Dissertations / Theses on the topic 'Frequency of cardiac reductions'
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Haizlip, Kaylan Michelle. "Manipulation and Alterations of the Force Frequency Response in Isolated Cardiac Muscle." The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1337778482.
Full textVarian, Kenneth Dean. "Cardiac Myofilament Calcium Sensitivity in Health and Disease." The Ohio State University, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=osu1211898886.
Full textTuan, Jiun Haur. "Electrophysiological substrates of atrial fibrillation : a frequency domain study of intra-cardiac electrograms." Thesis, University of Leicester, 2011. http://hdl.handle.net/2381/10105.
Full textMackey, Sean Charles. "A dynamic model of radio frequency catheter ablation for the treatment of cardiac arrhythmias." Diss., The University of Arizona, 1994. http://hdl.handle.net/10150/187023.
Full textCelentano, Laura J. "RFID-assisted wireless sensor networks for cardiac tele-healthcare /." Online version of thesis, 2007. http://hdl.handle.net/1850/5719.
Full textKassiri, Zamaneh. "Frequency- and hypertrophy-mediated alterations in twitch force and intracellular calcium transients in rat cardiac trabecula." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp01/MQ34088.pdf.
Full textCloherty, Shaun Liam Graduate School of Biomedical Engineering Faculty of Engineering UNSW. "Cellular interaction in the cardiac pacemaker: a modelling study." Awarded by:University of New South Wales. Graduate School of Biomedical Engineering, 2005. http://handle.unsw.edu.au/1959.4/22512.
Full textChung, Jae-Hoon. "Regulation of Human Cardiac Muscle Contraction and Relaxation in Health and Disease." The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1522851185767187.
Full textKer, James. "Cardiac memory T wave frequency as an electrocardiographic surrogate for structural myocardial alteration in the hearts of dorpersheep." Thesis, University of Pretoria, 2006. http://hdl.handle.net/2263/28373.
Full textThesis (PhD (Human Physiology))--University of Pretoria, 2006.
Physiology
unrestricted
Roper, Ryan Todd. "A Study of Radiofrequency Cardiac Ablation Using Analytical and Numerical Techniques." Diss., CLICK HERE for online access, 2003. http://contentdm.lib.byu.edu/ETD/image/etd262.pdf.
Full textBrockman, Erik. "TIME-FREQUENCY ANALYSIS OF INTRACARDIAC ELECTROGRAM." DigitalCommons@CalPoly, 2009. https://digitalcommons.calpoly.edu/theses/188.
Full textLi, Qian. "Ultrasound Current Source Density Imaging in Live Rabbit Hearts Using Clinical Intracardiac Catheter." Diss., The University of Arizona, 2015. http://hdl.handle.net/10150/556733.
Full textSpicher, Nicolai [Verfasser], and Mark E. [Akademischer Betreuer] Ladd. "Time-frequency analysis of optical and electrical cardiac signals with applications in ultra-high-field MRI / Nicolai Spicher ; Betreuer: Mark E. Ladd." Duisburg, 2020. http://d-nb.info/1221061801/34.
Full textCosta, Gláucia Grüninger Gomes. "Desenvolvimento de sistemas bio-telemétricos para a medida da freqüencia cardíaca e do ritmo respiratório." Universidade de São Paulo, 1986. http://www.teses.usp.br/teses/disponiveis/54/54132/tde-01062009-112145/.
Full textThe development of physics made action in various fields possible, and more recently, in Medicine, studies of heart frequency and breathing rhythm give important information about physiological status and are useful for diagnostics and therapeutics. In these studies, in many cases, it is necessary that variables could be monitored by telemetry, as p.e. observation of athletes and also before and post-glutted patients during sport practices, and studies of animals in their own habitat. We are developing, therefore, a telemetric prototype which is capable of measuring them by non-invasive methods (methods that exempt a surgical exposure), based upon application of the Ultrasonic Doppler effect and of the Mechanical Movement of thorax. This prototype consist of a group of transmitters and receivers which are getting heart beat frequency and breathing rhythm recorded by such forms: audible, graphic and numerical, in before established periods.
