69 research outputs found

    Anuloplastia mitral com tira de pericĂĄrdio bovino resultados de 18 anos

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    PURPOSE: Prosthetic annuloplasty rings are currently used in mitral reconstruction. Posterior annuloplasty with a bovine pericardial strip is a technique largely used in the Heart Institute of University of SĂŁo Paulo Medical School. The purpose of the study was to analyze the late results of mitral valve repair with posterior annuloplasty using a bovine pericardial strip. METHODS: Between January 1984 and December 2002, 273 patients underwent mitral valve repair with posterior pericardial annuloplasty in the Heart Institute of University of SĂŁo Paulo Medical School. One hundred and forty four (52.7%) were women and ages ranged between 1 and 76 years (38.3 ± 21.1). Rheumatic fever was present in 52.0% of the patients. Associated techniques were employed in 26.0% of the patients, and the most frequent was chordal shortening (9.2%). RESULTS: Hospital mortality was 3.3% (9 patients), with the major cause being low cardiac output (6 patients). Actuarial survival was 55.1% ± 16.8% in 18 years. During the 18-year follow-up: patients were free from the following: reoperation (59.1% ±± 13.9%, (percent +/- Standard Error), thromboembolism (97.4% ± 2.3%), hemolysis (99.2% ± 0.2%), and endocarditis (99.6% ± 1.0%). In the late follow-up period, 83.9% were classified as New York Heart Association functional class I. CONCLUSIONS: Late results with mitral valve repair with posterior annuloplasty using a bovine pericardial strip were satisfactory. The technique is feasible, reproducible, and cost effective.OBJETIVO: AnĂ©is protĂ©ticos para anuloplastia sĂŁo usados nas plĂĄsticas da valva mitral de forma rotineira. A anuloplastia posterior com tira de pericĂĄrdio bovino Ă© uma tĂ©cnica largamente utilizada no Instituto do Coração - HC - FMUSP. O objetivo deste estudo foi analisar os resultados tardios da plĂĄstica da valva mitral com a utilização desta tĂ©cnica na nossa instituição. MÉTODOS: Entre janeiro de 1984 e dezembro de 2002, 273 pacientes foram submetidos a plĂĄstica da valva mitral com anuloplastia posterior no Instituto do Coração. Foram excluĂ­dos os pacientes submetidos a outros procedimentos no anel posterior. Cento e quarenta e quatro (52,7%) eram do sexo feminino e a idade variou entre 1 e 76 anos (mĂ©dia: 38,3 ± 21,1 anos). Em 52% dos pacientes, havia histĂłria de febre reumĂĄtica. TĂ©cnicas associadas para reconstrução valvar foram empregadas em 26% dos casos, sendo a mais utilizada, o encurtamento de cordas (9,2%). RESULTADOS: A mortalidade hospitalar foi de 3,3% (9 casos). A principal causa de Ăłbito foi baixo dĂ©bito cardĂ­aco (6 pacientes). A sobrevida actuarial foi de 55,1 ± 16,8% (percent +/- Standard Error) em 18 anos, sobrevida livre de reoperação, tromboembolismo, hemĂłlise e endocardite foram respectivamente de 59,1 ± 13,9%, 97,4 ± 2,3%, 99,2 ± 0,2%, 99,6 ± 1,0% em 18 anos. No seguimento tardio, 83,9% dos pacientes se encontravam em classe funcional I (NYHA). CONCLUSÕES: ConcluĂ­mos que os resultados tardios foram satisfatĂłrios. A tĂ©cnica Ă© fĂĄcil, reprodutĂ­vel e de baixo custo

    InfluĂȘncia do refluxo bĂ­lio-pancreĂĄtico nas complicaçÔes da doença do refluxo gastro-esofĂĄgico (DRGE)

