Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 20 de 32
Filtrar
Mais filtros

Base de dados
País/Região como assunto
Tipo de documento
Intervalo de ano de publicação
1.
BMC Med Educ ; 24(1): 279, 2024 Mar 18.
Artigo em Inglês | MEDLINE | ID: mdl-38494509

RESUMO

BACKGROUND: The desire to die can occur in palliative care patients with a prevalence of up to 22%. Not every desire to die is accompanied by a pressure to act, but usually by a burden that can arise from various factors. To address this burden appropriately, health care workers should be trained. Based on an evaluated course on handling the desire to die, an elective course for medical students was developed and evaluated. In order to identify the impact of the elective course's content, a comparison of attitudes towards assisted dying with two other participant groups was conducted. Therefore, three questions from the evaluation of the elective course were used. METHOD: Online evaluation of the elective and questions addressing attitude were assessed using a five-point Likert scale. The specific outcome-based assessment was determined using the Comparative Self-Assessment Gain. The main participant group (group 1) were students who took the elective. The additional survey on attitudes towards assisted dying included undergraduate medical students who had taken compulsory palliative care courses (group 2) and physicians who had taken an introductory course in intensive care or emergency medicine (group 3). RESULTS: Group 1 (n = 13, response rate rr = 86.7%) was very satisfied with the blended learning format (100%) and the course itself (100%). They were able to deepen their knowledge (81.0%) and train skills (71.2%) through the course. In the additional surveys, there were 37 students in group 2 (rr = 66.1%) and 258 physicians in group 3 (rr = 73.6%). Willingness to assist with or accompany the various options for assisted dying varied according to the type of assistance. Among the participants, it can be summarised that the highest willingness was shown by the students of group 2 followed by the physicians of group 3 and the students of group 1. CONCLUSIONS: A course on handling the desire to die of palliative patients can deepen knowledge and train communication skills and thus support self-confidence. Dealing with the background of the desire to die, knowledge about assisted dying, but also one's own attitudes and responsibilities can influence the attitude towards assisted dying.


Assuntos
Medicina de Emergência , Estudantes de Medicina , Humanos , Cuidados Críticos , Pessoal de Saúde , Conhecimento
2.
Oecologia ; 188(1): 263-275, 2018 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-29948317

RESUMO

Detailed information on the nutrition of free-ranging mammals contributes to the understanding of life history requirements, yet is often quite limited temporally for most species. Reliable dietary inferences can be made by analyzing the stable carbon (C) and nitrogen (N) isotopic values (δ13C and δ15N) of some consumer tissues; exactly which tissue is utilized dictates the inferential scope. Steller sea lion (SSL) vibrissae are grown continuously without shedding and thus provide a continuous multi-year record of dietary consumption. We applied a novel kernel density approach to compare the δ13C and δ15N values along the length of SSL vibrissae with δ13C and δ15N distributions of potential prey species. This resulted in time-series of proportion estimates of dietary consumption for individual SSL. Substantial overlap in δ13C and δ15N distributions for prey species prevented a discrete species-scale assessment of SSL diets; however, a post hoc correlational analysis of diet proportion estimates revealed grouping by trophic level. Our findings suggest that adult female SSL diets in the western and central Aleutian Islands shift significantly according to season: diets contain a higher proportion of lower trophic level species (Pacific Ocean perch, northern rockfish, Atka mackerel and walleye pollock) in the summer, whereas in the winter SSL consume a much more diverse diet which includes a greater proportion of higher trophic level species (arrowtooth flounder, Kamchatka flounder, darkfin sculpin, Pacific cod, Pacific octopus, rock sole, snailfish, and yellow Irish lord).


