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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
21

Analisador de desfibriladores e cardioversores. / Defibrillator and cardioverter analyzer.

Conrado Almeida de Oliveira 21 December 2009 (has links)
A desfibrilação e a cardioversão elétricas são os procedimentos terapêuticos padrões para o tratamento, respectivamente, das arritmias de fibrilação e taquicardia ventricular. O funcionamento eficaz e seguro de desfibriladores e cardioversores requer uma manutenção preventiva e corretiva sendo, portanto, necessária uma avaliação freqüente do desempenho destes equipamentos. Esta avaliação deve incluir a medição das energias e das tensões e correntes de pico além do tempo de sincronismo para o caso de cardioversores, sendo normalmente realizada por dispositivos denominados analisador de desfibriladores e cardioversores. Para que um analisador de desfibriladores e cardioversores esteja apto a realizar os ensaios prescritos pelas Normas pertinentes, ele deve atender a varias condições, portanto, é necessário a determinação de uma especificação tida como minimamente desejável para um analisador de desfibriladores e cardioversores. Este trabalho descreve o desenvolvimento de um analisador de desfibriladores e cardioversores de fácil utilização e capaz de medir a energia entregue a uma resistência de 50 W, simulando a impedância transtorácica, além das tensões e correntes de pico, positiva e negativa. O analisador também engloba um simulador de ECG, com o qual também se pode realizar ensaios para a medição do tempo de sincronismo de um cardioversor. Uma avaliação do reconhecedor de ritmos de desfibriladores externos automáticos também pode ser realizada através da simulação de arritmias passíveis ou não de desfibrilação. A forma de onda do pulso desfibrilatório é apresentada em um display tipo LCD de 256 x 64 pontos e todos os parâmetros aferidos podem ser transmitidos a um computador por meio de uma interface serial RS-232. A avaliação das incertezas de medição do analisador foi realizada de acordo com documentos normativos e os resultados obtidos mostraram-se adequados às exigências de precisão determinadas pela Norma ANSI/AAMI: DF2, tendo apresentado uma incerteza expandida relativa para as medições de energia igual a 1,03% no pior caso. Os resultados obtidos para a capacidade do procedimento de calibração mostrou-se adequado para as especificações de um analisador de desfibriladores e cardioversores, tendo obtido como resultado, no pior caso, um índice de capacidade Cm igual a 2,82, que é bem superior a 1,0, limite mínimo para que o procedimento seja considerado capaz. Uma comparação do desempenho de outros seis analisadores com a especificação tida como minimamente desejada também foi realizada e demonstrou diversas deficiências desses analisadores. Uma comparação do desempenho de outros seis analisadores com a especificação tida como minimamente desejada também foi realizada e demonstrou diversas deficiências desses analisadores. / The electrical defibrillation and cardioversion are the standard therapeutic procedures for treatment of ventricular fibrillation and ventricular tachycardia arrhythmias, respectively. The effective and secure operation of defibrillators and cardioverter require preventive and corrective maintenance. Therefore, its necessary a frequent evaluation of the performance of these devices. This evaluation must include measuring the energy, peak voltage, peak currents and response time to synchronized discharge, and is usually done by devices called defibrillator and cardioverter analyzer. In order for a defibrillator analyzer to be capable to perform the tests required by relevant Standards, it must be in compliance with several conditions, therefore, it is necessary the determination of a minimum specification that is desirable for a defibrillator and cardioverter analyzer. This paper describes the development of a defibrillators and cardioverters analyzer that is easy to use and is capable of measuring the delivered energy to a 50W resistance, simulating the transthoracic impedance, and also the peak voltage and peak current, positive and negative. The analyzer also includes an ECG simulator which allows the performance of tests to measure the response time to synchronized discharge of a cardioverter. An evaluation of the rhythm recognition detector of automated external defibrillators can also be performed through the simulation of arrhythmias whether or not passives of defibrillation. The waveform of the pulse is presented in a LCD display of 256x 64 pixels and all parameters measured can be transmitted to a computer through a serial interface RS-232. The evaluation of the analyzer uncertainty in measurement was performed according to the prescriptions of normative documents and the results were in accordance with the accuracy prescriptions of the ANSI/AAMI: DF2 Standard, presenting an expanded relative uncertainty for the energy measurements equal to 1,03% for worst case. The results obtained for the capacity of the calibration process are appropriate for the specifications of a defibrillator and cardioverter analyzer, resulting, in the worst case, in an index of capacity Cm equal to 2,82, well above 1,0, the minimum value required to consider the procedure capable. A comparison of the performance of other six analyzers with the minimum specification that is desirable was also done and it demonstrated several deficiencies s with the analyzers.
22

Analisador de desfibriladores e cardioversores. / Defibrillator and cardioverter analyzer.

