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‣ Estudo do eletrocardiograma ambulatorial, eletrocardiograma de alta resolução (ECGAR) e variabilidade da frequência cardíaca como indicadores prognósticos na cardiomiopatia arritmogênica de cães Boxer; Study of ambulatory electrocardiography, signal-averaged electrocardiogram and heart rate variability as prognostic factors in Boxer dogs with arrhythmogenic cardiomyopathy

Chamas, Patrícia Pereira Costa
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Tese de Doutorado Formato: application/pdf
Publicado em 31/01/2011 Português
Relevância na Pesquisa
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A cardiomiopatia arritmogênica do ventrículo direito (CAVD) é uma doença miocárdica genética e hereditária, com alta prevalência entre os cães da raça Boxer, causada por alterações nos genes que codificam os receptores de rianodina ou os desmossomos cardíacos. Caracteriza-se, histologicamente, por atrofia de miócitos do ventrículo direito, principalmente, com reposição por tecido adiposo e fibroso. Tais lesões causam instabilidade elétrica do miocárdio, com consequente aparecimento de arritmias ventriculares por re-entrada. Os animais afetados podem apresentar-se assintomáticos ou com frequentes episódios de síncope ou morte súbita; ainda, podem desenvolver uma forma mais grave da doença, com dilatação ventricular e disfunção sistólica, evoluindo para insuficiência cardíaca congestiva. Devido à escassez de estudos determinando fatores preditivos para a ocorrência de morte de origem cardíaca nestes animais, o presente estudo objetivou avaliar o valor prognóstico das variáveis de eletrocardiografia ambulatorial (Holter), eletrocardiografia de alta resolução (ECGAR) e variabilidade de frequência cardíaca (VFC) na CAVD do Boxer. Para tanto, tais parâmetros foram avaliados em 92 cães, distribuídos de acordo com a raça ou o estágio da doença em cinco grupos: cãescontrole da raça Pastor Alemão (grupo PA)...

‣ High-resolution electrocardiography in dogs under doxorubicin-induced cardiomyopathy

Ferreira, W. L.; Sousa, R. C. A.; Camacho, Aparecido Antonio
Fonte: Universidade Federal de Minas Gerais (UFMG), Escola de Veterinária Publicador: Universidade Federal de Minas Gerais (UFMG), Escola de Veterinária
Tipo: Artigo de Revista Científica Formato: 1118-1122
Português
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Determinaram-se a ocorrência de potencial tardio em cães com cardiomiopatia induzida pela doxorrubicina e sua relação com o desenvolvimento de arritmias ventriculares ou morte súbita. Sete cães adultos, sem raça definida, de ambos os sexos foram utilizados. A cardiomiopatia foi induzida por infusão venosa lenta de doxorrubicina (30mg/m²) em intervalos de 21 dias, até uma dose total cumulativa de 240mg/m². Os animais foram monitorados ecocardiograficamente. Após a confirmação da cardiomiopatia, foi feito o registro da eletrocardiografia de alta resolução. Potenciais tardios foram observados em dois animais que morreram subitamente poucos dias após.; The occurrence of late potentials in dogs under doxorubicin-induced cardiomyopathy and their relationship with the development of ventricular arrhythmias or sudden death were studied. Seven adult mongrel dogs of both sexes were used. Cardiomyopathy was induced by slow intravenous infusion of doxorubicin (30mg/m²) at 21-day intervals, until a total cumulative dose of 240mg/m² was reached. Animals were monitored by echocardiography. After the induction of cardiomyopathy, high-resolution electrocardiography was recorded. Late potentials were observed in two animals that suddenly died a few days later.

