protegida sobre parâmetros bioquímicos, produção e reprodução de vacas leiteiras no periparto / Effect of protected choline supplementation on biochemical parameters, production, and reproduction of dairy cows in peripartum
Source: Arq. bras. med. vet. zootec;68(6):1573-1580, nov.-dez. 2016. tab, graf.
Language: pt.
Abstract: Avaliou-se o efeito da suplementação com colina protegida sobre o perfil energético, as enzimas hepáticas e a reprodução de vacas leiteiras no periparto. Quinze vacas leiteiras foram divididas em dois grupos experimentais: oito receberam 80 gramas de colina protegida por 21 dias no pré-parto e por 40 dias no pós-parto e sete foram consideradas controle. Amostras de sangue foram coletadas nos dias 10, 20, 30 e 60 pós-parto para avaliação dos perfis energético e hepático. Aos 60 dias pós-parto, realizou-se exame ginecológico dos animais para avaliação da saúde reprodutiva. A suplementação com colina protegida não alterou os níveis de beta-hidroxibutirato (BHBA), ácidos graxos não esterificados (AGNE), frutosamina, fator de crescimento semelhante a glicose I (IGF-I), status oxidante total (TOS), aspartato aminotransferase (AST) e gamaglutamiltransferase (GGT) no pós-parto. Não houve diferença também quanto à produção de leite. Aos 60 dias pós-parto, vacas suplementadas com colina protegida apresentaram menor número de casos de endometrite que vacas do grupo controle. A suplementação de colina protegida não alterou o perfil bioquímico e a produção de leite, mas reduziu o número de casos de endometrite no pós-parto de vacas leiteiras.(AU)

The study aimed to evaluate the effect of supplementation with protected choline on the energy profile, liver enzymes and reproduction in dairy cows in peripartum. Fifteen cows were divided into two groups: 8 received 80 grams of protected choline for 21 days pre-partum and 40 days postpartum, and 7 were considered control. Blood samples were collected on days 10, 20, 30, and 60 postpartum to evaluate the energy and hepatic profiles. After 60 days postpartum a gynecological examination of animals for evaluation of reproductive health was done. The supplementation with choline protected did not alter the beta-hydroxybutyrate levels (BHBA), non-esterified fatty acids (NEFA), fructosamine, like growth factor glucose (IGF-I), total oxidant status (TOS), aspartate aminotransferase (AST) and glutamiltrasferase range (GGT) postpartum. There was no difference in milk production. After 60 days postpartum, cows fed protected choline had fewer cases of endometritis that cows in the control group. The protected choline supplementation did not alter the biochemical profile and milk production, but reduced the number of endometritis cases in postpartum dairy cows.(AU)
Responsable: BR1.1 - BIREME


  3 / 37 LILACS  
              first record previous record next record last record
select
to print
Photocopy
Full text
Full text
Id: lil-762190
Author: Lopes, Raíssa do Vale Cardoso; Castro, Michelle Alessandra de; Baltar, Valéria Troncoso.
Title: Betaína e Colina dietéticas relacionadas à homocisteína plasmática: estudo de base populacional, São Paulo, Brasil / Betaine and Choline Intakes are related to total plasma homocysteine: health survey of São Paulo, Brazil
Source: Int. j. cardiovasc. sci. (Impr.);28(1):61-69, jan.-fev. 2015. tab.
Language: pt.
Abstract: Fundamentos: Elevadas concentrações de homocisteína plasmática (Hcyp) têm sido associadas ao risco aumentado de doenças cardiovasculares. A Hcyp pode ser diminuída por meio da remetilação à metionina, que usa folato ou betaína como doador do grupo metil.Objetivos: Avaliar a ingestão de betaína e colina e sua relação com a homocisteína em residentes do município de São Paulo. Métodos: Obtidos dados de 584 indivíduos, de ambos os sexos, a partir do estudo de base populacional ISA-SP 2008. Médias geométricas de Hcyp foram analisadas de acordo com tercis de ingestão de colina e betaína e foi aplicado teste de tendência.Resultados: Foram analisados 584 indivíduos: 222 (38,0%) homens e 362 (62,0%) mulheres, com média de idade 55,0±19,0 anos. A prevalência de hiper-homocisteinemia foi maior entre os homens (28,0%), idosos (21,0%) e indivíduos com menor renda familiar (21,0%). Cerca de 31,0% dos indivíduos com hiper-homocisteinemia apresentou deficiência de folato (<7,5 nmol/L) e 26,0%, deficiência de vitamina B12 (<200 pmol/L). Observou-se diminuição nas médias geométricas de homocisteína conforme aumento nos tercis de betaína em ambos os sexos,adultos, eutróficos e em todas as categorias de escolaridade. A colina esteve relacionada à Hcyp em ambos os sexos, indivíduos de maior renda familiar, não fumantes e consumidores de bebidas alcoólicas. Conclusões: Este estudo sugere a importância da ingestão de betaína por sua associação inversa com a concentração de Hcyp em adultos e idosos do município de São Paulo. A colina desempenhou papel protetor em subgrupos específicos da população.

