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 183 for “"Stenosis"”.
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Congenital Hypertrophic Pyloric Stenosis
<p><strong>[Abstract Not Included]</strong></p> <p><strong>[Signature page Not Included]</strong></p>
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Automated stenosis quantification in coronary arteriograms
… the arteries diameter and percent diameter stenosis. As the software runs within a second, we conclude that this technique is capable of immediate estimation of the extent of coronary artery lesions.
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Automated Prediction of Hepatic Arterial Stenosis
… causes of early transplant failure is arterial stenosis of the anastomotic junction. Early detection of transplant arterial stenosis can help prevent transplant failure and the need to re-transplant. Doppler ultrasound with manual measurements is the most common screening method, but it suffers …
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Predicting Aortic Stenosis Severity using Deep Learning
… of death globally. This thesis focuses on aortic stenosis, one of the most common and severe valve diseases. The evaluation of patients with suspected aortic stenosis includes echocardiography - an ultrasound based procedure that is used to visualize and evaluate the aortic valve. Interpretation …
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UNRAVELLING SEX-DEPENDENT MECHANISMS IN CALCIFIC AORTIC VALVE STENOSIS
Calcific aortic valve stenosis (CAVS) is the most common form of heart valve disease and affects about 3% of the population. Its prevalence increases with age, without a causal relation between ageing and CAVS development. To date, CAVS is a slow, progressive, multifactorial disorder considered to …
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Targeting Airway Microbiome Dysbiosis for Preventing Pediatric Subglottic Stenosis
Subglottic stenosis (SGS) is a significant health care complication following intubation in pediatric intensive care units. In the United States, SGS impacts nearly 8% of over 20,000 early-term patients annually, leading to comorbidities such as congenital heart disease and central nervous system …
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Understanding and measuring flow in aortic stenosis with MRI
In patients with aortic stenosis, accurate assessment of severity with echocardiography is central to surgical decision making. But, when image quality is poor or equivocal results obtained, another robust non-invasive technique would be invaluable. Cardiac magnetic resonance (CMR) may be a useful …
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Ex-vivo 3D assessment of carotid stenosis with ultrasound
Atherosclerosis causes heterogeneous remodeling of arterial structure and composition in the carotid vessel wall. It has been shown that the progression of the disease can be monitored by tracking changes in the carotid intima-media thickness (IMT). Non-invasive peripheral vascular ultrasound (U/S) …
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Hydrodynamic considerations of coronary blood flow with and without stenosis
Coronary stenosis is one of the most common heart diseases. Though not much is known concerning the growth of the stenosis in the coronary arteries, it is nevertheless possible to study the effects of the stenosis on the blood flow, and thus to determine its influence on myocardial perfusion. In …
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Assessment of aortic stenosis using modern non-invasive imaging techniques
INTRODUCTION: Aortic stenosis is characterised both by progressive narrowing of the valve and the hypertrophic response of the left ventricle. The purpose of this thesis was to study the contribution of inflammation and calcification to valve narrowing using Positron Emission and Computed …
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Congenital hypertrophic pyloric stenosis: a historical, anatomical, pathological and clinical study
PATHOLOGY: We feel we have shown, by histological sections of the normal pylorus and of the pylorus affected by congenital hypertrophy, that the pyloric sphincter itself is not directly affected by the hypertrophy.
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Carotid collar : a device for auscultory detection of carotid artery stenosis
… designed to aid in detecting carotid artery stenosis, a disease that increases the risk of stroke. This device consists of three electronic stethoscopes that record heart and carotid artery sounds and an electrocardiograph. A software application, ccrec, was written to make the device easy to …
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In silico and in vitro analysis of calcific and rheumatic aortic stenosis
Aortic stenosis (AS) is a valvular heart disease characterised by the narrowing of the aortic valve opening that restricts blood flow from the left ventricle to the aorta. AS is caused by different pathologies that each result in a specific valve opening morphology. The most common types of AS are …
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LES of pulsatile flow in the models of arterial stenosis and aneurysm
… blood flow due to the arterial stenosis and aneurysm. In the stenosed model, a cosine shape stenosis is placed at the upper wall of a 3D channel which reduces the cross-sectional area, whereas the aneurysm which is also placed at the upper wall dilates the channel cross-sectional …
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Cardiac magnetic resonance imaging assessment of aortic stenosis to improve clinical care
Background Aortic stenosis is the commonest valve disease requiring intervention in the developed world. Current guideline-based management strategies are based on historical observational data or expert opinion and may leave many patients with irreversible myocardial damage and adverse outcomes …
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Improving Preadmission Testing Nurses' Knowledge of Aortic Stenosis and Transcatheter Aortic Valve Replacement
… nurses’ knowledge of severe/critical aortic stenosis (AS), transcatheter aortic valve replacement (TAVR) procedure and patient selection, and satisfaction with knowledge by 10%. Rapid growth of the TAVR program has contributed to a gap in nursing knowledge leading to inconsistent patient care …
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The Surgical Management of Severe Aortic Stenosis In the Era of Transcatheter Aortic Valve Replacement
… option for severe and symptomatic aortic stenosis across the spectrum of surgical risk and has potentially transformed the surgical management of aortic stenosis. The objectives of this dissertation were: (1) To determine if the widespread introduction of TAVR had an impact on valve …
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Blood Vessel Segmentation and shape analysis for quantification of Coronary Artery Stenosis in CT Angiography
This thesis presents an automated framework for quantitative vascular shape analysis of the coronary arteries, which constitutes an important and fundamental component of an automated image-based diagnostic system. Firstly, an automated vessel segmentation algorithm is developed to extract the …
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Resistance to Apoptosis in Smooth Muscle Cells and Stent-Induced Stenosis in Coronary and Peripheral Arteries
… cases, success is limited by re-narrowing (restenosis) of the artery. Stenting offers the advantage of a slightly lower restenosis rate. However, this rate is still significant. Studies aimed at further understanding the restenotic disease process and the cells that contribute to it would aid …
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