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Jepsson, Karin. "Endovaskulär aortaaneurysm reparation (EVAR) jämfört med öppen kirurgi av aorta : En litteraturstudie." Thesis, Örebro universitet, Institutionen för hälsovetenskap och medicin, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:oru:diva-29331.
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Bakgrund: Bukaortaaneurysm (AAA) har under de senaste tjugo åren blivit allt vanligare både när det gäller förekomst och diagnostisk upptäckt. Oftast är sjukdomen symtomfri och upptäcks ofta först när det rupturerar. AAA behandlas med antingen endovaskulär aortaaneurysm reparation (EVAR), öppen kirurgi av aorta (ÖA), farmakologiskt eller inte alls. Syfte: Syftet var att se hur mortaliteten och komplikationerna ser ut efter EVAR jämfört med ÖA och vilka olika kort- respektive långsiktiga för- och nackdelar som finns med de olika metoderna. Metod: Sökning av artiklar gjordes i databasen PubMed. Totalt valdes 10 artiklar ut som var baserade på 6 olika studier. Resultat: Majoriteten av dödsfallen som skedde inom 30 dagar hos ÖA-patienterna var aneurysmrelaterade och fler än inom EVAR. Efter 2-3 år syntes inte längre någon signifikant skillnad mellan de två patientgrupperna. Under operationen hade ÖA-patienter högre blodförlust, mer blodtransfusion samt längre tid i respirator efter operationen än patienterna i EVAR-gruppen. Implantatrelaterade komplikationer var vanligare vid EVAR, medan ärrbråck var vanligt hos ÖA-patienter. Konklusion: Under de första 30 dagarna efter operation och upp till ett år efter är mortalitets- och komplikationsrisken signifikant lägre hos EVAR-patienterna. Komplikationer och risk för endoläckage, ruptur trots operation och reinterventioner blir dock vanligare hos EVAR-patienterna med tiden.
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Runling, André. "Evar : En produktutveckling och formgivning av cykelbelysning med LED som ljuskälla." Thesis, Karlstads universitet, Avdelningen för maskin- och materialteknik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-26576.
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Evar är ett examensarbete, om 22,5 HP individuellt utfört av André Runling under våren 2012 vid Karlstads universitet, till högskoleingenjörsprogrammet i innovationsteknik och design. Uppdragsgivare för projektet har varit Johan Larsvall, industridesigner och ägare av Idesign i Stockholm. Handledare på Karlstads universitet har varit Lennart Wihk, industridesigner och universitetsadjunkt. Examinator har varit Fredrik Thuvander, professor och universitetslektor. Idesign är en designbyrå med kontor på Långholmen i centrala Stockholm och har uppdrag för olika företag inom olika branscher, bland annat Silva Sweden AB och myndigheten Trafikverket. Idesign har Trafikverkets uppdrag att komma med förslag på koncept till cykelbelysning för ökad användning och tillförlitlighet mot dagens användning. Projektet har initierats av Trafikverket och Idesign skall stå för utvecklingen av en belysning åt Silva. Silva har specialiserat sig på pannlampor i många år och ser en möjlighet att nå en ny marknad av cykelbelysning med samarbetet, vilket föranledde detta examensarbete och en utvecklingsprocess mot Idesign i första hand. Projektets första del gick ut på att undersöka vad som brister med dagens cykelbelysning och varför den inte används i så stor utsträckning. Undersökningen gjordes i form av enkäter och diskussioner på svenska forum på internet. En stor del av projektet innebar att jämföra varför användningen ser annorlunda ut och används oftare i Danmark och även Tyskland. Tyskland har ett detaljerat typgodkännande av cykelbelysning i trafikförordningen som behövde tydas. Med hjälp av den insamlade informationen påbörjades en utveckling av ett koncept till en belysning med idégenerering och kravspecifikation som sedan skulle utvärderas med matriser. Med ett mål och tanke om att den den skall andas enkelhet och tilltala en person som pendlar på cykel. Av de tre koncept som presenterades för Idesign valdes ett koncept ut för vidare bearbetning som utvecklades till ett slutligt förslag och beskrivning på en cykelbelysning. Det förslag som utvecklades innebär att lampan fram blir batteridriven som meddelar med en batteriindikator när den bör laddas, direkt i ett eluttag. Med ett enkelt handgrepp ansluts den i ett fäste på cykeln som i sin tur är ett spänne som monteras fast steglöst på cykeln med en rem. Det innebär att den kan monteras på vilken cykel som helst. Medan lampan bak är tänkt att alltid sitta på, ha samma typ av montering och ha automatisk på- och avslagning via en ljus- och rörelsedetektor. Den har fortfarande en batteriindikator för att se när batterier bör bytas. Både fram och baklampan är utrustade med LED-belysning.Evar is a project degree of 22,5 ECTS credits individually carried out by André Runling during the spring of 2012 at Karlstad University, for a bachelor degree in Innovation technique and Design engineering. The assigner for this project is Johan Larsvall, industrial designer and owner of Idesign in Stockholm. Academic supervisor at Karlstad University has been Lennart Wihk, industrial designer and university lecturer. Examiner has been Fredrik Thuvander, professor and university lecturer. Idesign is a design agency with office on Longholmen in central of Stockholm and is assigned by different companies in different sectors such as, Silva Sweden AB and Trafikverket. Idesign got the task from Trafikverket to make suggestions to concepts of bike lights that increase the use and reliability compared to todays use. The project was initiated by Trafikverket while Idesign were responsible of developing a bike light to Silva. Silva has specialised themselves in head lamps for many years and have seen an opportunity to reach a new market with the collaboration, which resulted in this degree project and development primary to Idesign. The projects first part was to study what is inadequate in today's lighting and why it is not used as much as it should. The study was conducted with a poll and discussions on Swedish forums on the internet. A large part of the project was to compare why the usage looks different and is used more often in Denmark, and also Germany. Germany has a detailed approval of bicycle lights in their traffic regulations which was needed to be interpreted. Using the information gathered, a development of concepts started to a bicycle light that exudes simplicity and appeal to a commuting cyclist, with the idea generation method and product specification which was evaluated in a matrix. Of three concepts that were presented to Idesign, one concept was selected for further processing which developed into a final proposal and description of a bicycle light. The final solution means that the head lamp is powered by a battery, and notifies with a battery indicator when it needs charging, directly into a electrical outlet. With a simple single-hand grip it’s connected in the bracket and, in its turn a buckle, which is mounted steplessly on the bicycle by a strap. It means it can be mounted on any bicycle. While the rear light is supposed to always sit on, have the same type of installation and have an automatic on and off switch via a light and motion detector. It still has a battery indicator to se when batteries should be replaced. Both the front and the rear light is equipped with LED for lighting.
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Lilja, Fredrik. "Evaluation of the Prostar XL vascular closuredevice used in EVAR procedures." Thesis, Uppsala universitet, Medicinska fakulteten, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-210469.
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Alencar, Ana Ellen Valentim de. "AvaliaÃÃo do uso de polÃmero EVA, resÃduo da indÃstria de calÃados (EVAR) e aditivos no desempenho reolÃgico de ligante asfÃltico de petrÃleo." Universidade Federal do CearÃ, 2009. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=5322.
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Conselho Nacional de Desenvolvimento CientÃfico e TecnolÃgicoO desenvolvimento de novas metodologias no campo da engenharia rodoviÃria tem sido uma preocupaÃÃo, visando à melhoria da qualidade das vias pavimentadas, tornando-as mais seguras e resistentes. Algumas inovaÃÃes introduzidas nesta Ãrea tem sido praticadas com a aplicaÃÃo de ligantes asfÃlticos (LAs) modificados, que tem demonstrado melhorar o desempenho destes, contribuindo para a reduÃÃo da formaÃÃo das trilhas de roda e das trincas tÃrmicas. Neste estudo, o ligante asfÃltico (LA) brasileiro oriundo do Campo Fazenda Alegre foi modificado por copolÃmero de etileno e acetato de vinila (EVA) virgem, resÃduo da indÃstria de calÃados (EVAR) e fibra de coco (FC). Aditivos, como o lÃquido da castanha de caju (LCC) e o Ãleo extensor (OE) foram utilizados para melhorar a compatibilidade da mistura. O polÃmero e os aditivos foram caracterizados atravÃs de espectroscopia no infravermelho, termogravimetria e calorimetria exploratÃria diferencial. A avaliaÃÃo dos espectros FTIR dos ligantes apÃs envelhecimento simulado em estufa RTFOT, mostraram que os ligantes modificados com EVAR e EVA/FC foram mais resistentes ao processo oxidativo, provavelmente, devido à presenÃa de aditivos, como o carbonato de cÃlcio, na composiÃÃo do resÃduo. As curvas termogravimÃtricas dos LAs modificados apresentaram comportamento semelhante ao ligante puro. As propriedades reolÃgicas tambÃm foram avaliadas atravÃs de ensaios em: viscosÃmetro e reÃmetro de cisalhamento dinÃmico (DSR). O envelhecimento, de maneira geral, provoca aumento da rigidez e da viscosidade, porÃm as curvas mestras indicaram que o efeito do envelhecimento à mais expressivo nas temperaturas intermediÃrias a altas, e aumentaram a elasticidade ao longo do espectro de frequÃncias. A viscosidade zero shear (ZSV) obtida pelos modelos de Cross e Williamson apresentou-se mais elevada do que o modelo de Carreau. AlÃm disso, as imagens obtidas no microscÃpio de forÃa atÃmica (MFA) mostraram que o polÃmero EVA intumesceu devido à absorÃÃo de fraÃÃo aromÃtica do ligante, rompendo a estabilidade coloidal. Assim sendo, a adiÃÃo do Ãleo extensor preveniu a separaÃÃo de fases. Para o ligante modificado com EVAR, a mistura apresentou boa estabilidade à estocagem somente apÃs adiÃÃo de Ãleo extensor. A presenÃa do LCC e OE mostrou melhorar a susceptibilidade tÃrmica dos ligantes modificados.
