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Showing 1 to 20 of 114 for “"vessel wall"”.
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Characteristics of blood vessel wall and atherosclerosis using high frequency ultrasound signals
… to characterize small tissue specimens such as vessel wall of a few mm thickness. We attempted characterization of normal and atherosclerotic tissue specimens using 50 MHz ultrasound. Techniques for measurement of ultrasound velocity, attenuation and backscatter parameters of signals were …
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Modulation of the reactivity of the vessel wall by local substances derived from the endothelium and perivascular nerves
Weefseldoorbloeding wordt geregeld door een complexe reeks mechanismen die, hoofdzakelijk door het regelen van de diameter van de bloedvaten, zorgen voor het behoud van de weefselhomeostase. Vasodilatatie speelt een belangrijke rol in de regeling van de doorbloeding van een bepaald vaatbed. Het …
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Selenium and Functional State of the Vessel Wall under Normo- and Hypertension - Experimental Research // Селен и функционално състояние на съдовата стена при нормо- и хипертензия - експериментални проучвания
Целта на дисертационния труд е да се проучат ефектите на различното селеново съдържание в храната върху оксидативния статус и неговото отражение върху липидния профил и състоянието на съдовата стена у нормотензивни Wistar-Kyoto (WKY) и спонтанно-хипертензивни плъхове (SHR). Експерименталните …
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Magnetic Resonance Imaging in Paediatric Coronary Vasculopathy
… to achieve this by imaging coronary lumen, vessel wall and central vascular stiffness in a child-friendly free-breathing protocol lasting thirty minutes. Methods A three-dimensional steady-state-free-precession [3D SSFP) imaging sequence for coronary artery lumen imaging was optimised for …
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Development of native and contrast enhanced magnetic resonance imaging for the characterization of cardiovascular disease
… MRI sequences to; identify plaque in the aortic vessel wall, to visualize areas of ventricular scar after myocardial infarction and pulmonary vein and atrial wall lesions after radiofrequency (RF) ablation for atrial fibrillation (AF). The double inversion recovery (DIR) sequence is traditionally …
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Comparative effect of haemodynamic variables and rheological properties of the blood on the margination and adhesion of leukocytes and platelets
… of free-flowing cells 'marginated' near the vessel wall and the force experienced by their initial adhesive bonds. Platelet adhesion was dependent on the velocity of the free-flowing cells near the vessel wall and the force experienced by the platelets once adhered. In contrast to leukocytes, …
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Three-dimensional Quantitative Magnetic Resonance Imaging of Carotid Atherosclerotic Plaque
… used to acquire objective biomarkers of carotid vessel wall and atherosclerotic plaque, with high accuracy and good repeatability. The research presented in this thesis describes the use of multiple quantitative MRI methods to evaluate the carotid vessel wall. These include dynamic …
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Ex-vivo 3D assessment of carotid stenosis with ultrasound
… structure and composition in the carotid vessel wall. It has been shown that the progression of the disease can be monitored by tracking changes in the carotid intima-media thickness (IMT). Non-invasive peripheral vascular ultrasound (U/S) of the carotid artery is a non-invasive, cost …
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Factors That Influence Monocyte Differentiation and Hematopoietic Stem Cell Recruitment In Atherogenesis
… by the infiltration of monocytes into the vessel wall, their differentiation into phagocytic resident macrophages, and subsequent lipid uptake and accumulation causing plaque growth and atheroma formation. Hyperlipidemia and other risk factors for cardiovascular disease promote the …
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An investigation of the fluorescence emitted by arterial intimas during irradiation by a XeCl excimer laser
… been limited by the unacceptably high rate of vessel wall perforation. To overcome this limitation, fluorescence spectroscopy of arterial wall tissue has been proposed as a technique to discriminate between normal and atherosclerotic arteries and thereby prevent arterial wall perforation during …
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Lyso-PC and macrophage interplay. Scavenging through the fatty side of atherosclerosis
… is triggered by LDL entrapment in the vessel wall. Oxidation and enzymatic processing of LDL give rise to inflammatory mediators such as lyso-PC. These inflammatory mediators attract monocytes into the vessel wall where they differentiate into macrophages. The macrophages adopt …
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Fluid-Structure Interaction of Large Viscoelastic Vessels Under Pulsatile Conditions
… investigation into the response of compliant vessels to pulsatile flow for the purposes of properly characterizing the vessel-wall material properties. The structural deformation of, and flow field within, the compliant vessel were recorded using ultrasound imaging. The ultrasound data were …
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Design of passive decay heat removal system for the lead cooled flexible conversion ratio fast reactor
… utilize passive cooling through the reactor vessel to atmospheric air. Enhancements such as axial fins, a perforated plate, and round indentations, or dimples, were considered as additions to the hot air riser to increase heat transfer. Other enhancements include a liquid metal bond between …
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Circulating proteoglycans and glycosaminoglycans during critical illness
… the carbohydrate rich inner layer of the blood vessels. Important components of the glycocalyx are the proteoglycans with their attached glycosaminoglycans. At this location these molecules contribute to the adhesion and transport of leucocytes to inflamed tissue, the anticoagulation as well as …
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Glucocorticoids and angiogenesis
Angiogenesis is the creation of new blood vessels from the existing vasculature that occurs through a complex series of interactions and is tightly regulated. Glucocorticoids are acknowledged to inhibit angiogenesis at high concentrations but whether endogenous glucocorticoid concentrations are …
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Estocagem por estratificação térmica de líquido em reservatório
… profile history of.the liquid and the vessel wall, during the normal operating conditions (charging, discharging and static node). The theoretical results are compared to the existing experimental data. Also, the influence of the height to diameter ratio (H/D) of the vessel on the …
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Development and Validation of Non-Invasive Methods for the Identification of Patient-Specific Hyperelastic and Anisotropic Material Properties of Abdominal Aortic Aneurysms In Vivo
… affecting the biomechanical properties of the vessel wall. These changes create heterogeneous deformations and vulnerable regions prone to rupture. Consequently, the diameter based criterion allows limited individual risk stratification, risking unnecessary surgeries or missed critical cases. …
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Inflammation and arterial stiffness
… structural and functional changes within the vessel wall. It is well known that increased large artery stiffness independently predicts the cardiovascular risk in a variety of populations. The identification of populations at higher risk of increased arterial stiffness and the knowledge of the …
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MRT-gesteuerte Ballonangioplastie peripherer Arterien zur lokalen Substanzapplikation in die Gefäßwand
… sequences. In order to treat arteriosclerotic vessel lumen stenoses and prevent restenoses after angioplasties local drug-delivery during intervention has been suggested. Within four examination modules a method for MR-guided percutaneous angioplastie and dilatation of vascular stenoses with …
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Analyse der funktionellen Bedeutung von Sequenzveränderungen ausgewählter Matrixmetalloproteinasen für die Pathogenese von Dissektionen hirnversorgender Arterien
… in the extracellular matrix (ECM) of affected vessel walls and the skin of patients. Matrix metalloproteinases (MMP) play a central role in the regulation of the ECM particularly in the regulation of the collagens. In the vessel wall of patients with CAD a lack of kollagen III was found but …
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