‣ High-resolution electrocardiography in the diagnosis of arrhythmogenic right ventricular cardiomyopathy in Boxer dogs

Pereira, Evandro Zacché; Assumpção, Thais Cristine Alves; Gering, Ana Paula; Gava, Fábio Nelson; Ortiz, Edna Mireya Gómez; Camacho, Aparecido Antonio
Fonte: Universidade Federal de Santa Maria (UFSM) Publicador: Universidade Federal de Santa Maria (UFSM)
Tipo: Artigo de Revista Científica Formato: 1102-1106
Português
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Com o objetivo de avaliar a importância da eletrocardiografia de alta resolução no diagnóstico da cardiomiopatia arritmogênica do ventrículo direito do Boxer, 20 cães sem evidências de doença cardíaca estrutural à avaliação ecodopplercardiográfica foram agrupados de acordo com a frequência de arritmias ventriculares, avaliadas pela eletrocardiografia ambulatorial de 24 horas, e submetidos ao exame eletrocardiográfico de alta resolução. Duração do complexo QRS filtrado, duração dos sinais de baixa amplitude (menor que 40µV) dos últimos 40 milissegundos do complexo QRS e raiz quadrada média da voltagem ao quadrado dos últimos 40 milissegundos do complexo QRS (RMS40) foram as variáveis avaliadas. Não foram observadas diferenças significativas entre os grupos em relação às variáveis estudadas. Sendo assim, os resultados do presente estudo sugerem que a eletrocardiografia de alta resolução não é uma ferramenta útil no auxílio diagnóstico da cardiomiopatia arritmogênica do ventrículo direito dos cães da raça Boxer que não apresentam alterações miocárdicas evidentes ou disfunção sistólica.; To evaluate the reliability of high-resolution electrocardiography in the diagnosis of arrhythmogenic right ventricular cardiomyopathy in Boxers...

‣ Atrial activation during sinus rhythm in patients with rheumatic and non-rheumatic paroxysmal atrial fibrillation. Frequency-domain analysis using signal-averaged electrocardiography

Dantas,Rogério Carregoza; Barbosa,Eduardo Corrêa; Benchimol-Barbosa,P. R.; Bomfim,Alfredo de Souza; Ginefra,Paulo
Fonte: Sociedade Brasileira de Cardiologia - SBC Publicador: Sociedade Brasileira de Cardiologia - SBC
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/11/2001 Português
Relevância na Pesquisa
37.21232%
OBJECTIVE: Using P-wave signal-averaged electrocardiography, we assessed the patterns of atrial electrical activation in patients with idiopathic atrial fibrillation as compared with patterns in patients with atrial fibrillation associated with structural heart disease. METHODS: Eighty patients with recurrent paroxysmal atrial fibrillation were divided into 3 groups as follows: group I - 40 patients with atrial fibrillation associated with non-rheumatic heart disease; group II - 25 patients with rheumatic atrial fibrillation; and group III - 15 patients with idiopathic atrial fibrillation. All patients underwent P-wave signal-averaged electrocardiography for frequency-domain analysis using spectrotemporal mapping and statistical techniques for detecting and quantifying intraatrial conduction disturbances. RESULTS: We observed an important fragmentation in atrial electrical conduction in 27% of the patients in group I, 64% of the patients in group II, and 67% of the patients in group III (p=0.003). CONCLUSION: Idiopathic atrial fibrillation has important intraatrial conduction disturbances. These alterations are similar to those observed in individuals with rheumatic atrial fibrillation, suggesting the existence of some degree of structural involvement of the atrial myocardium that cannot be detected with conventional electrocardiography and echocardiography.

‣ High-resolution electrocardiography in dogs under doxorubicin-induced cardiomyopathy

Ferreira,W.L.; Sousa,R.C.A.; Camacho,A.A.
Fonte: Universidade Federal de Minas Gerais, Escola de Veterinária Publicador: Universidade Federal de Minas Gerais, Escola de Veterinária
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/10/2008 Português
Relevância na Pesquisa
36.959482%
The occurrence of late potentials in dogs under doxorubicin-induced cardiomyopathy and their relationship with the development of ventricular arrhythmias or sudden death were studied. Seven adult mongrel dogs of both sexes were used. Cardiomyopathy was induced by slow intravenous infusion of doxorubicin (30mg/m²) at 21-day intervals, until a total cumulative dose of 240mg/m² was reached. Animals were monitored by echocardiography. After the induction of cardiomyopathy, high-resolution electrocardiography was recorded. Late potentials were observed in two animals that suddenly died a few days later.