Zeder, Marius Philipp [Verfasser], and Thomas [Akademischer Betreuer] Bein. "Frequency of delirium in non-cardiac surgical and medical intensive-care patients — results from a comparative, prospective, observational study / Marius Philipp Zeder ; Betreuer: Thomas Bein." Regensburg : Universitätsbibliothek Regensburg, 2019. http://d-nb.info/1184573913/34.
Full textCoelho, Andrês Sales. "Parâmetros fisiológicos de cães submetidos a treinamento em esteira." Universidade Federal de Viçosa, 2007. http://locus.ufv.br/handle/123456789/4938.
Full textCoordenação de Aperfeiçoamento de Pessoal de Nível Superior
Lack of physical activity and highly caloric food have deeply affected canine health, leading them to develop many kinds of diseases related to the heart, obesity, joints and even behavior. In this way, preventive and curative steps such as physical activities and canine sports have been taken in order to guarantee that the dogs have a long and healthful life. However, for those steps to be taken, it is essential that the animals have a good physical conditioning, which can be determined by many different physiological parameters. The present work had as objective to evaluate the physiological parameters for dogs trained in a treadmill. Eight animals of different breeds, fed with the same commercial ration and lodged in individual kennels, were used. After clinical evaluation, the dogs rested 30 days. On the 19th day, the animals went through an evaluation of the following physiological parameters: cardiac frequency (CF), respiratory frequency (RF), body temperature (BT), lactate and sanguineous glucose. After that period, they were submitted to a test of gradual load in a treadmill, to measure the parameters in the maximum effort, returning to the point of rest, which was called recovery time. Using these data, the dogs inferior and superior limits of the CF as well as the intensity of the training were determined. The animals were divided in groups 1 and 2, which trained five and three times a week, respectively, in alternated days for five weeks. After that, they were, once again, submitted to the test of gradual load to measure the values of the physiological parameters. Among the dogs of the first group, it was observed a reduction of the CF (P<0.05), during the test of maximum effort, since the higher estimative of 214 bpm dropped to 205.33 bpm. These results suggest that there was an improvement in the cardiovascular conditioning for this group. For the animals of group 1, the CF at rest, after training, was lower compared to the period before the training, (P<0.05), going from 75 ± 5.65 to 67 ± 6.83 bpm. Comparing the before and after periods of exercises, the recovery of the CF was faster (P<0.05) for the dogs in group 2. The training five days a week offered a reduction (P<0.05) in the sanguineous lactate concentration at the same training speed, before and after training, suggesting a better physical conditioning. For the two groups, after training, it was observed significant alterations in the BT, remaining lower during all the test of progressive load. Concerning the RF and glucose, it was not observed significant differences in both groups. To sum up, the changes in the CF, BT and lactate indicate that there was an improvement in the physical conditioning of the dogs which trained five days a week, reason why this protocol is recommended.
A falta de atividade física de cães aliada a uma alimentação de alto teor energético têm afetado seriamente a saúde dos cães, levando-os a desenvolver vários tipos de problemas associados ao coração, à obesidade, às articulações e até mesmo ao comportamento. Desta forma, visando oferecer condições para que os animais tenham uma vida longa e saudável, medidas preventivas e curativas, como práticas de atividades físicas e esportes caninos, têm sido utilizadas. No entanto, para o desenvolvimento dessas atividades é fundamental um bom condicionamento físico, o que pode ser determinado por vários parâmetros fisiológicos. O presente trabalho teve como objetivo a avaliação dos parâmetros fisiológicos de cães treinados em esteira. Foram utilizados oito animais de raças diferentes, alimentados com a mesma ração comercial e alojados em canis individuais. Depois de uma avaliação clínica, os cães passaram por período de 30 dias de repouso, sendo que no 19º dia foram obtidos os seguintes parâmetros fisiológicos: freqüência cardíaca (FC), freqüência respiratória (FR), temperatura corporal (TC), lactato e glicose sangüínea. Após esse período, eles foram submetidos a um teste de cargas progressivas em esteira, para se determinar os mesmos parâmetros no esforço máximo e até retornarem aos valores