The development of new methodologies in the field of road engineering has been a concern, aimed to the improvement of the quality of paved roads making them safer and more durable. Some innovations introduced in this area have been practiced with the application of modified asphalt binder (AB), demonstrated to improve asphalt binder performance, contributing to the reduction of the formation of wheel tracks and of thermal cracking. In this study, the Brazilian asphalt binder from Fazenda Alegre oil reserve was modified by virgin ethylene vinyl acetate copolymer (EVA), residue of the industry of footwears (EVAR) and coir fiber (CF). Additives, such as the cashew nut shell liquid (CNSL) and extensor oil (EO) were used to improve the compatibility of the mixture. The polymer and additives were characterized by means of infrared spectroscopy, termogravimetry and diferencial scanning calorimetry. The evaluation of the spectra FTIR of the binders after simulated aging in RTFOT, showed that the modified binders with EVAR and EVA/FC were more resistant to oxidative hardening, probably due to the presence of the additive, in the composition of the residue, such as the calcium carbonate. The termogravimetry curves of the modified ABs presented behavior similar to the pure binder. The rheological properties were also evaluated by tests with the viscometer and the dynamic shear rheometer (DSR). In general, ageing causes an increase in stiffness and viscosity, however the master curves indicated that the effect of aging is most significant in the intermediate to high temperatures and increases the elasticity along the spectrum of frequencies. The zero shear viscosity (ZSV) obtained by the models of Cross and Williamson was higher than the Carreau model. In addition atomic force microscopy (AFM) images were obtained in the showed that the EVA polymer sweeling suggest that part of the maltenic fraction of the binder was absorbed by the polymer. For the binder modified with EVAR, the mixture showed good stability only after the addition of the extensor oil. The presence of CNSL and EO improved the thermal susceptibility of the modified binders.
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Alencar, Ana Ellen Valentim de. "Avaliação do uso de polímero EVA, resíduo da indústria de calçados (EVAR) e aditivos no desempenho reológico de ligante asfáltico de petróleo." reponame:Repositório Institucional da UFC, 2009. http://www.repositorio.ufc.br/handle/riufc/11139.
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ALENCAR, A. E. V. Avaliação do uso de polímero EVA, resíduo da indústria de calçados (EVAR) e aditivos no desempenho reológico de ligante asfáltico de petróleo. 2009. 163 f. Dissertação (Mestrado em Química Inorgânica) - Centro de Ciências, Universidade Federal do Ceará, Fortaleza, 2009.Submitted by José Jairo Viana de Sousa (jairo@ufc.br) on 2014-10-15T20:06:48Z No. of bitstreams: 1 2009_dis_aevalencar.pdf: 4649669 bytes, checksum: cd9993ca9e69c7d4041c1c70b4efb035 (MD5)
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The development of new methodologies in the field of road engineering has been a concern, aimed to the improvement of the quality of paved roads making them safer and more durable. Some innovations introduced in this area have been practiced with the application of modified asphalt binder (AB), demonstrated to improve asphalt binder performance, contributing to the reduction of the formation of wheel tracks and of thermal cracking. In this study, the Brazilian asphalt binder from Fazenda Alegre oil reserve was modified by virgin ethylene vinyl acetate copolymer (EVA), residue of the industry of footwears (EVAR) and coir fiber (CF). Additives, such as the cashew nut shell liquid (CNSL) and extensor oil (EO) were used to improve the compatibility of the mixture. The polymer and additives were characterized by means of infrared spectroscopy, termogravimetry and diferencial scanning calorimetry. The evaluation of the spectra FTIR of the binders after simulated aging in RTFOT, showed that the modified binders with EVAR and EVA/FC were more resistant to oxidative hardening, probably due to the presence of the additive, in the composition of the residue, such as the calcium carbonate. The termogravimetry curves of the modified ABs presented behavior similar to the pure binder. The rheological properties were also evaluated by tests with the viscometer and the dynamic shear rheometer (DSR). In general, ageing causes an increase in stiffness and viscosity, however the master curves indicated that the effect of aging is most significant in the intermediate to high temperatures and increases the elasticity along the spectrum of frequencies. The zero shear viscosity (ZSV) obtained by the models of Cross and Williamson was higher than the Carreau model. In addition atomic force microscopy (AFM) images were obtained in the showed that the EVA polymer sweeling suggest that part of the maltenic fraction of the binder was absorbed by the polymer. For the binder modified with EVAR, the mixture showed good stability only after the addition of the extensor oil. The presence of CNSL and EO improved the thermal susceptibility of the modified binders.
O desenvolvimento de novas metodologias no campo da engenharia rodoviária tem sido uma preocupação, visando à melhoria da qualidade das vias pavimentadas, tornando-as mais seguras e resistentes. Algumas inovações introduzidas nesta área tem sido praticadas com a aplicação de ligantes asfálticos (LAs) modificados, que tem demonstrado melhorar o desempenho destes, contribuindo para a redução da formação das trilhas de roda e das trincas térmicas. Neste estudo, o ligante asfáltico (LA) brasileiro oriundo do Campo Fazenda Alegre foi modificado por copolímero de etileno e acetato de vinila (EVA) virgem, resíduo da indústria de calçados (EVAR) e fibra de coco (FC). Aditivos, como o líquido da castanha de caju (LCC) e o óleo extensor (OE) foram utilizados para melhorar a compatibilidade da mistura. O polímero e os aditivos foram caracterizados através de espectroscopia no infravermelho, termogravimetria e calorimetria exploratória diferencial. A avaliação dos espectros FTIR dos ligantes após envelhecimento simulado em estufa RTFOT, mostraram que os ligantes modificados com EVAR e EVA/FC foram mais resistentes ao processo oxidativo, provavelmente, devido à presença de aditivos, como o carbonato de cálcio, na composição do resíduo. As curvas termogravimétricas dos LAs modificados apresentaram comportamento semelhante ao ligante puro. As propriedades reológicas também foram avaliadas através de ensaios em: viscosímetro e reômetro de cisalhamento dinâmico (DSR). O envelhecimento, de maneira geral, provoca aumento da rigidez e da viscosidade, porém as curvas mestras indicaram que o efeito do envelhecimento é mais expressivo nas temperaturas intermediárias a altas, e aumentaram a elasticidade ao longo do espectro de frequências. A viscosidade zero shear (ZSV) obtida pelos modelos de Cross e Williamson apresentou-se mais elevada do que o modelo de Carreau. Além disso, as imagens obtidas no microscópio de força atômica (MFA) mostraram que o polímero EVA intumesceu devido à absorção de fração aromática do ligante, rompendo a estabilidade coloidal. Assim sendo, a adição do óleo extensor preveniu a separação de fases. Para o ligante modificado com EVAR, a mistura apresentou boa estabilidade à estocagem somente após adição de óleo extensor. A presença do LCC e OE mostrou melhorar a susceptibilidade térmica dos ligantes modificados.
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Esteves, Marques Nicole [Verfasser]. "EVAR Implantation bei infrarenalem Aortenaneurysma mittels Zenith Flex AAA Endovascular Graft / Nicole Esteves Marques." Bonn : Universitäts- und Landesbibliothek Bonn, 2017. http://d-nb.info/1139118706/34.
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Hassan, Baderkhan. "Endovascular aortic aneurysm repair: Aspects of follow-up and complications." Doctoral thesis, Uppsala universitet, Kärlkirurgi, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-334369.
