Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 10 of 10 for “"Windkessel"”.
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Mathematical Model for Hemodynamic and Intracranial Windkessel Mechanism
… system and abnormalities of intracranial Windkessel mechanism. Windkessel mechanism is normally observed in major arterial system as well as intracranial space which is the absorbing function of artery provided by its elastic properties and peripheral resistance. The effectiveness of …
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Continuous estimation of cardiac output and arterial resistance from arterial blood pressure using a third-order Windkessel model
… the use of a third-order variation of the Windkessel model, which is referred to as the modified Windkessel model. We validate its ability to generate well-behaved proximal and distal pressure waveforms for a given flow waveform and thus characterize the arterial tree. We also develop a …
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Design and implementation of an apparatus for hydrodynamic and fatigue testing of prosthetic aortic valves
… the test apparatus was based on the four-element Windkessel model of the arterial system. This simple lumped parameter electrical analogy of the arterial system takes aortic and arterial resistance, arterial compliance, and blood inertance into account to simulate total arterial impedance. This …
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Material parameter identification for modelling the left ventricle in the healthy state
… system, was modelled with the three element Windkessel model of Westerhof. The model was calibrated to pressure-volume data, which was adaptedfrom the work of Kerckhoffs. The projected Levenberg-Marquardt algorithm was used to identify material parameters. Identification of the anisotropic …
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Estimation of cardiovascular indices by analysis of the arterial blood pressure signal
… physiology within the framework of a generalized Windkessel model, which is a widely accepted cardiovascular model. Algorithms to identify end systole were also developed and implemented in the new and existing SV, CO, and TPR estimation algorithms. The algorithms were validated by applying them …
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A patient-specific FSI model for vascular access in haemodialysis
… modelled as a Newtonian fluid. A three-element Windkessel model is used to allow the fluid to move through the outlets of the computational domain without causing non–physical reflections. Flow data acquired from MRI is used to prescribe the flow at the inlet. The parameters of the …
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A Computational Model of Aneurysmal Flow at the Abdominal Aorta
… to assign boundary conditions. A three element Windkessel model was coupled to the 3D geometry model of the disease in order to couple inlet flow with outlet pressure. This model resulted in more precise hemodynamic conditions for pulsatile flow: 1- in terms of realistic wall pressure values and …
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Steps Towards a Closed-Loop System for Blood Pressure Control
… We emphasize our use of the two-element Windkessel model in our pharmacodynamic component. We then build a model predictive control framework given this pharmacokinetic-pharmacodynamic model, and present preliminary control simulation results. Our simulation results indicate feasibility …
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Fluid-structure interaction modelling of a patient-specific arteriovenous access fistula
… applied at the artery inlet and a three-element Windkessel model at the artery and vein outlets. ANSYS® Mechanical™, a finite element method solver, is used to model the nonlinear behaviour of the vessel walls. The artery and vein walls are assumed to follow a third-order Yeoh model, and are …
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The cardiovascular profile of the low renin phenotype in a black South African population
… volume, total peripheral resistance (TPR) and Windkessel arterial compliance. Active plasma renin levels were determined at rest and when a stressor (CPT) was applied. Reactivity was calculated for each participant as the percentage change from the resting value. For the second objective, black …