Assuntos
Perciformes , Leões-Marinhos , Alaska , Animais , Dieta , Feminino , Vibrissas
3.
Schmerz ; 30(2): 174-80, 2016 Apr.
Artigo em Alemão | MEDLINE | ID: mdl-26391690

RESUMO

BACKGROUND: In 2009 palliative medicine was integrated into the undergraduate curriculum as cross-disciplinary subject 13 and is now part of mandatory education in German medical faculties (MF). Surveys across German MFs have shown an inhomogeneous development of this cross-disciplinary subject. The aim of this study was to assess the current state and the needs in terms of assessments in the cross-disciplinary subject 13 at German MFs. MATERIAL AND METHODS: Palliative care coordinators at German MFs were surveyed by using a standardized telephone interview. Closed-ended questions were analyzed by descriptive analysis and open-ended questions by content analysis. RESULTS: A total of 34 out of 36 MFs participated. Multiple choice tests were the major form of assessment (94.1%) and 9 MFs planned to implement another form of assessment, mainly an objective structured clinical examination (OSCE) station (55.5%). The majority of the MFs (91.2%) had no blueprint to develop assessments but conducted a review (78.8%) afterwards. A successful implementation of the assessment was mostly achieved when the concept of the assessment was felt to be suitable. The lack of human resources was found to be the most relevant obstacle for the implementation of a practical assessment format. CONCLUSION: The major form of assessment in palliative care is still a written examination, especially multiple choice tests. This format is considered to be of limited value for assessing communicative competencies and attitudes in palliative medical care. Further steps should include the development of a competence-based assessment that is also feasible for smaller MFs with limited resources.


Assuntos
Competência Clínica/legislação & jurisprudência , Currículo , Docentes de Medicina/legislação & jurisprudência , Comunicação Interdisciplinar , Colaboração Intersetorial , Medicina Paliativa/educação , Medicina Paliativa/legislação & jurisprudência , Alemanha , Implementação de Plano de Saúde/legislação & jurisprudência , Necessidades e Demandas de Serviços de Saúde/legislação & jurisprudência , Entrevistas como Assunto , Inquéritos e Questionários
4.
Photoacoustics ; 31: 100513, 2023 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-37275325

RESUMO

Atopic dermatitis (AD) is the most common chronic inflammatory skin disease worldwide. Its severity is assessed using scores that rely on visual observation of the affected body surface area, the morphology of the lesions and subjective symptoms, like pruritus or insomnia. Ideally, such scores should be complemented by objective and accurate measurements of disease severity to standardize disease scoring in routine care and clinical trials. Recently, it was shown that raster-scanning optoacoustic mesoscopy (RSOM) can provide detailed three-dimensional images of skin inflammation processes that capture the most relevant features of their pathology. Moreover, precise RSOM biomarkers of inflammation have been identified for psoriasis. However, the objectivity and validity of such biomarkers in repeated measurements have not yet been assessed for AD. Here, we report the results of a study on the repeatability of RSOM inflammation biomarkers in AD to estimate their precision. Optoacoustic imaging analysis revealed morphological inflammation biomarkers with precision well beyond standard clinical severity metrics. Our findings suggest that optoacoustic mesoscopy may be a good choice for quantitative evaluations of AD that are inaccessible by other methods. This could potentially enable the optimization of disease scoring and drug development.

5.
Int J Androl ; 35(6): 845-859, 2012 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-22712438

RESUMO

The defence of the male reproductive tract against microorganisms is critical for fertilization. The prostate gland has been reported to express several molecules of the innate immune system. However, little information is available about how androgens may modulate host defences within the prostate. We therefore aimed to examine in the rat the expression of the TLR4 system, which is strongly involved in pathogen recognition, and the secretion of the antibacterial substances rBD-1 and SP-D after androgen withdrawal. Immunoblotting and immunocytochemical analysis revealed a time-dependent increase in these molecules after orchiectomy, with epithelial and stromal cells being an important source of prostatic host defence proteins. In view of this, we evaluated the potential improvement in antibacterial ability of the prostatic fluid from orchiectomized animals ex vivo. Only samples from rats at 5 days post-orchiectomy showed a slight inhibition of Escherichia coli growth. Finally, E. coli was inoculated into the ventral prostate of orchiectomized or control rats, with bacterial growth being counted at 5 days after infection. Animals with androgen depletion presented a lower bacterial count, and showed few histological signs of prostatic inflammation compared with controls. In vitro studies confirmed that isolated lipopolysaccharide (LPS)-treated prostatic cells in the absence of testosterone increased SP-D. Moreover, media from these cells showed a higher antimicrobial activity than supernatants from testosterone- and LPS-treated cells. Our findings indicate that testosterone maintains a reduced expression of key elements for innate immunity and diminishes the antibacterial ability of the rat prostate. These data may represent an important mechanism underlying the immunosuppressive activity of testosterone in the gland. However, this immunosuppressive function of androgens is understandable as a means of avoiding uncontrolled immune responses against the haploid male gamete in the reproductive tract.


