Learning Deficits Induced by High-Calorie Feeding in the Rat are Associated With Impaired Brain Kynurenine Pathway Metabolism.

In addition to be a primary risk factor for type 2 diabetes and cardiovascular disease, obesity is associated with learning disabilities. Here we examined whether a dysregulation of the kynurenine pathway (KP) of tryptophan (Trp) metabolism might underlie the learning deficits exhibited by obese individuals. The KP is initiated by the enzymatic conversion of Trp into kynurenine (KYN) by indoleamine 2,3-dioxygenase (IDO). KYN is further converted to several signaling molecules including quinolinic acid (QA) which has a negative impact on learning. Wistar rats were fed either standard chow or made obese by exposure to a free choice high-fat high-sugar (fcHFHS) diet. Their learning capacities were evaluated using a combination of the novel object recognition and the novel object location tasks, and the concentrations of Trp and KYN-derived metabolites in several brain regions determined by ultra-performance liquid chromatography-tandem mass spectrometry. Male, but not female, obese rats exhibited reduced learning capacity characterized by impaired encoding along with increased hippocampal concentrations of QA, Xanthurenic acid (XA), Nicotinamide (Nam), and oxidized Nicotinamide Adenine Dinucleotide (NAD+). In contrast, no differences were detected in the serum levels of Trp or KP metabolites. Moreover, obesity enhanced the expression in the hippocampus and frontal cortex of kynurenine monooxygenase (KMO), an enzyme involved in the production of QA from kynurenine. QA stimulates the glutamatergic system and its increased production leads to cognitive impairment. These results suggest that the deleterious effects of obesity on cognition are sex dependent and that altered KP metabolism might contribute to obesity-associated learning disabilities.

Delirium and quality of life in critically ill patients: a prospective cohort study. / Delirium e qualidade de vida em pacientes críticos: um estudo de coorte prospectivo.

OBJECTIVE: To evaluate the association between the incidence of delirium in the intensive care unit and quality of life 1 month after hospital discharge. METHODS: This was a prospective cohort study conducted in the intensive care units of two medium-complexity hospitals from December 2015 to December 2016. Delirium was identified using the Confusion Assessment Method for the Intensive Care Unit scale. At the time of hospital discharge, functional capacity and cognition were assessed with the Barthel index and the Mini Mental State Examination, respectively. Thirty days after patient discharge, the World Health Organization Quality of Life-BREF questionnaire was administered by telephone. RESULTS: A total of 216 patients were included. Delirium was identified in 127 (58.8%) of them. Patients with delirium exhibited greater functional dependence (median Barthel index 50.0 [21.2 - 70.0] versus 80.0 [60.0 - 95.0]; p < 0.001) and lower cognition (Mini Mental State Examination score 12.9 ± 7.5 versus 20.7 ± 9.8; p < 0.001) at hospital discharge. There was no difference in any of the quality-of-life domains evaluated 1 month after hospital discharge between patients with and without delirium. CONCLUSION: Our findings suggest that patients with delirium in the intensive care unit do not have worse quality of life 1 month after hospital discharge, despite presenting greater cognitive impairment and functional disability at the time of hospital discharge.

OBJETIVO: Avaliar a associação entre a incidência de delirium na unidade de terapia intensiva e qualidade de vida 1 mês após a alta hospitalar. MÉTODOS: Trata-se de estudo de coorte prospectivo desenvolvido em unidades de terapia intensiva de dois hospitais de média complexidade durante o período de dezembro de 2015 a dezembro de 2016. Delirium foi identificado por meio da escala Confusion Assessment Method for the Intensive Care Unit. No momento da alta hospitalar, foram avaliadas capacidade funcional e cognição por meio do índice de Barthel e da escala de Mini Exame do Estado Mental, respectivamente. Após 30 dias da alta hospitalar do paciente, por meio de contato telefônico, aplicou-se o questionário World Health Organization Quality of Life-Bref. RESULTADOS: Foram incluídos 216 pacientes. Delirium foi identificado em 127 (58,8%) deles. Os pacientes com delirium apresentaram maior dependência funcional (mediana do índice de Barthel 50,0 [21,2 - 70,0] versus 80,0 [60,0 - 95,0]; p < 0,001) e menor cognição (escore do Mini Exame do Estado Mental 12,9 ± 7,5 versus 20,7 ± 9,8; p < 0,001) na alta hospitalar. Com relação à qualidade de vida, avaliada 1 mês após alta hospitalar, não houve diferença, em nenhum dos domínios, entre os pacientes com e sem delirium. CONCLUSÃO: Nossos achados sugerem que os pacientes com delirium na unidade de terapia intensiva não apresentam piora da qualidade de vida 1 mês após a alta hospitalar, apesar de apresentarem maior prejuízo cognitivo e incapacidade funcional no momento da alta hospitalar.

