Classificação de arritmias utilizando variações de tensão do electrocardiograma
Ano de defesa: | 2018 |
---|---|
Autor(a) principal: | |
Orientador(a): | |
Banca de defesa: | , , , , |
Tipo de documento: | Tese |
Tipo de acesso: | Acesso aberto |
Idioma: | por |
Instituição de defesa: |
Universidade Federal do Maranhão
|
Programa de Pós-Graduação: |
PROGRAMA DE PÓS-GRADUAÇÃO EM ENGENHARIA DE ELETRICIDADE/CCET
|
Departamento: |
DEPARTAMENTO DE ENGENHARIA DA ELETRICIDADE/CCET
|
País: |
Brasil
|
Palavras-chave em Português: | |
Palavras-chave em Inglês: | |
Área do conhecimento CNPq: | |
Link de acesso: | https://tedebc.ufma.br/jspui/handle/tede/tede/2503 |
Resumo: | Abstract Based on the electrocardiogram (ECG), several authors use the R-R interval, to propose support systems for the diagnosis of arrhythmias. However, R-R interval analysis does not measure alterations in the amplitude of waves, and also does not detect the absence of the P-wave caused by atrial fibrillation. In this context, we proposed a method capable of measuring the amplitude of ECG waves. In this study we proposed to investigate the voltage variation occurring at each heartbeat interval using statistical moments. Unlike the R-R interval in which each heartbeat is associated with a single real number, the proposed method associates each heartbeat to a set of points, that is, a vector. The heartbeats were obtained from the following databases: MIT-BIH Normal Sinus Rhythm, MIT-BIH Atrial Fibrillation (AF), and MIT-BIH Arrhythmia, and the classifiers used to evaluate the proposed method were linear discriminant analysis, k-nearest neighbors, and support vector machine. The experiments were conducted using 80% of the patients for training (16 healthy patients, 41 patients with arrhythmia and 20 patients with AF) and 20% of the patients for testing (2 healthy patients, 6 patients with arrhythmia and 3 patients with AF). ECG window is eficient in healthy heartbeat (100% average accuracy) in all evaluated cases (heartbeat, P-wave, QRS complex, T-wave, PQ segment). In addition, the proposed method proved to be eficient in solving General (accuracy is up to 99.78% in the arrhythmia classification) and specific (accuracy of 100% in the AF classification) heartbeat problems. The results obtained by the proposed method can be used to support decision-making in clinical practice and also detect arrhythmia autonomously without the need for a medical report, as a kind of automatic alert and thus inform the patient and the health team about the abnormality found. |
id |
UFMA_26577a3b06a611628b611f38484d9bf8 |
---|---|
oai_identifier_str |
oai:tede2:tede/2503 |
network_acronym_str |
UFMA |
network_name_str |
Biblioteca Digital de Teses e Dissertações da UFMA |
repository_id_str |
|
spelling |
BARROS FILHO, Allan Kardec Duailibe340225893-53http://lattes.cnpq.br/0492330410079141BARROS FILHO, Allan Kardec Duailibe340225893-53http://lattes.cnpq.br/0492330410079141SANTANA, Ewaldo Eder Carvalhohttp://lattes.cnpq.br/0660692009750374SOUZA, Francisco das Chagas dehttp://lattes.cnpq.br/2405363087479257YEHIA, Hani Camillehttp://lattes.cnpq.br/5816909391153518CARVALHO FILHO, Antonio Oseas dehttp://lattes.cnpq.br/7913655222849728008952993-64http://lattes.cnpq.br/7145102625820184QUIEROZ, Jonathan Araujo2019-02-07T17:42:47Z2018-12-10QUIEROZ, Jonathan Araujo. Classificação de arritmias utilizando variações de tensão do electrocardiograma. 2018. 68 f. Tese (Programa de Pós-Graduação em Engenharia de Eletricidade/CCET) - Universidade Federal do Maranhão, São Luís .https://tedebc.ufma.br/jspui/handle/tede/tede/2503Abstract Based on the electrocardiogram (ECG), several authors use the R-R interval, to propose support systems for the diagnosis of arrhythmias. However, R-R interval analysis does not measure alterations in the amplitude of waves, and also does not detect the absence of the P-wave caused by atrial fibrillation. In this context, we proposed a method capable of measuring the amplitude of ECG waves. In this study we proposed to investigate the voltage variation occurring at each heartbeat interval using statistical moments. Unlike