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Tesis sobre el tema "Aortic blood"

Autor: Grafiati
Publicado: 4 de junio de 2021
Última modificación: 21 de febrero de 2023

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1

Kattach, Hassan. "Blood pressure control in aortic stenosis." Thesis, University of Oxford, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.526473.

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2

Andresen, Jean M. "Aortic Baroreceptor Reflex Control of Blood Pressure: Effect of Fitness." Thesis, University of North Texas, 1992. https://digital.library.unt.edu/ark:/67531/metadc500922/.

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Aortic baroreflex (ABR) control of blood pressure was examined in 7 untrained (UT) and 8 endurance exercise trained (EET) young men. ABR control of blood pressure was determined during a steady state phenylephrine infusion to increase mean arterial pressure 10-15 mmHg, combined with positive neck pressure to counteract the increased carotid sinus transmural pressure, and low levels of lower body negative pressure to counteract the increased central venous pressure. Functioning alone, the ABR was functionally adequate to control blood pressure. However, ABR control of HR was significantly dimin
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3

Lantz, Jonas. "On Aortic Blood Flow Simulations : Scale-Resolved Image-Based CFD." Doctoral thesis, Linköpings universitet, Mekanisk värmeteori och strömningslära, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-85682.

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This thesis focuses on modeling and simulation of the blood flow in the aorta, the largest artery in the human body. It is an accepted fact that abnormal biological and mechanical interactions between the blood flow and the vessel wall are involved in the genesis and progression of cardiovascular diseases. The transport of low-density lipoprotein into the wall has been linked to the initiation of atherosclerosis. The mechanical forces acting on the wall can impede the endothelial cell layer function, which normally acts as a barrier to harmful substances. The wall shear stress (WSS) affects en
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4

Kordzadeh, Ali. "Blood and blood component transfusion on 30-day mortality and morbidity of infra-renal ruptured abdominal aortic aneurysm." Thesis, Anglia Ruskin University, 2017. http://arro.anglia.ac.uk/702581/.

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This thesis for the first time in the literature, through a single cohort (n=82), systematic review and meta-aggregation of the data, has identified that the majority (>85%) of ruptured abdominal aortic aneurysm (rAAA) do not present with coagulopathy. In addition, the thesis for the first time, through a retro and prospective cohort study, has demonstrated that the hemostatic resuscitation protocols derived from military and civilian trauma for the correction of coagulopathy with a blood product ratio of one unit of packed red blood cell to one unit of fresh frozen plasma to one pool of plate
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5

Kordzadeh, Ali. "Blood and blood component transfusion on 30-day mortality and morbidity of infra-renal ruptured abdominal aortic aneurysm." Thesis, Anglia Ruskin University, 2017. https://arro.anglia.ac.uk/id/eprint/702581/1/Kordzadeh_2017.pdf.

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This thesis for the first time in the literature, through a single cohort (n=82), systematic review and meta-aggregation of the data, has identified that the majority (>85%) of ruptured abdominal aortic aneurysm (rAAA) do not present with coagulopathy. In addition, the thesis for the first time, through a retro and prospective cohort study, has demonstrated that the hemostatic resuscitation protocols derived from military and civilian trauma for the correction of coagulopathy with a blood product ratio of one unit of packed red blood cell to one unit of fresh frozen plasma to one pool o
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6

McGregor, Brian. "The left ventricle, aortic valve, and arterial tree - a fresh engineering perspective." Thesis, University of Ulster, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.339346.

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7

Camacho, Fernando Graduate School of Biomedical Engineering Faculty of Engineering UNSW. "Statistical analysis of central aortic blood pressure parameters derived from the peripheral pulse." Awarded by:University of New South Wales. Graduate School of Biomedical Engineering, 2006. http://handle.unsw.edu.au/1959.4/26215.