Background: High concentrations of plasma homocysteine (Hcyp) have been associated with increased risk of cardiovascular diseases. Hcyp can be decreased by remethylation to methionine, which uses folate or betaine as a donor of the methyl group. Objectives: To evaluate the intake of betaine and choline and its relation to homocysteine in residents of the city of São Paulo. Methods: Data from 584 individual, of both sexes, from the population-based study ISA-SP 2008. Geometric averages of Hcyp were analyzed according to choline and betaine intake tertiles and trend test was applied. Results: The study analyzed 584 individuals: 222 (38.0%) men and 362 (62.0%) women, mean age 55.0 ± 19.0 years. The prevalence of hyperhomocysteinemia was higher among men (28.0%), the elderly (21.0%) and those with lower household income (21.0%). Approximately 31.0% of individual with hyperhomocysteinemia presented folate deficiency (<7.5 nmol/L) and 26.0% presented vitamin B12 deficiency (<200 pmol/L). There was a decrease in the geometric means of homocysteine according to an increase in betaine tertiles in both sexes, adults, normal and in all categories of education. Choline was related to Hcyp in both sexes, higherhousehold income individuals, non-smokers and alcohol consumers. Conclusions: This study suggests the importance of betaine intake due to its inverse relationship with the concentration of Hcyp in adults and elderly in the city of São Paulo. Choline played a protective role in specific subgroups of the population.
Responsable: BR44.1 - Serviço de Biblioteca, Documentação Científica e Didática Prof. Dr. Luiz Venere Décourt


  4 / 37 LILACS  
              first record previous record next record last record
select
to print
Photocopy
SciELO Public Health full text
Full text
Id: lil-733303
Author: Samet, Jonathan M.
Title: Some current challenges in research on air pollution and health / Desafíos actuales de la investigación sobre contaminación del aire y salud
Source: Salud pública Méx;56(4):379-385, jul.-ago. 2014. ilus, tab.
Language: en.
Abstract: This commentary addresses some of the diverse questions of current interest with regard to the health effects of air pollution, including exposure-response relationships, toxicity of inhaled particles and risks to health, multipollutant mixtures, traffic-related pollution, accountability research, and issues with susceptibility and vulnerability. It considers the challenges posed to researchers as they attempt to provide useful evidence for policy-makers relevant to these issues. This commentary accompanies papers giving the results from the ESCALA project, a multi-city study in Latin America that has an overall goal of providing policy-relevant results. While progress has been made in improving air quality, driven by epidemiological evidence that air pollution is adversely affecting public health, the research questions have become more subtle and challenging as levels of air pollution dropped. More research is still needed, but also novel methods and approaches to address these new questions.