Oliveira, Conrado Almeida de 21 December 2009 (has links)
A desfibrilação e a cardioversão elétricas são os procedimentos terapêuticos padrões para o tratamento, respectivamente, das arritmias de fibrilação e taquicardia ventricular. O funcionamento eficaz e seguro de desfibriladores e cardioversores requer uma manutenção preventiva e corretiva sendo, portanto, necessária uma avaliação freqüente do desempenho destes equipamentos. Esta avaliação deve incluir a medição das energias e das tensões e correntes de pico além do tempo de sincronismo para o caso de cardioversores, sendo normalmente realizada por dispositivos denominados analisador de desfibriladores e cardioversores. Para que um analisador de desfibriladores e cardioversores esteja apto a realizar os ensaios prescritos pelas Normas pertinentes, ele deve atender a varias condições, portanto, é necessário a determinação de uma especificação tida como minimamente desejável para um analisador de desfibriladores e cardioversores. Este trabalho descreve o desenvolvimento de um analisador de desfibriladores e cardioversores de fácil utilização e capaz de medir a energia entregue a uma resistência de 50 W, simulando a impedância transtorácica, além das tensões e correntes de pico, positiva e negativa. O analisador também engloba um simulador de ECG, com o qual também se pode realizar ensaios para a medição do tempo de sincronismo de um cardioversor. Uma avaliação do reconhecedor de ritmos de desfibriladores externos automáticos também pode ser realizada através da simulação de arritmias passíveis ou não de desfibrilação. A forma de onda do pulso desfibrilatório é apresentada em um display tipo LCD de 256 x 64 pontos e todos os parâmetros aferidos podem ser transmitidos a um computador por meio de uma interface serial RS-232. A avaliação das incertezas de medição do analisador foi realizada de acordo com documentos normativos e os resultados obtidos mostraram-se adequados às exigências de precisão determinadas pela Norma ANSI/AAMI: DF2, tendo apresentado uma incerteza expandida relativa para as medições de energia igual a 1,03% no pior caso. Os resultados obtidos para a capacidade do procedimento de calibração mostrou-se adequado para as especificações de um analisador de desfibriladores e cardioversores, tendo obtido como resultado, no pior caso, um índice de capacidade Cm igual a 2,82, que é bem superior a 1,0, limite mínimo para que o procedimento seja considerado capaz. Uma comparação do desempenho de outros seis analisadores com a especificação tida como minimamente desejada também foi realizada e demonstrou diversas deficiências desses analisadores. Uma comparação do desempenho de outros seis analisadores com a especificação tida como minimamente desejada também foi realizada e demonstrou diversas deficiências desses analisadores. / The electrical defibrillation and cardioversion are the standard therapeutic procedures for treatment of ventricular fibrillation and ventricular tachycardia arrhythmias, respectively. The effective and secure operation of defibrillators and cardioverter require preventive and corrective maintenance. Therefore, its necessary a frequent evaluation of the performance of these devices. This evaluation must include measuring the energy, peak voltage, peak currents and response time to synchronized discharge, and is usually done by devices called defibrillator and cardioverter analyzer. In order for a defibrillator analyzer to be capable to perform the tests required by relevant Standards, it must be in compliance with several conditions, therefore, it is necessary the determination of a minimum specification that is desirable for a defibrillator and cardioverter analyzer. This paper describes the development of a defibrillators and cardioverters analyzer that is easy to use and is capable of measuring the delivered energy to a 50W resistance, simulating the transthoracic impedance, and also the peak voltage and peak current, positive and negative. The analyzer also includes an ECG simulator which allows the performance of tests to measure the response time to synchronized discharge of a cardioverter. An evaluation of the rhythm recognition detector of automated external defibrillators can also be performed through the simulation of arrhythmias whether or not passives of defibrillation. The waveform of the pulse is presented in a LCD display of 256x 64 pixels and all parameters measured can be transmitted to a computer through a serial interface RS-232. The evaluation of the analyzer uncertainty in measurement was performed according to the prescriptions of normative documents and the results were in accordance with the accuracy prescriptions of the ANSI/AAMI: DF2 Standard, presenting an expanded relative uncertainty for the energy measurements equal to 1,03% for worst case. The results obtained for the capacity of the calibration process are appropriate for the specifications of a defibrillator and cardioverter analyzer, resulting, in the worst case, in an index of capacity Cm equal to 2,82, well above 1,0, the minimum value required to consider the procedure capable. A comparison of the performance of other six analyzers with the minimum specification that is desirable was also done and it demonstrated several deficiencies s with the analyzers.
23

Development of high performance implantable cardioverter defibrillator based statistical analysis of electrocardiography

Kwan, Siu-ki. January 2007 (has links)
Thesis (Ph. D.)--University of Hong Kong, 2007. / Title proper from title frame. Also available in printed format.
24

Depression and illness intrusiveness as predictors of quality of life among implantable atrioverter defibrillator recipients