the R-R interval in which each heartbeat is associated with a single real number, the proposed method associates each heartbeat to a set of points, that is, a vector. The heartbeats were obtained from the following databases: MIT-BIH Normal Sinus Rhythm, MIT-BIH Atrial Fibrillation (AF), and MIT-BIH Arrhythmia, and the classifiers used to evaluate the proposed method were linear discriminant analysis, k-nearest neighbors, and support vector machine. The experiments were conducted using 80% of the patients for training (16 healthy patients, 41 patients with arrhythmia and 20 patients with AF) and 20% of the patients for testing (2 healthy patients, 6 patients with arrhythmia and 3 patients with AF). ECG window is eficient in healthy heartbeat (100% average accuracy) in all evaluated cases (heartbeat, P-wave, QRS complex, T-wave, PQ segment). In addition, the proposed method proved to be eficient in solving General (accuracy is up to 99.78% in the arrhythmia classification) and specific (accuracy of 100% in the AF classification) heartbeat problems. The results obtained by the proposed method can be used to support decision-making in clinical practice and also detect arrhythmia autonomously without the need for a medical report, as a kind of automatic alert and thus inform the patient and the health team about the abnormality found.Com base no eletrocardiograma (ECG), vários autores utilizam o intervalo R-R para propor sistemas de suporte para o diagnóstico de arritmias. Entretanto, a análise do intervalo R-R não mede alterações na amplitude das ondas e também não detecta a ausência da onda P causada por doenças nos átrios como a fibrilação atrial. Neste contexto, propusemos um método capaz de medir a amplitude das ondas de ECG, utilizando janelas deslizantes. Neste estudo, investigamos a variação da tensão ocorrida em cada ciclo cardíaco usando momentos estatísticos. Ao contrário do intervalo R-R, no qual cada ciclo cardíaco está associado a um único número real, o método proposto associa cada ciclo cardíaco a um conjunto de pontos, isto _e, um vetor. Os ciclos cardíacos foram obtidos nos seguintes bancos de dados: Ritmo Sinusal Normal MIT-BIH, Fibrilação Atrial (FA) MIT-BIH e Arritmia MIT-BIH, e os classificadores utilizados para avaliar o método proposto foram análise discriminante linear, k-vizinhos mais próximos e máquina de vetores suporte. Os experimentos foram realizados utilizando 88% dos pacientes para treinamento (16 pacientes saudáveis, 41 pacientes com arritmia e 20 pacientes com FA) e 12% dos pacientes para o teste (2 pacientes saudáveis, 6 pacientes com arritmia e 3 pacientes com FA). O método de janelamento para o sinal de ECG foi eficiente em ciclos cardíacos saudáveis (100% de acurária média) em todos os casos avaliados (ciclo cardíaco, onda S, complexo QRS, onda T, segmento PQ). Além disso, o método proposto mostrou-se eficiente na resolução de problemas gerais (acurácia de até 99,78% na classificação de arritmias) e específicos (acurácia de 100% na classificacão de FA). Os resultados obtidos pelo método proposto podem ser utilizados para subsidiar a tomada de decisão na prática clínica e também detectar arritmias autonomamente sem a necessidade de laudo médico, como uma espécie de alerta automático e, assim, informar o paciente e a equipe de saúde sobre a anormalidade encontrada.Submitted by Daniella Santos (daniella.santos@ufma.br) on 2019-02-07T17:42:47Z No. of bitstreams: 1 JonathanQueiroz.pdf: 3899536 bytes, checksum: adb77455d4589105fd428973daae5444 (MD5)Made available in DSpace on 2019-02-07T17:42:47Z (GMT). No. of bitstreams: 1 JonathanQueiroz.pdf: 3899536 bytes, checksum: adb77455d4589105fd428973daae5444 (MD5) Previous issue date: 2018-12-10application/pdfporUniversidade Federal do MaranhãoPROGRAMA DE PÓS-GRADUAÇÃO EM ENGENHARIA DE ELETRICIDADE/CCETUFMABrasilDEPARTAMENTO DE ENGENHARIA DA ELETRICIDADE/CCETCiclo cardíacoIntervalo R-RMorfologia do ECGEstatística de alta ordemHeartbeatR-R intervalMorphological informationStatistical momentsAtrial fibrillationEngenharia ElétricaClassificação de arritmias utilizando variações de tensão do