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Endovascular aortic aneurysm repair (EVAR) is the procedure of choice in most patients with abdominal aortic aneurysm. The drawbacks of EVAR are a higher rate of complications and frequent need for reinterventions, requiring regular postoperative follow-up. Non-stratified follow-up may have a deleterious effect on patients and the health care system. The aim of this thesis is to develop strategies that can stratify the EVAR follow-up programme according to an individual patient´s risk profile. Study I, an international multicentre study of all abdominal aortic aneurysm (AAA) patients with EVAR in three centres (2000 to 2011) demonstrated a lower rate of late complications and reinterventions in patients with sac shrinkage during the first postoperative year, compared to the non-shrinkage group. Study II, an international multicentre study of patients treated for a ruptured aortic aneurysm with EVAR in three centres (2000 to 2012) demonstrated that ruptured EVAR (rEVAR) in patients with hostile anatomy is associated with a high rate of graft-related complications, reinterventions and increased overall mortality. Study III, a two-centre cohort study of 326 patients with EVAR (2001 to 2012), with first postoperative computerised tomographic angiography (CTA) within one year of the operation. Patients with adequate proximal and distal sealing zones and no endoleak in the first postoperative CTA had significantly lower risk for AAA-related complications and reinterventions up to five years postoperatively. Study IV, studied all complications and reinterventions in a two-centre cohort study of all EVAR patients (1998 to 2012), One-fourth of the patients in the study developed complications during a mean follow-up of five years. Most complications were asymptomatic imaging-detected. Ultrasound could detect most of the clinically significant complications.
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Cecchini, Federico. "Angiografia con CO2: definizione di parametri di pressione con iniettore Angiodroid, per il trattamento endovascolare degli aneurismi in aorta addominale." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2017.
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Gli aneurismi dell’aorta addominale (EVAR) sono una delle cause principali di morte al mondo. L’uso di endoprotesi rappresenta una valida alternativa alla tradizionale chirurgia aperta ed è al momento la metodologia più utilizzata per il trattamento di tali patologie. L'angiografia è un esame radiologico che consente la visualizzazione di determinati distretti vascolari al fine di studiarne morfologia e decorso e svelarne possibili alterazioni. L’uso della CO2 come mezzo di contrasto alternativo a quello iodato sta prendendo sempre più campo negli ultimi anni, ma ad oggi, la maggior parte delle tecniche prevede iniezioni attraverso un’operazione di tipo manuale, in cui non è possibile esercitare alcun controllo sulla pressione d’iniezione del gas. L'iniettore Angiodroid ha permesso di standardizzare tale processo consentendo di settare con precisione i parametri di iniezione. L’obiettivo di questo lavoro è quello di definire delle metodologie per calcolare i parametri di pressione, che possano essere utilizzati in futuro all’interno di un protocollo per l’utilizzo dell’iniettore Angiodroid, nel trattamento di EVAR. Il lavoro è stato sviluppato in due fasi: una fase di studio per comprendere i principi dell'angiografia e le proprietà della CO2 nel sistema vascolare attraverso l'osservazione diretta di procedure in sala operatoria. La seconda caratterizzata da un'attività di sperimentazione su un simulatore meccanico di aorta addominale, in laboratorio. I risultati ottenuti hanno dimostrato come attraverso misure specifiche riguardanti la resistenza idraulica dei cateteri e della linea monouso dell’iniettore Angiodroid e le grandezze endovascolari, sia possibile prevedere particolari situazioni di riempimento vascolare con la CO2. La definizione di parametri di iniezione oggettivi rappresenta una necessità, per poter rendere l’imaging con CO2 sempre più attendibile e ridurre l’utilizzo di mezzi di contrasto nefrotossici salvaguardando la salute del paziente.
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Gindre, Juliette. "Simulation spécifique patient de la réponse mécanique de la structure vasculaire à l'insertion d'outils lors d'une chirurgie EVAR." Thesis, Lyon, 2016. http://www.theses.fr/2016LYSEI052/document.
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Dans ce travail de thèse, on s’intéresse au traitement endovasculaire de l’anévrisme de l’aorte abdominale (EVAR). Cette technique mini-invasive couramment utilisée et connaît une croissance importante depuis 10 ans. Elle repose sur l’exclusion du sac anévrismal par le déploiement au niveau de l’anévrisme d’une ou plusieurs endoprothèses introduites par voies fémorales. Au cours de l’intervention, plusieurs types d’outils de rigidité variable sont introduits pour permettre la navigation de l’endoprothèse. La structure vasculaire subit alors des déformations importantes. Ces déformations sont en général sans incidence sur le bon déroulement de l’intervention. Cependant dans certains cas, notamment pour les patients présentant des anatomies défavorables (fortes tortuosités ou angulations, important degré de calcification, longueur importante des artères iliaques communes et externes) les déformations produites par l’insertion des guides rigides peuvent avoir des conséquences sur le déroulement de l’intervention. Actuellement leur anticipation repose principalement sur l’expérience du chirurgien. La simulation mécanique semble être un outil adapté pour fournir des indicateurs plus objectifs et utiles au praticien lors du planning de son intervention : cette pratique permettrait en guidant et sécurisant le geste chirurgical de diminuer potentiellement les risques de complications peropératoires et postopératoires. La première étape du travail a consisté à développer un modèle mécanique de la structure aorto-iliaque et une méthode de simulation permettant de répondre au problème mécanique posé. Ce modèle a été paramétré de façon patient-spécifique à partir des données préopératoires disponibles. Puis la deuxième étape du travail a consisté à valider la modélisation développée en la confrontant à des données peropératoires réelles obtenus sur 28 cas de patients opérés au CHU Rennes. L’ensemble des méthodes développées à enfin été intégré à un module de démonstration du logiciel EndoSize® (Therenva, France)Endovascular Aneurysm Repair (EVAR) is a mini-invasive technique that is commonly used to treat Abdominal Aortic Aneurysms (AAA). It relies on the exclusion of the aneurysm sac by introducing one or more stent-grafts through the femoral arteries and deploying them inside the aneurysm. During the procedure, several tools of varying stiffness are introduced to enable the delivery of the stent graft to its deployment site. During this process, the vascular structure undergoes major deformations. Usually, these have no consequence on the smooth progress of the procedure. However, in some instances, particularly when the patient presents an unfavorable anatomical profile (major tortuousness or angulation, deep calcification, long length of the common and external iliac arteries), the deformation caused by the insertion of stiff guidewires can have major consequences. Today, their prediction relies mainly on the surgeon’s experience. Numerical simulation appears to be an appropriate tool to give the practitioner more objective and more useful indicators when planning the procedure: guiding the surgical act and making it safer using such an approach would potentially reduce the risks of intraoperative and postoperative complications. In the first step of the work, we developed a mechanical model of the aorto-iliac vascular structure and a simulation methodology to answer the mechanical problem. This patient-specific model has been parametrized based on available preoperative data. Then the second step of the work consisted in the validation of this model by confronting the simulation results to real intraoperative 3D data that were collected on 28 cases of patients operated at the University Hospital of Rennes. All the methods that were developed during this PhD were integrated in demonstration module of EndoSize® software (Therenva, France)
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Schnell, Oliver Sven [Verfasser], and Sebastian Eike [Akademischer Betreuer] Debus. "Therapie des abdominellen Aortenaneurysmas : Vergleich zwischen EVAR und offener Operation. / Oliver Sven Schnell. Betreuer: Sebastian Eike Debus." Hamburg : Staats- und Universitätsbibliothek Hamburg, 2016. http://d-nb.info/1111039194/34.
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Eichler, Anna Katharina [Verfasser]. "Lebensqualität in der infrarenalen Aortenchirurgie - Ein Vergleich des offenen, infrarenalen Aortenersatzes (OAR) mit der perkutanen Stentprothesenimplantation (EVAR) / Anna Katharina Eichler." Kiel : Universitätsbibliothek Kiel, 2019. http://d-nb.info/1177033275/34.
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Wemmert, Ellinor. "Comparison of two Fluoroscopic Systems used for EVAR Procedures : an Approach to Analyze X-ray Image Quality Limited to Tube Output." Thesis, KTH, Skolan för teknik och hälsa (STH), 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-150429.
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Image quality in medical x-ray imaging is dependent on the characteristics of the x-ray photons produced by the x-ray tube, the detection of the x-ray photons in the detector and the image processing. X-ray image guidance during endovascular interventions is usually performed with C-arm fluoroscopy. It is of major importance that the image quality is sufficient for the procedure. The understanding of what affects the image quality could be made easier if the performance of the different parts of the system were to be judged separately, rather than considering the system as a whole. The term Image QualityTube Output that is used throughout this thesis describes the image quality that only depends on the characteristics of the x-ray beam, such as spectral distribution and fluence, without the consideration of detector characteristics or image processing. The aim of this thesis was to propose a method to evaluate the Image QualityTube Output and then compare two different fluoroscopy systems used for endovascular interventions with respect to Image QualityTube Output, patient dose and personnel exposure, all as a function of patient thickness. To limit to the x-ray tube output a third x-ray system was used. In that way detector and image processing would be the same and the differences in image quality would only be due to the tube output. The imaging parameters set by the Automatic Dose Rate Control, ADRC, for various patient thicknesses, was found by using Polymethyl-methacrylate, PMMA, as patient. A test object was introduced and exposed together with the PMMA of varying thickness, using the parameters set by the ADRC. The images were evaluated with respect to low contrast sensitivity and contrast to noise ratio, CNR. The effective dose rate to the patient was calculated using Monte Carlo simulation. Finally, the personnel exposure was measured using active dosimeters. The results showed differences in the systems performance and Image QualityTube Output. Also interesting differences in the effective dose rate to the patient was found. Altogether the results indicate that the proposed method is a feasible way to compare the Image QualityTube Output of two fluoroscopic systems.