Este comentario aborda algunos de los temas de interés actual en relación con los efectos de la contaminación del aire sobre la salud, tales como las relaciones exposición-respuesta, la toxicidad y riesgos para la salud de las partículas inhaladas, las mezclas de contaminantes múltiples, la contaminación relacionada con el tráfico, la investigación sobre responsabilidad, y los problemas de susceptibilidad y vulnerabilidad. Considera los retos que se presentan a los investigadores que intentan proporcionar evidencia para los responsables políticos en estas cuestiones. Este texto acompaña otros trabajos con resultados del proyecto ESCALA, un estudio en varias ciudades de América Latina que tiene como objetivo general proporcionar resultados relevantes para la política pública. Aunque ha habido avances para mejorar la calidad del aire, gracias a la evidencia epidemiológica de que la contaminación aérea está afectando negativamente a la salud pública, las preguntas de investigación se han vuelto más sutiles y difíciles a medida que los niveles de contaminación se reducen. Se necesita más investigación, pero también nuevos métodos y enfoques capaces de enfrentar estas preguntas.
Responsable: BR1.1 - BIREME


  5 / 37 LILACS  
              first record previous record next record last record
select
to print
Photocopy
SciELO Brazil full text
Full text
Id: lil-732249
Author: Alves, La-Salete; Aragão, Irene; Sousa, Maria-José Carneiro; Gomes, Ernestina.
Title: Pattern of Maxillofacial Fractures in Severe Multiple Trauma Patients: A 7-year Prospective Study
Source: Braz. dent. j;25(6):561-564, Nov-Dec/2014. tab.
Language: en.
Abstract: The incidence of facial trauma is high. This study has the primary objective of documenting and cataloging maxillofacial fractures in polytrauma patients. From a total of 1229 multiple trauma cases treated at the Emergency Room of the Santo Antonio Hospital - Oporto Hospital Center, Portugal, between August 2001 and December 2007, 251 patients had facial wounds and 209 had maxillofacial fractures. Aged ranged form 13 to 86 years. The applied selective method was based on the presence of facial wound with Abbreviated Injury Scale ≥1. Men had a higher incidence of maxillofacial fractures among multiple trauma patients (86.6%) and road traffic accidents were the primary cause of injuries (69.38%). Nasoorbitoethmoid complex was the most affected region (67.46%) followed by the maxilla (57.42%). The pattern and presentation of maxillofacial fractures had been studied in many parts of the world with varying results. Severe multiple trauma patients had different patterns of maxillofacial injuries. The number of maxillofacial trauma is on the rise worldwide as well as the incidence of associated sequelae. Maxillofacial fractures on multiple trauma patients were more frequent among males and in road traffic crashes. Knowing such data is elementary. The society should have a key role in the awareness of individuals and in prevention of road traffic accidents.

É alta a incidência de traumas na face. Este estudo teve por objetivo documentar e catalogar as fraturas maxilofaciais em pacientes com politraumatismos. De um total de 1229 casos de politraumatizados tratados na Sala de Emergência do Hospital de Santo António - Centro Hospitalar do Porto, Portugal, entre Agosto de 2001 e Dezembro de 2007, 251 pacientes tiveram ferimentos na face e 209 apresentaram fraturas maxilofaciais. As idades variaram de 13 a 86 anos. O método de seleção baseou-se na presença de ferimentos na face com Abreviated Injury Scale ≥1. Os homens apresentaram maior incidência de fraturas maxilofaciais (86,6%) entre os pacientes com múltiplos traumatismos na face e os acidentes de trânsito foram a causa principal dos traumatismos (69,38%). A região mais afetada foi o complexo naso-órbito-etmoidal (67,46%), seguido pela maxila (57,42%). O padrão e a apresentação das fraturas maxilofaciais tem sido estudado em muitas regiões do mundo com resultados variados. Pacientes com politraumatizados graves apresentaram padrões diferentes de traumatismos maxilofaciais. O número de traumatismos maxilofaciais tem aumentado à escala mundial, assim como a incidência das sequelas associadas. Entre os pacientes com traumatismos múltiplos, a maioria pertencia ao sexo masculino, assim como a causa mais frequente foram os acidentes automobilísticos. É elementar o conhecimento destes dados. A sociedade tem um papel primordial nos cuidados individuais e na prevenção dos acidentes de trânsito.
Responsable: BR1.1 - BIREME