Delirium e qualidade de vida em pacientes críticos: um estudo de coorte prospectivo / Delirium and quality of life in critically ill patients: a prospective cohort study

RESUMO Objetivo: Avaliar a associação entre a incidência de delirium na unidade de terapia intensiva e qualidade de vida 1 mês após a alta hospitalar Métodos: Trata-se de estudo de coorte prospectivo desenvolvido em unidades de terapia intensiva de dois hospitais de média complexidade durante o período de dezembro de 2015 a dezembro de 2016. Delirium foi identificado por meio da escala Confusion Assessment Method for the Intensive Care Unit. No momento da alta hospitalar, foram avaliadas capacidade funcional e cognição por meio do índice de Barthel e da escala de Mini Exame do Estado Mental, respectivamente. Após 30 dias da alta hospitalar do paciente, por meio de contato telefônico, aplicou-se o questionário World Health Organization Quality of Life-Bref. Resultados: Foram incluídos 216 pacientes. Delirium foi identificado em 127 (58,8%) deles. Os pacientes com delirium apresentaram maior dependência funcional (mediana do índice de Barthel 50,0 [21,2 - 70,0] versus 80,0 [60,0 - 95,0]; p < 0,001) e menor cognição (escore do Mini Exame do Estado Mental 12,9 ± 7,5 versus 20,7 ± 9,8; p < 0,001) na alta hospitalar. Com relação à qualidade de vida, avaliada 1 mês após alta hospitalar, não houve diferença, em nenhum dos domínios, entre os pacientes com e sem delirium. Conclusão: Nossos achados sugerem que os pacientes com delirium na unidade de terapia intensiva não apresentam piora da qualidade de vida 1 mês após a alta hospitalar, apesar de apresentarem maior prejuízo cognitivo e incapacidade funcional no momento da alta hospitalar.

Abstract Objective: To evaluate the association between the incidence of delirium in the intensive care unit and quality of life 1 month after hospital discharge. Methods: This was a prospective cohort study conducted in the intensive care units of two medium-complexity hospitals from December 2015 to December 2016. Delirium was identified using the Confusion Assessment Method for the Intensive Care Unit scale. At the time of hospital discharge, functional capacity and cognition were assessed with the Barthel index and the Mini Mental State Examination, respectively. Thirty days after patient discharge, the World Health Organization Quality of Life-BREF questionnaire was administered by telephone. Results: A total of 216 patients were included. Delirium was identified in 127 (58.8%) of them. Patients with delirium exhibited greater functional dependence (median Barthel index 50.0 [21.2 - 70.0] versus 80.0 [60.0 - 95.0]; p < 0.001) and lower cognition (Mini Mental State Examination score 12.9 ± 7.5 versus 20.7 ± 9.8; p < 0.001) at hospital discharge. There was no difference in any of the quality-of-life domains evaluated 1 month after hospital discharge between patients with and without delirium. Conclusion: Our findings suggest that patients with delirium in the intensive care unit do not have worse quality of life 1 month after hospital discharge, despite presenting greater cognitive impairment and functional disability at the time of hospital discharge.