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Antonsson, Tobias, and Patrik Pettersson. "POSTOPERATIV LIVSKVALITET EFTER GENOMGÅNGEN OPERATION AV ABDOMINELLT AORTAANEURYSM : - En integrativ litteraturöversikt." Thesis, Mittuniversitetet, Avdelningen för omvårdnad, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-33855.
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Bakgrund: Abdominellt aortaaneurysm (AAA) är en sjukdom där aortan blir utvidgad och riskerar att rupturera. Två operationsmetoder finns mot AAA, dessa är endovaskulär aneurysmbehandling (EVAR) och öppen operation OR.Syfte: Studiens syfte var att undersöka samt belysa hur livskvaliteten blev påverkad bland patienter som genomgått en öppen operation gentemot endovaskulär behandling för AAA.Metod: Designen av studien var integrativ litteraturöversikt och databaserna PubMed och Cinahl användes för datainsamling. Sökord som använts var av relevans för studiens syfte och 15 artiklar kvalitetsgranskades och var sedan tillämpade i studiens resultat.Resultat: Genomgången operation med EVAR eller OR har en negativ påverkan på livskvalitet. Symtom postoperativt påverkade patienter på ett sätt som de inte var förberedda på. Återhämtningsperioden postoperativt var längre än förväntat och ledde till oro och ångest hos patienterna. Kommunikation mellan vårdpersonal och patienter visade sig vara bristfällig.Diskussion: God smärtlindring, ett gott näringstillstånd, tillräckligt med vila och sömn samt delaktighet i sin vård ansågs vara förutsättningar för optimalt läkande.Slutsats: Postoperativ livskvalitet efter genomgången AAA operation visade sig bli negativt påverkad av olika faktorer, exempelvis undernäring, postoperativ smärta och sömnpåverkan. Det var bristande informationsutbyte mellan patienter och vårdpersonal postoperativt. Vården bör bli mer patientcentrerad för att vården och livskvaliteten skall kunna förbättras för AAA patienter postoperativt.Godkännande datum: 2018-04-19
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Dösch, Janine Dorothee [Verfasser], Richard [Gutachter] Kellersmann, and Ralph [Gutachter] Kickuth. "Ergebnisse von 100 konsekutiven endovaskulären Aneurysmaausschaltungen (EVAR) mit dem Endurant® - Stentgraft unter klinischen Alltagsbedingungen / Janine Dorothee Dösch ; Gutachter: Richard Kellersmann, Ralph Kickuth." Würzburg : Universität Würzburg, 2019. http://d-nb.info/1175881783/34.
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Abdelhamid, Mohamed Farouk Aly. "The short and medium term effects of endovascular aneurysm repair (EVAR) on coagulation, fibrinolysis and renal function in patients with abdominal aortic aneurysms." Thesis, University of Birmingham, 2017. http://etheses.bham.ac.uk//id/eprint/7581/.
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Background: Previous reports described activation of the haemostatic mechanism in patients with abdominal aortic aneurysm (AAA). Both open and endovascular repair of AAA affect the haemostatic markers. Cystatin C is sensitive endogenous marker of renal function that is strongly associated with cardiovascular outcomes. Aim: To establish the medium-term effects of endovascular and open aneurysm repair on coagulation, fibrinolysis and renal function. Patients and Methods: Twenty-nine patients completed twelve months follow-up after EVAR, eleven patients were recruited after they had open aneurysm repair and eight age-matched control were recruited. Patients were tested for markers of coagulation, fibrinolysis and renal function pre-operatively and at 1, 6 and 12 months post-operatively. Results: Pre-operatively, PF1+2 levels were significantly higher in patients with AAA. PF1+2 levels post-EVAR and post-OAR were significantly lower than pre-operative values and similar to AMC. There was no significant difference in TAT, PAI, or t-PA between AMC, AAA preoperatively, and post-EVAR. Post-OAR, PAI activity was significantly higher than pre-operatively. 24 hours after procedure, a significant increase in Cystatin C and serum creatinine (sCr) and significant decrease in eGFR were seen. Cystatin C increased significantly at 1, 6 and 12 months. Conclusion: AAA is associated with increased thrombin generation without up-regulation of fibrinolysis. The pro-thrombotic, hypo-fibrinolytic diathesis returns toward normal in the medium term after EVAR and OAR. EVAR is associated with a significant increase in Cystatin C 24 hours after the procedure and is maintained for 12 months. sCr and eGFR show significant change at 24 hours.
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Davies, Robert. "The short term effects of Endovascular Aneurysm Repair (EVAR) on coagulation and cardiovascular morbidity and mortality in patients with infra-renal Abdominal Aortic Aneurysms." Thesis, University of Birmingham, 2012. http://etheses.bham.ac.uk//id/eprint/3727/.
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OBJECTIVE: Patients undergoing open repair of asymptomatic abdominal aortic aneurysms (AAA) demonstrate a prothrombotic state that initially deteriorates in the peri-operative period before improving beyond the pre-operative state. We hypothesised that a similar haemostatic improvement occurs following endovascular AAA repair (EVAR) and that the initial prothrombotic derangement may increase the risk of myocardial injury. METHODS: 60 patients[57 men; median(IQR) age, 77 (72-82) years] underwent EVAR. Patients were assessed at baseline, 24-hours and 1-month post-procedure. Thrombin-antithrombin III-complex (TAT), tissue-plasminogen activator (t-PA) and plasminogen activator inhibitor (PAI-1), and soluble (s) P-selectin levels were assessed as biomarkers of coagulation, fibrinolysis and platelet activity, respectively. Cardiac Troponin T (cTnT) levels were assessed as a biomarker of myocardial injury (MI). RESULTS: An increase in sP-selectin levels occurred between baseline[median(IQR), 80.5(68-128) ng/ml], 24-hours[median(IQR), 89.5(73-112)ng/ml; p=0.003] and 1-month[median(IQR), 110(89-143)ng/ml; p=<0.0001] post-EVAR. There was a trend towards increased TAT levels at 24-hours[median(IQR), 21.65(13-33.1)μg/l; p=0.069] compared to pre-operation[median(IQR), 7.15(4.7-31.3)μg/l] followed by a significant decrease at 1-month[median(IQR), 8.1 (5.4-14.85)μg/l; p=<0.0001]. cTnT levels were raised (>0.03ng/ml) in 16% of patients. There was a positive correlation between cTnT and TAT levels at 24-hours post-EVAR(r=0.38, p=0.039, Kendall-tau-B=0.26) CONCLUSION: These novel data suggest that the peri-operative pro-thrombotic state following EVAR may be associated with an increased risk of MI.
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Schnitzbauer, Michael [Verfasser], René [Akademischer Betreuer] Müller-Wille, and Karin [Akademischer Betreuer] Pfister. "Follow-up Computertomographie (CT) nach endovaskulärer Aneurysmareparatur (EVAR) der abdominellen Aorta: Diagnostische Genauigkeit von Diametermessungen zum Nachweis von Aneurysmasackvergrösserungen / Michael Schnitzbauer ; René Müller-Wille, Karin Pfister." Regensburg : Universitätsbibliothek Regensburg, 2020. http://d-nb.info/1215906048/34.
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Gottschau, Jana Katharina [Verfasser]. "Endovaskuläre, perkutane Behandlung des Aortenaneurysmas (EVAR): Berechnung eines prognostischen Vorhersagewertes für das Auftreten von Komplikationen und Reinterventionen anhand verschiedener prä- und postinterventioneller Parameter / Jana Katharina Gottschau." Hamburg : Staats- und Universitätsbibliothek Hamburg Carl von Ossietzky, 2020. http://nbn-resolving.de/urn:nbn:de:gbv:18-ediss-95254.
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Gulotta, Elena. "Sviluppo di un modello ad elementi finiti per lo studio del numero di coil da utilizzare per un'embolizzazione patient-specific dell'aneurisma dell'aorta addominale a seguito di intervento EVAR." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020.
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L’aneurisma dell’aorta addominale è una patologia molto diffusa (circa 38 casi su 100.000) che colpisce prevalentemente gli uomini sopra i 65 anni. Il trattamento terapeutico previsto in alternativa alla chirurgia a cielo aperto è la riparazione mediante tecnica mininvasiva endovascolare dell’aneurisma (EVAR), che può essere accompagnata o meno dall’embolizzazione della sacca aneurismatica, per prevenire il rischio di endoleak. Diverse sono le tecniche utilizzate per la trombizzazione; una delle più comunemente applicate prevede l’inserimento endovascolare di coil tramite catetere di rilascio. Risulta particolarmente critico stabilirne il numero ottimale da usare.
Lo scopo di questa Tesi è quello di sviluppare un modello ad elementi finiti patient specific di un aneurisma dell’aorta addominale, sottoposto a EVAR, per simularne l’embolizzazione tramite coil, così da avere uno strumento per guidare il chirurgo nella scelta del loro numero ottimale, sulla base di valutazioni legate all’anatomia specifica del paziente, al Peak Wall Stress e alla posizione che le stesse possono occupare, al fine di evitare il rischio di rottura.