de repouso, o que foi chamado de período de recuperação. A partir desses dados, foram determinados os limites inferior e superior da FC dos cães e a intensidade dos exercícios. Os animais foram divididos nos grupos 1 e 2, que treinaram 5 e 3 vezes por semana, respectivamente, em dias alternados durante cinco semanas. Depois disso, foram novamente submetidos ao teste de cargas progressivas para que os valores dos parâmetros fisiológicos fossem novamente determinados. Nos cães do primeiro grupo, foi observada uma diminuição da FC (P<0,05), durante o teste de esforço máximo, sendo que a máxima estimada de 214 bpm passou para 205,33 bpm. Esses resultados sugerem que houve uma melhora no condicionamento cardiovascular para esse grupo. Para os animais do grupo 1, a FC referente ao repouso, após o treinamento foi menor que antes do treinamento (P<0,05), variando de 75 ± 5,65 para 67 ± 6,83 bpm. Quando comparada antes e após o treinamento, a recuperação da FC foi mais rápida (P<0,05) para os cães do grupo 2. O treinamento 5 vezes por semana proporcionou diminuição (P<0,05) da concentração de lactato sanguíneo em uma mesma velocidade de teste antes e após o treinamento, sugerindo uma melhora no condicionamento físico dos cães. Para os dois grupos após o treinamento, foram observadas reduções significativas na TC, que se manteve menor durante todo o teste de cargas progressivas. Quanto à FR e glicose não foram observadas diferenças significativas em ambos os grupos. Concluindo, as alterações verificadas na FC, TC e lactato indicam que houve melhora no condicionamento físico dos cães treinados 5 vezes por semana, recomendando-se esse protocolo.
Barbosa, Daniel. "Automated assessment of cardiac morphology and function : An integrated B-spline framework for real-time segmentation and tracking of the left ventricle." Thesis, Lyon, INSA, 2013. http://www.theses.fr/2013ISAL0111.
Full textThe fundamental goal of the present thesis was the development of automatic strategies for left ventricular (LV) segmentation and tracking in RT3DE data. Given the challenging nature of RT3DE data, classical computer vision algorithms often face complications when applied to ultrasound. Furthermore, the proposed solutions were formalized and built to respect the following requirements: they should allow (nearly) fully automatic analysis and their computational burden should be low, thus enabling real-time processing for optimal online clinical use. With this in mind, we have proposed a novel segmentation framework where the latest developments in level-set-based image segmentation algorithms could be straightforwardly integrated, while avoiding the heavy computational burden often associated with level-set algorithms. Furthermore, a strong validation component was included in order to assess the performance of the proposed algorithms in realistic scenarios comprising clinical data. First, the performance of the developed tools was evaluated from a global perspective, focusing on its use in clinical daily practice. Secondly, also the spatial accuracy of the estimated left ventricular boundaries was assessed. As a final step, we aimed at the integration of the developed methods in an in-house developed software suite used for research purposes. This included user-friendly solutions for efficient daily use, namely user interactive tools to adjust the segmented left ventricular boundaries
Vilhegas, Leonardo Zane. "Desenvolvimento de um protótipo para monitoração de saturação de oxigênio e freqüência cardíaca para roedores." Universidade de São Paulo, 2007. http://www.teses.usp.br/teses/disponiveis/3/3140/tde-20072009-180319/.
Full textThe equipments use to monitoring physiological parameters isnt just crucial in patients who are submitted to some medical procedures but it is also of extreme value for animals in similar use. This project has as main objective the development of a monitor oxygen saturation and cardiac frequency for mice; the system is compound of a compact prototype device and optic sensor. In the present work, the Microchip microcontrollers technologies had been used, to realize many digitalization; the USB technology interface, to realize the communication with computers and the interface development developed with the available National Instruments software, the LabVIEW. In this study, the developed system was used in mice and have been realized many evaluations in laboratory and field for the prototype validation device. The cardiac beatings and oxygen saturation, as much in rest how in movement they had been detected by the prototype. The values of heart rate had varied of 545 to 700 while the values of oxygen saturation had varied of 80 to 95%.