  6 / 37 LILACS  
              first record previous record next record last record
select
to print
Photocopy
SciELO Brazil full text
Full text
Id: lil-696869
Author: Pompeu, M A; Baião, N C; Lara, L J C; Ecco, R; Rocha, J S R; Fernandes, M N S; Barbosa, V M; Miranda, D J A.
Title: Suplementação de colina em dietas para frangos de corte machos em fase de crescimento / Choline supplementation in diets for male broilers in the growing phase
Source: Arq. bras. med. vet. zootec;65(6):1836-1842, Dec. 2013. graf, tab.
Language: pt.
Abstract: Avaliaram-se os efeitos dos níveis de suplementação de colina em dietas para frangos de corte, de 22 a 40 dias de idade, sobre o desempenho, a composição de carcaças e fígados, bem como as características macroscópicas e histopatológicas dos fígados. O período de criação foi de um a 40 dias de idade, sendo que o período experimental foi de 22 a 40 dias de idade. Até o 21º dia de idade, todas as aves receberam a mesma ração à qual foram adicionados 400mg colina/kg. No 22º dia, os frangos foram distribuídos em cinco tratamentos, nos quais os níveis testados de suplementação de colina foram: zero, 400, 800, 1.200 e 1.600mg/kg, com seis repetições de 30 aves cada. As rações experimentais, formuladas à base de milho, farelo de soja e farinha de carne/ossos, foram isonutritivas, com exceção dos níveis de colina. O delineamento experimental foi o inteiramente ao acaso, e a estimativa da suplementação de colina foi avaliada pelos modelos de regressão. Os níveis de suplementação de colina apresentaram efeito linear pelo teste F (P<0,05) para o consumo de ração. Os demais parâmetros avaliados não sofreram influência da suplementação (P>0,05). O nível de 1.600mg colina/kg de ração resulta em maior consumo de ração de frangos de corte aos 40 dias de idade.

The effects of choline supplemental levels were evaluated in diets for broilers on performance, carcass and liver composition and liver histopathology characteristics from 22 to 40 days-old. The period of creation was one to 40 days of age, and the experimental period was 22 to 40 days-old. Until 21 days of age all birds received the same diet added to 400mg choline/kg. On day 22, broilers were allotted to five treatments (zero, 400, 800, 1200 and 1600 mg/kg), with six repetitions of 30 birds each. The experimental diets formulated based on corn, soybean meal and meat/bones meal were isonutritive, except for the choline levels. The experimental design was completely randomized and the estimation of choline supplementation was evaluated by regression models. The levels of choline supplementation showed a significant linear effect for the F test (P<0.05) for feed intake. The other evaluated parameters were not influenced by supplementation (P>0.05). The supplementation of 1600mg choline/kg in the diet results in higher feed intake of broilers at 40 days old.
Responsable: BR68.1 - Biblioteca Virginie Buff D'Ápice