Lo studio è partito dalla simulazione del comportamento a memoria di forma di una singola spirale, modellata con elementi Linea, rilasciata dal catetere nel vuoto, e successivamente si è impostato il sistema completo con l’aneurisma. A quest’ultimo è stato assegnato un comportamento iperelastico isotropo ed è stato modellato con tre geometrie diverse, partendo da un semplice cilindro fino ad arrivare a quella patient specific.
I risultati ottenuti sono la base per ulteriori simulazioni che consentiranno di assumere per le pareti dell’aneurisma un comportamento non più rigido e di incrementare progressivamente il numero di coil per modellarne il deployment, cosa che non è stata possibile in questa fase principalmente per i limiti dell’hardware usato (in particolare della scheda grafica), che avrebbe richiesto tempi computazionali troppo lunghi.
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Matthiensen, Sarah [Verfasser], Markus [Akademischer Betreuer] Kleemann, and Kyoung-Ryul Julian [Akademischer Betreuer] Chun. "Machbarkeit und Genauigkeit der Herstellung von patientenindividuellen Gefäßphantomen mittels Rapid Prototyping im Rahmen des Nav-CARS EVAR Projektes / Sarah Matthiensen ; Akademische Betreuer: Markus Kleemann, Kyoung-Ryul Julian Chun." Lübeck : Zentrale Hochschulbibliothek Lübeck, 2020. http://d-nb.info/1217040331/34.
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von, Sachsen Sandra. "Einsatz numerischer Simulationen für einen Vergleich von Stentgrafts in der endovaskulären Gefäßmedizin." Doctoral thesis, Universitätsbibliothek Leipzig, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-178083.
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Der Einsatz numerischer Simulationen zur Bearbeitung klinischer Fragestellungen ist eine innovative Vorgehensweise. Im Rahmen der vorliegenden Arbeit wurde eine Methode zur Auswertung von Ergebnissen einer Finite-Elemente-Analyse zum Stentgraftverhalten konzipiert, implementiert und im Rahmen einer deutschlandweiten Benutzerstudie getestet. Für einen Vergleich unterschiedlicher Stentgraftkonfigurationen im Kontext mit dem patientenspezifischen Gefäß wurden Stentgraftbewertungsgrößen eingeführt. Hierzu gehören die Fixierungskraft und der Kontaktstatus zwischen Stentringen und Blutgefäßbestandteilen. Für eine Bereitstellung der Ergebnisgrößen im gefäßmedizinischen Arbeitsumfeld wurde eine graphische Mensch-Maschine-Schnittstelle entwickelt. Diese ermöglicht eine quantitative und qualitative Auswertung von Stentgraftbewertungsgrößen. Hierfür wurden Module zur automatisierten Auswertung von Fixierungskräften sowie zur 2D- und 3D- Ergebnisvisualisierung implementiert. Im Rahmen der Benutzerstudie wurde die Anwendung der entwickelten Methode für die Ermittlung des Einsatzpotenzials numerischer Simulationen zur Unterstützung der Stentgraftauswahl demonstriert. Im Ergebnis wurde als wesentliches Einsatzpotenzial die Festlegung eines Mindestmaßes an Überdimensionierung, die Optimierung der Schenkellänge sowie der Ver- gleich unterschiedlicher Stentgraftdesigns ermittelt. Weiterhin konnten grundlegende Anforderungen an ein System zur Generierung und Bewertung von Stentgraftkonfigurationen im klinischen Alltag definiert werden. Zu den wesentlichen Funktionen, die der Implanteur für einen Vergleich von Stentgrafts benötigt, zählen eine Übersichtskarte zu farbkodiertem Migrationsrisiko pro Stentgraft und Landungszone, die Visualisierung des Abdichtungszustandes der Stentkomponenten sowie die Darstellung von Stentgraft- und Gefäßdeformationen im 3D-Modell.
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Eriksson, Mats-Ola. "Aspects on Imaging and Endovascular Treatment of Aortic Dissection and Aneurysm." Doctoral thesis, Uppsala universitet, Enheten för radiologi, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-187464.
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Aortic aneurysm and dissections are potentially life threatening conditions. The advent of endovascular aortic repair (EVAR) and thoracic endovascular aortic repair (TEVAR) has reduced perioperative mortality and morbidity and are now established therapy methods for treatment of aortic disease. Adequate pre- and intraoperative imaging is important for optimal results in endovascular procedures. However, the standard use of CT and angiography may not always be sufficient to provide necessary information required for treatment, and complementary techniques are warranted in selected cases. TEVAR in acute complicated type B aortic dissections is proven effective in several reports, but long-term clinical outcome and aortic remodelling are still not fully evaluated. Intravascular phased array imaging (IPAI) was used in patients undergoing EVAR and TEVAR for aortic aneurysm and dissection. The combined information from IPAI and fluoroscopy allowed exact positioning of the stent graft. The colour Doppler function facilitated detection of blood-flow in relevant arteries during and after the procedures, and it also facilitated control of ceased flow in excluded false lumens or aneurysms. Clinical early and long-term results after TEVAR for acute complicated type B aortic dissection were investigated in all patients treated between 1999 and 2009 at UppsalaUniversityHospital. Results were favourable regarding survival and permanent neurological complications. Long-term follow-up of aortic morphological changes in the same patient group showed overall significant reduction of aortic and false lumen diameters, and an increase of true lumen diameter. Total thrombosis of the false lumen occured more often in patients with DeBakey IIIa aortic dissection, than in IIIb. In conclusion, IPAI may be a complementary tool to traditional imaging modalities in EVAR and TEVAR in selected cases. Long-term clinical outcome is excellent with favourable aortic remodeling after TEVAR in patients with acute complicated type B aortic dissection.
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Veitinger, Sandra [Verfasser], Holger [Akademischer Betreuer] Rupprecht, and Holger [Gutachter] Rupprecht. "Vergleich von „Open Aneurysm Repair“ (OAR) und „Endovascular Aneurysm Repair“ (EVAR) im kurzzeitigen perioperativen Verlauf zur Behandlung des abdominellen Aortenaneurysmas beim hochbetagten Patienten / Sandra Veitinger ; Gutachter: Holger Rupprecht ; Betreuer: Holger Rupprecht." Erlangen : Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 2020. http://d-nb.info/1204257876/34.
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Giménez, Gaibar Antonio. "Análisis del control postquirúrgico del tratamiento endovascular del aneurisma de aorta abdominal mediante angiotomografía." Doctoral thesis, Universitat Autònoma de Barcelona, 2017. http://hdl.handle.net/10803/402273.
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Objetivo: Valorar la utilidad clínica del seguimiento mediante Angio-TAC a 1, 6, 12 y 24 meses tras la reparación endovascular del aneurisma de aorta abdominal (REVA) y su relación con el hallazgo de complicaciones, procedimientos secundarios, reintervenciones y morbi-mortalidad asociada al aneurisma. Se valorará si la anatomía del cuello aneurisma de aorta abdominal (AAA) (favorable o desfavorable) comporta una mayor necesidad de control.
Metodología: Estudio retrospectivo de pacientes intervenidos de AAA que se implantó una endoprótesis aórtica de baja porosidad. Periodo de reclutamiento: Enero 2006 a diciembre 2013. Se incluyeron dispositivos aorto-bilíacos, excluyendo otros dispositivos, técnicas híbridas y cirugía abierta. Registro: Complicaciones, reintervenciones, procedimientos secundarios, morbi-mortalidad. Análisis de imagen: Angio-TACs estandarizados según protocolo institucional en el preoperatorio, 1, 6, 12 y 24 meses postprocedimiento. Se utilizó un análisis descriptivo para las variables continuas; las variables categorizadas fueron valoradas mediante proporciones y frecuencia. El análisis estadístico fue realizado con χ² o el test de Fisher y la t de Student. Los tests de Kaplan-Meier y Log-Rang se utilizaron para la supervivencia de libre de reintervención y endofugas, expansión del saco, permeabilidad del injerto y mortalidad. Análisis estadísticos: paquete estadístico SPSS. Significación estadística ≤ 0,05.
Resultados: 127 pacientes con AAA (varones 96,8%). Edad media: 75,89 años (rango 51-90años). Diámetro medio aneurisma: 62,08mm (±14,16mm), 52 pacientes con cuello hostil (40,9%), 62 pacientes con aneurisma ilíaco asociado (48,8%). Éxito técnico y clínico: 100%, mortalidad 30 días: 0,8%. Seguimiento a 6, 12 y 24 meses: Tasa libre reintervención 97,6%, 96,1% y 93,7%; supervivencia global 97,6%, 96,9% y 91,3%, respectivamente.