Brito, Deusdete de Sousa. "Cálculo da Frequência Instantânea Cardíaca Utilizando o Algoritmo LMS e uma Interface de Aquisição de Dados." Universidade Federal do Maranhão, 2002. http://tedebc.ufma.br:8080/jspui/handle/tede/318.
Full textConselho Nacional de Desenvolvimento Científico e Tecnológico
In this work we consider the calculation of the heart instantaneous frequency from the estimate of the weights, gotten through LMS algorithm, (Least Mean Squares) when functioning as spectrum analyzer. It is known that the electrocardiogram (ECG) is a signal that is characterized for a repetitive regularity, which can be called quasi-periodicity. We explore this characteristic to extract the instantaneous frequency of the referred signal. For this, we use the LMS as a spectral analyzer. We use as reference inputs pairs of sines and cosines, inside the frequency band where if it finds the frequency of the desired signal, namely, the heart frequency. The algorithm estimates the frequency desired in real time, with the signal acquired through a data acquisition interface Intel 80C31. The results obtained show that the algorithm can be recommended for this purpose, as besides being easily implemented and generating small computational load it estimates the heart instantaneous frequency with a relative mean error of 0.025 which represent a difference of 18.89% between the two methods.
Neste trabalho propomos o cálculo da frequência instantânea cardíaca a partir da estimativa do espectrograma dos pesos sinápticos, obtidos através do algoritmo LMS, (Least Mean Square) quando funcionando como analisador de espectro. Sabe-se que o eletrocardiograma (ECG) é um sinal que se caracteriza por uma regularidade repetitiva, que se pode chamar quasiperiodicidade. Exploramos aqui essa característica para extrair a frequência instantânea do referido sinal. Para isso, utilizamos o LMS como analisador de espectro. Utilizamos como entradas de referència pares de senos e cossenos, dentro da faixa de frequência em que se encontra a frequência do sinal desejado, no caso, a frequência cardíaca. O algoritmo estima a frequência desejada em tempo real, com obtenção do sinal através de uma interface de aquisição de dados Intel 80C31. Os resultados obtidos mostraram que o algoritmo pode ser recomendado pra esta finalidade, pois além de ser facilmente implementável e por gerar pequena carga computacional ele estimou a frequência instantânea cardíaca com um erro relativo médio de 0.025 que representa uma diferença de 18.89% entre os dois métodos.
Marques, JoÃo Alexandre LÃbo. "SISCTG- an intelligent systems for classification of cardiotocography signals for help diagnosis doctor." Universidade Federal do CearÃ, 2007. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=2046.
Full textThe accurate analysis of the fetal heart rate (FHR) and its correlation with uterine contractions (UC) allows the diagnostic and the anticipation of many problems related to fetal distress and the preservation of his life. This dissertation presents the results of an hibrid system based on a set of deterministic rules and fuzzy inference system developed to analyze FHR and UC signals collected by cardiotocography (CTG) exams. The studied variables are basal FHR, short and long term FHR variability, transitory accelerations and decelerations, these lasts classified by their type and number of ocurrencies. The system output is a first level diagnostics based on those input variables. The SISCTG system is developed using the Matlab version 7 script language. Tests and modeling issues used the Matlab Fuzzy Toolbox. The project also supports a multi-institutional agreement between Brazil and Germany, among the DETI - Departamento de Engenharia de TeleinformÂatica of the UFC â Universidade Federal do CearÂa, the MEAC - Maternidade-Escola Assis Chateaubriand), the TUM - Technische UniversitÃt MÃnchen, the Bundeswehr UniversitÃt MÃnchen and the Trium Analysis Online GmbH. The SISCTG results are very promising, correctly classifying all normal exams. This is the expected behavior, once CTG exams are classified as of low specificity, with the most interest focused in finding pathologies aspects, but not precisely identifying them. These results allow the projection of improvements to the proposed system, inserting new input variables, for example. The system validation methodology was based on the knowledge of Brazilian and German obstetricians.
