277 research outputs found

    Can Right Ventricular Pacing be Useful in the Assessment of Cavo-tricuspid Isthumus Block?

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    Background: Cavo-tricuspid isthmus (CTI) block is currently assessed by coronary sinus (CS) pacing or low lateral and septal atrial pacing. Occasionally, CS catheterization through the femoral route can be difficult to perform or right atrial pacing can be problematic because of catheter instability or saturation of the atrial electrograms recorded near the catheter. Objectives: Our aim was to evaluate the feasibility of assessing cavo-tricuspid isthmus block by means of right ventricular (RV) pacing in patients with ventriculo-atrial conduction, comparing it with CS pacing.Methods: Circumannular activation was analyzed during CS and RV pacing in consecutive patients in sinus rhythm undergoing CTI ablation for typical atrial flutter. Patients without ventriculo-atrial conduction were excluded from the study. The linear lesion was created during RV pacing and split atrial signals on the ablation line were analyzed. CTI block was confirmed by analyzing local electrograms on the line of block and circumannular activation during CS and RV pacing. Results: Out of 31 patients, 20 displayed ventriculo-atrial conduction (64%) and were included in the study. Before ablation, during RV stimulation, the collision front of circumannular activation shifted counterclockwise in contrast with the pattern observed during CS pacing. After ablation, circumannular activation was similar during CS and RV pacing, showing fully descending lateral right atrium activation, even if double potentials registered on the ablation line were less widely split during RV pacing than CS pacing (111±26 ms vs 128±30 , p=0.0001).Conclusions: In patients with ventriculo-atrial conduction, tricuspid annulus activation during CS and RV pacing is similar, before and after CTI ablation. The occurrence of split atrial electrograms separated by an isoelectric interval registered on the line of block can be detected during CS or RV pacing. In patients with difficult CS catheterization via the femoral vein, before trying the subclavian or internal jugular route, if retrograde ventriculo-atrial conduction is present, RV pacing can be an easy trick to assess isthmus block

    Treatment of perinfarction recurrent ventricular fibrillation by percutaneous pharmacological block of left stellate ganglion

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    A patient suffering from an acute myocardial infarction presented on the seventh and eighth days of hospitalization recurrent episodes of ventricular fibrillation refractory to antiarrhythmic treatment. The life-threatening ventricular fibrillation was suppressed by percutaneous pharmacological block of the left stellate ganglion

    Comportamento quimiometabólico do músculo sóleo na fase aguda da imobilização articular

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    The purpose of this study was to outline a physiological profile of the soleus muscle during the acute phase of joint immobilization at a 90º position. Male Wistar rats were divided into four groups (n=6): Control (C), immobilised for 1 (Im1), 2 (Im2), and 3 (Im3) days. After the experimental period, the soleus muscle was obtained in order to assess: glycogen content, muscle weight, hydration index, and protein-DNA interactions. Data were statistically analysed and significance level set at pO objetivo foi avaliar o perfil fisiológico do músculo sóleo na fase aguda da imobilização articular na posição de 90o. Ratos Wistar foram divididos em 4 grupos (n=6 cada): controle (C), imobilizado por 1 (Im1), 2 (Im2) e 3 dias (Im3). Após o período experimental, o músculo sóleo foi retirado e foram mensurados: o peso muscular, o índice de hidratação, a concentração de glicogênio e a concentração de DNA/proteínas totais. Os dados foram submetidos a análise estatística, com nível de significância fixado em

    Real-Time Microbiology Laboratory Surveillance System to Detect Abnormal Events and Emerging Infections, Marseille, France