  7 / 37 LILACS  
              first record previous record next record last record
select
to print
Photocopy
SciELO Brazil full text
Full text
Id: lil-687263
Author: Leite, Ricardo Andre Amorim; Otaduy, Maria Concepcion Garcia; Silva, Gilson Edmar Goncalves e; Ferreira, Maria Lucia Brito; Aragao, Maria de Fatima Vasco.
Title: Proton magnetic spectroscopy agreed better with magnetic resonance image to lateralization of epileptogenic zone than with surface electroencephalography / Espectroscopia de protons de hidrogenio na investigacao ambulatorial das epilepsias extra-temporais
Source: Arq. neuropsiquiatr;71(9A):584-590, set. 2013. tab, graf.
Language: en.
Abstract: Objective To analyze the agreement rate of proton magnetic spectroscopy with magnetic resonance image (MRI) and surface electroence-phalography (EEG) in extratemporal neocortical epilepsies. Methods A cross-sectional study, type series of cases included 33 patients, age range 13–59 years old, of both gender, presenting structural alteration identified by MRI (75.8%) or by neurophysiologic techniques (72.7%). The variables were alterations of N-acetyl-aspartate/choline, N-acetyl-aspartate/creatine, choline/creatine, and N-acetyl-aspartate/cho-line+creatine coefficient of asymmetry. Results Agreement rates of lateralization by coefficient of asymmetry of NAA/Cho, NAA/Cr, Co/Cr, and NAA/Cho+Cr with MRI, independent of alteration of surface EEG, were equal to 93.3, 57.9, 15.4, and 93.3%, respectively, modifying to 100, 33.3, 0, and 100%, in 16 patients, with lateralization agreement of MRI and surface EEG. Conclusion Proton magnetic spectroscopy agreed better with MRI to lateralization of epileptogenic zone than with surface EEG. .

Objetivo Analisar a taxa de concordância da espectroscopia de prótons de hidrogênio com imagem de ressonância magnética (IRM) e o eletrencefalograma (EEG) de superfície nas epilepsias neocorticais extratemporais. Métodos Estudo transversal, série de casos, incluiu 33 pacientes, com idade de 13 a 59 anos, de ambos os gêneros, apresentando alteração estrutural à IRM (75,8%) ou neurofisiológica à (72,7%). As variáveis estudadas foram as alterações dos coeficientes de assimetria de N-acetil-aspartato/colina, N-acetil-aspartato/crea-tina, Colina/Creatina e N-acetil-aspartato/colina+creatina. Resultados As taxas de concordância de lateralização dos coeficientes de assimetria de NAA/Co, NAA/Cr, Co/Cr e NAA/Co+Cr com a IRM, independentemente de alterações do EGG de superfície, passaram de 93,3, 57,9, 15,4, 93,3%, respectivamente, para 100, 33,3, zero, 100%, em 16 pacientes, mostrando concordância de lateralização entre IRM e EEG de superfície. Conclusão A espectroscopia de prótons de hidrogênio concordou melhor com a lateralização da zona epileptogênica pela IRM do que com o EEG de superfície. .
Responsable: BR1.1 - BIREME


  8 / 37 LILACS  
              first record previous record next record last record
select
to print
Photocopy
SciELO Brazil full text
Valenca, Marcelo Moraes
Full text
Id: lil-670889
Author: Arquivos de Neuro-Psiquiatria; Menezes, Terce Liana; Andrade-Valença, Luciana Patrízia A.; Valença, Marcelo Moraes.
Title: Magnetic resonance imaging study cannot individually distinguish individuals with mild cognitive impairment, mild Alzheimer's disease, and normal aging / Estudo por ressonância magnética não pode diferenciar individualmente os indivíduos com declínio cognitivo leve, doença de Alzheimer leve e envelhecimento normal
Source: Arq. neuropsiquiatr;71(4):207-212, abr. 2013. tab, graf.
Language: en.
Abstract: Objective: To evaluate the volumetric and spectroscopy aspects of hippocampus in patients with mild Alzheimer's disease (AD) and mild cognitive impairment (MCI). Methods: A series of patients older than 65 years and with memory deficit were studied. Results: The evocation of words test presented a significant reduction in the number of words recalled by the patients with MCI and mild AD as compared with the control group. Bilateral reduction of the hippocampus volume in the AD group was observed when compared to the control group. There were no statistical differences in the values of NAA/Cr, mI/Cr, Cho/Cr and mI/NAA between the groups. Conclusions: Magnetic resonance imaging study failed to individually distinguish patients with MCI, mild AD and normal aging. However, patients with mild AD presented loss of asymmetry between the right and left hippocampus, and a reduction in hippocampus volume. .