‣ High-resolution electrocardiography in the diagnosis of arrhythmogenic right ventricular cardiomyopathy in Boxer dogs

Pereira,Evandro Zacché; Assumpção,Thais Cristine Alves; Gering,Ana Paula; Gava,Fábio Nelson; Ortiz,Edna Mireya Gómez; Camacho,Aparecido Antonio
Fonte: Universidade Federal de Santa Maria Publicador: Universidade Federal de Santa Maria
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/06/2013 Português
Relevância na Pesquisa
27.110212%
To evaluate the reliability of high-resolution electrocardiography in the diagnosis of arrhythmogenic right ventricular cardiomyopathy in Boxers, 20 dogs with no structural cardiac alterations at echocardiographic examination were grouped on the basis of frequency of ventricular arrhythmias, evaluated by 24-hour ambulatory ECG, and undergoing a high-resolution electrocardiography. High frequency QRS duration, duration of terminal QRS complex less than 40µV (LAS40) and root mean square voltage of the terminal 40 milliseconds of the QRS complex (RMS40) were measured. Differences in high-resolution ECG variables were not observed between groups. Therefore, the results of this investigation suggest that high-resolution electrocardiography is not a useful method for the diagnosis of arrhythmogenic right ventricular cardiomyopathy in Boxers without detectable myocardial alterations or systolic dysfunction.

‣ Evaluation of exercise electrocardiography and thallium tomographic imaging in detecting asymptomatic coronary artery disease in diabetic patients.

Koistinen, M J; Huikuri, H V; Pirttiaho, H; Linnaluoto, M K; Takkunen, J T
Fonte: PubMed Publicador: PubMed
Tipo: Artigo de Revista Científica
Publicado em /01/1990 Português
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Thallium tomographic imaging and exercise electrocardiography were performed on 136 diabetic patients without symptoms of heart disease. Thirty three patients had post-exercise thallium defects and 19 had ST 1 mm greater than or equal to segment depression during exercise electrocardiography. Both tests were positive in 13 patients. Coronary angiography was subsequently performed on 33 patients with either scintigraphic and/or electrocardiographic evidence of myocardial ischaemia. Angiographically significant coronary artery disease (greater than or equal to 50% narrowing of the coronary artery lumen) was detected in 13 patients. Six patients had minimal coronary artery stenosis (less than 50%), and 14 had normal coronary arteries. Six patients refused cardiac catheterisation. In 14 out of 27 patients with post-exercise thallium defects coronary angiography did not show any coronary artery stenoses (positive predictive accuracy 48%). Exercise electrocardiography showed only one false positive result (positive predictive accuracy 94%) but failed to detect coronary artery disease in three patients with a positive scintigraphic result. The accuracy of a positive exercise electrocardiographic test seems to be better than that of a positive thallium tomographic scan for detecting asymptomatic coronary artery disease in diabetic patients. The high number of false positive thallium defects may be the result of technical features inherent in thallium tomography and/or the possible disease of the small intramyocardial arteries in diabetic patients.

‣ Open access exercise electrocardiography: a service to improve management of ischaemic heart disease by general practitioners.

Sulke, A N; Paul, V E; Taylor, C J; Roberts, R H; Norris, A D
Fonte: PubMed Publicador: PubMed
Tipo: Artigo de Revista Científica
Publicado em /10/1991 Português
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An initial study of the use of open access exercise electrocardiography by general practitioners (GPs) in South East Kent showed that patient selection and interpretation of test results was frequently incorrect. After issuing guidelines, modifying the request form and instituting registrar review of all requests, significant improvements in both referral pattern, result interpretation and patient management have resulted. Forty-nine GPs requested 110 exercise tests during 1988/89. Twelve per cent were not undertaken after discussion with the referring practitioner. Eighty-four per cent of those tested would have been referred to the district general hospital cardiology outpatient department in the absence of open access exercise electrocardiography service. Six per cent of patients were referred directly for invasive investigation. Thirty-five per cent were referred to the district general hospital cardiology outpatient department, whilst 42% were spared hospital referral based on the result of the investigation. Better use of the modified service was suggested by: referral of fewer patients with non-cardiac chest pains (P = 0.002); more patients with a moderate pre-test probability of ischaemic heart disease (P less than 0.05); fewer inappropriate requests (P less than 0.01); and fewer inappropriately undertaken tests (P less than 0.001) than in the previous study. All patients with strongly positive test results were appropriately managed. Open access exercise electrocardiography in the format investigated is potentially a cost-effective and useful tool to improve diagnosis and management of heart disease by GPs.