Association of fecal occult blood tests results with colonoscopic findings in a general hospital and validation of the screening test / Achados colonoscópicos em pacientes submetidos a exame de sangue oculto nas fezes e validacão deste teste de triagem

ABSTRACT Globally, colorectal cancer is the third leading cause of cancer death among men and the second among women, corresponding to about 10% of all cancers. The Brazilian Ministry of Health and National Cancer Institute recommend the screening of colorectal cancer for people over 50 years-old with Fecal Occult Blood Test. Endoscopy is limited to patients with positive screening results. The aim of this study is to evaluate the incidence of malignant or premalignant lesions diagnosed by endoscopy in patients with positive or negative Fecal Occult Blood Test and assess the efficacy of Fecal Occult Blood Test to predict the finding of a malignant colorectal lesion. We carried out a cross-sectional study among patients with a Fecal Occult Blood Test result that were submitted to colonoscopy, in the same hospital, from March 2016 to July 2017. Sensitivity, specificity, positive and negative predictive value of Fecal Occult Blood Test compared to colonoscopy neoplastic findings was calculated. The total of 92 patients were enrolled, 52 (56.5%) were female, Fecal Occult Blood Test was positive in 42.4% of them and in 41 (44.6%) the colonoscopy showed abnormal findings. Polyps were the most frequent alteration, found in 20 patients (21.7%). Among the patients with polyps, 15 (16.3%) had neoplastic and 5 (5.4%) presented non-neoplastic polyps. The Fecal Occult Blood Test sensitivity for detection of neoplastic polyps was 66.7%, specificity 62.3%, positive predictive value 11% and negative predictive value was 94.2%. Considering the need for a screening method, Fecal Occult Blood Test showed to be an effective and reliable screening test that can be applied in public health programs to detect and prevent colorectal cancer.

RESUMO Globalmente, o carcinoma colorretal é a terceira principal causa de morte por neoplasia entre homens e a segunda entre mulheres, correspondendo a 10% de todas as neoplasias. O Ministério da Saúde Brasileiro e o Instituto Nacional do Câncer recomendam a triagem do câncer colorretal para indivíduos acima de 50 anos, utilizando a Pesquisa de Sangue Oculto nas fezes. A endoscopia é reservada para aqueles com Pesquisa de Sangue Oculto nas fezes positiva. O objetivo deste estudo é avaliar a incidência de lesões malignas/pré-malignas diagnósticas na colonoscopia e correlacionar com os resultados prévios da Pesquisa de Sangue Oculto e verificar a eficácia da Pesquisa de Sangue Oculto para predizer uma lesão colorretal maligna. Realizamos um estudo transversal em pacientes que apresentavam resultados positivos ou negativos de Pesquisa de Sangue Oculto nas fezes e foram submetidos à colonoscopia, na mesma instituição, entre março de 2016 e julho de 2017. Dos 92 participantes; 52 (56,5%) eram do sexo feminino, a Pesquisa de Sangue Oculto nas fezes foi positiva em 42,4%; e em 41 (44,6%) a colonoscopia mostrou alterações. Em 20 pacientes (21,7%) havia pólipos; 15 (16,3%) eram neoplásicos e 5 (5,4%) não neoplásicos. A sensibilidade da Pesquisa de Sangue Oculto nas fezes para detecção de pólipos neoplásicos foi 66,7%; a especificidade 62,3%; o valor preditivo positivo 11% e o valor preditivo negativo 94,2%. Considerando a necessidade de um método de triagem, a Pesquisa de Sangue Oculto nas fezes mostrou ser um exame de triagem eficaz e confiável para ser aplicado em programas de saúde pública com o objetivo de detectar e prevenir o carcinoma colorretal.

Acute cytomegalovirus infection associated with pulmonary embolism treated successfully with rivaroxaban: case report.

Severe life-threatening thromboembolism may be caused exclusively by the presence of an acute CMV infection or due to the association of this agent and other thrombogenic factors. We report a case of an immunocompetent young female patient who presented a pulmonary embolism associated with acute CMV infection. The patient did not have any other apparent cause of thrombosis. She was successfully treated with rivaroxaban for 6 months without further episodes. To the best of our knowledge, this is the first report of a pulmonary embolism associated with CMV treated with a direct oral anticoagulant. The current case report calls attention to the importance of signs and symptoms of thromboembolism among patients with CMV. Direct oral anticoagulants can potentially bring the same benefits to treat pulmonary embolism associated with CMV as those observed in patients not infected.

