3,375 research outputs found
Estudo experimental do desempenho de um novo filtro de veia cava inferior
Get PDFDissertação (mestrado) - Universidade Federal de Santa Catarina, Centro Tecnológico, Programa de Pós-Graduação em Engenharia Mecânica, Florianópolis, 2012Filtros de veia cava (FVC) são dispositivos médicos implantáveis utilizados na prevenção do tromboembolismo pulmonar (TEP). Este evento é uma desordem potencialmente fatal que ocorre em consequência do desprendimento e migração de um ou mais coágulos sanguíneos (trombos) formados no sistema venoso quando estes obstruem artérias pulmonares. Os filtros de veia cava inferior são empregados em cirurgias minimamente invasivas, ou seja, o filtro é alojado em um cateter que é conduzido por um vaso sanguíneo até a porção inferior da veia cava. O dispositivo consiste em uma estrutura cônica de hastes metálicas que se fixa na parede da veia através de sua base e tem a função de capturar coágulos sanguíneos e evitar sua chegada aos vasos pulmonares. O estudo apresentado neste trabalho é parte do processo de desenvolvimento de um novo filtro de veia cava criado pela empresa Biokyra Pesquisa e Desenvolvimento, onde foram conduzidos experimentos in vitro dos protótipos desenvolvidos. Os testes permitiram a avaliação de quatro fatores fisiológicos simulados: diâmetro da veia cava, vazão sanguínea e diâmetro e comprimento dos coágulos, através de testes de eficiência de captura e medição da pressão diferencial. A eficiência de captura é definida como a razão entre os coágulos inseridos no sistema circulatório simulado e os coágulos capturados pelo filtro e a pressão diferencial é a medida do aumento da pressão hidrostática referente à captura de coágulos pelos filtros de veia cava. Os resultados mostraram forte influência do comprimento dos trombos na eficiência de captura e considerável variação entre os diferentes filtros testados. As distintas geometrias dos filtros influenciaram os resultados de eficiência o que foi sistematicamente confirmado com testes dos variados parâmetros construtivos dos protótipos. Os experimentos permitiram a comparação entre filtros de veia cava comerciais e qualificaram os protótipos desenvolvidos para as etapas seguintes da validação dos dispositivos.Abstract : Vena cava filters (VCF) are implantable medical devices used in the prevention of the pulmonary thromboembolism (PE). This kind of event is a potentially deadly disorder which occurs in consequence of the dislodgement and migration of one or more blood clots (thrombi) formed in the deep venous system, when the clots obstruct pulmonary arteries. Inferior vena cava filters are employed in minimally invasive intervention, where the filter is housed in a catheter which is conducted through a blood vessel until the inferior portion of the vena cava. The device consists of a conical structure of metal rods fixed on the wall of the vein through its base and serves to capture blood clots preventing them of reaching the pulmonary vessels. The study presented in this paper is part of the product development process of a new vena cava filter designed by Biokyra Research and Development, where experiments were conducted for the in vitro evaluation of the developed prototypes. The test allowed evaluation of four simulated physiological factors: diameter of the vena cava, blood flow and the diameter and length of the clots by testing clot trapping efficacy and differential pressure measurement. The clot trapping efficacy is defined as the ratio of the inserted clots in the circulatory system and the simulated clot captured by the filter and the differential pressure is a measure of the increase in hydrostatic pressure caused by the clot capture in the vena cava filters. The results showed a strong influence of the length of thrombi in the clot trapping efficacy and considerable variation between the tested filters. The different geometries of the filters affected the results that were systematically confirmed with tests of various construction parameters of the prototypes. The experiments allowed comparison between vena cava filters and commercial prototypes and qualified the filters for the next stages validation tests
R.J. Sommers
Get PDFThe single-spaced paragraph on the “About the Author” page of R.J. Sommers’ latest novel says she lives in a one-story house on the edge of a city. It says she is renowned for writing relatable characters and compelling relationships. It says nothing about her own friends.
Gazing from a photo at the top of the page, R.J. Sommers appears to point a camera toward her readers..