Assuntos
Antagonistas de Androgênios/uso terapêutico , Infecções Bacterianas/imunologia , Próstata/imunologia , Animais , Imuno-Histoquímica , Masculino , Próstata/microbiologia , Ratos , Ratos Wistar
6.
Prostate ; 70(13): 1402-12, 2010 Sep 15.
Artigo em Inglês | MEDLINE | ID: mdl-20687213

RESUMO

BACKGROUND: Benign prostatic hyperplasia (BPH) represents the most frequent proliferative abnormality of the human prostate. In spite of the well-characterized architectural development of BPH, little is known about the cellular and molecular events that contribute to it. METHODS: We have developed an animal model to evaluate the follow-up of hormone-induced BPH and the analysis of the gene expression associated with BPH. Immunohistochemistry on human patient samples validated the BPH-related molecular alterations. RESULTS: Canine specific Affymetrix microarray analysis performed on sequential biopsies obtained from a beagle dog dynamic model characterized a number of genes altered during the onset of BPH. In addition to the genes involved in calcification, matrix remodeling, detoxification, cell movement, and mucosa protection (MGP, MMP2, TIMP2, ITIH3, GST, MT2A, SULT1A1, FKBP1B, MUC1, STRBP, TFF3), the up-regulation of TGFB3 and CLU indicated a complete adjustment of the transdifferentiation, senescence and apoptosis programs. The up-regulation of Clusterin was validated by RT-qPCR and immunohistochemistry, both in the dog dynamic model and in human samples, further confirming the suitability of the animal model for the study of the molecular alterations associated with BPH. CONCLUSIONS: Transcriptome analysis performed on a dynamic animal model that accurately mimicked the human clinic, allowed us to characterize a gene expression pattern associated with the onset of BPH.


Assuntos
Apoptose/genética , Próstata/metabolismo , Hiperplasia Prostática/genética , Animais , Diferenciação Celular/genética , Clusterina/genética , Clusterina/metabolismo , Cães , Expressão Gênica , Perfilação da Expressão Gênica , Regulação Neoplásica da Expressão Gênica , Imuno-Histoquímica , Masculino , Análise de Sequência com Séries de Oligonucleotídeos , Próstata/patologia , Hiperplasia Prostática/metabolismo , Hiperplasia Prostática/patologia , Reação em Cadeia da Polimerase Via Transcriptase Reversa
7.
J Magn Reson ; 310: 106662, 2020 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-31837553

RESUMO

In EPR, spin relaxation is typically governed by interactions with the lattice or other spins. However, it has recently been shown that given a sufficiently strong spin-resonator coupling and high resonator quality factor, the spontaneous emission of microwave photons from the spins into the resonator can become the main relaxation mechanism, as predicted by Purcell. With increasing attention on the use of microresonators for EPR to achieve high spin-number sensitivity it is important to understand how this novel regime influences measured EPR signals, for example the amplitude and temporal shape of the spin-echo. We study this regime theoretically and experimentally, using donor spins in silicon, under different conditions of spin-linewidth and coupling homogeneity. When the spin-resonator coupling is distributed inhomogeneously, we find that the effective spin-echo relaxation time measured in a saturation recovery sequence strongly depends on the parameters for the detection echo. When the spin linewidth is larger than the resonator bandwidth, the different Fourier components of the spin echo relax with different characteristic times - due to the role of the resonator in driving relaxation - which results in the temporal shape of the echo becoming dependent on the repetition time of the experiment.