TAC 1mes (125): 1 endofuga Ia (0,8%), 23 endofugas II (18,4%) y 2 aumentos diámetro AAA ≥5mm; comportando 2 reintervenciones (1 endofuga Ia y 1 endofuga II). TAC 6 meses (57): 1 endofuga Ia (1,8%), 11 endofugas II (19,3%), 0 incrementos de diámetro, 1 reintervención (1 endofuga Ia). TAC 12 meses (119): 2 endofugas Ia/migración (1,6%), 1 endofuga Ib (0,8%), 13 endofugas II (10,9%), 0 incremento diámetro aneurisma. TAC 24 meses (105): 4 endofugas Ia/migración (3,7%), 1 endofuga Ib (0,9%); 10 endofugas II (9,1%); 2 crecimientos saco. La tasa acumulada de complicaciones en el sellado proximal según la anatomía cuello a 1, 6, 12 y 24 meses fue: Cuello favorable: 0, 0, 0, 1,3%; cuello hostil: 1,9%, 5,2%, 6,1%, 7,7%. No hubo diferencias en reintervenciones, ni mortalidad dependiendo de la anatomía del cuello.
Conclusiones: Globalmente, los Angio-TACs realizados durante el seguimiento detectaron complicaciones en el sellado de los dispositivos, precisando procedimientos secundarios para corregirlos. A pesar de ello, estas complicaciones no fueron evidenciadas en los pacientes con anatomía de cuello favorable en los Angio-TACs de los 6 y 12 meses, incluso en presencia de endofugas tipo II, y por tanto podrían ser obviados. Por el contrario, los cuellos hostiles pueden comprometer el sellado proximal y requieren mantener controles mediante pruebas de imagen.Objective: To assess the clinical utility of follow-up with CT-scan at 1, 6, 12 and 24 months after endovascular repair of abdominal aortic aneurysm (EVAR) and its correlation with aneurysm-related findings of complications, secondary procedures, reinterventions and morbimortality. To assess the requirement of follow-up depending on the neck anatomy of aortic abdominal aneurysm (AAA). Method: A retrospective study of patients who underwent EVAR with aortic endograft. Recruitment period: January 2006 to December 2013. Inclusion criteria: Patients with elective placement of aortobiliac endografts. Exclusion criteria: Other types of devices, hybrid techniques and open surgery. Variables registered: Complications, reinterventions, secondary procedures, morbimortality. Imaging study: Preoperative CT-scan standardised according to institutional protocol, repeated at 1, 6, 12 and 24 months postoperatively. Descriptive analysis was used to assess continuous variables; categorical variables were analyzed calculating proportions and frequencies. Statistical data assessment was conducted with χ² or Fisher test and t-Student. Kaplan-Meier and Log-Rang test were used to assess the distribution of endoleak- and reintervention-free survival, sac expansion, graft patency and mortality. Statistical significance was set at ≤ 0.05. The SPSS package was used for statistical analysis. Results: 127 patients with AAA (96.8% males). Mean age: 75.89 years (range 51-90). Mean diameter of aneurysm: 62.08mm (±14.16mm), 52 patients with hostile neck (40.9%); 62 patients with associated iliac aneurysm (48.8%). Technical and clinical success: 100%; 30-day mortality: 0.8%. Follow-up at 6, 12 and 24 months: 97.6%, 96.1% and 93.7% reintervention-free rate; overall survival: 97.6%, 96.7% and 91.3%, respectively. CT-scan at 1 month (125): 1 type Ia endoleak (0.8%), 23 type II (18.4%) and 2 increased diameter ≥5mm; 2 reinterventions (1 type Ia and 1 type II). CT-scan at 6 months (57): 1 type Ia endoleak (1.8%), 11 type II (19.3%) and 0 increased diameter; 1 reintervention (1 type Ia). CT-scan at 12 months (119): 2 type Ia endoleaks/migrations (1.6%), 1 type Ib endoleak (0.8%), 13 type II endoleaks (10.9%), 0 increased diameter. CT-scan at 24 months (105): 4 type Ia endoleaks/migrations (3.7%), 1 type Ib endoleak (0.9%); 10 type II endoleaks (9.1%); 2 sac growths. The cumulative rate of proximal sealing zone-related complications according to neck anatomy at 1, 6, 12 and 24 months were: favourable neck: 0, 0, 0, 1.3%; hostile neck: 1.9%, 5.2%, 6.1%, 7.7%, respectively. No differences between neck anatomies were found in reinterventions or mortality. Conclusions: Globally, postoperative CT-scans detected complications and requirement of secondary procedures to ensure correct sealing. Nevertheless, no such complications were detected at 6 and 12-month CT-scans in patients with favourable necks, even in the presence of type II endoleaks and could therefore be omitted; but hostile necks may compromise proximal sealing and require regular imaging controls.
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Barreto, Marcello Silva. "Uma investigação sobre o impacto dos accruals na variabilidade dos resultados nos diferentes contrastes cross-sectional nas firmas brasileiras de capital aberto." reponame:Repositório Institucional do FGV, 2012. http://hdl.handle.net/10438/9925.
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The main objective of this dissertation is to investigate the impact of accruals on the corporate earnings variability (EVAR) results that influence the practical application of income smoothing in Brazilian capital market firms. Initially, it approaches the importance of financial statements that must be evidenced in compliance with accounting principles generally accepted. Its disclosure should represent the reality of the economic-financial firm to the process of decision-making of shareholders and creditors. But at certain times, managers are motivated to practice the earnings management in an attempt to reduce the variability of profits through the use of accruals. The accruals represent the difference between net income and operating cash flow. In the process for reducing results volatility managers use the practice of income smoothing that represents a smoothing of profits, reducing any distortions in the market price of the firm. In this study, the sample is formed by a group of 163 capital market firms listed on Bovespa and presenting financial information in the period 2000 to 2007, categorized by sector, using data obtained in Economática. The statistical model used for this research was the regression analysis in order to explain the different cross-sectional models. These survey results indicate that accruals are significant to explain the EVAR of Brazilian companies. Our results suggest that the identification of structural model corporate earnings variability (EVAR) in Brazilian companies should be evidenced by non-financial variables that differ from those made by U.S. firms.
Esta dissertação tem como objetivo principal investigar o impacto dos accruals na variabilidade dos resultados corporativos (EVAR) que influenciam a aplicação prática do income smoothing nas firmas brasileiras de capital aberto. Inicialmente, é demonstrada a importância das demonstrações contábeis que devem ser evidenciadas em cumprimento aos princípios contábeis geralmente aceitos. Sua evidenciação deve representar a realidade econômico-financeira da firma para o processo de tomada de decisão dos acionistas e credores. Porém, em determinados momentos, os gestores se sentem motivados a praticar o gerenciamento dos resultados contábeis na tentativa de reduzir a variabilidade dos lucros por meio da utilização dos accruals. Os accruals correspondem à diferença entre o lucro líquido e o fluxo de caixa operacional. Nesse processo de redução da volatilidade dos resultados, os gestores se utilizam da prática do income smoothing procurando reduzir eventuais distorções no preço das ações da firma. A amostra neste estudo é composta por um grupo de 163 firmas de capital aberto listadas na Bovespa e que apresentaram informações financeiras no intervalo de 2000 a 2007, categorizadas por setores através de dados obtidos na Economática. O modelo estatístico utilizado na pesquisa foi a análise de regressão para explicar os diferentes modelos de cross-sectional. Os resultados desta pesquisa indicam que os accruals são significativos para explicar a variabilidade dos resultados corporativos (EVAR) de empresas brasileiras. Além disso, nossos resultados sugerem que o modelo estrutural de identificação do EVAR nas empresas brasileiras deve ser explicado por variáveis não contábeis diferentes das que são apresentadas pelas firmas norte-americanas.
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Schulz, Monika [Verfasser]. "Welche Vorteile bietet die Fusions-Bildgebung von CEUS und Angio-CT bei post-EVAR Patienten hinsichtlich der Stent- und Aneurysmakontrolle? Eine Pilotstudie zur Etablierung der Fusions-Bildgebung zwischen Sonographie und CT-Angiographie / Monika Schulz." Ulm : Universität Ulm, 2018. http://d-nb.info/1151938149/34.
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Schnauder, Ingo. "Strömungsstruktur und Impulsaustausch in gegliederten Gerinnen mit Vorlandvegetation." Karlsruhe : Institut für Wasserwirtschaft und Kulturtechnik, Universität Karlsruhe (TH), 2004. http://www.ubka.uni-karlsruhe.de/eva/index.html.
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Singh, Anupam K. "Towards decision support models for an ungauded catchment in India : the case of Anas catchment." Karlsruhe : Institut für Wasserwirtschaft und Kulturtechnik, Universität Karlsruhe (TH), 2004. http://www.ubka.uni-karlsruhe.de/eva/index.html.
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Kim, Jong-Woo. "Mobilisierung und Immobilisierung von mineralischen Feinstkornaggregaten an Gewässersohlen." Karlsruhe : Institut für Wasserwirtschaft und Kulturtechnik, Universität Karlsruhe (TH), 2004. http://www.ubka.uni-karlsruhe.de/eva/index.html.
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Jaynes, Michael A. "Don't Ever Stop." Ohio University / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1275674470.
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Keating, Corey. "Flowing Ever Outward." Bowling Green State University / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1374621813.
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Passos, Juliana da Silva. "Entre Evas e Marias." reponame:Repositório Institucional da UFPR, 2009. http://hdl.handle.net/1884/19574.