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With the rise in prevalence of cardiovascular (CV) disease, risk stratification is becoming increasingly important. Accurate characterization of the CV system is required, for which central aortic blood pressure (BP) parameters form an integral part. However, invasive measurement of central aortic BP parameters (aP) is difficult. Therefore, non-invasive methods to estimate aP from the radial pressure pulse (rPulse) have been proposed. To analyze accuracy of estimated aP (aPhat) and applicability in risk stratification and diagnosis, this study presents: (1) a novel representation of the rPuls
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8

Cheng, Zhuo. "Analysis of blood flow in patient-specific models of type B aortic dissection." Thesis, Imperial College London, 2012. http://hdl.handle.net/10044/1/9178.

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Aortic dissection is the most common acute catastrophic event affecting the aorta. The majority of patients presenting with an uncomplicated type B dissection are treated medically, but 25% of these patients develop subsequent dilatation and aortic aneurysm formation. The reasons behind the long‐term outcomes of type B aortic dissection are poorly understood. As haemodynamic factors have been involved in the development and progression of a variety of cardiovascular diseases, the flow phenomena and environment in patient‐specific models of type B aortic dissection have been studied in this the
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9

Wolowczyk, Leszek. "Acute normovolaemic haemodilution in abdominal aortic aneurysm repair : the effect on systemic inflammatory response and clinical outcome." Thesis, University of Bristol, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.271910.

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10

Kumar, Hemant, University of Western Sydney, and of Science Technology and Environment College. "Software analytical tool for assessing cardiac blood flow parameters." THESIS_FSTA_XXX_Kumar_H.xml, 2001. http://handle.uws.edu.au:8081/1959.7/392.

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Introduction of Doppler ultrasound techniques into the Intensive Care setting has revolutionised the way haemodynamic status is monitored in the critically ill. However, in order to increase the usefulness of these techniques, the Doppler signal and its spectrum need to be further analysed in ways to facilitate a better clinical response. Extensive processing of the Doppler spectrum on Diagnostic ultrasound machines is limited by the real time performance considerations. It was therefore proposed that the spectral information from these systems be extracted off-line and full set of analytical
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11

da, Cunha Daise Nunes Queiroz. "Properties of flow through the ascending aorta in boxer dogs with mild aortic stenosis momentum, energy, Reynolds number, Womersley's, unsteadiness parameter, vortex shedding, and transfer function of oscillations from aorta to thoracic wall /." Columbus, Ohio : Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1243910694.

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12

TORRES, DIEGO FERNANDO CELIS. "NUMERICAL STUDY OF THE INFLUENCE OF TILT VALVE ANGLE ON BLOOD FLOW IN AN AORTIC MODEL." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2017. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=32320@1.

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PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO<br>COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR<br>PROGRAMA DE EXCELENCIA ACADEMICA<br>A substituição de válvula aórtica por cateter (Transcatheter Aortic Valve Replacement, TAVR) tornou-se uma poderosa alternativa para pacientes com estenose aórtica e com alto risco de serem submetidos à cirurgia tradicional de peito aberto. O conhecimento da distribuição da pressão, bem como a tensão cisalhante na superfície da aorta podem ajudar a identificar regiões críticas, onde o processo de remodelamento da aorta pode ocorrer. O objetiv
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13

Hazer, Dilana [Verfasser]. "Automated Patient-Specific Modeling of Blood Flow and Vessel Wall Mechanics in Aortic Pathology / Dilana Hazer." München : Verlag Dr. Hut, 2010. http://d-nb.info/100948530X/34.

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14

Burbridge, Michael Frank. "The rat aortic ring model of angiogenesis in vitro as an assay for angiogenic modulators, the role of the matrix metalloproteinases in vessel formation." Thesis, University of Liverpool, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.367795.

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15

Li, Longchuan. "Numerical and experimental study of three imaging advancements in phase contrast magnetic resonance imaging." Birmingham, Ala. : University of Alabama at Birmingham, 2007. http://www.mhsl.uab.edu/dt/2007p/li.pdf.

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16

Lacroix-Desmazes, Sebastien. "Influence of flow environment on the production and secretion of metalloproteinases and urokinase-type plasminogen activator by cultured bovine aortic endothelial cells." Thesis, Georgia Institute of Technology, 1993. http://hdl.handle.net/1853/15826.

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17

Celestin, Carey Jr. "Computational Fluid Dynamics Applied to the Analysis of Blood Flow Through Central Aortic to Pulmonary Artery Shunts." ScholarWorks@UNO, 2015. http://scholarworks.uno.edu/td/1972.