8.
Seizure ; 67: 30-37, 2019 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-30870707

RESUMO

PURPOSE: To investigate the very long-term (i.e., ≥15 years) seizure, cognitive and psycho-social outcomes in resected patients (RP) with TLE compared to control patients not having undergone epilepsy surgery. METHODS: We applied a multiple case-study design including three non-resected patients (NRP) who were compared to a group of six RP. The latter were matched to the NRP according to clinical-demographic data. Outcome measures were various seizure, cognitive, and psycho-social variables. RESULTS: Patients were 56-72 years old. Seizure and AED outcome was more favourable among RP. RP reported better self-perceived overall health but higher subjective memory complaints. Upon formal neuropsychological testing, RP presented with lower verbal memory scores. Very long-term memory decline was evident in left-sided RP with good baseline memory scores, while RP with lower baseline performance, right-sided RP and NRP remained stable. Seizure-freedom had remarkable effects on the relationship between objective and subjective outcome: seizure-free patients, in general, subjectively reported the best psychosocial and cognitive outcome - irrespective of neuropsychological test results. CONCLUSION: Our study suggests positive effects of TLE surgery in the very long-term course of ≥15 years postoperatively. Long-term seizure-freedom appears to have the strongest impact on patients' subjectively perceived psycho-social and cognitive outcome and may even outweigh actual memory disturbances and/or decline. Overall, our data do not support the assumption of a generally accelerated cognitive decline in patients with TLE.


Assuntos
Epilepsia do Lobo Temporal/tratamento farmacológico , Epilepsia do Lobo Temporal/cirurgia , Idoso , Cognição , Depressão , Epilepsia do Lobo Temporal/psicologia , Feminino , Seguimentos , Humanos , Masculino , Memória , Transtornos da Memória/etiologia , Pessoa de Meia-Idade , Complicações Pós-Operatórias , Qualidade de Vida , Convulsões/tratamento farmacológico , Convulsões/psicologia , Convulsões/cirurgia , Fatores de Tempo , Resultado do Tratamento
9.
J Steroid Biochem Mol Biol ; 108(3-5): 221-9, 2008 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-18061438

RESUMO

Endometrial carcinoma (EC) is the most common gynecological malignancy in the western world. A widely accepted dualistic model, which has been established on a morphological basis, differentiates EC into two broad categories: Type I oestrogen-dependent adenocarcinoma with an endometrioid morphology and Type II non-oestrogen-dependent EC with a serous papillary or clear cell morphology. Molecular genetic evidence indicates that endometrial carcinoma, as described in other malignancies, likely develops as the result of a stepwise accumulation of alterations in cellular regulatory pathways, such as oncogene activation and tumor suppressor gene inactivation, which lead to dysfunctional cell growth. These molecular alterations appear to be specific in Type I and Type II cancers. In type I endometrioid endometrial cancer, PTEN gene silencing in conjunction with defects in DNA mismatch repair genes, as evidenced by the microsatellite instability phenotype, or mutations in the K-ras and/or beta-catenin genes, are recognized major alterations, which define the progression of the normal endometrium to hyperplasia, to endometrial intraepithelial neoplasia, and then on to carcinoma. In contrast, Type II cancers show mutations of TP53 and Her-2/neu and seem to arise from a background of atrophic endometrium. Nevertheless, despite the great effort made to establish a molecularly-based histological classification, the following issues must still be clarified: what triggers the tumor cells to invade the myometrium and what causes vascular or lymphatic dissemination, finally culminating in metastasis? RUNX1, a transcription factor, was recently identified as one of the most highly over-expressed genes in a microarray study of invasive endometrial carcinoma. Another candidate gene, which may be associated with an initial switch to myometrial infiltration, is the transcription factor ETV5/ERM. These studies, as well as those conducted for other genes possibly involved in the mitotic checkpoint as a major mechanism of carcinogenesis in non-endometrioid endometrial cancer, could help in understanding the differences in the biology and the clinical outcome among histological types.


Assuntos
Carcinoma Endometrioide/genética , Neoplasias do Endométrio/patologia , Adenocarcinoma/patologia , Adenocarcinoma de Células Claras/patologia , Subunidade alfa 2 de Fator de Ligação ao Core/genética , Cistadenocarcinoma Papilar/patologia , Reparo de Erro de Pareamento de DNA , Feminino , Genes erbB-2/genética , Genes p53/genética , Genes ras/genética , Humanos , Instabilidade de Microssatélites , Neoplasias Hormônio-Dependentes/patologia , Oncogenes/genética , PTEN Fosfo-Hidrolase/genética , Receptores de Estrogênio/genética , Receptores de Progesterona/genética
10.
Clin Transl Oncol ; 9(5): 272-7, 2007 May.
Artigo em Inglês | MEDLINE | ID: mdl-17525037

