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 20 of 125 for “"left ventricle"”.
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Left Ventricle Assist Device
… loops in aiding the development and testing of left ventricle assist devices (LVADs). Heart disease is the leading cause of death in America, and LVAD offers an effective solution to patients with severe coronary artery disease who are not eligible for heart transplants. However, before testing …
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Dispersive Characteristics of Left Ventricle Filling Waves
Left ventricular diastolic dysfunction (LVDD) is any abnormality in the filling of the left ventricle (LV). Despite the prevalence of this disease, it remains difficult to diagnose, mainly due to inherent compensatory mechanisms and a limited physical understanding of the filling process. LV …
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MATRIX METALLOPROTEINASES AND LEFT VENTRICLE MASS AND FUNCTION
Introduction: Left Ventricle (LV) remodelling is critical pathophysiological process in the development of heart failure. Previous published studies have suggested the pivotal role of matrix metalloproteinases and NT- pro BNP in the pathogenesis of LV remodelling. Our objective was to establish a …
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An electrophysiologic investigation of the normal and ischemic left ventricle
… investigation of the normal and ischemic left ventricle is conducted using the chronic conscious pig as the experimental model. The experimental conditions imposed upon this preparation include mechanical occlusion of the left anterior descending coronary artery, cerebral stimulation and …
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Performance characteristics of the left ventricle during and following induced extrasystoles
<p>During the last two decades, since the heart has become a direct target for various surgical procedures for the correction of several abnormalities, interest in understanding its basic regulatory mechanisms and performance has increased considerably. Many experiments have been devised to study …
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Model-Based Shape and Motion Analysis: Left Ventricle of a Heart
… of the shape, motion, and deformation of the left ventricle of a heart (LV) is an important yet open research problem. Recently, computer vision techniques for reconstructing the 3-D shape and motion of the LV have been developed. The main drawback of these techniques, however, is that their …
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Development and Application of Low-Order Computational Models of the Left Ventricle
… work is to develop theoretical models for left ventricle (LV) dynamics that allow rapid estimation of myocardial stiffness and contractility from echocardiogram data. To reduce the computational complexity of this inverse problem, we represent LV deformation in terms of a limited number of …
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Left ventricle motion and shape modeling, analysis, and visualization from image sequences
… of modeling, analysis, and visualization of left ventricle motion and deformation based on two types of image sequences. The first type of image sequence used in this research is the coronary cineangiograms. The 3D coordinates of a set of bifurcation points obtained from the coronary …
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Material parameter identification for modelling the left ventricle in the healthy state
… model, was used to simulate a healthy canine left ventricle. Passive behaviour of the myocardium was modelled using the constitutive model of Usyk. In addition, active behaviour of the myocardium was modelled by the active stress law of Guccione. Furthermore, the load faced by the left …
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The intraorgan lymphatic system of the rat left ventricle in normalcy and aging
Intracardiac lymphatic vessels of the rat heart left ventricle were studied quantitatively at the ultrastructural level in order to establish baseline morphometric data and also to assess age-related variability in the accepted visible macromolecular transport pathways. Lymphatic vessels were found …
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The Angiotensin Receptor (AT₁) Inhibitor, Losartan, Slows Post-Natal Thickening of the Left Ventricle
… renin angiotensin system (RAS) in the mammalian left ventricle regulates growth of heart tissue in response to pressure-overload. Upon parturition, the mammalian left ventricle (LV) experiences pressure overload to which it responds by rapid growth, becoming thicker than the right ventricle (RV) …
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Effects of structure on flow mechanics in the human left ventricle and respiratory tract
… role of trabeculae on the biomechanics of the left ventricle. Similarly, large-scale airflow through the respiratory tract has not been fully investigated as a function of age or mechanical ventilation. This research has revealed some of the flow patterns caused by these different scale …
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Active contraction of the left ventricle with cardiac tissue modelled as a micromorphic medium
… model to investigate the behaviour of the left ventricular myocardium during a heartbeat. The simulated results presented here correspond well with typical ventricular mechanics observed in clinical experiments. This work demonstrates the potential of a micromorphic formulation for …
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The Distribution of Contractility Across The Wall of The Left Ventricle as Influenced by Coronary Hemodynamics
Made available in DSpace on 2014-12-11T22:22:13Z (GMT). No. of bitstreams: 1 7121254.pdf: 4261329 bytes, checksum: ebe10273c2feaeaf086fef47b994d794 (MD5) Previous issue date: 1971
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Effect of Long-Term Hypoxia on Myocardial Alpha1- Receptors
… during developmental process with both fetal left ventricle(LV) and fetal right ventricle(RV) having significantly more binding sites than respective adult ventricles. We also demonstrated that the positive inotropic response to the α<sub>1</sub>-adrenergic agonist phenylephrine did not differ …
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Hydrodynamics of Cardiac Diastole
Left ventricular diastole (filling) is a complex process with many features and coupled compensatory mechanisms which coordinate to maintain optimal filling and ejection of the left ventricle. Diastolic filling is controlled by the left ventricular recoil, relaxation, and compliance as well as …
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Image processing in echography and MRI
… speckle<br/>detection in 3D ultrasound, left ventricle detection in cardiac magnetic resonance imaging<br/>(MRI) and flow feature visualisation in velocity MRI.<br/><br/>For speckle detection, a learning from data approach was taken using pattern recognition<br/>principles and low-level …
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