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 105 for “"Ventricles"”.
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The postnatal development of the human cardiac ventricles
The name of William Harvey is imortal, and it is fitting that a quotation form his epoch-making 'De Motu Cordis et Sanguinis' should preface this thesis. the discoverer of the circulation did not fall to point out the difference between foetal and postnatal conditions of the heart and great …
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Numerical simulation of the flow in model skeletal muscle ventricles
Until recently, the only realistic form of treatment available to patients in end stage heart failure was transplantation. In the last few years, the possibility of diverting skeletal muscle from its normal function to perform a cardiac assist role has emerged as a potential alternative to …
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The influence of size and progression of Intra-cerebral Hematoma on the Lateral Ventricles
… of an ICH inside brain tissue is on the Lateral Ventricles(LV). When the hemorrhage occurs close enough to the lateral ventricles, filled with cerebrospinal fluid(CSF), it disrupts the balance of fluid in LV. A minor pressure change in LV can negatively influence the production of CSF as well as …
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An analysis of defibrillation and cardiac resynchronization therapy strategies in patients with failing systemic right ventricles
The expanding application of cardiac resynchronization (CRT) and implantable cardioverter-defibrillator therapy (lCD) to include patients with congenital heart disease requires careful evaluation of selection criteria and unconventional adaptive strategies to ensure clinical efficacy. A single …
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A morphometric study of the brain ventricles of patients diagnosed with Chronic Hydrocephalus at Groote Schuur Hospital
Hydrocephalus (HCP) is a cerebrospinal fluid condition of the central nervous system, which when it accumulates causes an increase in ventricular enlargement and raised intracranial pressure (ICP). Raised intracranial pressure in a fixed volume space is dangerous as it presses onto the brain …
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Postsynaptic Cholinergic Control Of Cardiac Function In Aging
… (1961) declined significantly in the atria and ventricles of the aged compared to adult rats. (ii) No age-related difference was seen in muscarinic receptor number in the atria and ventricles as assessed by {dollar}lbracksp3rm Hrbrack QNB{dollar} binding, but the muscarinic receptor binding …
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Myocardial Contractility in Fetal Sheep Exposed to Long-term Hypoxia at High Altitude : Activator Calcium and Beta-adrenergic Receptor Function
… were decreased by -35% in both left and right ventricles. Ryanodine (10"^ M) reduced maximum active tension (T<sub>max</sub>) to -25-40% of baseline values, indicating that the sarcoplasmic leticulum was the chief source of activator calcium. DHPR number did not change, but RyR density and the …
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Automatic segmentation of wall structures from cardiac images
… to data variations are explored to segment the ventricles from CT images and extract the left atrium from MR images. As applications, the segmentation results are used to facilitate cardiac disease analysis. Specifically, 1. An automatic method is proposed to extract the ventricles from CT …
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Magnetic resonance imaging studies of cardiac changes in diabetic and hypertensive rats
… and functional changes in the left and right ventricles following induction of diabetes in streptozotocin-treated rats. The effects of the angiotensin-converting enzyme inhibitor captopril upon such changes were also investigated. Finally, the MRI methods were also used to characterize the …
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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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Diplostomulum trituri (Trematoda: diplostomatidae) a larval strigeoid trematode in the brain and cranial case of the newt, Notophthalmus viridescens (Rafinesque)
… damage which includes increased size of the ventricles and loss of neural tissue. Neurophysiological symptoms of parasitism include sluggish behavior and poor reflexes. Black material was observed in the lumen of the intestinal ceca. Several mesocercariae were observed to be attached to the …
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Action of drugs on the central nervous system with special reference to acetyl choline
… the vagus and injection of acetyl choline in the ventricles of the brain have a similar effect on respiration, namely a marked depression of respiratory movements.
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Automated Measurement of Midline Shift in Brain CT Images and its Application in Computer-Aided Medical Decision Making
… actual midline is estimated from the deformed ventricles by shape matching method. The horizontal shift in the ventricles is then calculated based on the ideal midline and the actual midline in TBI CT images. The proposed method presents accurate detection of the ideal midline using anatomical …
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Regional Mechanical Properties and Microstructure of Ovine Heart Chambers
… and posterior portions of the left and right ventricles, atria, and appendages underwent biaxial mechanical testing. A Fung-type strain energy function was used to fit the experimental data. Tissue behavior was quantified based on the magnitude of strain energy, as an indicator of tissue …
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Entry-based Planning of Neurosurgical Trajectories
… to drain excess cerebrospinal fluid from the ventricles to relieve pressure. Most often, EVDs are inserted free-hand, without guidance, at a point on the skull named Kocher’s point, perpendicular to the skull surface. Previous freehand EVD insertion studies have reported insertions in ideal …
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Establishing a positional information assay for brain ventricle mutants and investigating the choroid plexuses in zebrafish
… which the neural tube expands into three brain ventricles can be understood through genetic mutant analysis. Within the framework of a characterization of zebrafish mutants with brain ventricle phenotypes, I have developed an assay that looks for evidence of compromised gene expression patterns. …
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Contribution of the Purkinje System in Initiation and Maintenance of Arrhythmias
… of the Purkinje system and its interaction with ventricles in arrhythmogenesis and maintenance. Firstly, simulations were performed on a model of rabbit ventricles to explore Purkinje system contributions during ventricular fibrillation. A fractal method for growing the Purkinje system was …
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The formation and function of the brain ventricular system
… Therefore, formation of the vertebrate brain ventricles requires both production and retention of CSF. Although the embryonic brain ventricles contain large quantities of eCSF little is known about the function of the fluid or the mechanisms that drive fluid production. We developed a method …
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Investigating Diffusion Tensor Imaging Correlates of Cognitive Impairment In Idiopathic Normal Pressure Hydrocephalus and Alzheimer'S Disease
… the human brain cerebrospinal fluid (CSF)-filled ventricles is normal with aging, and because of this, it can be difficult for physicians to accurately diagnose and treat enlarged ventricles (ventriculomegaly), called hydrocephalus<sup>1</sup> (fluid or water in the brain) Ventriculomegaly occurs …
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Automatic segmentation of magnetic resonance images of the brain
… The resulting segmentations of the lateral ventricles and the caudate nuclei were compared to reference manual segmentations done by expert radiologists. The Tanimoto similarity coefficient was very good for the lateral ventricles (0.81) and good for the caudate nuclei (0.67).
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