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Dissertations / Theses on the topic 'Surface fibrillation'

Author: Grafiati

Published: 7 July 2024

Last updated: 7 July 2024

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1

Guillem, Sanchez Maria De La Salud. "Activation patterns in atrial fibrillation: contributions of body surface potential mapping." Doctoral thesis, Universitat Politècnica de València, 2009. http://hdl.handle.net/10251/3922.

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La fibrilación auricular (FA) es una de las arritmias cardiacas más comunes, afectando a alrededor del 10 % de los mayores de 70 años. A pesar de su alta incidencia en la población, los mecanismos que desencadenan y mantienen la FA son inciertos. Aunque existen diversos tratamientos quirúrgicos y farmacológicos, el éxito de los tratamientos contra la FA es muy bajo. La causa de esta baja tasa de éxito de las diferentes terapias es que no existen criterios de selección de pacientes que permitan pronosticar qué terapia puede ser más efectiva para cada paciente. Una de las formas que se han propu

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2

Rodrigo, Bort Miguel. "Non-invasive identification of atrial fibrillation drivers." Doctoral thesis, Universitat Politècnica de València, 2016. http://hdl.handle.net/10251/75346.

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Atrial fibrillation (AF) is one of the most common cardiac arrhythmias. Nowadays the fibrillatory process is known to be provoked by the high-frequency reentrant activity of certain atrial regions that propagates the fibrillatory activity to the rest of the atrial tissue, and the electrical isolation of these key regions has demonstrated its effectiveness in terminating the fibrillatory process. The location of the dominant regions represents a major challenge in the diagnosis and treatment of this arrhythmia. With the aim to detect and locate the fibrillatory sources prior to surgical proce

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3

Meo, Marianna. "Caractérisation spatio-temporelle de l’électrocardiogramme de surface pour prédire le résultat de l’ablation par cathéter de la fibrillation atriale persistante." Thesis, Nice, 2013. http://www.theses.fr/2013NICE4122/document.

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Responsable d’un quart des accidents vasculaires cérébraux, la fibrillation auriculaire (FA) est l’arythmie cardiaque la plus répandue. La thérapie d’ablation par cathéter (CA) est de plus en plus utilisée pour traiter la FA, mais ses effets sur le substrat cardiaque ne sont pas suffisamment compris, d’où un taux de réussite très variable. L’électrocardiogramme (ECG) à 12 voies représente un outil non invasif peu coûteux pour caractériser la FA à partir de l’activité électrique du cœur. Cependant, les prédicteurs classiques de l’issue de la CA présentent plusieurs inconvénients, notamment leur

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4

Bojarnejad, Marjan. "Relationship between body surface potential maps and atrial electrograms in patients with atrial fibrillation." Thesis, University of Newcastle upon Tyne, 2013. http://hdl.handle.net/10443/2305.

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Atrial fibrillation (AF) is the most common cardiac arrhythmia. It is distinguished by fibrillating or trembling of the atrial muscle instead of normal contraction. Patients in AF have a much higher risk of stroke. AF is often driven by the left atrium (LA) and the diagnosis of AF is normally made from lead V1 in a 12-lead electrocardiogram (ECG). However, lead V1 is dominated by right atrial activity due to its proximal location to the right atrium (RA). Consequently it is not well understood how electrical activity from the LA contributes to the ECG. Studies of the AF mechanisms from the LA

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5

Thakur, Garima. "Surface Chemistry and Spectroscopic Approach to Study Neurodegenerative Diseases." Scholarly Repository, 2010. http://scholarlyrepository.miami.edu/oa_dissertations/499.

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Accumulation or aggregation of amyloidogenic proteins in the brain plays a central role in neurodegenerative diseases. The most common and highly growing form of dementia in the elderly population is Alzheimer's disease (AD) followed by Parkinson's disease (PD). The major proteins associated are amyloid beta (Abeta) and alpha-synuclein (alpha-syn) in AD and PD, respectively. These proteins are released or found near the neuronal membranes in the brain. Consequently to understand the behavior of the proteins using a model membrane system becomes an important facet of understanding these disease

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6

Julián, Seguí Matilde. "Study on the non-linear metrics contribution to estimate atrial fibrillation organization from the surface electrocardiogram." Doctoral thesis, Universitat Politècnica de València, 2015. http://hdl.handle.net/10251/56150.