Objetivo: Avaliar volume e espectroscopia do hipocampo em pacientes com doença de Alzheimer leve e declínio cognitivo leve. Métodos: Foi estudada uma série de pacientes com 65 anos de idade ou mais, com déficit de memória. Resultados: O teste de evocação de palavras mostrou redução significativa no número de palavras lembradas pelos pacientes com declínio cognitivo leve e doença de Alzheimer leve, em comparação com o grupo controle. Foi observada redução bilateral do volume do hipocampo no grupo com doença de Alzheimer quando comparado com o grupo controle. Não houve diferença estatística nos valores de NAA/Cr, mI/Cr, Cho/Cr e mI/NAA entre os grupos. Conclusão: Estudo pela ressonância magnética não diferencia individualmente os pacientes com declínio cognitivo leve, doença de Alzheimer leve e envelhecimento normal. No entanto, pacientes com quadro leve de doença de Alzheimer apresentam perda de assimetria entre os hipocampos direito e esquerdo e redução no volume do hipocampo. .
Responsable: BR1.1 - BIREME


  9 / 37 LILACS  
              first record previous record next record last record
select
to print
Photocopy
Id: lil-661363
Author: Ambros, Senair Alberto; Abreu, Paulo Belmonte; Ferreira, Eloísa Elena; Ferreira, Pdro Eugenio M; Ambros, Luciana Estacia.
Title: Association between altered proton magnetic resonance spectroscopy (1H MRS) findings and clinical symptoms of schizophrenia
Source: Rev. neuropsiquiatr;74(1):183-190, ene.-mar. 2011.
Language: en.
Abstract: Objective: To assess the metabolic alterations of the thalamus in subjects with schizophrenia compared to healthy subjects and to investigate whether specific schizophrenic symptoms are associated with metabolic alterations measured by 1H MRS. Methods: This is a case-control study including patients with schizophrenia diagnosed usingthe Diagnostic and Statistical Manual of Mental Disorders - Fourth Edition, DMS-IV and the Operational CriteriaChecklist for Psychotic Illness (OPCRIT). Proton magnetic resonance spectroscopy (1H MRS) was used to assess metabolite concentrations (N-acetylaspartate, choline, creatinine, myoionositol and lactacte) in the left and rightthalamus of 13 patients with schizophrenia and 13 healthy controls. Results: In this study, concentrations of specific metabolites in the thalamus, determined by 1H MRS, were similar for individuals with schizophrenia andcontrols. It was observed that cases with family history of schizophrenia and disorganized speech demonstrated areduction in the ratio of the metabolites NAA /Cho in the thalamic nuclei on the right side. However, those withorganized delusions, hallucinations and non-affective auditory hallucinations had an increase of metabolites on theright side compared to the left thalamus. Decreased thalamic metabolic activity in patients with positive symptomswas observed in contrast with those who had well-organized delusions and auditory non-affective hallucinations,core symptoms of schizophrenia. Conclusion: A lateralized thalamic involvement was verified, suggesting thatorganic and genetic factors compromise the right thalamus and that the disorganization associated with delusionsand hallucinations compromises the left thalamic nuclei. Further studies to investigate the correlation betweensymptoms and thalamic dysfunction are warranted. (Rev Neuropsiquiatr 2011;74:183-190).

