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 257 for “"Ventricle"”.
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Left Ventricle Assist Device
… 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 LVADs …
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Mechanisms of brain ventricle development
The brain ventricles are a conserved system of fluid-filled cavities within the brain that form during the earliest stages of brain development. Abnormal brain ventricle development has been correlated with neurodevelopmental disorders including hydrocephalus and schizophrenia. The mechanisms which …
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Dispersive Characteristics of Left Ventricle Filling Waves
… 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 filling can be non-invasively imaged using color …
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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
… 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 models …
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Magnetic resonance imaging of the right ventricle in human pulmonary hypertension
… non-invasive, direct and accurate study of both ventricles; at rest and during stress. In Chapter 3, CMR imaging was used to identify an NT-proBNP threshold (1685 ng/l, sensitivity 100%, specificity 94%) for the non-invasive detection of RV systolic dysfunction in patients with PH. In Chapter 4, …
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Staged surgical palliation and ventricular performance in functionally single ventricle anatomy
… function in children with functionally single ventricle anatomy. Ventricular volume and pressure were measured using a combined pressure-conductance catheter. Initial laboratory-based experiments were performed using a physical model of the left ventricle, which allowed examination of the …
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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 cineangiogram …
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Material parameter identification for modelling the left ventricle in the healthy state
… 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 ventricle in …
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The intraorgan lymphatic system of the rat left ventricle in normalcy and aging
… 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 in …
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Design of Percutaneous Dual Propeller Pump to assist Patients with Single Functional Ventricle
… by the existence of a single functional ventricle, which perfuses both the systemic and pulmonary circulation in parallel. A three-stage palliation procedure, including the final Fontan Completion, is often adopted by surgeons to treat patients with such CHDs. However, the most common …
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Analysis of a membrane type blood oxygenator and a ventricle type blood pump
… of the Arp Hembrane Type Blood Oxygenator and a ventricle type blood pump. The system is designed for newborns suffering from Respiratory Distress Syndrome (R.D.S.), especially the 15% who are unable to be helped by the Arp Infant Respirator. The analysis included oxygen transfer studies and …
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The Angiotensin Receptor (AT₁) Inhibitor, Losartan, Slows Post-Natal Thickening of the Left Ventricle
… 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) in a …
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