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[EN] Atrial fibrillation (AF) is the most frequently diagnosed arrhythmia, characterized by an uncoordinated atrial electrical activation, thus causing the atria to be unable to pump blood effectively. The prevalence of AF is expected to increase significantly in the next decades as the population ages. However, both the knowledge and the treatment of this arrhythmia still have to experiment a significant progress. Previous studies have reported that AF organization, which can be defined as the repetitiveness degree of the atrial activity pattern, correlates with the arrhythmia status as well

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7

Nguyen, Sy Hung Stéphane. "La dispersion de la repolarisation ventriculaire : étude critique, à partir de la catégorie de surface." Montpellier 1, 1995. http://www.theses.fr/1995MON11154.

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8

Driamov, Sergey. "The self-maintaining nature of ventricular fibrillation : contribution of L-type Ca²⁺ channels and Na⁺/Ca²⁺ exchange to cardiomyocyte Ca²⁺ overload in ventricular fibrillation : surface fluorescence study in isolated perfused rat hearts /." Basel : [s.n.], 2004. http://edoc.unibas.ch/diss/DissB_6954.

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9

Meo, Marianna. "Caractérisation spatio-temporelle de l'électrocardiogramme de surface pour prédire le résultat de l'ablation par cathéter de la fibrillation atriale persistante." Phd thesis, Université Nice Sophia Antipolis, 2013. http://tel.archives-ouvertes.fr/tel-00940440.

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Responsable d'un quart des accidents vasculaires cérébraux, la fibrillation auriculaire (FA) est l'arythmie cardiaque la plus répandue. La thérapie d'ablation par cathéter (CA) est de plus en plus utilisée pour traiter la FA, mais ses effets sur le substrat cardiaque ne sont pas suffisamment compris, d'où un taux de réussite très variable. L'électrocardiogramme (ECG) à 12 voies représente un outil non invasif peu coûteux pour caractériser la FA à partir de l'activité électrique du cœur. Cependant, les prédicteurs classiques de l'issue de la CA présentent plusieurs inconvénients, notamment leur

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10

Colman, Michael Alan. "Development of a biophysically detailed model of the human atria for the investigation of the mechanisms of atrial arrhythmias." Thesis, University of Manchester, 2013. https://www.research.manchester.ac.uk/portal/en/theses/development-of-a-biophysically-detailed-model-of-the-human-atria-for-the-investigation-of-the-mechanisms-of-atrial-arrhythmias(29e4f51f-6ead-43e4-8574-eae9e4e1eb26).html.

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Atrial arrhythmias are the most prevalent sustained cardiac arrhythmias. Rates of hospitalisation and costs incurred to healthcare organisations are increasing in epidemic proportions. Despite this, the mechanisms of the transition from sinus rhythm to arrhythmic states are not well understood. The high level of regional electrical heterogeneity observed in the atria is thought to contribute towards the high prevalence of atrial arrhythmias. However, current computer models of the intact human atria only account for a small degree of this regional electrical heterogeneity, and do not include d

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11

Pedrón, Torrecilla Jorge. "Non-invasive Reconstruction of the Myocardial Electrical Activity from Body Surface Potential Recordings." Doctoral thesis, Universitat Politècnica de València, 2015. http://hdl.handle.net/10251/58268.

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[EN] The behavior of the heart is governed by electrical currents generated in the myocardium, and therefore, the study of the cardiac electrical activity is essential for the diagnosis of cardiac diseases. The forward problem of the electrocardiography (FP) entails the calculation of the torso potentials from the electrical activity of the heart and the 3D body model, while the inverse problem (IP) resolution allows the noninvasive reconstruction of the electrical activity of the heart from surface potentials. The IP is of great importance in clinical applications since it allows estimating

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12

Tan, Nolwenn. "Caractérisation et détection des micro-potentiels anormaux associés aux arythmies ventriculaires létales, par analyse des signaux électrocardiographiques haute-résolution enregistrés à la surface du torse." Thesis, Bordeaux, 2021. http://www.theses.fr/2021BORD0095.

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Les morts subites représentent environ 50 000 décès en France, chaque année. Ces décès sont, dans plus de la moitié des cas, la conséquence d'arythmies ventriculaires, telles que les tachycardies ventriculaires (TV) ou les fibrillations ventriculaires (FV). Ces arythmies surviennent principalement chez les patients atteints de cardiopathie structurelle. Les examens d'imagerie, sont utilisés afin de détecter des zones anormales du myocarde associées aux cardiopathies structurelles. L'activation électrique dans ces zones est altérée, créant des potentiels de faibles amplitudes pouvant être mesur

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13

Liu, Taoming. "A MAGNETICALLY-ACTUATED ROBOTIC CATHETER FOR ATRIAL FIBRILLATION ABLATION UNDER REAL-TIME MAGNETIC RESONANCE IMAGING GUIDANCE." Case Western Reserve University School of Graduate Studies / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=case1484654444253783.