RESUMO

Endometrial carcinoma is the most common gynaecological malignancy in the western world and the most frequent among infiltrating tumours of the female genital tract. Despite the characterisation of molecular events associated with the development of endometrial carcinoma, those associated with the early steps of infiltration and invasion in endometrial cancer are less known. Deep myometrial invasion correlates with more undifferentiated tumours, lymph-vascular invasion, node affectation and decreased global survival. In this review we present an overview of the molecular pathology of myometrial infiltration that defines the initial steps of invasion in endometrial cancer. Down-regulation of E-cadherin as a main player of epithelial to mesenchymal transition, as well as modifications on other molecules involved in cell-cell contacts, render cells with a migratory phenotype. In addition, altered signalling pathways and transcription factors associate with myometrial invasion, histologic grade and metastasis.


Assuntos
Neoplasias do Endométrio/etiologia , Neoplasias do Endométrio/patologia , Moléculas de Adesão Celular/fisiologia , Neoplasias do Endométrio/genética , Feminino , Expressão Gênica , Humanos , Invasividade Neoplásica
11.
Biomed Tech (Berl) ; 50(11): 371-4, 2005 Nov.
Artigo em Alemão | MEDLINE | ID: mdl-16370151

RESUMO

The German Artificial Sphincter System GASS consists of a support ring which includes a fluid reservoir on the outer side and an occlusive cuff on the inner side. The cuffs are designed as polyurethane hollow bodies with a pre-determined inflation volume and are connected to an integrated piezo micropump/valve unit. To evaluate the threshold of continence, the GASS was placed around the anorectal junction via a perineal approach in one mini pig. The novel cuff design reduces the occlusion pressure and allows low compression volumes. Low operating pressures indicate a minor risk of ischemia injury of the bowel. The operation time is estimated at about 6 days with no recharging of the battery. The novel remote controlled GASS is a highly integrated prosthesis for placement around the anal canal or lower rectum and is effective in restoring continence for liquids and solids in vitro and in vivo.


Assuntos
Canal Anal/fisiopatologia , Órgãos Artificiais , Incontinência Fecal/reabilitação , Próteses e Implantes , Porco Miniatura , Telemetria/instrumentação , Terapia Assistida por Computador/instrumentação , Canal Anal/cirurgia , Animais , Análise de Falha de Equipamento , Incontinência Fecal/cirurgia , Alemanha , Desenho de Prótese , Suínos , Integração de Sistemas , Resultado do Tratamento
12.
Biomed Res Int ; 2015: 762178, 2015.
Artigo em Inglês | MEDLINE | ID: mdl-25649906

RESUMO

Nowadays prostate cancer is the most common solid tumor in men from industrialized countries and the second leading cause of death. At the ages when PCa is usually diagnosed, mortality related to cardiovascular morbidity is high; therefore, men at risk for PCa frequently receive chronic lipid-lowering and antiplatelet treatment. The aim of this study was to analyze how chronic treatment with statins, aspirin, and their combination influenced the risk of PCa detection. The tumorigenic properties of these treatments were evaluated by proliferation, colony formation, invasion, and migration assays using different PCa cell lines, in order to assess how these treatments act at molecular level. The results showed that a combination of statins and aspirin enhances the effect of individual treatments and seems to reduce the risk of PCa detection (OR: 0.616 (95% CI: 0.467-0.812), P<0.001). However, if treatments are maintained, aspirin (OR: 1.835 (95% CI: 1.068-3.155), P=0.028) or the combination of both drugs (OR: 3.059 (95% CI: 1.894-4.939), P<0.001) represents an increased risk of HGPCa. As observed at clinical level, these beneficial effects in vitro are enhanced when both treatments are administered simultaneously, suggesting that chronic, concomitant treatment with statins and aspirin has a protective effect on PCa incidence.