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    International audienceInfectious diseases are a major threat to humanity, and accurate surveillance is essential. We describe how to implement a laboratory data–based surveillance system in a clinical microbiology laboratory. Two historical Microsoft Excel databases were implemented. The data were then sorted and used to execute the following 2 surveillance systems in Excel: the Bacterial real-time Laboratory-based Surveillance System (BALYSES) for monitoring the number of patients infected with bacterial species isolated at least once in our laboratory during the study periodl and the Marseille Antibiotic Resistance Surveillance System (MARSS), which surveys the primary β-lactam resistance phenotypes for 15 selected bacterial species. The first historical database contained 174,853 identifications of bacteria, and the second contained 12,062 results of antibiotic susceptibility testing. From May 21, 2013, through June 4, 2014, BALYSES and MARSS enabled the detection of 52 abnormal events for 24 bacterial species, leading to 19 official reports. This system is currently being refined and improved

    AVALIAÇÃO MOLECULAR E QUÍMICA DA PFAFFIA SPP. (GINSENG- BRASILEIRO) COMERCIALIZADO NO MERCADO BRASILEIRO POR DNA BARCODING E CROMATOGRAFIA EM CAMADA DELGADA

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    Plantas da espécie Pfaffia são amplamente comercializadas em território nacional e são popularmente conhecidas como Ginseng-brasileiro. Porém, a falta de identificação correta das espécies comercializadas tem gerado fraudes no comércio e expondo a população ao risco, fazendo-se necessário desenvolvimento de novas metodologias de identificação. Nesse projeto, identificou-se  geneticamente, utilizando o código de barras de DNA, e quimicamente, utilizando a técnica de Cromatografia em Camada Delgada (CCD) espécimes de Ginseng-brasileiro vendidas no mercado nacional e comparaou com espécimes de referências botanicamente identificadas. Foi possível identificar fraude na venda dos fitoterápicos em questão em pelo menos três amostras comerciais, as quais continham uma espécie diferente da descrita no rótulo. As metodologias de análise por CCD e DNA barcoding foram complementares, e podem ser propostas como alternativa no controle de qualidade destes fitoterápicos

    Vagotomia modifica o efluxo do cálcio nas ilhotas pancreáticas

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    The participation of the parasympathetic nervous system in insulin secretion modulation is clearly evident during the cephalic phase that follows the sensorial stimulus provoked by food in the mouth. The objective of this study was to evaluate if selective subdiaphragmatic vagotomy of the pancreatic branch could alter 45Ca2+ permeability in the plasmatic membrane of pancreatic cell. To assess the effects of vagotomy, we used glucose and the potentializer carbamylcholine on the glucose effects. Analysis of 45Ca2+ efflux was accomplished in isolated islets by digestion with collagenase and perfused with KREBS and carbamylcholine in rats from groups control and denervaded. After 15 and 30 days of the pancreatic branch vagotomy, the isolated islets did not respond to a glucose stimulus of 16,7 mM and also presented alteration in carbamylcholine sensibility (CCh 100μm) when added to the solution containing 5,6 mM of glucose. Our results suggest that the vagus nerve (pancreatic branch) contributes with regulation of insulin secretory process of pancreatic β cells. This effect could be associated to the modulation of responses induced by glucose and the regulation of acetylcholine, a neurotransmitter modulator of insulin secretion.A participação do sistema nervoso parassimpático na modulação da secreção de insulina manifesta-se claramente durante a fase cefálica que se segue ao estímulo iniciado pelo estímulo sensorial provocado pela presença do alimento na cavidade oral. O objetivo deste trabalho foi avaliar se a vagotomia subdiafragmática seletiva do ramo pancreático poderia modificar a permeabilidade ao Ca2+ da membrana plasmática das células beta. Para avaliar os efeitos da vagotomia usamos o principal secretagogo que é a glicose e o potencializador carbamilcolina. Os estudos de efluxo de 45Ca2+ foram realizados em ilhotas de ratos controle ou desnervados isoladas por digestão com colagenase e perfundidas com KREBS contendo os secretagogos. As ilhotas isoladas de ratos 15 e 30 dias após a vagotomia do ramo pancreático não responderam ao estímulo com 16,7 mM de glicose e também apresentaram alteração na sensibilidade à carbamilcolina (CCh 100μm) adicionada à solução contendo 5,6 mM de glicose. Nossos resultados sugerem que o nervo vago (ramo pancreático) participa da regulação do processo secretório da insulina pelas células beta pancreáticas. Este efeito pode estar associado à modulação da respostas induzidas pela glicose e reguladas pelo neurotransmissor acetilcolina, considerado modulador da secreção de insulina.