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14

El, Khoury Rouphaël Samer. "Étude comparative du comportement à l'impact et en fatigue avant et après impact de stratifiés à plis unidirectionnels de type lin/époxy et verre/époxy." Electronic Thesis or Diss., Chasseneuil-du-Poitou, Ecole nationale supérieure de mécanique et d'aérotechnique, 2024. http://www.theses.fr/2024ESMA0006.

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Ces travaux de thèse sont réalisés dans un contexte écologique avec l’objectif de développer de nouveaux biocomposites. Les renforts de lin utilisés ont été préparés selon un procédé inspiré de l’industrie papetière. Chaque pli du composite était constitué d’un renfort unidirectionnel à fils de lin retenus entre eux par une fine couche mat de lin agissant comme liant. La projection par centrifugation de fibres courtes de lin sur la couche de fils continus a permis de maintenir les fils parallèles les uns aux autres, sans recourir à de la couture ou du tissage. De plus, pour certains échantillo

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15

Liberos, Mascarell Alejandro. "Mathematical modeling approaches for the diagnosis and treatment of reentrant atrial tachyarrhythmias." Doctoral thesis, Universitat Politècnica de València, 2016. http://hdl.handle.net/10251/62166.

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[EN] Atrial tachyarrhythmias present a high prevalence in the developed world, and several studies predict that in the coming decades it will be increased. Micro or macro-reentrant mechanisms of the electrical wavefronts that govern the mechanical behavior of the heart are one of the main responsibles for the maintenance of these arrhythmias. Atrial flutter is maintained by a macro-reentry around an anatomical or functional obstacle located in the atria. In the case of atrial fibrillation, the hypothesis which describes high frequency rotors as dominant sources of the fibrillation and responsi

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16

Liuba, Ioan. "Focal atrial tachycardia : Insights concerning the arrhythmogenic substrate based on analysis of intracardiac electrograms and inflammatory markers." Doctoral thesis, Linköping : Department of Medical and Health Sciences, Linköping University, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-20461.

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17

Bun, Sok-Sithikun. "Quantification non invasive de la fibrose cardiaque diffuse par imagerie de résonance magnétique et par cartographie endocavitaire." Thesis, Aix-Marseille, 2018. http://www.theses.fr/2018AIXM0235/document.

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La fibrose cardiaque fait le lit des arythmies cardiaques, qu’elles soient atriales ou ventriculaires. L’IRM est devenue un outil non invasif indispensable pour diagnostiquer la présence de fibrose au niveau cardiaque, mais offre également des informations pronostiques, ainsi que pour le suivi des patients atteints de fibrillation auriculaire (FA), notamment persistante. La technique de référence reste le rehaussement tardif après injection de gadolinium, permettant de révéler des régions localisées de fibrose. Notre travail a consisté en la mise au point d’une technique non invasive (par la m

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18

Su, Yueh-Yun, and 蘇月雲. "Nonlinear Analysis in Discrimination of Atrial Flutter and Atrial Fibrillation from Surface Electrocardiogram." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/36862529506287454275.

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碩士<br>國立陽明大學<br>醫學工程研究所<br>92<br>Atrial flutter (AFL, including typical and atypical) and atrial fibrillation (Af) have different generating mechanisms in atrium. However, they are often cross-classified on the surface ECG. During AFL and Af, atrial activities appear disordered and lose the regular rhythm. Nonlinear analysis has recently been applied to electrograms, and atrial arrhythmia has shown evidence that indicates the possibility of deterministic chaos. In this study, we applied methods from the theory of nonlinear dynamics to discriminate electrograms of atrial flutter and fibrillatio

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19

Lu, Cheng Yu, and 呂承祐. "Atrial activity extraction from surface electrocardiogram and heart period analysis in patients with atrial fibrillation." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/z78czy.

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20

Perea, Lugo Adriana. "Comparison of Average Heart Rates Determined by Surface ECG and 24-Hour Ambulatory ECG (Holter) in Dogs with Spontaneous Atrial Fibrillation." Thesis, 2010. http://hdl.handle.net/1969.1/ETD-TAMU-2010-12-8616.

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The purpose of this study was to compare the heart rates of dogs presenting with spontaneous atrial fibrillation (AF) by a surface electrocardiogram (ECG) and a 24 hour ambulatory ECG (Holter recording) in order to determine if there was a difference between these two diagnostic tests. Seven dogs with clinically stable, spontaneous AF were evaluated with a 6 lead surface ECG (MAC 5000, GE® Milwaukee) and a Holter monitor (Monitor device: LifecardCE Delmar Reynolds Medical, Holter analysis:Aria Holter software). Statistical analyses, including t-tests and linear regression models, were performe

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