A anÃlise acurada da freqÃÃncia cardÃaca fetal (FCF ou FHR - Fetal Heart Rate) correlacionada com as contraÃÃes uterinas maternas (UC - Uterine Contractions) permite gerar diagnÃsticos e a conseqÃente antecipaÃÃo de problemas diversos relativos ao bem estar fetal e a preservaÃÃo de sua vida. O presente trabalho apresenta os resultados de um sistema hibrido baseado em regras determinÃsticas e em um mÃdulo de inferÃncia nebuloso (fuzzy) para anÃlise de sinais de FCF e UC coletados atravÃs de exames denominados cardiotocografias (CTG). As variÃveis analisadas sÃo o valor basal da FCF, sua variabilidade de curto e de longo prazo, aceleraÃÃes transitÃrias e desaceleraÃÃes, sendo estas classificadas por seu tipo e pelo nÃmero de ocorrÃncias. A saÃda do sistema à o diagnÃstico em primeiro nÃvel, baseado nas informaÃÃes das variÃveis de entrada definidas. O sistema SISCTG à desenvolvido na linguagem de scripts do programa Matlab versÃo 7. Modelagens e testes sÃo realizados utilizando-se o Fuzzy Toolbox do programa Matlab. O projeto tambÃm conta com uma parceria multi-institucional entre o Brasil e a Alemanha, envolvendo a Universidade Federal do Cearà (UFC), atravÃs do Departamento de Engenharia de TeleinformÃtica (DETI) e da Maternidade-Escola Assis Chateaubriand (MEAC), a Technische UniversitÃt MÃnchen (TUM), a Bundeswehr UniversitÃt MÃnchen e a empresa Trium Analysis Online GmbH. Os resultados obtidos pelo SISCTG sÃo bastante promissores, classificando todos os exames normais corretamente. Este à o comportamento esperado, uma vez que CTGs sÃo exames de baixa especificidade, tendo como interesse maior encontrar indÃcios de patologias, sem a necessidade de identificÃ-las precisamente. Estes resultados permitem projetar o aperfeiÃoamento deste sistema com a inserÃÃo, por exemplo, de novas variÃveis de entrada. SÃo realizados procedimentos de validaÃÃo com mÃltiplos especialistas na Ãrea obstÃtrica tanto no Brasil quanto na Alemanha.
Černiauskaitė, Ina. "Slaugytojo vaidmuo prižiūrint centrinius venos kateterius reanimacijos ir intensyvios terapijos skyriuje." Master's thesis, Lithuanian Academic Libraries Network (LABT), 2014. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2009~D_20140626_192344-28544.
Full textThe goal of the study: to determine the role of a nurse in the maintenance of the central venous catheter (CVC) in the resuscitation and intensive care department. The objectives: to determine the influence of the central venous catheterization to the indexes of the main vital functions of the patients. To specify the most frequent venous complications and the reasons why they occur. To find out what nurses’ actions can reduce the risk of complications. To examine the professional knowledge of the nurses who work with central venous catheters in the resuscitation and intensive care departments. Research material and methods. Theoretical review of scientific literature, publications and articles. Document analysis method (utilized for the reasearch of patient’s with central venous catheters). Personal observation method. Observation of the main vital functions of 97 patients after central venous catheterization in the resuscitation and intensive care department. The questionnaire-based survey in order to examine the professional knowledge of the nurses who work with central venous catheters in the resuscitation and intensive care department. Discussion and analysis of the obtained results. Analysis of the statistical data using the Microsoft Office Excel 2003 and SPSS 16,0 for Windows software packages. The results and conclusions of the study. In order to determine the role of a nurse for the maintenance of central venous catheter, the observation research was conducted with... [to full text]
Lucas, Julie. "Intégrité fonctionnelle chez le poisson zèbre, Danio rerio, exposé à des concentrations sublétales d’hydrocarbures aromatiques polycycliques." Thesis, La Rochelle, 2013. http://www.theses.fr/2013LAROS422/document.