Sotile, Rebecca Owen, January 2003 (has links)
Thesis (M.S.)--University of Florida, 2003. / Title from title page of source document. Includes vita. Includes bibliographical references.
25

A study of internal defibrillation efficacy using finite element analysis a 3D isotropic finite element model of the myocardium electric fields /

Golshayan, Maryam. January 1900 (has links)
Thesis (M.Eng.). / Written for the Dept. of Electrical and Computer Engineering. Title from title page of PDF (viewed 2008/05/13). Includes bibliographical references.
26

Analysis of defibrillation efficacy and investigation of impedance cardiography with finite element models incorporating anisotropic myocardium /

Wang, Yanqun. January 1999 (has links)
Thesis (Ph. D.)--University of Washington, 1999. / Vita. Includes bibliographical references (leaves 109-117).
27

Finite element modeling of ICD lead silicone soft-tips a thesis /

Lepe, Jose Jesus. Griffin, Lanny V., January 1900 (has links)
Thesis (M.S.)--California Polytechnic State University, 2010. / Title from PDF title page; viewed on May 26, 2010. Major professor: Lanny Griffin, Ph.D. "Presented to the faculty of California Polytechnic State University, San Luis Obispo." "In partial fulfillment of the requirements for the degree [of] Master of Science in Engineering, with a Specialization in Biomedical Engineering." " 2010." Includes bibliographical references (p. ).
28

Interactions between trains of premature stimuli and anatomically anchored reentrant wavefronts implications for antitachycardia pacing /

Byrd, Israel A. January 2006 (has links) (PDF)
Thesis (Ph. D.)--University of Alabama at Birmingham, 2006. / Description based on information viewed Oct. 3, 2006; title from title screen. Includes bibliographical references (p. 87-90).
29

The Availability of Automated External Defibrillators in Senior Residential Areas

McCrory, Mark L. January 2008 (has links)
Class of 2008 / Objectives: To determine the number of senior communities within the Tucson area that have access to automated external defibrillators (AED). Methods: Publicly available internet search engines were used to identify a number of various senior communities within the Tucson area. The various communities included senior apartment communities, recreational vehicle parks, and manufactured home parks. A representative employee of the community was interviewed to determine if an AED was accessible to the residents of the community. Results: Thirty senior apartments, eight manufactured home, and twelve RV communities were identified. The communities ranged in size from 22 to 1576 units, with the average being 222 units per community and the mean 232 units per community. IF the 50 senior communities identified only 2 of them had an AED on the premises. Both of the communities that had an AED on premise were RV parks that had a paid security crew that was trained in the use of the AED. Conclusions: In the Tucson senior communities there is a gross under availability of access to life saving equipment in a population that has a higher risk heart attacks and could benefit from having access to an AED.
30

The Experiences of Younger Adults (18-40 Years) Living with an Implanted Cardioverter Defibrillator (ICD): A Dissertation

McDonough, Annette 01 May 2007 (has links)
Sudden cardiac death (SCD) is responsible for 300,000 deaths in the United States each year. Of these 300,000 deaths, 3,000-5,000 are younger adults (18-40 years) (American Heart Association (AHA), 2005; Sudden Arrhythmia Death Syndromes Foundation (SADS), 2005). Implanted cardioverter defibrillators have become the treatment of choice for individuals with life threatening arrhythmias (Cannom Prystowsky, 2004; Glikson & Friedman, 2001; Josephson, Hein, & Wellens, 2004). Although this life sustaining technology has been found to be effective in terminating life threatening arrhythmias, adjustment to an ICD may be difficult for some patients (Ganz, 2004). Few studies have investigated how younger adults manage life with an ICD (Sears, Burns, Handberg, Sotile, & Conti, 2001). It has been reported that older adults view the ICD as an extension of life, whereas, younger ICD recipients associate the ICD with significant life changes, body image concerns, and decreased independence (Arteaga & Windle, 1995). The purpose of this study was to describe the day-to-day experiences of younger adults (18-40 years old) [N = 20] living with an implanted cardioverter defibrillator. A qualitative descriptive design was used with naturalistic inquiry guiding data collection, management, and analysis. Using open-ended, in-depth interviews, younger adults were asked to describe their life after ICD implantation, physiological or psychosocial issues related to ICD implantation, and strategies used to manage life with an ICD. Data were managed using NVIVO software and analyzed using content analysis. The results revealed an overarching theme, A cautious transition to a new normal, with five subthemes: Initial diagnosis: anxiety and concern; Caution, awareness, and security: daily life with an ICD; Childbearing: passing my disease to my children; Financial concerns; and Strategies for living with an ICD: be positive and live life to the fullest. This study presented some of the unique developmental and transitional issues that younger adults with ICDs are facing and strategies they used to assist in adaptation to life with an ICD. Their experiences can provide the basis for intervention programs that are developmentally sensitive and age-specific.

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