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Dugas, Alex T. "Beauty, Ever Ancient, Ever New: The Philosophy of Beauty of Plotinus and St. Augustine." Athenaeum of Ohio / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=athe1526051732407169.
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König, Eva-Maria [Verfasser], and Eva [Gutachter] Klopocki. "Pathogenese von Kraniosynostosen / Eva-Maria König ; Gutachter: Eva Klopocki." Würzburg : Universität Würzburg, 2019. http://d-nb.info/1175881805/34.
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Lundström, Erik. "Spasticity after first-ever stroke." Doctoral thesis, Uppsala universitet, Neurologi, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-107134.
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The prevalence of spasticity after first-ever stroke is approximately 20%, but there are no data on the prevalence of disabling spasticity.The reported prevalence of pain after stroke varies between 19% and 74%, whether pain is associated with spasticity is not known. Until now, there is no health economic analysis of patients with spasticity after stroke. Methods: Two groups of patients were studied. Cohort I was a cross-sectional survey. A representative sample of 140 patients was investigated 1 year after their first-ever stroke. Spasticity was defined as ≥ 1 score on the modified Ashworth scale, disabling spasticity was defined as spasticity having such an impact that intervention, e.g. intensive physiotherapy, orthoses or pharmacological treatment, should be offered. Pain was assesed with the Visual Analogue Scale. All direct costs during one year were identified and converted into Purchasing Power Parities US dollar (PPP$). Cohort II was a prospective cohort study. Forty-nine patients were examined at day 2–10, at one month, and at six months after their first-ever stroke. Assessment and definitions were similar as for cohort I. Results: Spasticity occurs within 1 month and disabling spasticity occur within 6 months. After one year, the prevalence of spasticity was 17% and that of disabling spasticity 4%. Disabling spasticity was more frequent in the upper extremity. There was an independent effect of severe upper extremity paresis (OR 22, CI 3.9–125) and age below 65 years (OR 9.5, CI 1.5–60). The prevalence of stroke-related pain was 21% after one year. Stroke-related pain was associated with paresis (OR 3.1, 95% CI 1.2–7.7), sensory disturbance (OR 3.1, 95% CI 1.1–8.9) and depression (OR 4.1, 95% CI 1.4–13), but not with spasticity as an independent variable. The majority of the direct costs for one year (78%) were associated with hospitalization, whereas 20% was associated with municipality services. Only 1% of all direct costs were related to primary health care and 1% to medication. The mean (median, inter-quartile range) direct cost for stroke patients with spasticity was PPP$ 84 195 (72 116, 53 707) compared to PPP$ 21 842 (12 385, 17 484) for stroke patients without spasticity (P < 0.001).
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Aziz, Thomas. "EVAM, A New Revolutionary Ratio?" Thesis, KTH, Bank och finans, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-89831.
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Purpose: To investigate the usefulness of the Economic Value Added Momentum ratio and to determine if Swedish non-real estate, non-financial companies been either positively or negatively affected by their Corporate Real Estate structure from an EVAM perspective. Design/methodology/approach: Using a regression analysis composed of the OMX large and mid cap non-real estate, non-financial companies, investigates the relationship between companies’ real estate holdings and their ability to sustain a positive EVAM. The study covers the time period from 2006 to 2009 and includes 172 observations. Findings: The data showed that a negative relationship between EVAM and PPTY at the 10% real estate intensity interval might exist. However, no evidence was found that might suggest that a negative relationship between EVAM and corporate real estate holdings at the higher (15% real estate intensity) or the lower (5% real estate intensity) existed. This could suggest that companies’ that own lower percentages of real estate assets (less than 5% of PPTY) are not affecting their EVAM value and that companies’ that own larger amount of real estate (15% of PPTY or higher) are better at managing their real estate assets and thus it is not negatively impacting their EVAM. Research Implications: Real estate is reported at historical cost rather than at current fair market values. As the economy has, historically, enjoyed more periods of expansions than contractions, intuitive companies’ real estate assets are undervalued. Economic recession and booms can also dilute both the positive and negative aspects of real estate ownership. Although this investigation seeks to neutralize this phenomenon by including two periods of economic expansion and two periods of economic recession, it is unreasonable to claim that this will completely neutralize this affect. Practical Implications: The companies that have a PPTY of between 10% and 15% might be better off selling their real estate holdings or investing additional funds in real estate so as to either have a PPTY below 10% or above 15%. Companies that are in-between the 10% and 15% real estate ownership segment might not deem it cost effective to have specific real estate professionals or to invest in real estate know-how; however, the firms’ might at the same time own too much real estate, making it too costly to do nothing. Consequently, the companies could be better off deciding on a particular strategy: owning more real estate or owning less real estate. Originality/Value: Investigates if a linkage between a company’s ability to generate a positive EVAM and a company’s quantity of real estate assets exists.
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Lundström, Erik. "Spasticity after first-ever stroke." Uppsala : Acta Universitatis Upsaliensis : Univ.-bibl. [distibutör], 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-107134.
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Le, Palabe Soazig Carbonnelle Delphine. "Le patch contraceptif Evra®." [S.l.] : [s.n.], 2005. http://theses.univ-nantes.fr/thesemed/PHlepalabe.pdf.
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Heaberlin, Cliff. "Weathring the ever-changing finish /." Cincinnati, Ohio : University of Cincinnati, 2004. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=ucin1085544759.
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Nole, Aparicio Rosita Karina, Sam Patrick Martín Rivera, Criollo Dante Diego Salcedo, and Albornoz Elizabeth Tolentino. "My sweet pet for ever." Bachelor's thesis, Universidad Peruana de Ciencias Aplicadas (UPC), 2018. http://hdl.handle.net/10757/624452.
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My Sweet Pet For Ever tiene como finalidad concientizar a todas las personas que cuenten con mascota para que su recuerdo sea memorable. Los servicios están dirigidos a los amantes de las mascotas en general, brindando asesoría a cada uno de ellos en lo que son: ceremonia fúnebre, cremación, entierro y apoyo psicológico. Existen diferentes paquetes de acuerdo al alcance económico de cada dueño y contaremos con socios estratégicos para el entierro y cremación. El servicio inicia con una unidad de transporte que recogerá a la mascota fúnebre en el lugar de su deceso, luego se dirigirá al lugar donde se llevará a cabo la ceremonia fúnebre, seguida del traslado hacia el lugar de entierro en caso desee la familia, caso contrario, se entregará una urna con las cenizas de sus mascotas, el servicio básicamente es darle un digno final a la mascota.My Sweet Pet For Ever aims to raise awareness to all people who have a pet so that your memory is memorable. The services are aimed at pet lovers in general, providing advice to each of them in what they are: funeral ceremony, cremation, burial and psychological support. There are different packages according to the economic scope of each owner and we will have strategic partners for burial and cremation. The service begins with a transportation unit that will pick up the funeral mascot at the place of his death, then go to the place where the funeral ceremony will take place, followed by the transfer to the burial place if the family wishes, if necessary. otherwise, an urn will be delivered with the ashes of their pets, the service is basically to give a decent end to the pet.
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Chen, Yu. "Once Ever: A Narrative Short." ScholarWorks@UNO, 2005. http://louisdl.louislibraries.org/u?/NOD,197.
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Thesis (M.F.A.)--University of New Orleans, 2005.Title from electronic submission form. "A thesis ... in partial fulfillment of the requirements for the degree of Master of Fine Arts in the Deaprtment of Drama and Communications"--Thesis t.p. Vita. Includes bibliographical references.
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Volvovsky, Hagay(Hagay Constantin), Ray E. Reagans, and Ronald S. Burt. "When will they (ever) learn?" Thesis, Massachusetts Institute of Technology, 2020. https://hdl.handle.net/1721.1/130222.
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Thesis: S.M in Management Research, Massachusetts Institute of Technology, Sloan School of Management, September, 2020Hagay Volvovsky is the sole author of thesis. Ray Reagans and Ron Burt are professors and not authors. Cataloged from student-submitted PDF version of thesis.
Includes bibliographical references (pages 17-21).
Learning is an often given explanation for why social networks improve performance. For example, a closed network allows individuals to identify and share best practices and to coordinate joint problem solving and each is conducive for learning. Despite the widespread belief that networks affect learning, there is little direct evidence linking social networks to learning. And opposing network features are often emphasized. While some scholars have emphasized the importance of closed networks, others have highlighted networks that span structural holes, a network form that encourages divergent thinking and creative problem solving. Without direct evidence, we do not know if social networks affect learning, and if they do which network forms are most conducive for learning. We analyzed learning rates across 45 teams that varied in terms of how team members were allowed to communicate with each other. All teams exhibited evidence for learning but teams in open networks learned faster than teams in closed networks. The best teams, however, combined elements of open and closed network structures. We discuss the implications of our results for research on networks, knowledge transfer, and learning.
by Ray Reagans, Hagay Volvovsky, Ron Burt.