electrocardiogramaClassification of arrhythmias using electrocardiogram voltage variationsinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/doctoralThesisinfo:eu-repo/semantics/openAccessreponame:Biblioteca Digital de Teses e Dissertações da UFMAinstname:Universidade Federal do Maranhão (UFMA)instacron:UFMAORIGINALJonathanQueiroz.pdfJonathanQueiroz.pdfapplication/pdf3899536http://tedebc.ufma.br:8080/bitstream/tede/2503/2/JonathanQueiroz.pdfadb77455d4589105fd428973daae5444MD52LICENSElicense.txtlicense.txttext/plain; charset=utf-82255http://tedebc.ufma.br:8080/bitstream/tede/2503/1/license.txt97eeade1fce43278e63fe063657f8083MD51tede/25032019-02-07 14:42:47.105oai:tede2: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Biblioteca Digital de Teses e Dissertaçõeshttps://tedebc.ufma.br/jspui/PUBhttp://tedebc.ufma.br:8080/oai/requestrepositorio@ufma.br||repositorio@ufma.bropendoar:21312019-02-07T17:42:47Biblioteca Digital de Teses e Dissertações da UFMA - Universidade Federal do Maranhão (UFMA)false |
dc.title.por.fl_str_mv |
Classificação de arritmias utilizando variações de tensão do electrocardiograma |
dc.title.alternative.eng.fl_str_mv |
Classification of arrhythmias using electrocardiogram voltage variations |
title |
Classificação de arritmias utilizando variações de tensão do electrocardiograma |
spellingShingle |
Classificação de arritmias utilizando variações de tensão do electrocardiograma QUIEROZ, Jonathan Araujo Ciclo cardíaco Intervalo R-R Morfologia do ECG Estatística de alta ordem Heartbeat R-R interval Morphological information Statistical moments Atrial fibrillation Engenharia Elétrica |
title_short |
Classificação de arritmias utilizando variações de tensão do electrocardiograma |
title_full |
Classificação de arritmias utilizando variações de tensão do electrocardiograma |
title_fullStr |
Classificação de arritmias utilizando variações de tensão do electrocardiograma |
title_full_unstemmed |
Classificação de arritmias utilizando variações de tensão do electrocardiograma |
title_sort |
Classificação de arritmias utilizando variações de tensão do electrocardiograma |
author |
QUIEROZ, Jonathan Araujo |
author_facet |
QUIEROZ, Jonathan Araujo |
author_role |
author |
dc.contributor.advisor1.fl_str_mv |
BARROS FILHO, Allan Kardec Duailibe |
dc.contributor.advisor1ID.fl_str_mv |
340225893-53 |
dc.contributor.advisor1Lattes.fl_str_mv |
http://lattes.cnpq.br/0492330410079141 |
dc.contributor.referee1.fl_str_mv |
BARROS FILHO, Allan Kardec Duailibe |
dc.contributor.referee1ID.fl_str_mv |
340225893-53 |
dc.contributor.referee1Lattes.fl_str_mv |
http://lattes.cnpq.br/0492330410079141 |
dc.contributor.referee2.fl_str_mv |
SANTANA, Ewaldo Eder Carvalho |
dc.contributor.referee2Lattes.fl_str_mv |
http://lattes.cnpq.br/0660692009750374 |
dc.contributor.referee3.fl_str_mv |
SOUZA, Francisco das Chagas de |
dc.contributor.referee3Lattes.fl_str_mv |
http://lattes.cnpq.br/2405363087479257 |
dc.contributor.referee4.fl_str_mv |
YEHIA, Hani Camille |
dc.contributor.referee4Lattes.fl_str_mv |
http://lattes.cnpq.br/5816909391153518 |
dc.contributor.referee5.fl_str_mv |
CARVALHO FILHO, Antonio Oseas de |
dc.contributor.referee5Lattes.fl_str_mv |
http://lattes.cnpq.br/7913655222849728 |
dc.contributor.authorID.fl_str_mv |
008952993-64 |
dc.contributor.authorLattes.fl_str_mv |
http://lattes.cnpq.br/7145102625820184 |
dc.contributor.author.fl_str_mv |
QUIEROZ, Jonathan Araujo |
contributor_str_mv |
BARROS FILHO, Allan Kardec Duailibe BARROS FILHO, Allan Kardec Duailibe SANTANA, Ewaldo Eder Carvalho SOUZA, Francisco das Chagas de YEHIA, Hani Camille CARVALHO FILHO, Antonio Oseas de |
dc.subject.por.fl_str_mv |
Ciclo cardíaco Intervalo R-R Morfologia do ECG Estatística de alta ordem |
topic |
Ciclo cardíaco Intervalo R-R Morfologia do ECG Estatística de alta ordem Heartbeat R-R interval Morphological information Statistical moments Atrial fibrillation Engenharia Elétrica |
dc.subject.eng.fl_str_mv |
Heartbeat R-R interval Morphological information Statistical moments Atrial fibrillation |
dc.subject.cnpq.fl_str_mv |
Engenharia Elétrica |
description |