Superior vena cava syndrome: Clinical considerations
No full textBackground: The superior vena cava syndrome (SVCS) is a rare pathological process caused by the superior vena cava obstruction (SVCO). Aim: To know the main causes of SVCS in a third level hospital. Material and methods: Observational, prospective and descriptive study in 31 patients with SVCS treated between June 2013 and December 2014. Yale, Stanford scores and tumour biopsy were obtained at diagnosis. Results: The main causes of SVCS were malignant tumours: lung cancer (22.5%) and lymphoma (16.1%). For lung cancer, the most common was non small cells (57.1%) and lymphoma was non-Hodgkin (80%). Conclusions: The main causes of SVCS are advanced malignant tumours like lung cancer and lymphomas, benign obstruction causes are relatively rare. Resumen: Antecedentes: El síndrome de vena cava superior (SVCS) es un proceso patológico poco frecuente causado por la obstrucción de la vena cava superior (VCS). Objetivo: Conocer las principales causas de SVCS en un hospital de tercer nivel. Material y método: Estudio observacional, prospectivo y descriptivo en 31 pacientes con SVCS atendidos durante junio de 2013 a diciembre de 2014. Se utilizó la escala de Yale, Stanford y biopsia de tumour al momento del diagnóstico. Resultados: La principal causa de SVCS fue por tumores malignos: cáncer broncogénico (22.5%) y linfoma (16.1%). Del cáncer pulmonar, el más común fue el de células no pequeñas (57.1%) y para el linfoma fue el no Hodgkin (80%). Conclusiones: El SVCS es principalmente ocasionado por tumores malignos avanzados como el cáncer de pulmón y los linfomas, los casos debidos a una obstrucción benigna son relativamente raros. Keywords: Superior vena cava syndrome, Superior vena cava obstruction, Claude Bernard–Horner syndrome, Palabras clave: Síndrome de vena cava superior, Obstrucción de la vena cava superior, Síndrome de Claude Bernard–Horne
Primary Leiomyosarcoma Of The Inferior Vena Cava: How Should It Be Treated And The Vein Anatomy Re-established?
No full textRetroperitoneal sarcomas are responsible for 10-15% of all sarcomas in soft tissue. Leiomyosarcoma of the inferior vena cava has a slow growth rate, and the initial symptoms are related to the affected segment of the vein. A 56-year-old woman with leiomyosarcoma of the middle segment of the inferior vena cava underwent en-block resection of the affected segment of the vena cava and the right kidney. The inferior segment of the vena cava was tied, and the superior segment was anastomosed to the left renal vein using a polyester prosthesis. The patient was followed for 14 months and did not present any postoperative intercurrence. In conclusion, the leiomyosarcoma is a rare tumor that should be surgically treated with wide margin resections in order to prevent relapses. © 2008 The Japanese Urological Association.153259260Yuzer, Y., Zeytunlu, M., Makay, O., Sozbilen, M., Yuce, G., Leiomyosarcoma of the Inferior Vena Cava: A case report (2004) Surg. Today, 34, pp. 370-73Monig, S.P., Gawenda, M., Erasmi, H., Zieren, J., Pichlmaier, H., Diagnosis, treatment and prognosis of the leiomyosarcoma of the inferior vena cava (1995) Eur. J. Surg., 161, pp. 231-5Hines, O.J., Nelson, S., Baldrich, W.J., Eilber, F.R., Leiomyosarcoma of the inferior vena cavaPrognosis and comparison with leiomyosarcoma of other anatomic sites (1999) Cancer, 855, pp. 1077-83Mingoli, A., Feldhaus, R.J., Cavallora, A., Stipa, S., Leiomyosarcoma of the inferior vena cavaAnalysis and search of world literature on 141 patients and report of three cases (1991) J. Vasc. Surg., 14, pp. 688-99Mingoli, A., Cavallaro, A., Sapienza, P., Di Marzo, L., Feldhaus, R.J., Cavallari, N., International registry of inferior vena cava leiomyosarcoma: Analysis of a world series on 218 patients (1996) Anticancer Res., 16, pp. 3201-6Sinsel, N.K., Samijn, J.P., Von Meyenfeldt, M.F., Soeters, P.B., Krause, R., Leiomyosarcoma of the inferior vena cava: Report of two cases and a plea for surgical reconstruction (1995) Eur. J. Surg., 161, pp. 365-8Kraybill, W.G., Callery, M.P., Heiken, J.P., Flye, M.W., Radical resection of tumors of the inferior vena cava with vascular reconstruction and kidney autotransplantation (1997) Surgery, 121, pp. 31-6Hollenbeck, S.T., Grobmyer, S.R., Kent, K.C., Brennan, M.F., Surgical treatment and outcomes of patients with primary inferior vena cava leiomyosarcoma (2003) J. Am. Coll. Surg., 197, pp. 575-9Kwon, T.W., Sung, K.B., Cho, Y.P., Pararenal leiomyosarcoma of the inferior vena cava (2003) J. Korean Med. Sci., 18, pp. 355-
Recommended from our members
Author Correction: Layer-dependent quantum cooperation of electron and hole states in the anomalous semimetal WTe2.
No full textCorrection to: Nature Communications; https://doi.org/10.1038/ncomms10847, published online 29 Feb 2016.