Assuntos
Aspirina/farmacologia , Movimento Celular/efeitos dos fármacos , Proliferação de Células/efeitos dos fármacos , Inibidores de Hidroximetilglutaril-CoA Redutases/farmacologia , Neoplasias da Próstata/epidemiologia , Idoso , Biópsia , Estudos de Casos e Controles , Linhagem Celular Tumoral , Humanos , Masculino , Próstata/patologia , Estudos Retrospectivos
13.
Comput Biol Med ; 34(4): 307-22, 2004 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-15121002

RESUMO

This paper describes a revision of the Hill-type muscle model so that it will describe the chemo-mechanical energy conversion process (energetic) and the internal-element stiffness variation (viscoelastic) during a skeletal muscle isometric force twitch contraction. The derivation of this energetic-viscoelastic model is described by a first-order linear ordinary differential equation with constant energetic and viscoelastic coefficients. The model has been implemented as part of a biomimetic model, which describes the excitation-contraction coupling necessary to drive the energetic-viscoelastic model. Finally, the energetic-viscoelastic model is validated by comparing its isometric force-time profile with that of various muscles reported in the literature.


Assuntos
Contração Isométrica/fisiologia , Modelos Biológicos , Músculo Esquelético/fisiologia , Cálcio/metabolismo , Permeabilidade da Membrana Celular/fisiologia , Simulação por Computador , Humanos
14.
Comput Biol Med ; 34(4): 323-44, 2004 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-15121003

RESUMO

This paper describes a new macroscopic, phenomenological model of the skeletal muscle excitation-contraction coupling process, as represented by four principal and consecutive compartments (biophysical, biochemical, and biomechanical phases) characteristic of isometric excitation-contraction coupling in mammalian skeletal muscle, and coupled by a system of simultaneous, first-order linear ordinary differential equations. The model is based upon biological compartmental transport kinetics and irreversible thermodynamic energy transformation, and represents a distinct improvement over other biomimetic models. The model was derived using physiological parameter data published in the literature, and validated using MATLAB R12.


Assuntos
Contração Isométrica/fisiologia , Modelos Biológicos , Músculo Esquelético/fisiologia , Cálcio/metabolismo , Permeabilidade da Membrana Celular/fisiologia , Simulação por Computador , Humanos
15.
J Neuroradiol ; 27(3): 192-5, 2000 Sep.
Artigo em Francês | MEDLINE | ID: mdl-11104967

RESUMO

We report a case of acute spinal subdural hematoma which developed then regressed spontaneously. MR imaging contributed essential information for diagnosis and follow-up after conservative treatment. We made a short review of the literature and discuss the causes, pathogenesis, clinical presentation and usual treatment of acute spinal subdural hematoma. The differential diagnosis with the more frequent and extradural hematoma requiring immediate surgical evacuation is fundamental.


Assuntos
Hematoma Subdural Agudo/diagnóstico , Imageamento por Ressonância Magnética , Idoso , Idoso de 80 Anos ou mais , Diagnóstico Diferencial , Feminino , Seguimentos , Hematoma Subdural Agudo/diagnóstico por imagem , Humanos , Mielografia , Fatores de Tempo , Tomografia Computadorizada por Raios X
16.
J Neuroradiol ; 27(2): 101-6, 2000 Jun.
Artigo em Francês | MEDLINE | ID: mdl-10970961

RESUMO

We propose to assess the usefulness of diffusion-weighted MR Imaging (DWI), fluid-attenuated inversion recovery (FLAIR) and constructive interference in steady state (CISS) sequences in depicting epidermoid cysts (EC). FLAIR, CISS and DWI were obtained in 7 patients among 22. All patients were studied with T1 and T2 sequences. On Spin Echo images, EC demonstrate signal similar to LCS, which may lead to difficult differentiation between EC and arachnoid cyst (AC), specially for inexperienced radiologists. EC appear with a heterogeneous signal on T1 images (32%), irregular limits (91%) and with extension through foramen of Pacchioni in 18% of cases. On FLAIR sequence, the tumors were heterogeneous, different from void signal of CSF in 86% of cases. On CISS sequence, the tumors appear heterogeneous, hyperintense but less than LCS and with irregular limits in all cases. Some more, CISS images allowed to appreciate exact tumor extension and their relations with nerves and vessels. On DWI images, signal is hyperintense in all cases. Our study exhibited the great usefulness of DWI, CISS and FLAIR sequences in diagnosis of EC and in differentiating EC from AC.