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    The reflux of duodenal content through the pylorus into the stomach is a norma lphysiologic event occurring most commonly at night but also in post-prandial periods; and itoften caused symptoms and primary diseases. However, when it’s excessive, it may bepathologic and associated with gastritis, gastric ulcers, gastric carcinoma, dyspepsia andgastric-esophageal reflux disease (GERD). The incidence and prevalence of GERD are highand it represents the main gastroenterologic disease. The patophysiology of GERD’s complications, e.g. Barrett’s Esophagus, is also related, but after the introduce of bile monitoring,some of changes of esophagus’s epithelium have been attributed by duodenal-gastricesophageal reflux (DGER). Before introducing the bilirrubin monitoring, all techniques indetecting DRGE had poor sensitivity and specificity. Recently, a new fiberoptic spectrophtometer was developed which detects DGER, and a great of controversial issues have started in literature.Parallel, experimental studies have been developed and it seems that the excessive DGER has relationship with Barrett’s Esophagus and adenocarcinoma. The aim of this study is todiscuss the controversial of literature, and to evaluate all techniques in detecting DGER(advantages, disadvantages, sensibility and specificity). We’ll discuss the real importance ofDGER in Barrett’s Esophagus and your complications.O refluxo do conteĂșdo duodenal atravĂ©s do piloro para o estĂŽmago Ă© um evento fisiolĂłgico, que ocorre predominantemente Ă  noite e no perĂ­odo pĂłs-prandial; e raramente causa sintomas e doenças primĂĄrias. Entretanto, quando excessivo, pode ser patogĂȘnico, associando-se a complicaçÔes como gastrite, Ășlcera gĂĄstrica, carcinoma gĂĄstrico, sĂ­ndromedispĂ©ptica e doença do refluxo gastro-esofĂĄgico (DRGE). A DRGE Ă© altamente prevalente e incidente, representando a principal doença dentro das afecçÔes gastroenterolĂłgicas. A fisiopatologia de suas complicaçÔes, como o esĂŽfago de Barrett, Ă© amplamente estudada e cada vez mais, modificaçÔes no epitĂ©lio esofĂĄgico sĂŁo atribuĂ­das ao refluxo duodeno-gastroesofĂĄgico(RDGE), principalmente apĂłs o advento de mĂ©todos diagnĂłsticos especĂ­ficos para o RDGE, como a espectrofotometria de bilirrubina (BilitecR). AtĂ© entĂŁo, os mĂ©todos de diagnĂłsticos se apresentavam com pouca sensibilidade e pouca especificidade, porĂ©m, com a bilimetria iniciaram-se grandes estudos, e ao mesmo tempo surgiram muitas controvĂ©rsias. Paralelamente, estudos experimentais relacionam cada vez mais a presença de excessivo RDGE com o desenvolvimento de esĂŽfago de Barrett e adenocarcinoma de esĂŽfago. Este trabalho discute as principais controvĂ©rsias desses estudos, avaliando os principais mĂ©todos de diagnĂłstico para o RDGE destacando suas vantagens, desvantagens, sensibilidade e especificidade. Discutiremos a real importĂąncia do RDGE na patogĂȘnese do esĂŽfago de Barrette suas complicaçÔes

    Evaluation of microvessel density and p53 expression in pancreatic adenocarcinoma

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    OBJECTIVE: To evaluate the prognostic significance of microvessel density and p53 expression in pancreatic cancer. METHODS: Between 2008 and 2012, 49 patients with pancreatic adenocarcinoma underwent resection with curative intention. The resected specimens were immunohistochemically stained with anti-p53 and anti-CD34 antibodies. Microvessel density was assessed by counting vessels within ten areas of each tumoral section a highpower microscope. RESULTS: The microvessel density ranged from 21.2 to 54.2 vessels/mm2. Positive nuclear staining for p53 was found in 20 patients (40.6%). The overall median survival rate after resection was 24.1 months and there were no differences in survival rates related to microvessel density or p53 positivity. Microvessel density was associated with tumor diameter greater than 3.0 cm and with R0 resection failure. CONCLUSIONS: Microvessel density was associated with R1 resection and with larger tumors. p53 expression was not correlated with intratumoral microvessel density in pancreatic adenocarcinoma

    Monitor de Eventos Arrítmicos do Marcapasso: Comparaçao com Monitorizaçao Contínua (Holter)

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    Introduçao: o Holter Ă© o mĂ©todo diagnĂłstico com maior sensibilidade e especificidade para determinar os eventos arrĂ­tmicos. O uso do prĂłprio sistema de estimulaçao como instrumento confiĂĄvel de diagnĂłstico de arritmias cardĂ­acas tem sido pouco relatado na literatura. Objetivo: analisar comparativamente os registros dos eventos arrĂ­tmicos realizados pelo marcapasso e Holter de 24 horas. MĂ©todos: foram analisados 43 portadores de marcapasso Guidant da linha Pulsar Max cĂąmara Ășnica e dupla, com idade variando entre 45 a 90 anos (mĂ©dia 71 anos) no perĂ­odo de janeiro de 2001 atĂ© junho de 2002. Todos os pacientes foram submetidos Ă  monitorizaçao pelo Holter de 24 horas e aos registros simultĂąneos pelo marcapasso. Foram analisados e comparados os seguintes parĂąmetros: registro de taquicardias atriais e ventriculares, nĂșmero de batimentos estimulados e presença de extra-sĂ­stoles. Resultados: a correlaçao entre os eventos registrados pelo Holter e marcapasso foi encontrada somente em relaçao ao nĂșmero de batimentos cardĂ­acos estimulados e Ă  presença de extra-sĂ­stoles (pConclusao: o marcapasso possui um sistema de armazenamento de eventos arrĂ­tmicos considerado eficiente apenas para documentaçao de nĂșmeros de extra-sĂ­stole e batimentos estimulados