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This research utilizes CFD to analyze blood flow through pathways representative of central shunts, commonly used as part of the Fontan procedure to treat cyanotic heart disease. In the first part of this research, a parametric study of steady, Newtonian blood flow through parabolic pathways was performed to demonstrate the effect that flow pathway curvature has on wall shear stress distribution and flow energy losses. In the second part, blood flow through two shunts obtained via biplane angiograms is simulated. Pressure boundary conditions were obtained via catheterization. Results showe
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18

Morris, Ray William. "Changes in CW-Doppler aortic blood flow responses with passive tilting in normo- and borderline hypertensive men." Thesis, Virginia Tech, 1989. http://hdl.handle.net/10919/44126.

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Continuous-wave (CW) Doppler echocardiographic responses to passive tilting were measured in 39 men using the following protocol: standing; supine; +20° head-up; supine; â 20° head-down. Twenty of the subjects were normotensive (NTN) and the rest were borderline hypertensive (B-HTN) according to prior medical diagnosis. Doppler recordings of blood flow for aortic peak velocity (Pkv), peak acceleration (PkA), and stroke velocity integral (SVI) were taken after 15 minutes in each posture. A skilled technician, using the measurement procedures recommended by the instrument manufacturer, positi
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19

Mercer, Kevin Graham. "Surgery for abdominal aortic aneurysm : the systemic inflammatory response and the relationship of blood transfusion to inflammatory complications." Thesis, University of Leeds, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.403029.

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20

Staughton, Tracey Jane. "Transport properties of the rabbit aortic wall near branches : possible influences of nitric oxide synthesis and blood flow." Thesis, University of Reading, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.326753.

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21

Grytsan, Andrii. "Abdominal aortic aneurysm inception and evolution - A computational model." Doctoral thesis, KTH, Biomekanik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-197289.

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Abdominal aortic aneurysm (AAA) is characterized by a bulge in the abdominal aorta. AAA development is mostly asymptomatic, but such a bulge may suddenly rupture, which is associated with a high mortality rate. Unfortunately, there is no medication that can prevent AAA from expanding or rupturing. Therefore, patients with detected AAA are monitored until treatment indication, such as maximum AAA diameter of 55 mm or expansion rate of 1 cm/year. Models of AAA development may help to understand the disease progression and to inform decision-making on a patient-specific basis. AAA growth and remo
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22

Kekatpure, Avantika. "Gender differences in aortic endothelial function in a rat model of streptozotocin-induced diabetes : possible role of superoxide and cyclooxygenase." Scholarly Commons, 2009. https://scholarlycommons.pacific.edu/uop_etds/737.

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Objectives: To date little is known of the interaction between diabetes and sex hormones in the vasculature. A number of studies suggest that premenopausal diabetic women loose their gender based cardiovascular protection. However, there is insufficient evidence to explain the mechanism underlying the loss of this gender based cardioprotection in premenopausal diabetic women. The objectives of this study were to investigate whether there is a gender difference in the aortic endothelial function in · streptozotocin (STZ, 58 mg/kg, iv)-induced diabetic rats, and the potential role of superoxide
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23

Schurtz-Bouissou, Camille. "Relations entre la variabilité tensionnelle et la rigidité des gros troncs artériels chez le rat : Etudes dans trois modèles expérimentaux." Thesis, Paris Est, 2014. http://www.theses.fr/2014PEST0070.

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La rigidité artérielle ayant une valeur prédictive forte et indépendante d'évènements cardiovasculaires, nous émettons l'hypothèse que l'accumulation de variations de contraintes hémodynamiques altère la fonction et la structure des gros troncs artériels, indépendamment du niveau de pression artérielle. Nous avons donc mesuré l'impact de la variabilité tensionnelle sur la rigidité et la structure artérielles dans différents modèles de variabilité tensionnelle chez le rat.Chez le rat barodénervé et le rat sympathectomisé par la guanéthidine, 2 modèles de variabilité tensionnelle à court terme,
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24

Wetherill, Lindsay D. "Reproducibility of a continuous-wave Doppler ultrasound system for assessment of ascending aortic blood flow responses during graded exercise testing with healthy individuals." Thesis, Virginia Polytechnic Institute and State University, 1987. http://hdl.handle.net/10919/80102.

