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 12 of 12 for “"Ventricular pressure"”.
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Angiogenesis and Myogenesis in a Chronic Ischemic Heart.
… 4, Ischemia + Cells. Sonomicrometry and Millar pressure transducers were used to determine contractility, left ventricular pressure, and pressure-volume loops. There were no significant differences (p<0.05)among the hemodynamic data except for Group 4, which produced significantly lower output …
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An Evaluation of the Thermodilution Method for Measuring Ventricular Volumes.
… some measure of fiber length. The volume of the ventricular cavity is a function of this fiber length and thus can provide such a measure. For this reason many investigators have directed their research toward developing or improving methods for making ventricular volume measurements. The methods …
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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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Muscle Metaboreflex Control Of Coronary Blood Flow And Ventricular Contractility During Dynamic Exercise In Normal And Heart Failure Conditions
… demand via a significant increase in heart rate, ventricular contractility and afterload. This increase in cardiac work should cause coronary metabolic vasodilation. However, little if any coronary vasodilation is observed due to concomitant sympathetically induced coronary vasoconstriction. In …
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Coronary flow mechanics: an anatomically based mathematical model of coronary blood flow coupled to cardiac contraction
Coronary blood flow through the ventricular contraction cycle has been investigated in this thesis using an anatomically accurate computational model. Using Strahler ordered morphological data and an avoidance algorithm a three dimensional finite element model has been constructed of the largest …
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Interactions between potassium channels and serotonin in pulmonary arterial hypertension
… results from increases in mean pulmonary artery pressure and pulmonary vascular resistance. If untreated it leads to right ventricular failure and death. 5-Hydroxytryptamine (5-HT) has been implicated in the disease process and is thought to promote both vasoconstriction and remodelling of the …
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Investigation of the intracellular pathways required for 5HT-induced mitogenesis and their role in pulmonary hypertension.
… resistance and elevated pulmonary artery pressure, leading to right ventricular failure and eventually death. The monoamine 5-hydroxytryptamine (5HT) has been implicated in the processes of pulmonary vasoconstriction and pulmonary artery remodelling that contribute to the development of …
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Acoustic Radiation Force Impulse Imaging of Myocardial Performance
… were formed of <italic>canine</italic> left ventricular free walls while the hearts were externally paced by one of two electrodes positioned epicardially on either side of the imaging plane. Directions and speeds of myocardial stiffness propagation were measured within the ARFI imaging field …
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The pharmacological modification of reperfusion injury with particular reference to calcium fluxes in the isolated rat heart
… aortic output, coronary flow and left ventricular pressure. The incidence of reperfusion ventricular arrhythmias was measured by the incidence of ventricular tachycardia and/ or fibrillation. In selected studies, the metabolic status of hearts was evaluated using biochemical assays …
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Parameters and algorithms to evaluate cardiac mechanics by conductance catheter
… particular, we present the phenomenon known as ventricular mechanical dyssynchrony: its impact on cardiac function, the therapy for its treatment and the methods for its quantification. Specifically, we describe the conductance catheter and its use for the measurement of dyssynchrony. At the end …
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Assessment of Cardiac Function by Acoustic Radiation Force (ARF) Based Methods of Ultrasound Elastography
… systolic and diastolic function, is the pressure-volume (PV) loop measurement; however, this measurement is not typically used clinically due to the invasiveness of the technique. PV loop measurement requires the introduction of a pressure or pressure-volume catheter into the left …