    Monitor de Eventos Arrítmicos do Marcapasso: Comparaçao com Monitorizaçao Contínua (Holter)

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    Introduçao: o Holter Ă© o mĂ©todo diagnĂłstico com maior sensibilidade e especificidade para determinar os eventos arrĂ­tmicos. O uso do prĂłprio sistema de estimulaçao como instrumento confiĂĄvel de diagnĂłstico de arritmias cardĂ­acas tem sido pouco relatado na literatura. Objetivo: analisar comparativamente os registros dos eventos arrĂ­tmicos realizados pelo marcapasso e Holter de 24 horas. MĂ©todos: foram analisados 43 portadores de marcapasso Guidant da linha Pulsar Max cĂąmara Ășnica e dupla, com idade variando entre 45 a 90 anos (mĂ©dia 71 anos) no perĂ­odo de janeiro de 2001 atĂ© junho de 2002. Todos os pacientes foram submetidos Ă  monitorizaçao pelo Holter de 24 horas e aos registros simultĂąneos pelo marcapasso. Foram analisados e comparados os seguintes parĂąmetros: registro de taquicardias atriais e ventriculares, nĂșmero de batimentos estimulados e presença de extra-sĂ­stoles. Resultados: a correlaçao entre os eventos registrados pelo Holter e marcapasso foi encontrada somente em relaçao ao nĂșmero de batimentos cardĂ­acos estimulados e Ă  presença de extra-sĂ­stoles (pConclusao: o marcapasso possui um sistema de armazenamento de eventos arrĂ­tmicos considerado eficiente apenas para documentaçao de nĂșmeros de extra-sĂ­stole e batimentos estimulados

    The Prolyl Isomerase Pin1 Acts Synergistically with CDK2 to Regulate the Basal Activity of Estrogen Receptor α in Breast Cancer

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    In hormone receptor-positive breast cancers, most tumors in the early stages of development depend on the activity of the estrogen receptor and its ligand, estradiol. Anti-estrogens, such as tamoxifen, have been used as the first line of therapy for over three decades due to the fact that they elicit cell cycle arrest. Unfortunately, after an initial period, most cells become resistant to hormonal therapy. Peptidylprolyl isomerase 1 (Pin1), a protein overexpressed in many tumor types including breast, has been demonstrated to modulate ERalpha activity and is involved in resistance to hormonal therapy. Here we show a new mechanism through which CDK2 drives an ERalpha-Pin1 interaction under hormone- and growth factor-free conditions. The PI3K/AKT pathway is necessary to activate CDK2, which phosphorylates ERalphaSer294, and mediates the binding between Pin1 and ERalpha. Site-directed mutagenesis demonstrated that ERalphaSer294 is essential for Pin1-ERalpha interaction and modulates ERalpha phosphorylation on Ser118 and Ser167, dimerization and activity. These results open up new drug treatment opportunities for breast cancer patients who are resistant to anti-estrogen therapy. © 2013 Lucchetti et al

    Primary neuroendocrine neoplasm of the esophagus – Report of 14 cases from a single institute and review of the literature

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    Search for gravitational-lensing signatures in the full third observing run of the LIGO-Virgo network

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    Gravitational lensing by massive objects along the line of sight to the source causes distortions of gravitational wave-signals; such distortions may reveal information about fundamental physics, cosmology and astrophysics. In this work, we have extended the search for lensing signatures to all binary black hole events from the third observing run of the LIGO--Virgo network. We search for repeated signals from strong lensing by 1) performing targeted searches for subthreshold signals, 2) calculating the degree of overlap amongst the intrinsic parameters and sky location of pairs of signals, 3) comparing the similarities of the spectrograms amongst pairs of signals, and 4) performing dual-signal Bayesian analysis that takes into account selection effects and astrophysical knowledge. We also search for distortions to the gravitational waveform caused by 1) frequency-independent phase shifts in strongly lensed images, and 2) frequency-dependent modulation of the amplitude and phase due to point masses. None of these searches yields significant evidence for lensing. Finally, we use the non-detection of gravitational-wave lensing to constrain the lensing rate based on the latest merger-rate estimates and the fraction of dark matter composed of compact objects
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