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Continuous-wave (CW) Doppler recordings of ascending aortic maximal blood flow acceleration (PkA), maximal velocity (PkV) and systolic velocity integral (SVI) were taken at each stage of a graded exercise treadmill test on two separate days with 30 physically active adult males. Signals were measured (Quinton Exerdop) for all cardiac cycles in the 3rd minute of each stage using a hand-held probe positioned at the suprasternal notch. A dedicated microcomputer, programmed to select "valid" beats on the basis of value consistency in the sample set, determined the acceptability of signals. No sign
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25

Wilson, Timothy Dale. "The effects of prior heavy intensity exercise on oxygen uptake kinetics and aortic mean blood velocity during moderate intensity exercise in older adults." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape9/PQDD_0004/MQ42225.pdf.

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26

Nevala, T. (Terhi). "Endovascular treatment of an abdominal aortic aneurysm:mid-term results and management of a type II endoleak." Doctoral thesis, University of Oulu, 2010. http://urn.fi/urn:isbn:9789514261343.

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Abstract Endovascular aneurysm repair (EVAR) is a minimally invasive alternative to open surgery to exclude an abdominal aortic aneurysm from the circulation to avert a rupture. The aim of this thesis was to evaluate the early and mid-term results of EVAR using the Zenith® stent-graft (Cook Inc, Bloomington, IN, USA) in asymptomatic and symptomatic abdominal aortic aneurysm (AAA) patients in three Finnish university hospitals. Furthermore, the aim was to study whether preoperative embolization of the inferior mesenteric artery (IMA) before EVAR decreases the incidence of a type II endoleak or
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27

Kumar, Hemant. "Software analytical tool for assessing cardiac blood flow parameters." Thesis, View thesis, 2001. http://handle.uws.edu.au:8081/1959.7/392.

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Introduction of Doppler ultrasound techniques into the Intensive Care setting has revolutionised the way haemodynamic status is monitored in the critically ill. However, in order to increase the usefulness of these techniques, the Doppler signal and its spectrum need to be further analysed in ways to facilitate a better clinical response. Extensive processing of the Doppler spectrum on Diagnostic ultrasound machines is limited by the real time performance considerations. It was therefore proposed that the spectral information from these systems be extracted off-line and full set of analytical
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28

Brandi, Antonio Carlos. "Tratamento endovascular de pacientes com doenças da aorta torácica: avaliação de resultados em longo prazo." Faculdade de Medicina de São José do Rio Preto, 2015. http://hdl.handle.net/tede/365.

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Submitted by Fabíola Silva (fabiola.silva@famerp.br) on 2017-05-25T19:30:55Z No. of bitstreams: 1 antoniocarlosbrandi_tese.pdf: 1540715 bytes, checksum: 85572fb595b07fb61d81ed453db08401 (MD5)<br>Made available in DSpace on 2017-05-25T19:30:55Z (GMT). No. of bitstreams: 1 antoniocarlosbrandi_tese.pdf: 1540715 bytes, checksum: 85572fb595b07fb61d81ed453db08401 (MD5) Previous issue date: 2015-05-20<br>Introduction: Thoracic aortic diseases, including dissections, aneurysms, pseudoaneurysms among other, are serious conditions that bring serious risks of morbidity and mortality. Its incidence is
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29

Pfluecke, C., M. Christoph, S. Kolschmann, D. Tarnowski, M. Forkmann, S. Jellinghaus, D. M. Poitz, et al. "Intra-aortic balloon pump (IABP) counterpulsation improves cerebral perfusion in patients with decreased left ventricular function." Sage, 2014. https://tud.qucosa.de/id/qucosa%3A35364.