Abstract Based on the electrocardiogram (ECG), several authors use the R-R interval, to propose support systems for the diagnosis of arrhythmias. However, R-R interval analysis does not measure alterations in the amplitude of waves, and also does not detect the absence of the P-wave caused by atrial fibrillation. In this context, we proposed a method capable of measuring the amplitude of ECG waves. In this study we proposed to investigate the voltage variation occurring at each heartbeat interval using statistical moments. Unlike the R-R interval in which each heartbeat is associated with a single real number, the proposed method associates each heartbeat to a set of points, that is, a vector. The heartbeats were obtained from the following databases: MIT-BIH Normal Sinus Rhythm, MIT-BIH Atrial Fibrillation (AF), and MIT-BIH Arrhythmia, and the classifiers used to evaluate the proposed method were linear discriminant analysis, k-nearest neighbors, and support vector machine. The experiments were conducted using 80% of the patients for training (16 healthy patients, 41 patients with arrhythmia and 20 patients with AF) and 20% of the patients for testing (2 healthy patients, 6 patients with arrhythmia and 3 patients with AF). ECG window is eficient in healthy heartbeat (100% average accuracy) in all evaluated cases (heartbeat, P-wave, QRS complex, T-wave, PQ segment). In addition, the proposed method proved to be eficient in solving General (accuracy is up to 99.78% in the arrhythmia classification) and specific (accuracy of 100% in the AF classification) heartbeat problems. The results obtained by the proposed method can be used to support decision-making in clinical practice and also detect arrhythmia autonomously without the need for a medical report, as a kind of automatic alert and thus inform the patient and the health team about the abnormality found. |
publishDate |
2018 |
dc.date.issued.fl_str_mv |
2018-12-10 |
dc.date.accessioned.fl_str_mv |
2019-02-07T17:42:47Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/doctoralThesis |
format |
doctoralThesis |
status_str |
publishedVersion |
dc.identifier.citation.fl_str_mv |
QUIEROZ, Jonathan Araujo. Classificação de arritmias utilizando variações de tensão do electrocardiograma. 2018. 68 f. Tese (Programa de Pós-Graduação em Engenharia de Eletricidade/CCET) - Universidade Federal do Maranhão, São Luís . |
dc.identifier.uri.fl_str_mv |
https://tedebc.ufma.br/jspui/handle/tede/tede/2503 |
identifier_str_mv |
QUIEROZ, Jonathan Araujo. Classificação de arritmias utilizando variações de tensão do electrocardiograma. 2018. 68 f. Tese (Programa de Pós-Graduação em Engenharia de Eletricidade/CCET) - Universidade Federal do Maranhão, São Luís . |
url |
https://tedebc.ufma.br/jspui/handle/tede/tede/2503 |
dc.language.iso.fl_str_mv |
por |
language |
por |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Universidade Federal do Maranhão |
dc.publisher.program.fl_str_mv |
PROGRAMA DE PÓS-GRADUAÇÃO EM ENGENHARIA DE ELETRICIDADE/CCET |
dc.publisher.initials.fl_str_mv |
UFMA |
dc.publisher.country.fl_str_mv |
Brasil |
dc.publisher.department.fl_str_mv |
DEPARTAMENTO DE ENGENHARIA DA ELETRICIDADE/CCET |
publisher.none.fl_str_mv |
Universidade Federal do Maranhão |
dc.source.none.fl_str_mv |
reponame:Biblioteca Digital de Teses e Dissertações da UFMA instname:Universidade Federal do Maranhão (UFMA) instacron:UFMA |
instname_str |
Universidade Federal do Maranhão (UFMA) |
instacron_str |
UFMA |
institution |
UFMA |
reponame_str |
Biblioteca Digital de Teses e Dissertações da UFMA |
collection |
Biblioteca Digital de Teses e Dissertações da UFMA |
bitstream.url.fl_str_mv |
http://tedebc.ufma.br:8080/bitstream/tede/2503/2/JonathanQueiroz.pdf http://tedebc.ufma.br:8080/bitstream/tede/2503/1/license.txt |
bitstream.checksum.fl_str_mv |
adb77455d4589105fd428973daae5444 97eeade1fce43278e63fe063657f8083 |
bitstream.checksumAlgorithm.fl_str_mv |
MD5 MD5 |
repository.name.fl_str_mv |
Biblioteca Digital de Teses e Dissertações da UFMA - Universidade Federal do Maranhão (UFMA) |
repository.mail.fl_str_mv |
repositorio@ufma.br||repositorio@ufma.br |
_version_ |
1797055611110686720 |