Objetivo: Evaluar las alteraciones metabólicas del tálamo en personas con esquizofrenia comparándolas con controles sanos e investigar si los síntomas específicos de la esquizofrenia están vinculados a alteraciones metabólicas medidas por 1H MRS. Métodos: Se realizó la espectroscopía por resonancia magnética (1H-MRS) para estimar concentraciones de metabolitos (N-acetil- aspartato, colina creatinina, mioionositol y lactato) en el tálamo izquierdo y derecho de 13 pacientes con esquizofrenia y 13 controles. Resultados: Las concentraciones de metabolitos específicos en el tálamo fueron iguales para las personas con esquizofrenia y los controles. Se observó que los pacientes con historia familiar de esquizofrenia y aquellos que presentaban lenguaje desorganizado tenían una reducción de los metabolitos NAA/Co en los núcleos talámicos de la derecha. Sin embargo, en aquellos delirios ordenados, alucionaciones no afectivas y alucinaciones auditivas los metabolitos del lado derecho tuvieron cierto aumento con relación a los núcleos talámicos de la izquierda. Se encontró una reducción en la actividad metabólica talámica en los pacientes con síntomas positivos, al contrario de aquellos que presentaron delirios bien ordenados y alucinaciones auditivas no afectivas, los síntomas más nucleares de la esquizofrenia. Conclusión: Se verificó cierta lateralización del envolvimiento talámico, sugiriendo que los factores orgánicos y los genéricos comprometen el tálamo derecho y que la desorganización asociada a los delirios y alucionaciones compromete los núcleos talámicos de la izquierda. Más estudios son necesarios para investigar la validez de la correlación entre síntomas y disfunción talámica.
Responsable: PE1.1 - Oficina Universitária de Biblioteca


  10 / 37 LILACS  
              first record previous record
select
to print
Photocopy
SciELO Venezuela full text
Full text
Full text
Id: lil-630382
Author: Garay, José L; López H., William J; Mosquera F., Elis A; Subiela H., José D; Loureiro D S, Nelson E.
Title: La regulación del transportador de colina de alta afinidad dependiente de AMPc/PKA no es mediada por dopamina en neuronas de retina / cAMP/PKA - dependent regulation of the high affinity choline transporter is not mediated by dopamine in retinal neurons
Source: Arch. venez. farmacol. ter;29(4):66-71, dic. 2010. ilus.
Language: es.
Abstract: La actividad del transportador de colina de alta afinidad (HAChT) es considerado el paso limitante en la síntesis de acetilcolina (ACh) en el terminal colinérgico. Estudios recientes muestran que el HAChT contiene residuos de serina y treonina consensuales para la fosforilación por proteína kinasa A (PKA). Usando neuronas de retina de embrión de pollo se evaluó el efecto del segundo mensajero AMPc sobre la actividad del HAChT. El aumento de los niveles intracelulares de AMPc a través de la inhibición de la fosfodiesterasa, activación de la adenilato ciclasa o usando un análogo de AMPc resistente a la fosfodiesterasa disminuyó la actividad del HAChT entre 29 y 69%. Por otra parte, la activación de receptores de dopamina tipo-D1 aumenta los niveles de AMPc intracelular y activa PKA, sin embargo, el tratamiento con dopamina o con antagonistas de los receptores dopaminergicos D1 o D2 no induce cambios en la actividad del transportador

The high affinity choline transporter (HAChT) activity is considered to be the rate-limiting step in acetylcholine (ACh) synthesis in the cholinergic terminal. Recent studies show that HAChT contains consensus serine and threonine residues for protein kinase A (PKA) phosphorylation. Using chick retinal neurons evaluated the effects of the second messenger cAMP on the HAChT activity. The increase of the intracellular cAMP levels through phosphodiesterase inhibition, adenilatecyclase activation or using a phosphodiesterase-resistant cAMP analog decreased HAChT activity between 29 and 69%. Moreover, the activation of dopamine D1-type receptors increase the intracellular cAMP levels and activates PKA, however, the treatment with dopamine D1 or D2 receptor antagonists does not induce changes on transporter activity
Responsable: VE1.1 - Biblioteca Humberto Garcia Arocha



page 1 of 4 go to page            
   


Refine the search
  Database : Advanced form   

    Search in field  
1  
2
3
 
           



Search engine: iAH v2.6 powered by WWWISIS

BIREME/PAHO/WHO - Latin American and Caribbean Center on Health Sciences Information