Full textThe increase of anthropogenic activities on coastal areas induces discharges of polycyclic aromatic hydrocarbons in aquatic ecosystem. PAHs effects depend on their concentration and the way of contamination, but also on the different developmental stages of the organism. In this context, the aim of our study was to observe the effects of an exposure to two PAHs mixes, pyrolytic and petrogenic, on the model species zebrafish Danio rerio. These chronicle exposures at sub-lethal concentrations were representative of contaminated areas. Biological responses of fish were estimated at individual levels through the assessment of aerobic metabolic scope, swimming and escape performance, which are considered to be relevant indirect measures of the fitness. Furthermore, measurements of cardiac frequency allowed observing PAHs impairments at sub-individual levels. These physiological performances were estimated (i) a several times of exposure (i.e. from 2-months juveniles to 6-months adults) and (ii) on their progeny, in order to observe parental effect of the PAHs exposure. An increase of aerobic metabolic scope was observed on the progeny of fish contaminated by pyrolytic mix. Regarding petrogenic PAHs exposure, the increase of aerobic metabolic scope was associated to increase of critical swimming speed in adults. This study will contribute to establishing a global vision of PAHs exposure impairments and to a better understanding of the regulating mechanisms of the main biological functions on which organism survival depends
Gercek, Cihan. "Immunité des implants cardiaques actifs aux champs électriques de 50/60 Hz." Thesis, Université de Lorraine, 2016. http://www.theses.fr/2016LORR0226/document.
Full textThe European Directive 2013/ 35 / EU specify minimum requirements for the protection of workers exposed to electromagnetic fields and define with implants as “workers at particular risk”. Regarding the implantable cardioverter defibrillator wearers (ICD) or pacemaker (PM), exposure to electric or magnetic field of extremely low frequency creates inductions inside the human body that generate interference voltage which may cause the dysfunction of the implant. This thesis investigates the electromagnetic compatibility of cardiac implants subjected to an electric field low frequency (50/60 Hz). Computational simulations are effectuated in order to design an experimental bench for the exposure of a phantom including pacemakers or implantable defibrillators. A provocative study is established to define the electric field thresholds for preventing any malfunction of the implant. In numerical simulations; a virtual human model (digital phantom containing a cardiac implant) was placed in an upright position in a vertical exposure to an electric field. The finite element method was used to define the inductions in the cardiac implant level with a resolution of 2 mm (CST® software). In the experimental part, a test bench designed to allow generating an electric field up to 100 kV / m at frequencies 50-60 Hz was constructed, optimized and employed to investigate the behavior of cardiac implants.Several configurations were studied. 54 active cardiac implants (43 pacemakers and 11 defibrillators) are submitted to very high electric field of 50-60 Hz (up to 100 kV / m) inside the experimental bench. No failure was observed for public exposure levels for most configurations (+ 99%) except for six pacemakers in the case of a configuration clinically almost inexistent: unipolar mode with maximum sensitivity and atrial sensing.The implants configured with a nominal sensitivity in bipolar mode are resistant to electric fields exceeding the low action levels (ALs), even for the most high ALs, as defined by 2013 / 35 / EU
Jančová, Ivana. "Porovnání parametrů pro stanovení srdeční asynchronie z vysokofrekvenčního signálu elektrokardiogramu." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2015. http://www.nusl.cz/ntk/nusl-221328.
Full textБогуш, В. Л., С. В. Гетманцев, В. Н. Фарионов, А. А. Раевский, И. Н. Смирнова, Д. А. Харько, V. Bogush, et al. "Изменение сердечно-сосудистой системы при акклиматизации в горах." Thesis, 2014. http://eir.nuos.edu.ua/xmlui/handle/123456789/4991.
Full textВизначалася частота серцевих скорочень, анаеробно-пульсовий поріг у спортсменів-бігунів у різних умовах, на рівнині і в горах, при режимах тренування, що змінюються. Отримані дані дозволяють оптимізувати процес тренування на різних етапах підготовки до змагань.
Frequency of cardiac reductions, anaerobic-pulse threshold for sportsmen-runners was determined, in different terms, on a plain and in mountains, at the modes there are trainings which change. Information is got allow to optimize a training process on the different stages of preparation to the competitions.
В разных условиях, на равнине и в горах, при изменяющихся режимах тренировки определялась частота сердечных сокращений, уровень анаэробного порога у спортсменов-бегунов. Полученные данные позволяют оптимизировать процесс тренировки на разных этапах подготовки к соревнованиям.