    Flutuação populacional de Glycaspis brimblecombei e seu parasitoide Psyllaephagus bliteus e Thaumastocoris peregrinus em plantações de eucalipto.

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    O monitoramento de pragas é essencial para evitar perdas na produtividade esperada da floresta, pois atua como ferramenta importante na detecção e mensuração do seu nível populacional antes que ocasionem danos econômicos consideráveis aos silvicultores que utilizam a madeira como matéria prima. Este trabalho objetivou analisar a flutuação populacional de Glycaspisbrim blecombei e seu parasitoide Psyllaephagusbliteus, e Thaumastocoris peregrinus em plantações de eucalipto, em três regiões paulistas, nos arredores das cidades de Mogi Guaçu, São Simão e Altinópolis, em 2016. O monitoramento foi realizado por meio de armadilhas adesivas de coloração amarela com dimensões de 12,5 x 10 cm, sendo instaladas em plantios de clones hibridos entre Eucalyptus grandis x E. urophylla. As armadilhas foram substituídas a cada 30 dias, sendo realizadas a identificação e contagem dos insetos. Como resultados, observou-se uma maior incidência de G. brimblecombei em novembro, na região de Mogi Guaçu (1617 insetos) e em outubro, na região de São Simão e Altinópolis, com 3948 e 647 insetos, respectivamente. Os picos populacionais de P. bliteus ocorreram no mês de novembro, na região de Mogi Guaçu, em outubro na região de São Simão e dezembro na região de Altinópolis. Em relação a T. peregrinus houve uma maior incidência da praga no mês de dezembro para as três regiões, Mogi Guaçu (91 insetos), Altinópolis (83 insetos) e São Simão (36 insetos). O monitoramento mostrou que T. peregrinus ocorreu em períodos com maior pluviosidade, quando comparado com G. brimblecombei que ocorreu em períodos de pluviosidade mais baixa. Já em relação ao parasitoide P. bliteus, seus picos coincidiram com os da praga G. brimblecombei nas regiões de Mogi Guaçu e São Simão, o que confirma sua especificidade para a praga, mostrando relação de densidade e dependência

    Human Cytomegalovirus Tegument Protein pUL71 Is Required for Efficient Virion Egress

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    The human cytomegalovirus virion is composed of a DNA genome packaged in an icosahedral capsid, surrounded by a tegument of protein and RNA, all enclosed within a glycoprotein-studded envelope. Achieving this intricate virion architecture requires a coordinated process of assembly and egress. We show here that pUL71, a component of the virion tegument with a previously uncharacterized function, is required for the virus-induced reorganization of host cell membranes, which is necessary for efficient viral assembly and egress. A mutant that did not express pUL71 was able to efficiently accumulate viral genomes and proteins that were tested but was defective for the production and release of infectious virions. The protein localized to vesicular structures at the periphery of the viral assembly compartment, and during infection with a pUL71-deficient virus, these structures were grossly enlarged and aberrantly contained a cellular marker of late endosomes/lysosomes. Mutant virus preparations exhibited less infectivity per unit genome than wild-type virus preparations, due to aggregation of virus particles and their association with membrane fragments. Finally, mutant virus particles accumulated within the cytoplasm of infected cells and were localized to the periphery of large structures with properties of lysosomes, whose formation was kinetically favored in mutant-virus-infected cells. Together, these observations point to a role for pUL71 in the establishment and/or maintenance of a functional viral assembly compartment that is required for normal virion trafficking and egress from infected cells
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