S.M in Management Research
S.MinManagementResearch Massachusetts Institute of Technology, Sloan School of Management
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HEABERLIN, CLIFF. "WEATHERING: THE EVER-CHANGING FINISH." University of Cincinnati / OhioLINK, 2004. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1085544759.
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Lima, Filho Marçal Rosas Florentino. "Avaliação do desempenho mecânico de protótipo executado com blocos EVA: estudo de impactos horizontais em alvenarias e suas interações com outros elementos da construção." Universidade Federal da Paraíba, 2008. http://tede.biblioteca.ufpb.br:8080/handle/tede/5452.
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The utilization of residues of the footwear s industry, especially E.V.A. residues(Ethilene Vinil Acetate) in the Civil Construction Industry has been the focus of the researches. It is known that such residues can be used as artificial aggregates instead of natural aggregates in the production of lightweight cement composites. The focus of this research is the mechanical conduct of EVA blocks (normal dimensions) isolated and applied in prisms and masonries. The EVA block was also evaluated in real scale in LABEME and compared with a soil-cement prototype and theoretical results. Tests of horizontal impacts and interactions between masonries and others elements of the building( abrupt shutting door tests and suspended pieces effects in walls) took place. Based on the results, the conclusion is that it is possible to propose blocks with 60% of EVA aggregate, substituting natural aggregates in volume, having a minimum resistance to compression over or equal 1,0 MPa (in Laboratory molding), that are confirmed compatible with the non-structural function. Thus, it s believed that the perspectives for the viability of the utilization of this residue in the manufacture of blocks for civil construction are very good. This will certainly contribute for a double reduction of negative impacts in the environment, as long as it offers an alternative destiny to such residues and a consummation reduction of natural resources (sand and hail), promoting the sustainable development for the activity of civil construction.
O aproveitamento de resíduos produzidos pela indústria de calçados (aparas da produção de solas e palmilhas obtidas a partir de mantas de E.V.A. - Etileno Acetato de Vinila) na construção civil tem sido meta de pesquisas recentes. Sabe-se que tais resíduos têm grande potencial para serem empregados como agregados artificiais sintéticos, em substituição aos agregados naturais, na elaboração de compósitos cimentícios leves. O foco desta pesquisa é o comportamento mecânico dos blocos EVA1 (dimensões convencionais) isoladamente e quando os mesmos são aplicados em prismas e alvenarias. Para o bloco EVA1 avaliou-se o desempenho de protótipo em escala real, construído no LABEME e se comparou aos resultados com o protótipo, também em escala real, executado com blocos solo-cimento e referenciais teóricos. Foram realizados nesse protótipo ensaios de impactos horizontais (corpo mole e corpo duro) nas alvenarias e ensaios de interações entre as alvenarias e outros elementos da construção (fechamentos bruscos das portas e efeito de peças suspensas na parede). Com base nos resultados obtidos, tendo em vista o atendimento aos critérios e requisitos de impactos, pode-se concluir que é possível propor blocos de vedação com 60% de agregado EVA, substituindo em volume os agregados naturais, tendo resistência à compressão mínima maior ou igual 1,0MPa (em moldagem no Laboratório), que são comprovadamente compatíveis com a função não estrutural. Assim, acredita-se que são boas as perspectivas para a viabilização do aproveitamento desses resíduos na confecção de blocos de vedação a serem aplicados nas edificações. Isso contribuirá seguramente para uma dupla redução de impactos negativos no meio ambiente, na medida em que oferece uma alternativa ao destino para tais resíduos e uma redução do consumo de recursos naturais (areia e pedrisco), favorecendo o desenvolvimento sustentável para a atividade da construção civil.
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Gerberding, Daniela. ""Memory running out of my mouth so easily, a stream of living water" : Erinnern und Erzählen in den Romanen und autobiographischen Erzählungen von Eva Figes /." Münster : Lit, 2005. http://catalogue.bnf.fr/ark:/12148/cb41273642q.
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Pauthe, Patricia. "Ever, un éditeur de v-relations." Paris 11, 1985. http://www.theses.fr/1985PA112209.
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EVER est l’éditeur de V-relations de la machine base de données VERSO. C’est un éditeur plein écran, utilisant un gestionnaire de fenêtres pour permettre d’éditer plusieurs V-relations en parallèle. EVER est écrit en C et tourne sous SMX 4. 3 sur sm90. Cette thèse est l’étude et l’application d’une méthodologie pour la conception de l’interface d’un logiciel informatique. La partie application de cette étude est la réalisation de l’éditeur EVER. Cette partie contient donc une description détaillée d’EVAR ainsi que l’implémentation de ses principales structures de donnéesEVER is the interface of the DBMS VERSO. EVER is a full screen V-relation editor. It is window oriented to process V-relations together. EVER is written in the C language and is developed on a SM90 running SMX 4. 3. This thesis presents a method to concept the interface of a software. The application of this method is the editor EVER. A comprehensive description of the editor and the implementation of its main data structures are given
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Kaminski, Emily M. "Happily Ever After & Other Myths." Miami University / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=miami1500478511202885.
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Choi, Chang Seok. "Ever-changing fragments : folio of compositions." Thesis, University of York, 2014. http://etheses.whiterose.ac.uk/13540/.
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Fragments are essential for the realisation of my musical ideas. This commentary explains the musical, aesthetical and philosophical backgrounds to my work, and also the detailed compositional processes employed. Chapter one is a brief overview of Sigimsae and main-tone as found in traditional Korean music, which subsequently become transformed in my composition through the integration with contemporary Western musical elements. Chapter two analyses six compositions in this folio to clarify how unique sounds and forms are developed and achieved through the ever-changing fragment.
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Júnior, Sant Clair Castro. "Variações da metodologia de RAROC e sua utilização para cálculo do EVA: aplicação feita em bancos brasileiros." Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/96/96133/tde-04012012-155230/.
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Nesta pesquisa foi observado os tipos de risco envolvidos nas operações de crédito dos bancos múltiplos que atuam no Brasil, foi observada a rentabilidade destes bancos com relação ao capital alocado para fazer frente aos riscos assumidos. Considerou-se o modelo de RAROC como uma medida de desempenho consistente por representar uma medida de retorno com relação ao risco do capital. Este fato ganha mais força quando são observadas as recomendações do Comitê de Basiléia, através da carta conhecida como Basiléia III. Nos dias de hoje, os bancos com atuação nacional estão passando pelo período de transição para implantação das recomendações contidas no Basiléia III. Com base nas recomendações do comitê este estudo apurou o RAROC das quatro maiores instituições bancárias que atuam no Brasil, considerando o total de ativos, respeitando o pré-requisito de possuírem ações negociadas no mercado aberto da BM&FBOVESPA. Neste estudo são abordadas diferentes metodologias para Cálculo do RAROC, se utilizando da legislação vigente e da legislação em implantação no Brasil por ocasião do Basiléia III para o cálculo da base de capital dos bancos. Definiu-se o RAROC pelo capital mínimo exigido como o modelo benchmark, logo, foi comparado o modelo benchmark com outros modelos de RAROC para perceber se existem diferenças significativas entre as metodologias, não tendo sido encontradas diferenças significativas entre as metodologias. O modelo benchmark se mostrou consistente a ponto de ser utilizado para o cálculo do EVA dos bancos selecionados na amostra para o período pesquisado. Apesar de não ser usual a utilização do RAROC para cálculo do EVA, este estudo mostra que o resultado obtido com o cálculo do RAROC também pode ser útil na apuração do EVA de instituições financeiras.In this research, the types of risks involved in the credit operations of multiple banks which operate in Brazil were observed. The profitability of those banks with relation to the allocated capital to face the risks taken was also observed. The RAROC model was considered as a consistent performance measurement since it represents a return measurement in relation to the capital risk. Such a fact gets stronger when the recommendations of the Basel Committee are considered, through the accord known as Basel III. Nowadays, the banks operating nationally are going through a transition period for the implantation of the recommendations which are in the Basel III. Based on the Committee´s recommendations, this study verified the RAROC of the four largest banking institutions which operate in Brazil, taking into account the total of the assets, respecting the pre-requirement of having stocks negotiated in the open market of the BM&FBOVESPA. In this study, different methodologies for the Calculation of the RAROC are approached, making use of the valid legislation and of the implantation legislation in Brazil due to the Basel III for the calculation of the capital base of the banks. The RAROC was defined by the minimum capital requirement as the benchmark model, so the benchmark model was compared to other RAROC models to perceive if there are significant differences among the methodologies; no significant differences were found among the methodologies. The benchmark model was consistent to the point that it was used for the Calculation of the EVA of the banks chosen in the sample for the researched period. Although the use of the RAROC for the calculation of the EVA is not usual, this study shows that the result obtained with the RAROC calculation can also be useful in verifying the EVA of financial institutions.
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Andrade, Pinelo Antonio Miguel. "Economic Value Added (EVA)." Gaceta Jurídica, 2012. http://hdl.handle.net/10757/604386.
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El presente artículo tiene por finalidad explicar al lector una de las metodologías más usadas para poder medir la creación de valor, dentro de las empresas, mostrando la importancia de medición de valor y explicando cómo realizar el cálculo respectivo.