‣ Preoperative electrocardiography: its cost-effectiveness in detecting abnormalities when a previous tracing exists.

Rabkin, S W; Horne, J M
Fonte: PubMed Publicador: PubMed
Tipo: Artigo de Revista Científica
Publicado em 04/08/1979 Português
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In 812 patients who underwent routine preoperative electrocardiography a mean of 24.6 months after undergoing electrocardiography at the same institution, the frequency of new abnormalities was estimated to evaluate the cost-effectiveness of this procedure prior to an operation. New abnormalities were judged to be either relevant or irrelevant to the assessment of operative risk, depending upon their previously demonstrated correlation with operative and postoperative morbidity and mortality. Since new abnormalities, especially new relevant abnormalities, were found to be relatively infrequent, the cost-effectiveness of routine preoperative electrocardiography was considered to be low. The evidence suggested that when a previous tracing exists preoperative electrocardiography is most clearly indicated for patients who are 60 years of age or older or whose previous tracing exhibited abnormalities. However, further research is required to develop more sensitive and specific protocols, and to evaluate the role of repeat electrocardiography in clinical decision-making.

‣ Electrocardiography as a Tool for Validating Myocardial Ischemia–Reperfusion Procedures in Mice

Preda, Mihai B; Burlacu, Alexandrina
Fonte: American Association for Laboratory Animal Science Publicador: American Association for Laboratory Animal Science
Tipo: Artigo de Revista Científica
Português
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This paper evaluates the modifications induced by ischemia and ischemia–reperfusion in mice after permanent or transient, respectively, ligation of the left coronary artery and establishes a correlation among the extent of ischemia, electrocardiograph features, and infarct size. The left coronary artery was ligated 1 mm distal from the tip of the left auricle. Histologic analysis revealed that 30-min ischemia (n = 9) led to infarction involving 9.7% ± 0.5% of the left ventricle, whereas 1-h ischemia (n = 9) resulted in transmural infarction of 16.1% ± 4.6% of the left ventricle. In contrast, 24-h ischemia (n = 8) and permanent ischemia (n = 8) induced similarly sized infarcts (33% ± 2% and 31.8% ± 0.7%, respectively), suggesting ineffective reperfusion after 24-h ischemia. Electrocardiography revealed that ligation of the left coronary artery led to ST height elevation (204 compared with 14 μV) and QTc prolongation (136 compared with 76 ms). Both parameters rapidly normalized on reperfusion, demonstrating that electrocardiography was important for validating correct ligation and reperfusion. In addition, electrocardiography predicted the severity of the myocardial damage induced by ischemia. Our results show that electrocardiographic changes present after 30-min ischemia were reversed on reperfusion; however...

‣ Classification Techniques for Undersampled Electromyography and Electrocardiography

Wilhelm, Keith
Fonte: Universidade Rice Publicador: Universidade Rice
Português
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Electrophysiological signals including electrocardiography (ECG) and electromyography (EMG) are widely used in clinical environments for monitoring of patients and for diagnosis of conditions including cardiac and neuromuscular disease. Due to the wealth of information contained in these signals, many additional applications would be facilitated by full-time acquisition combined with automated analysis. Recent performance gains in portable computing devices and large scale computing platforms provide the necessary computational resources to process and store this data; however challenges at the sensor level have prevented monitoring systems from reaching the practicality and convenience necessary for widespread, continuous use. In this thesis, we examine the feasibility of applying techniques from the compressive sensing field to the acquisition and analysis of electrophysiological signals. These techniques allow signals to be acquired in compressed form, thereby providing a means to reduce power consumption of monitoring devices. We demonstrate the effects of several methods of compressive sampling and reconstruction on standard compression and reconstruction error metrics. Additionally, we investigate the effects of compressive sensing on the accuracy of automated signal analysis techniques for extracting useful information from ECG and EMG signals.