Crohn's disease versus Yersinia enterocolitica infection - case report - a difficult differential diagnosis / Doença de Crohn's × Yersinia enterocolitica - um difícil diagnóstico diferencial - relato de caso

ABSTRACT The aim of this report is to present an unusual case of Crohn's disease affecting the terminal ileum; whose principal differential diagnosis was Yersinia enterolocolitica infection, as the histological features of the resected ileum was common to both diseases. We also describe how the infectious etiology was discarded and the implications for the patient follow-up.

RESUMO O objetivo desse relato é analisar um caso incomum de doença de Crohn, cujo diagnóstico diferencial, com possível infecção por Yersinia enterocilítica, foi dificultado pela presença de alterações histológicas das duas doenças. Descrevemos como foi realizada a exclusão de causas infecciosas e as implicações no acompanhamento do paciente.

Pressure-support ventilation or T-piece spontaneous breathing trials for patients with chronic obstructive pulmonary disease - A randomized controlled trial.

BACKGROUND: Little is known about the best strategy for weaning patients with chronic obstructive pulmonary disease (COPD) from mechanical ventilation. Spontaneous breathing trials (SBT) using a T-piece or pressure-support ventilation (PSV) have a central role in this process. Our aim was to compare T-piece and PSV SBTs according to the duration of mechanical ventilation (MV) in patients with COPD. METHODS: Patients with COPD who had at least 48 hours of invasive MV support were randomized to 30 minutes of T-piece or PSV at 10 cm H2O after being considered able to undergo a SBT. All patients were preemptively connected to non-invasive ventilation after extubation. Tracheostomized patients were excluded. The primary outcome was total invasive MV duration. Time to liberation from MV was assessed as secondary outcome. RESULTS: Between 2012 and 2016, 190 patients were randomized to T-piece (99) or PSV (91) groups. Extubation at first SBT was achieved in 78% of patients. The mean total MV duration was 10.82 ± 9.1 days for the T-piece group and 7.31 ± 4.9 days for the PSV group (p < 0.001); however, the pre-SBT duration also differed (7.35 ± 3.9 and 5.84 ± 3.3, respectively; p = 0.002). The time to liberation was 8.36 ± 11.04 days for the T-piece group and 4.06 ± 4.94 for the PSV group (univariate mean ratio = 2.06 [1.29-3.27], p = 0.003) for the subgroup of patients with difficult or prolonged weaning. The study group was independently associated with the time to liberation in this subgroup. CONCLUSIONS: The SBT technique did not influence MV duration for patients with COPD. For the difficult/prolonged weaning subgroup, the T-piece may be associated with a longer time to liberation, although this should be clarified by further studies. TRIAL REGISTRATION: ClinicalTrials.gov NCT01464567, at November 3, 2011.

As (Las) parasitoses intestinais por prevalência de geohelmintos representam sérios problemas de saúde pública / Intestinal parasitoses whith prevalence of geohelminths are a public health problem

In Brazil, helminth infections are a public health problem that have a close relationship with poverty, low hygienic conditions of the population and deficiency of basic sanitation. Soil contamination by human and animal fecal matter is an important factor in the transmission of intestinal parasitoses, especially in most of the Brazilian coast, since the presence of sewage discharge channels and wandering animals, potentially transmitting parasitoses in areas frequented by bathers, is quite frequent. This study had the objective to evaluate the parasitological conditions in the sand strip of the estuary of Barra Nova, Espírito Santo, Brazil. Material and methods: The samples were collected over a year and were analyzed at the Laboratory of Parasitology, University Center of Northern Espírito Santo, at the Federal University of Espírito Santo. The techniques of spontaneous sedimentation and flotation were applied in a total of 120 sand samples. Results: The study indicated that 20% of the samples were positive for hookworm larvae and parasitic forms were found at all collection stations. Conclusions: Considering the importance of parasites in the context of public health, since parasitic diseases are more frequent in less developed regions and are intrinsically related to issues such as soil and water use conditions, the results indicate the need for the permanent application of preventive and educational measures, control and treatment of the affected population