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Background: The current goal of treatment after acute ischemic stroke is the increase of cerebral blood flow (CBF) in ischemic brain tissue. Intra-aortic balloon pump (IABP) counterpulsation in the setting of cardiogenic shock is able to reduce left ventricular afterload and increase coronary blood flow. The effects of an IABP on CBF have not been sufficiently examined. We hypothesize that the use of an IABP especially enhances cerebral blood flow in patients with pre-existing heart failure. Methods: In this pilot study, 36 subjects were examined to investigate the effect of an IABP on middle
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30

Spühler, Jeannette Hiromi. "Patient-Specific Finite Element Modeling of the Blood Flow in the Left Ventricle of a Human Heart." Doctoral thesis, KTH, Beräkningsvetenskap och beräkningsteknik (CST), 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-215277.

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Heart disease is the leading cause of death in the world. Therefore, numerous studies are undertaken to identify indicators which can be applied to discover cardiac dysfunctions at an early age. Among others, the fluid dynamics of the blood flow (hemodymanics) is considered to contain relevant information related to abnormal performance of the heart.This thesis presents a robust framework for numerical simulation of the fluid dynamics of the blood flow in the left ventricle of a human heart and the fluid-structure interaction of the blood and the aortic leaflets.We first describe a patient-spe
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31

Sigüenza, Julien. "Fluid-structure interaction problems involving deformable membranes : application to blood flows at macroscopic and microscopic scales." Thesis, Montpellier, 2016. http://www.theses.fr/2016MONTT301/document.

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Cette thèse traite plusieurs aspects scientifiques inhérents à la simulation numérique de problèmes d'interaction fluide-structure impliquant de fines membranes déformables. Deux cas spécifiques relatifs à la biomécanique cardiovasculaire sont considérés : l'interaction de l'écoulement sanguin avec la valve aortique (qui se produit à l'échelle macroscopique), et l'interaction de la membrane des globules rouges avec ses fluides interne et externe (qui se produit à l'échelle microscopique). Dans les deux cas, le couplage fluide-structure est géré par l'intermédiaire d'un formalisme de frontières
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32

Nozari, Ala. "Experimental cardiopulmonary cerebral resuscitation : A study of cerebral perfusion with special reference to the postresuscitation disturbances." Doctoral thesis, Uppsala University, Department of Surgical Sciences, 2000. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-459.

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<p>Ischemic neuronal injury continues to be a major delimiting factor in achieving successful clinical outcomesafter resuscitation from cardiac arrest. In this thesis, a pig model of cardiopulmonary resuscitation (CPR) wasused to address the effects of different interventions on cerebral blood flow and oxygenation during CPR and theinitial postresuscitation period. A novel technique is presented to quantify the reperfusion oxidative injury.</p><p>Maximization of cerebral blood flow during CPR by open-chest cardiac compression, continuous aortic balloon occlusion, and intra-aortic administratio
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33

Kumar, Vivek Ashok. "Design and evaluation of scaffolds for arterial grafts using extracellular matrix based materials." Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/45869.

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For small diameter (<6 mm) blood vessel replacements, lack of collaterals and vascular disease preclude homografts; while synthetic analogs, ePTFE, expanded polytetrafluoroethylene, and PET, polyethyleneterephathalate, are prone to acute thrombosis and restenosis. It is postulated that the hierarchical assembly of cell populated matrices fabricated from protein analogs provides a new design strategy for generating a structurally viable tissue engineered vascular graft. To this end, synthetic elastin and collagen fiber analogs offer a novel strategy for creating tissue engineered vascular graft
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34

Castro, Roberto Chaves. ""Circulação periférica em pacientes com insuficiência aórtica crônica e indicação de troca valvar"." Universidade de São Paulo, 2005. http://www.teses.usp.br/teses/disponiveis/5/5131/tde-05092005-115223/.

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Introdução: O recente aperfeiçoamento da ultra-sonografia permitiu a análise estrutural e funcional do vaso. Casuística e Métodos: 36 pacientes com insuficiência aórtica e indicação de troca valvar, divididos em grupos com pressão arterial diastólica (PAD) superior e inferior a 50mmHg, avaliados antes e seis meses após a cirurgia. A função arterial compreendeu a complacência, distensibilidade e a função endotelial pela dilatação fluxo-mediada e nitrato-mediada. Conclusão: A complacência e a distensibilidade foram maiores no grupo com menor PAD e diminuíram após a cirurgia. A disfunção endoteli
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35

Junior, Antonio Aurelio de Paiva Fagundes. "Estudo do fluxo sanguíneo regional e dos marcadores de perfusão tecidual em pacientes com insuficiência cardíaca em uso de balão intra-aórtico." Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/5/5131/tde-10122013-102948/.