(6620237), Sokheang Thea. "Identification of Stiffness Reductions Using Partial Natural Frequency Data." Thesis, 2019.
Find full textOgimoto, Kayoko. "Cortisol, abdominal obesity, and reductions in inflammation after cardiac rehabilitation in non-diabetic coronary patients." Thesis, 2000. http://hdl.handle.net/1957/32661.
Full textGraduation date: 2001
Lai, Yu-Chi. "Lesion size estimator for cardiac radio-frequency ablation /." 2009. http://www.library.wisc.edu/databases/connect/dissertations.html.
Full textZhang, Jie. "Noncontact radio-frequency cardiac ablation for obtaining deeper lesions." 2002. http://catalog.hathitrust.org/api/volumes/oclc/50179384.html.
Full textTypescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 10-12).
Lau, Angus. "Frequency-selective Methods for Hyperpolarized 13C Cardiac Magnetic Resonance Imaging." Thesis, 2012. http://hdl.handle.net/1807/34779.
Full textTungjitkusolmun, Supan. "Finite element modeling of radio-frequency cardiac and hepatic ablation /." 2000. http://www.library.wisc.edu/databases/connect/dissertations.html.
Full textAntunes, Eduardo José Pereira. "Cardiac morphological changes induced by low-frequency noise in rats." Tese, 2013. https://repositorio-aberto.up.pt/handle/10216/69812.
Full textAntunes, Eduardo José Pereira. "Cardiac morphological changes induced by low-frequency noise in rats." Doctoral thesis, 2013. https://repositorio-aberto.up.pt/handle/10216/69812.
Full textBishay, Rami. "High-frequency ultrasound assessment of cardiac graft rejection in heterotopically transplanted mice." 2007. http://link.library.utoronto.ca/eir/EIRdetail.cfm?Resources__ID=453010&T=F.
Full textHung, Chung-Lieh, and 洪崇烈. "The association between alcohol use frequency, dose, and cardiac structure and function." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/d56e58.
Full text國立陽明大學
臨床醫學研究所
105
Background and Objectives: Chronic excessive alcohol consumption may cause detrimental effects on cardiac structure and function. Evidence of preclinical LV and left atrial (LA) functional alterations in alcohol consumers prior to the development of overt heart failure or AF may be clinically important based on the view point of primary preventive medicine, especially for light to moderate users. Method: We consecutively studied 3,946 asymptomatic participants (mean age: 49.9 years, 35% female) from an ongoing cardiovascular health screening program at a tertiary medical center in Northern Taipei, Taiwan. Tissue Doppler Imaging (TDI), left ventricular (LV) strain (S) and left atrial (LA) strain (S), strain rate (SR) were all measured by echocardiography. Study participants were categorized based on graded alcohol consumption on a weekly basis: 1) Group A Non-drinkers: non-users or <1 drink/week, n=3,464; 2) Group B Light drinkers: 1-6 drinks/week, n=323; 3) Group C Moderate drinkers: >6 drinks/week, n=89; and 4) Group D Past drinkers (n=70). ANOVA with post hoc paired comparisons and multivariate regression models between dosage of alcohol consumption and LA/LV structural/mechanical changes were examined. Experimental animal model was conducted by randomizing male 4-month-old C57BL/6 mice into one of three groups: 1) liquid diet (control group [Ctrl]; or either a 2) 4% or 3) 6% alcohol liquid diet as their only fluid and food source for continuous 14 weeks. Immunoconfocal imaging and Western immunoblotting analysis were performed to examine the myocardial tissue changes, with echocardiography and optical mapping used to assess altered cardiac structure/function and cardiac electrical conduction activation sequence and pattern. Main Findings: 1. Larger LV dimension, wall thickness, increasing LA volumes, greater LV mass index, as well as more prolonged deceleration time (DT), isovolumic relaxation time (IVRT) and lower’ relaxation E’ with relatively unchanged LV ejection fraction (LVEF) (p: 0.345) were observed across 3 alcohol consumption groups (ANOVA p<0.001). Significant reduction of TDI-based myocardial contraction velocity S’was also observed (p: 0.0092); 2. A markedly worsened longitudinal systolic function in terms of lower averaged LV longitudinal strain (GLS) was observed (-18.32±2.29% vs -18.11±2.3%/-17.94±2.39%) in Non- vs Light/ Moderate drinkers (ANOVA