‣ Comprobación del catéter venoso central por registro electrocardiográfico.; Checking of the central venous catheter by electrocardiography

Zarandona del Campo, A.; Santos Pinedo, E.
Fonte: Murcia : Servicio de Publicaciones de la Universidad de Murcia Publicador: Murcia : Servicio de Publicaciones de la Universidad de Murcia
Tipo: Artigo de Revista Científica Formato: application/pdf
Português
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La canalización de vías venosas centrales de acceso periférico es una técnica bastante habitual entre los profesionales de enfermería, sobre todo en Unidades de Cuidados Intensivos y en determinados servicios de hospitalización, en los que la presencia de una vía venosa central se hace indispensable tanto para la administración de nutrición parenteral o de determinados medicamentos, como para la obtención de un parámetro que oriente sobre la volemia y el rendimiento cardíaco a través de la presión venosa central. Tradicionalmente, la comprobación de la correcta ubicación del catéter venoso central se ha venido realizando a través de métodos radiológicos, pero existe otra técnica de comprobación basada en el registro electrocardiográfico intracavitario, cuyo conocimiento puede aportar beneficios tanto al personal de enfermería como al propio paciente.; ABSTRACT Canalization of central veins of peripheral access is a common procedure performed by nurses and, above all, by those working at Intensive Care Units and some others hospital units in which it is necessary the presence of a central venous path for either parenteral nutrition/administration of medication or obtaining a parameter which informs about volemy and cardiac performance via central venous pressure. Traditionally...

‣ Effects of web-based electrocardiography simulation on strategies and learning styles; Efeitos da simulação eletrocardiográfica em ambiente web sobre as estratégias e estilos de aprendizagem; Efectos de la simulación electrocardiográfica en ambiente web acerca de las estrategias y estilos de aprendizaje

Granero-Molina, José; Fernández-Sola, Cayetano; López-Domene, Esperanza; Hernández-Padilla, José Manuel; Preto, Leonel; Castro-Sánchez, Adelaida Maria
Fonte: USP, Revista da Escola de Enfermagem Publicador: USP, Revista da Escola de Enfermagem
Tipo: Artigo de Revista Científica
Português
Relevância na Pesquisa
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OBJECTIVETo identify the association between the use of web simulation electrocardiography and the learning approaches, strategies and styles of nursing degree students.METHODA descriptive and correlational design with a one-group pretest-posttest measurement was used. The study sample included 246 students in a Basic and Advanced Cardiac Life Support nursing class of nursing degree.RESULTSNo significant differences between genders were found in any dimension of learning styles and approaches to learning. After the introduction of web simulation electrocardiography, significant differences were found in some item scores of learning styles: theorist (p < 0.040), pragmatic (p < 0.010) and approaches to learning.CONCLUSIONThe use of a web electrocardiogram (ECG) simulation is associated with the development of active and reflexive learning styles, improving motivation and a deep approach in nursing students.

‣ Effects of web-based electrocardiography simulation on strategies and learning styles

Granero-Molina,José; Fernández-Sola,Cayetano; López-Domene,Esperanza; Hernández-Padilla,José Manuel; Preto,Leonel São Romão; Castro-Sánchez,Adelaida María
Fonte: Universidade de São Paulo, Escola de Enfermagem Publicador: Universidade de São Paulo, Escola de Enfermagem
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/08/2015 Português
Relevância na Pesquisa
37.110212%
OBJECTIVETo identify the association between the use of web simulation electrocardiography and the learning approaches, strategies and styles of nursing degree students.METHODA descriptive and correlational design with a one-group pretest-posttest measurement was used. The study sample included 246 students in a Basic and Advanced Cardiac Life Support nursing class of nursing degree.RESULTSNo significant differences between genders were found in any dimension of learning styles and approaches to learning. After the introduction of web simulation electrocardiography, significant differences were found in some item scores of learning styles: theorist (p < 0.040), pragmatic (p < 0.010) and approaches to learning.CONCLUSIONThe use of a web electrocardiogram (ECG) simulation is associated with the development of active and reflexive learning styles, improving motivation and a deep approach in nursing students.