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INTRODUÇÃO: O balão intra-aórtico (BIA) representa o mecanismo de assistência ventricular mais frequentemente utilizado em pacientes com insuficiência cardíaca (IC), no Brasil. OBJETIVO: Neste trabalho, avaliamos a ação do BIA sobre o fluxo sanguíneo carotídeo e braquial, além do seu efeito sobre os marcadores de perfusão tecidual e sobre o peptídeo natriurético cerebral (BNP). MÉTODOS: Entre julho de 2006 e maio de 2009, 33 pacientes foram avaliados, sendo 10 excluídos. Os pacientes foram inicialmente mantidos com o BIA em modo 1:1, com insuflação máxima, para a fase inicial do estudo (condiç
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36

Heitkemper, Megan. "The Development of Computational Methods and Device Design Considerations Towards Improving Transcatheter Heart Valve Engineering." The Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu1595406932637358.

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37

Goudot, Guillaume. "Applications innovantes des ultrasons en pathologie vasculaire : utilisation de l'imagerie ultrarapide dans l'analyse de la rigidité artérielle et des ultrasons pulsés en thérapie Arterial stiffening assessed by ultrafast ultrasound imaging gives new insight into arterial phenotype of vascular Ehlers–Danlos mouse models Aortic wall elastic properties in case of bicuspid aortic valve Segmental aortic stiffness in bicuspid aortic valve patients compared to first-degree relatives Wall shear stress measurement by ultrafast vector flow imaging for atherosclerotic carotid stenosis Pulsed cavitational therapy using high-frequency ultrasound for the treatment of deep vein thrombosis in an in vitro model of human blood clot." Thesis, Sorbonne Paris Cité, 2018. https://wo.app.u-paris.fr/cgi-bin/WebObjects/TheseWeb.woa/wa/show?t=2215&f=13951.

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38

Hernández, Enríquez Marco. "Transcatheter Aortic Valve Implantation: Moving Forward to Minimize Vascular and Bleeding Complications = Implante Transcatéter de Válvula Aórtica: Avanzando hacia la Reducción de Complicaciones Vasculares y Hemorrágicas." Doctoral thesis, Universitat de Barcelona, 2020. http://hdl.handle.net/10803/669896.

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INTRODUCTION: TAVI has settled as the standard of care of AS for inoperable, high-risk, and selected intermediate-risk patients undergoing aortic valve replacement. Vascular and bleeding complications are related to worst outcomes. HYPOTHESES: a. The reduction and early recognition of vascular and bleeding complications might improve clinical outcomes in patients treated with TAVI. b. A full percutaneous transfemoral approach for TAVI is related to a lower rate of major bleedings in comparison to the surgical cut-down approach. c. The development of post-TAVI thrombocytopenia has a pr
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39

Menut, Marine. "Chirurgie endovasculaire virtuelle pour patient-spécifique : Application au traitement de l'anévrisme de l'aorte thoracique." Thesis, Lyon, 2017. http://www.theses.fr/2017LYSEI047/document.

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Les maladies cardiovasculaires sont la première cause de mortalité dans le monde chez les personnes âgées de plus de 65 ans. Parmi les maladies artérielles, l'anévrisme, maladie asymptomatique, est une dilatation localisée et permanente de la paroi d'une artère aboutissant à la formation d'une poche de taille variable. Soumis aux impulsions sanguines, l'anévrisme augmente progressivement et lorsqu'il se rompt, provoque une hémorragie interne pouvant entraîner la mort. Ce projet de recherche concerne le traitement endovasculaire des Anévrismes de l'Aorte Thoracique dont le traitement consiste à
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40

Freercks, Robert Jeremy. "The impact of vascular calcification on ambulatory and central aortic blood pressure in a South African dwelling dialysis population : a clinical, radiological and pathophysiological study of vascular health in a young prevalent dialysis population in a developing country." Master's thesis, University of Cape Town, 2011. http://hdl.handle.net/11427/11995.