Assuntos
Encefalopatias/patologia , Cisto Epidérmico/patologia , Imageamento por Ressonância Magnética , Humanos , Imageamento Tridimensional
17.
J Neuroradiol ; 27(4): 218-25, 2000 Dec.
Artigo em Francês | MEDLINE | ID: mdl-11223612

RESUMO

This report describes the use of the recent three-dimensional Fourier transform constructing imaging in the steady state (CISS) MR sequence in the management of obstructive hydrocephalus. It is a gradient-echo imaging technique with high resolution which remains sensitive to flow. It enables locating the obstruction and determining the upstream impact. It provides anatomical information about third ventricle (V3) morphology and relationships useful before ventriculostomy. Twenty patients with obstructive hydrocephalus at the level of cerebral aqueduct or posterior V3 underwent sagittal 3DFT-CISS acquisition, supplemented by frontal, axial and coronal reformations in the cerebral aqueduct axis. 9 patients were examined after ventriculostomy with the same protocol. CISS-3DFT allows good visualization of the cerebral aqueduct and diagnosis of the underlying cause of obstruction (malformation, tumor), sometimes better than classical sequences. In case of complete obstruction, the flow-related signal void is usually absent in the cerebral aqueduct or V3. The position of V3 floor and its relationship with the tip of basilar artery are well analyzed. The dilatation of the anterior V3 recesses is a better sign of activity of hydrocephalus - and then of therapeutical indication - than classical transependymal resorption signs which are not always present in chronic longstanding adult hydrocephalus. Of the 9 ventriculostomy patients seven had linear flow-related signal void through V3 floor, from anterior V3 to basal cisterns on the postoperative MR study. This flow void confirms patent ventriculostomy.


Assuntos
Hidrocefalia/patologia , Hidrocefalia/cirurgia , Imageamento por Ressonância Magnética , Adolescente , Adulto , Idoso , Criança , Pré-Escolar , Feminino , Seguimentos , Humanos , Lactente , Recém-Nascido , Imageamento por Ressonância Magnética/métodos , Masculino , Pessoa de Meia-Idade , Cuidados Pós-Operatórios , Cuidados Pré-Operatórios
18.
J Neuroradiol ; 25(4): 263-7, 1998 Dec.
Artigo em Francês | MEDLINE | ID: mdl-10048269

RESUMO

UNLABELLED: To compare T2-weighted turbo spin-echo (turboSE) and turbo inversion recovery magnitude (turboIRM) sequences in the detection of multiple sclerosis of the spinal cord. METHODS: 28 patients with clinically confirmed multiple sclerosis and signs of cervical cord involvement were examined on a 1.5 tesla MR system. Sagittal T2-weighted turboSE sequences were followed by sagittal turboIRM sequences. 24 patients also underwent a cranial study. RESULTS: Using turboIRM sequence, all the patients showed at least one spinal cord plaque with a total of 91 plaques. Using turboSE sequence, 61 lesions were identified in 25 patients. Spinal plaques were seen best on turboIRM sequences with a higher contrast between the lesion and the normal spinal cord. In 10 patients with cord plaques in both sequences, the cranial study was normal or non conclusive. CONCLUSIONS: The turboIRM sequences detect more cord lesions and with a better contrast than the turboSE sequence. This results confirm those described in other studies and demonstrate the inadequacy of the fast spin echo sequences. Assessment of spinal plaques is particularly important when MR findings of the brain are negative or non conclusive.


Assuntos
Processamento de Imagem Assistida por Computador/métodos , Imageamento por Ressonância Magnética/métodos , Esclerose Múltipla/patologia , Medula Espinal/patologia , Adulto , Encéfalo/patologia , Encefalopatias/patologia , Feminino , Humanos , Aumento da Imagem , Masculino , Pessoa de Meia-Idade , Estudos Retrospectivos , Doenças da Medula Espinal/patologia
19.
Biomed Tech (Berl) ; 49(10): 274-8, 2004 Oct.
Artigo em Alemão | MEDLINE | ID: mdl-15566076