p<0.001) (Coef: 0.25 [95% CI: 0.05 to 0.45] and 0.55 [95% CI: 0.17 to 0.92] with Non-Drinkers as reference group in multivariate models), which were accompanied by significant, graded reduction of LA strain (S) and LA diastolic strain rate (SRe) across 3 alcohol categories (all p<0.05). In general, worse GLS, LAS, SRe and SRs were observed in light-moderate drinkers compared to non-drinkers (all p<0.001), which followed a dose-response relationship. Finally, these differences did not change after careful 2:1 propensity-matching (n=760 for non- v.s. n=380 for light-moderate drinkers [n=307 and 73 for Light and Moderate Drinkers, respectively]); 3. In our experimental animal model, chronic alcohol-fed C57BL/6 mice, especially 6% mice, demonstrated substantially increased ventricular collagen I depots and fibrotic turnover, elicited macrophage infiltration of myocardium and contractile dysfunction. A specific perturbed and disturbed pattern and lower ventricular propagation velocity in both 4 and 6% alcohol mice groups were observed by optimal mapping (p<0.05). Down-regulated (nearly 50%), remodeled Cx43 together with clustered and diminished ordered membrane Nav1.5 distribution were also observed in mice feeding with alcohol diet, which in conjunction with increased cardiac fibrosis may explain the observed myocardial electromechanical dysfunctions. Conclusions: Our findings suggest that habitual alcohol consumption, even at relatively low weekly doses, may be associated with detrimental effects on atrial and ventricular functions in a dose-response fashion independent of other clinical factors or life styles. Our animal model supported mechanistic insights into the pathological understanding of these electromechanical functional alterations at a cellular and molecular level.
Kahlbau, Ana Maria Pereira Alves Lousinha. "New observations on cardiac morphological changes induced by low-frequency noise and infrasound in rats." Tese, 2020. https://hdl.handle.net/10216/127509.
Full textKahlbau, Ana Maria Pereira Alves Lousinha. "New observations on cardiac morphological changes induced by low-frequency noise and infrasound in rats." Doctoral thesis, 2020. https://hdl.handle.net/10216/127509.
Full textBeggs, Clive B., Simon J. Shepherd, and Kevin G. Kerr. "Increasing the frequency of hand washing by healthcare workers does not lead to commensurate reductions in staphylococcal infection in a hospital ward." 2008. http://hdl.handle.net/10454/584.
Full textKrishna, Abhilash. "Multiphysics model of a cardiac myocyte: A voltage-clamp study." Thesis, 2012. http://hdl.handle.net/1911/71664.
Full textMakedonov, Ilia. "Investigation of the Effects of Aging and Small Vessel Disease on Cardiac Frequency Signal in Cerebral White Matter as Imaged by Echo Planar Imaging using Magnetic Resonance." Thesis, 2012. http://hdl.handle.net/1807/32259.
Full textBola, Mariana Gomes. "Avaliação e prescrição de exercício. Caracterização da intensidade da Modalidade de Spinning." Master's thesis, 2018. http://hdl.handle.net/10400.5/19301.
Full textThe present report was developed in order to achieve the title of Master in Exercise and Health from Faculdade de Motricidade Humana and reflects the work developed and the knowledge acquired during one academic year of internship as exercise physiologist in chronic diseases and weight management, in gym context, at Ginásio Clube Português (GCP). In the first section of the report, it was developed a theoretical framework of the professional practice, systematising informations regarding an apparently healthy, with cardiovascular disease and over weighted with obesity individual. It is also described for the same individual, the importance and the benefits of physical exercise and its prescription. In the second section, there is a description of the experience lived within the internship local and all the interventions made, the reasons that moved me in choosing this institution, all the tasks performed, the main obstacles along the internship and the contributions made to the gym – behaviour of cardiac frequency in Spinning classes. At the end, a reflection regarding the path made along the present academic year, highlighting the objectives achieved and not achieved and the difficulties felt is made.