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Includes abstract.<br>Includes bibliographical references.<br>In Sub-Saharan Africa, the prevalence of vascular calcification (VC) in CKD-5D is unknown. We undertook to determine the effect of ethnicity on VC, the risk factors for VC, the utility of abdominal X-ray (AXR) in predicting coronary calcium score (CCS) and the effect of VC on central aortic systolic pressure (CASP) and left ventricular mass index (LVMI) in South African dialysis patients. ... Black race significantly protects from VC in South African CKD-5D patients and warrants further study. The AXR is a useful screening tool for
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41

Orra, Hussein Amin. ""Estudo experimental da transmissão da pulsatilidade da endoprótese à parede do aneurisma da aorta após correção endoluminal"." Universidade de São Paulo, 2005. http://www.teses.usp.br/teses/disponiveis/5/5132/tde-21122005-140229/.

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Objetivo: Medir a pulsatilidade da parede do aneurisma de aorta humano antes e depois de sua correção endoluminal. Método: Cinco aneurismas foram submetidos à perfusão pulsátil antes e depois do implante de uma endoprótese. Resultado: o nível da coluna de água oscilou durante a pulsação com variações de 17, 16, 13, 7 e 25 cm antes da colocação da endoprótese. Depois da prótese, a oscilação diminuiu em todos os casos para 13, 12, 9, 3,5 e 23 cm, respectivamente. Conclusão: A pulsação da endoprótese é transmitida à parede do aneurisma<br>Objective: To measure the pulsatility of human aortic aneu
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42

Moscarelli, Marco. "A multi-centre randomized controlled trial investigating the effect of remote ischaemic preconditioning (RIPC) on blood and myocardial biomarkers of stress and injury-related signalling in patients having isolated coronary artery bypass grafting (CABG) or aortic valve replacement (AVR) using cardiopulmonary bypass (CPB)." Thesis, Imperial College London, 2018. http://hdl.handle.net/10044/1/61481.

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Objective: To compare markers of cardiac injury, inflammatory and oxidative responses, and myocardial cellular changes in the left and right ventricles of patients undergoing isolated coronary artery bypass grafting (CABG) or aortic valve replacement (AVR) using cardiopulmonary bypass (CPB) and cardioplegic arrest with or without remote ischaemic preconditioning (RIPC). Methods: Two conditions were studied for each surgical stratum (CABG or AVR): (a) no RIPC and (b) RIPC following anaesthesia and before sternotomy. The control group (no RIPC) represented standard clinical practice. Left and ri
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43

Simon, Helene Anne. "Numerical simulations of the micro flow field in the hinge region of bileaflet mechanical heart valves." Diss., Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/34861.

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Native heart valves with limited functionality are commonly replaced by a bileaflet mechanical heart valve (BMHV). However, despite their widespread use, BMHVs still cause major complications, including hemolysis, platelet activation, and thromboembolic events. These complications are believed to be due to the non-physiologic hemodynamic stresses imposed on blood elements by the hinge flows. Three-dimensional characterization of the hinge flows is therefore crucial to ultimately design BMHVs with lower complication rates. This study aims at simulating the pulsatile 3D hinge flows of various BM
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44

Amaral, Nathalia Oda. "Envolvimento do núcleo pré-óptico mediano (MnPO) na recuperação cardiovascular induzida pela infusão de salina hipertônica em animais submetidos ao choque hemorrágico." Universidade Federal de Goiás, 2014. http://repositorio.bc.ufg.br/tede/handle/tede/4502.