No Brasil, as helmintoses constituem um (En Brasil, las helmintiasis constituyen un) problema de saúde pública que mantém estreita relação com pobreza, baixa condição higiênica da (mantiene una estrecha relación con la pobreza, las malas condiciones higiénicas de la) população e deficiência de saneamento básico. A contaminação do solo (contaminación del suelo) por matéria fecal humana e animal é um importante fator (y animal es un importante factor) de transmissão de parasitoses intestinais, especialmente em grande parte do (en gran parte del) litoral brasileiro, uma vez que é (ya que es) bastante frequente a presença de canais de descargas de esgoto e (presencia de canales de descarga de aguas residuales y) animais errantes, potencialmente transmissores de parasitoses em áreas frequentadas pelos banhistas (por los bañistas). Como objetivo, o presente estudo avaliou as condições parasitológicas na faixa de areia do (evaluó las condiciones parasitológicas en la franja de arena del) estuário de Barra Nova, Espírito Santo, Brasil. Material e métodos: As coletas foram realizadas ao longo de um ano e as amostras (La recolección se hizo a lo largo de un año y las muestras) analisadas no Laboratório de Parasitologia, do Centro Universitário Norte do Espírito Santo, da Universidade Federal do Espírito Santo. Foram aplicadas as técnicas de sedimentação espontânea e de flutuação em um (y de fluctuación en un) total de 120 amostras de areia. Resultados: O estudo indicou (El estudio señaló) que 20% de amostras estavam positivas para larvas de ancilostomídeo e em todas as estações (y en todos los puntos) de coleta foram encontradas formas parasitárias. Conclusões: Considerando a importância das parasitoses no contexto da (de las parasitosis en el ámbito de la) saúde pública, uma vez que as doenças parasitárias são mais (ya que las enfermedades parasitarias son más) freqüentes em regiões menos desenvolvidas e estão (desarrolladas y están) intrinsicamente relacionadas a questões como condições de uso do solo e da água os (cuestiones tales como las condiciones de uso del suelo y del agua los) resultados indicam a necessidade de aplicação permanente de medidas educativas, preventivas, controle e tratamento da população afetada (de la población afectada)

Bone disease in primary hyperparathyroidism.

Bone disease in severe primary hyperparathyroidism (PHPT) is described classically as osteitis fibrosa cystica (OFC). Bone pain, skeletal deformities and pathological fractures are features of OFC. Bone mineral density is usually extremely low in OFC, but it is reversible after surgical cure. The signs and symptoms of severe bone disease include bone pain, pathologic fractures, proximal muscle weakness with hyperreflexia. Bone involvement is typically characterized as salt-and-pepper appearance in the skull, bone erosions and bone resorption of the phalanges, brown tumors and cysts. In the radiography, diffuse demineralization is observed, along with pathological fractures, particularly in the long bones of the extremities. In severe, symptomatic PHPT, marked elevation of the serum calcium and PTH concentrations are seen and renal involvement is manifested by nephrolithiasis and nephrocalcinosis. A new technology, recently approved for clinical use in the United States and Europe, is likely to become more widely available because it is an adaptation of the lumbar spine DXA image. Trabecular bone score (TBS) is a gray-level textural analysis that provides an indirect index of trabecular microarchitecture. Newer technologies, such as high-resolution peripheral quantitative computed tomography (HR-pQCT), have provided further understanding of the microstructural skeletal features in PHPT.

Bone disease in primary hyperparathyroidism / Doença óssea no hiperparatiroidismo primário

Bone disease in severe primary hyperparathyroidism (PHPT) is described classically as osteitis fibrosa cystica (OFC). Bone pain, skeletal deformities and pathological fractures are features of OFC. Bone mineral density is usually extremely low in OFC, but it is reversible after surgical cure. The signs and symptoms of severe bone disease include bone pain, pathologic fractures, proximal muscle weakness with hyperreflexia. Bone involvement is typically characterized as salt-and-pepper appearance in the skull, bone erosions and bone resorption of the phalanges, brown tumors and cysts. In the radiography, diffuse demineralization is observed, along with pathological fractures, particularly in the long bones of the extremities. In severe, symptomatic PHPT, marked elevation of the serum calcium and PTH concentrations are seen and renal involvement is manifested by nephrolithiasis and nephrocalcinosis. A new technology, recently approved for clinical use in the United States and Europe, is likely to become more widely available because it is an adaptation of the lumbar spine DXA image. Trabecular bone score (TBS) is a gray-level textural analysis that provides an indirect index of trabecular microarchitecture. Newer technologies, such as high-resolution peripheral quantitative computed tomography (HR-pQCT), have provided further understanding of the microstructural skeletal features in PHPT.