RESUMO

No highly integrated sphincter prosthesis for therapy of major fecal incontinence exists. Therefore, we developed a novel neosphincter, made of polyurethane. The GASS consists of a support ring (SR) which includes a fluid reservoir, fixed on the outer diameter of the SR, and a multi-chamber occluding cuff (C(int)) on the inside diameter. The total inflation volume of C(int) is about 23 cc. The integrated micropump based on piezotechnology measures 30x13x1 mm3 (flowrate 1.4 cc/min, max. backpressure 40,000 Pa) . GASS was evaluated around the external sphincter of isolated porcine anal canals. The threshold of continence was defined as the inflating volume which water ceased to leak through the area occluded by C(int) under an induced rectal pressure of 150 cm H2O. Minimal filling volumes maintained continence for liquids against high luminal pressures. A low intraanal resting pressure (delta p(anal)) induced by activated GASS indicates a little risk of ischemic injury of the anal canal in vivo (median delta p(anal) 24.1 mm hg:15 cc vs 46.9 mm hg:21 cc). In summary, a highly integrated and efficient high-tech neosphincter for the therapy of major fecal incontinence could be realized.


Assuntos
Canal Anal/fisiopatologia , Canal Anal/cirurgia , Órgãos Artificiais , Incontinência Fecal/fisiopatologia , Incontinência Fecal/cirurgia , Animais , Análise de Falha de Equipamento , Incontinência Fecal/reabilitação , Técnicas In Vitro , Desenho de Prótese , Suínos
20.
Actas Urol Esp ; 38(4): 232-7, 2014 May.
Artigo em Inglês, Espanhol | MEDLINE | ID: mdl-24156935

RESUMO

OBJECTIVE: To analyze the influence of sedentary (SE) and overweight (OW) in the risk of prostate cancer detection (CP) and aggressiveness. MATERIAL AND METHOD: We performed prostate biopsy (PB) to 2,408 consecutive male, 5 ARIs untreated, because of elevated serum PSA above 4.0 ng/mL (91%) or suspicious digital rectal examination (9%). In all ultrasound guided PB, 10 cores were obtained plus 2 to 8 additionals, according to age and prostate volume. Physical activity was assessed using a survey (SE vs non-SE) and calculated body mass index (normal vs OW > 25 kg/cm(2)). The tumor aggressiveness was evaluated according to the Gleason score (high grade «HG¼: Gleason > 7) and D'Amico risk (high risk «HR¼: T > 3a or PSA > 20 or Gleason score > 7). RESULTS: We found a significant association between SE (52.5%) and OW (72.9%), P < .001. The overall PC detection rate was 35.2%. In men with SE it was 36.7% and non-SE 33.6%, P = .048. The overall rate of AG tumors was 28.3%, 29.2% in men with SE and 27.1 in non-SE, P = .261. The overall rate of AR tumors was 35%, 39.7% in men with SE and 29.4% non-SE, P < .001. CP was detected in 38.1% of men with normal BMI and 34.3% in men with OW, P = .065. HG tumor rates were 18.1% and 31.4% respectively, P < .001 and AR tumor rates were 22.6% and 39.2% respectively, P < .001. Binary logistic regression showed that SE was an independent predictor of CP, OR .791 (95% CI: .625-.989), P = .030. SE and OW were independent predictors of HG: OR .517 (95% CI: .356-.752), P = .001, and OR 1.635 (95% CI: 1070-2497), p = 0.023. SE and OW were also independent predictors of HR: OR .519 (95% CI .349-.771), P = .001, and OR 1.998 (95% CI 1.281-3.115), P = .002. CONCLUSIONS: In men who met criteria for prostate biopsy an association between sedentary and overweight exist. A sedentary lifestyle is associated with increased risk of PC detection while sedentary and overweight were associated with more aggressive tumors.


Assuntos
Sobrepeso/complicações , Neoplasias da Próstata/epidemiologia , Neoplasias da Próstata/patologia , Comportamento Sedentário , Idoso , Idoso de 80 Anos ou mais , Biópsia , Humanos , Masculino , Pessoa de Meia-Idade , Neoplasias da Próstata/etiologia , Fatores de Risco
SELEÇÃO DE REFERÊNCIAS
DETALHE DA PESQUISA