This Article contains an error in the spelling of the author A. Yazdani, which is incorrectly given as A. Yadzani. The error has not been fixed in the original PDF and HTML versions of the Article.This Article contains an error in the spelling of the author A. Yazdani, which is incorrectly given as A. Yadzani. The error has not been fixed in the original PDF and HTML versions of the Article
Author Co-Citation Analysis (ACA): a powerful tool for representing implicit knowledge of scholar knowledge workers
Get PDFIn the last decade, knowledge has emerged as one of the most important and valuable organizational assets. Gradually this importance caused to emergence of new discipline entitled ―knowledge management‖. However one of the major challenges of knowledge management is conversion implicit or tacit knowledge to explicit knowledge. Thus Making knowledge visible so that it can be better accessed, discussed, valued or generally managed is a long-standing objective in knowledge management. Accordingly in this paper author co- citation analysis (ACA) will be proposed as an efficient technique of knowledge visualization in academia (Scholar knowledge workers)
Report on industrial attachment with R.J. Crocker Consultants Pte Ltd
No full textThis report documents the undertaking of the author’s six months of industrial attachment. It was the industrial attachment that gave him the opportunity to discover the innovative skills and expertise from his fellow colleagues working the organization. Throughout the attachment, the author had learnt a great deal from various trained and experienced engineers. He had been exposed to a variety of training namely (1) reinforcement concrete design, (2) steel and connection design, (3) modelling structures for design and analysis using software, (4) visual inspections for buildings, (5) preparing tender documents, (6) drawing, presentation and attending and (7) handling online submissions for building inspections, structural plans, design calculations, etc. Furthermore, by attending project meetings, preparing materials for presentations, tendering documents and drawings to privatized companies and public sectors all bestowed the author a concrete understanding of the type and quality of work required of and produced by a qualified engineer. Without the industrial attachment, all these practical skills and knowledge might not have been attainable by learning in the university alone. It was overall a fruitful experience
Xenodusa cava
No full text<p> <b> 189. <i>Xenodusa cava</i> (LeConte)</b> </p> <p> (Illustrations in Hoebeke 1976, Klimaszewski <i>et al.</i> 2018), Table 1</p> <p> <b>References.</b> LeConte 1863. Casey 1911 (as synonyms <i>X. lobata</i> Casey and <i>X. probata</i> Casey). Hoebeke 1976. Sikes 2004. Majka <i>et al.</i> 2011.</p> <p> <b>Distribution.</b> Nearctic. <b>Canada</b>: ON. <b>USA</b>: AR, CO, CT, DC, IA, IL, IN, KS, KY, MA, MD, ME, MI, MN, MO, NE, NH, NJ, NY, OH, OK, PA, RI, VA, WV, WI.</p> <p> <b>Collection and Habitat data.</b> In NH captured in a termite nest, a carpenter ant colony/nest, and in a house. Adults collected from April to August. Elsewhere reported from ant nests of <i>Camponotus americanus Mayr</i>, <i>C. noveboracensis</i> (Fitch), <i>C. ferrugineus</i> (Fab.), <i>C. pennsylvanicus</i> (DeGeer), <i>Formica pallidefulva nitidiventris</i> Emery, <i>F. rubicunda</i> Emery, <i>F. schaufussi</i> Mayr, <i>F. exsectoides</i> Forel, <i>F. rufa</i> group, and a <i>Myrmica</i> sp. (Hoebeke 1976, Klimaszewski <i>et al.</i> 2018).</p> <p> <b>Material.</b> USA, <b>Massachusetts,</b> <i>Barnstable Co</i>.: Falmouth, Frances Crane WMA, 41.61064, -70.2507, 14.V.2015, R.A. DiGirolomo, ex. funnel trap, SPB Lure, 1 sex? (MFDC). <b>New Hampshire</b>, <i>Strafford Co.</i>: Dover, 21.V.1981, J.S. Bowman, 1 sex? Durham, 28.IV.1960, P. Dargon, 1 sex?; 23.IV.1960, P. Burleigh, 1 sex?; 14.V.1983, W.J. Morse, 1 sex?; 17.IV.1957, A. Kenneson, 1 sex?; 29.VIII.1960, W. Lee, in termite nest, 1 sex?; 11.VII.1994, W.J. Morse, in house, 1 sex?; 29.IV.1972, W.J. Morse, carpenter ant colony, 1 sex?; 13.V.1981, W.J. Morse, 1 sex?; 29.IV.1972, W.J. Morse, carpenter ant nest, 1 sex?; 13.V.1960, B. Sprague, 1 sex? <b>New York</b>, <i>Essex Co</i>.: Keene Valley, Adir [ondacks], IX.1917, G.P. Engelhardt, 1 sex? <i>Suffolk Co</i>.: Lake R’nk’ma [Ronkonkoma], L(ong) I(sland), 22.V.1922, F.M. Schott, 1 sex? CANADA. <b>Ontario</b>, Port Hope, R.J. Crew, 1 sex? Toronto, R.J. Crew, 2 sex?</p>Published as part of <i>Klimaszewski, Jan, Chandler, Donald S., Davies, Anthony & Bourdon, Caroline, 2023, Aleocharine rove beetles of New Hampshire, USA: new taxa and new records (Coleoptera, Staphylinidae, Aleocharinae), pp. 1-141 in Zootaxa 5364 (1)</i> on page 92, DOI: 10.11646/zootaxa.5364.1.1, <a href="http://zenodo.org/record/10145460">http://zenodo.org/record/10145460</a>
- …