A doença óssea no hiperparatiroidismo primário grave é representada pela osteíte fibrosa cística (OFC). Dor óssea, deformidades esqueléticas e fraturas patológicas são achados comuns na OFC. A densidade mineral óssea está, usualmente, extremamente diminuída na OFC, mas é reversível após a cura cirúrgica. Os sinais e sintomas da doença óssea grave incluem dor óssea, fraturas patológicas e fraqueza muscular proximal com hiper-reflexia. O comprometimento ósseo é tipicamente caracterizado pela aparência em “sal-e-pimenta” nos ossos do crânio, erosões ósseas e reabsorção das falanges, tumores marrons e cistos. Na radiografia, observam-se desmineralização difusa e fraturas patológicas especialmente nos ossos longos das extremidades. No hiperparatiroidismo primário (HPTP) sintomático grave, as concentrações séricas de cálcio e PTH estão usualmente bem elevadas e o comprometimento renal se caracteriza pela presença de urolitíase e nefrocalcinose. Uma nova tecnologia, recentemente aprovada para uso clínico nos Estados Unidos e na Europa, torna-se provável se difundir rapidamente, pois utiliza as imagens geradas pela densitometria DXA. O escore trabecular ósseo (TBS), obtido por meio da análise do nível da textura cinza das imagens dos corpos vertebrais, fornece informações indiretas sobre a microarquitetura trabecular. Novos métodos, como a tomografia de alta resolução quantitativa periférica computadorizada (HRpqCT), têm proporcionado conhecimentos adicionais sobre os achados da microarquitetura esquelética no HPTP.

Schistosomias in the northern state of Espírito Santo, Brazil

Estima-se que o Schistosoma mansoni esteja presente em 19 estados brasileiros e um dos fatores responsáveis pela expansão da esquistossomose é a migração de indivíduos de áreas endêmicas, principalmente do Nordeste do país. O presente estudo teve por objetivo avaliar a ocorrência da esquistossomose entre trabalhadores, migrantes da Região Nordeste do país, que atuavam em Conceição da Barra, norte do Espírito Santo, no corte da cana-de-açúcar para uma indústria de produção de álcool. Para a determinação dos parasitos intestinais, foram utilizadas as técnicas de sedimentação espontânea e Kato-Katz. Dos 287 indivíduos analisados, 45 (15,7 por cento), provenientes dos estados de Alagoas, Pernambuco e Bahia, estavam positivos para S. mansoni. Do total de positivos, 38 (84,4 por cento) eram provenientes do estado de Alagoas, 6 (13,3 por cento) do estado de Pernambuco e apenas 1 (2,2 por cento) do estado da Bahia. Os resultados indicam a possibilidade de expansão da esquistossomose na região norte do Espírito Santo.

It is estimated that Schistosoma mansoni is present in 19 Brazilian states and one of the factorsresponsible for the spread of schistosomiasis is the migration of individuals from endemic areas,particularly from northeastern Brazil. In the municipality of Conceição da Barra, northern stateof Espírito Santo, the present study aimed to evaluate the occurrence of schistosomiasis amongsugarcane cutting workers in the alcohol industry, who migrated from the northeastern region ofthe country. For the diagnosis of intestinal parasites, spontaneous sedimentation and Kato-Katztechniques were used. Of the 287 individuals analyzed, 45 (15.7 por cento), from the states of Alagoas,Pernambuco and Bahia, were positive for S. mansoni. Of the total positive individuals, 38 (84.4 por cento)were from the state of Alagoas, 6 (13.3 por cento) from Pernambuco and 1 (2.2 por cento) from Bahia. The resultsindicate the possibility of schistosomiasis expansion in the northern state of Espírito Santo.