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Submitted by Luciana Ferreira (lucgeral@gmail.com) on 2015-05-11T13:12:44Z No. of bitstreams: 2 Dissertação - Nathalia Oda Amaral - 2014.pdf: 1540433 bytes, checksum: cd3e674df4e9e84f991223a293b3d3c2 (MD5) license_rdf: 23148 bytes, checksum: 9da0b6dfac957114c6a7714714b86306 (MD5)<br>Approved for entry into archive by Luciana Ferreira (lucgeral@gmail.com) on 2015-05-11T13:31:56Z (GMT) No. of bitstreams: 2 Dissertação - Nathalia Oda Amaral - 2014.pdf: 1540433 bytes, checksum: cd3e674df4e9e84f991223a293b3d3c2 (MD5) license_rdf: 23148 bytes, checksum: 9da0b6dfac957114c6a7714714b86306 (MD5)<br>Made
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45

Guimond, Stephen. "Computational fluid dynamics investigation of the orientation of a pediatric left ventricle assist device cannula to reduce stroke events." Honors in the Major Thesis, University of Central Florida, 2012. http://digital.library.ucf.edu/cdm/ref/collection/ETH/id/561.

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Ventricle Assist Devices (VADs), which are typically either axial or centrifugal flow pumps implanted on the aortic arch, have been used to support patients who are awaiting cardiac transplantation. Success of the apparatus in the short term has led to long term use. Despite anticoagulation measures, blood clots (thrombi) have been known to form in the device itself or inside of the heart. The Ventricle Assist Devices supply blood flow via a conduit (cannula) implanted on the ascending aorta. Currently, the implantation angle of the VAD cannula is not taken into consideration. Since the VADs s
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46

Ribeiro, Juliana Caldas. "Avaliação da hemodinâmica encefálica em pacientes de alto risco submetidos a cirurgia cardíaca: papel do balão de contrapulsação intra-aórtico." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/5/5131/tde-06042017-085222/.

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Introdução: A cirurgia cardíaca resulta em taxa considerável de complicações neurológicas, incluindo delirium, disfunção cognitiva e acidente vascular cerebral isquêmico. Supõe que a fisiopatologia envolva embolia, aterotrombose, hipofluxo, redução do débito cardíaco e alterações da autorregulação cerebral. O balão de contrapulsação intra-aórtico (BIA) é um dispositivo de assistência circulatória comumente utilizado no perioperatório de pacientes de alto risco com o objetivo de otimização do débito cardíaco e da perfusão coronária. Apesar do benefício hemodinâmico do BIA, não é conhecido seu e
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47

Eazzetta, Benedict A. "Flow visualization of the human abdominal aorta." Thesis, Georgia Institute of Technology, 1987. http://hdl.handle.net/1853/17800.

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48

La, Civita Giorgio. "Studio numerico di flussi non Newtoniani in un arco aortico." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018.

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Si è studiata una procedura completamente open source per lo studio CFD del flusso sanguigno a partire da dati TAC, considerando il comportamento non newtoniano del sangue. La prima parte del progetto si è incentrata sulla validazione del codice implementato in Open-FOAM per la modellazione della reologia non Newtoniana secondo la legge di Casson, modello scelto per le proprietà del sangue. Si è riusciti con successo a validare il codice per diversi regimi di moto che vanno dal laminare al turbolento (col modello k-omega SST), ottenendo un buon accordo con le misurazioni sperimentali utilizza
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49

Sénejoux, François. "Etudes phytochimique et pharmacologique de Ziziphora clinopodioides (Lamiaceae), Nitraria sibirica (Nitrariaceae) et Echinops integrifolius (Asteraceae), plantes anti-hypertensives de la Pharmacopée ouïghoure." Thesis, Besançon, 2011. http://www.theses.fr/2011BESA3009/document.

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Affectant près d'un milliard de personnes dans le monde, l'hypertension artérielle représente un facteur de risque majeur de pathologies cardiovasculaires et d'insuffisance rénale et constitue l'une des principales causes de mortalité. L'identification de traitements anti-hypertenseurs efficaces et tenant compte des particularités des différentes populations du globe présente ainsi un intérêt capital en termes de santé publique. Notre travail a été consacré à l'étude de plantes anti-hypertensives de la Pharmacopée ouïghoure, principale ethnie de la Région autonome du Xinjiang, vaste territoire
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50

Moore, James E. Jr. "Steady and pulsatile flow visualization in the human abdominal aorta." Thesis, Georgia Institute of Technology, 1988. http://hdl.handle.net/1853/16351.

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