A construção do diagnóstico do autismo em uma rede social virtual brasileira / The construction of the diagnosis of autism in a Brazilian virtual community / La construcción del diagnóstico de autismo en una red social virtual brasileña

Este artigo apresenta alguns resultados de uma pesquisa realizada em uma rede social virtual brasileira, com o tema do autismo. Investigou-se a opinião pública sobre o autismo nessa rede, por meio de suas comunidades ligadas ao assunto. A opinião pública sobre determinada condição médica traz consequências diretas sobre a experiência do doente e sobre as pessoas implicadas em cuidar dos pacientes acometidos. Os resultados apontam algumas direções a respeito das representações dos usuários sobre as supostas causas da doença, os métodos de tratamento, as formas de ativismo e de busca de direitos dos portadores, e os usos paradoxais do conhecimento médico, ao qual se atribui a possibilidade de desvendar a doença, e, ao mesmo tempo, é alvo de resistência de pais e cuidadores, que priorizam o conhecimento proveniente de sua experiência cotidiana com os autistas.

This article presents preliminary results from ongoing research about autism in Brazilian virtual communities. We investigated public opinion about autism in the virtual communities dedicated to this issue. Public opinion about a medical condition directly influences the sick person's experience and the experiences of her caregivers and family. The results describe the social representations of the users - mainly parents and caregivers of autistic children - about the supposed causes of autism, the forms of treatment, the forms of activism and the rights of autistics and the ambivalent use of medical knowledge, which is frequently endowed with the capacity of disclosing the disease, but which is also resisted in favor of lay knowledge of parents and caregivers based on their daily experience with the autistic people.

Este artículo presenta resultados de una investigación realizada en una red social virtual brasileña sobre autismo. Fue investigada la opinión pública sobre el autismo por medio de las comunidades dedicadas al asunto. La opinión pública sobre determinada condición médica tiene consecuencias inmediatas sobre el enfermo y las personas implicadas directamente en cuidar de los pacientes que sufren la enfermedad. Los resultados dan informaciones sobre las representaciones de los usuarios, sobre las supuestas causas de la enfermedad, los métodos de tratamiento, las formas de activismo y de búsqueda de derechos de los portadores, y los usos paradójicos del conocimiento médico, al cual se atribuye en algunas ocasiones la posibilidad de desvelar la enfermedad, y en otras es objeto de resistencia de padres y cuidadores con base en su experiencia cotidiana con los autistas.

Effects of short-term and long-term treatment with medium- and long-chain triglycerides ketogenic diet on cortical spreading depression in young rats.

The ketogenic diet (KD) is a high fat and low carbohydrate and protein diet. It is used in the clinical treatment of epilepsy, in order to decrease cerebral excitability. KD is usually composed by long-chain triglycerides (LCT) while medium-chain triglycerides (MCT) diet is beginning to be used in some clinical treatment of disorders of pyruvate carboxylase enzyme and long-chain fatty acid oxidation. Our study aimed to analyze the effects of medium- and long-chain KD on cerebral electrical activity, analyzing the propagation of the phenomenon of cortical spreading depression (CSD). Three groups of weaned rats (21 days old) received, for 7 weeks, either a control (AIN-93G diet), or a MCT-KD (rich in triheptanoin oil), or a LCT-KD (rich in soybean oil). They were compared to another three groups (21 days old) receiving the same diets for just 10 days. CSD propagation was evaluated just after ending the dietary treatments. Results showed that short-term KD treatment resulted in a significant reduction of the CSD velocity of propagation (control group: 4.02+/-1.04mm/min; MCT-KD: 0.81+/-1.46mm/min and LCT-KD: 2.26+/-0.41mm/min) compared to the control group. However, long-term treatment with both KDs had no effect on the CSD velocity (control group: 3.10+/-0.41mm/min, MCT-KD: 2.91+/-1.62mm/min, LCT-KD: 3.02+/-2.26mm/min) suggesting that both short-term KDs have a positive effect in decreasing brain cerebral excitability in young animals. These data show for the first time that triheptanoin has an effect on central nervous system.