‣ High-resolution electrocardiography in acute myocardial infarct.; Electrocardiografia de alta resolução no enfarte agudo do miocárdio.

Tuna, J L; UTIC-Arsénio Cordeiro, Hospital Santa Maria, Lisboa.
Fonte: Ordem dos Médicos Publicador: Ordem dos Médicos
Tipo: info:eu-repo/semantics/article; article; article; info:eu-repo/semantics/publishedVersion Formato: application/pdf
Publicado em 30/05/1998 Português
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The author starts by highlighting the importance of risk stratification in patients who have survived a myocardial infarction. High resolution electrocardiography, also called signal-averaged electrocardiography (SAECG), appears in this setting as a diagnostic tool that, by providing important information about the way the intraventricular conduction of the electrical impulse is made, contributes to the characterization of the arrhythmogenic substrate, which is the basis of ventricular tachycardia and fibrillation. By resorting to the averaging of the electrocardiographic signal, SAECG enables us to detect ventricular late potentials whenever the analysis of that signal is made in time-domain. Further details, which will enrich the information on ventricular activation, can be obtained if the analysis is made in the frequency-domain (spectral analysis). The importance of detecting abnormalities in the SAECG recordings lies in the fact that those abnormalities are related to the occurrence of ventricular tachycardia and fibrillation, which are responsible for arrhythmic death. After referring to the criteria of positivity of SAECG and its reproducibility, the author approaches the most important part of the paper: the clinical applications of SAECG. After focusing on the interest of the method in noncoronary conditions...

‣ Evaluation of a computer based package on electrocardiography

Devitt, P.; Worthley, S.; Palmer, E.; Cehic, D.
Fonte: ADIS PRESS AUSTRALASIA P/L Publicador: ADIS PRESS AUSTRALASIA P/L
Tipo: Artigo de Revista Científica
Publicado em //1998 Português
Relevância na Pesquisa
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BACKGROUND: Opportunities for interactive learning in electrocardiography are limited--particularly at postgraduate level. In medical education, increasing use is being made of the electronic medium and various materials have been developed to improve clinicians' skills. AIMS: To test and evaluate the learning of electrocardiography among health professionals. METHODS: A software package, containing a tutorial on electrocardiography and a self-assessment programme of 140 electrocardiograms (ECGs) was constructed. Seventy-two health professionals were recruited into the study and tested before and after the study period. Participants were randomly allocated to one of three groups: control (no study material), tutorial or computer. The tutorial group participated in a series of tutorials and the computer group were provided with a CD-ROM containing study material for them to use in their own time. The results were assessed for statistical significance between all groups using analysis of variance techniques. RESULTS: Sixty-one individuals completed the study. Each of the three groups was pre and post tested on their knowledge of electrocardiography and their ability to interpret ECGs. The computer group was the only group to achieve a significant increase in performance in their knowledge on electrocardiography and in their ability to interpret ECGs. CONCLUSIONS: Suitably structured computer programmes are effective in helping clinicians understand electrocardiography and interpret ECGs.

‣ "Avaliação de pacientes assintomáticos com formas cardíacas iniciais da doença de Chagas, através da análise do eletrocardiograma dinâmico, ecocardiograma e peptídeo natriurético tipo B" ; Evaluation of asymptomatic patients with initial cardiac forms of Chagas' disease through the analysis of dynamic electrocardiography, echocardiography and Type-B natriuretic peptides

Marques, Divina Seila de Oliveira
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Tese de Doutorado Formato: application/pdf
Publicado em 08/10/2004 Português
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Para avaliar as características clínicas e evolutivas em pacientes com formas cardíacas iniciais assintomáticas da doença de Chagas, realizou-se estudo prospectivo em 108 pacientes com idade entre 18 e 50 anos, atendidos entre abril e novembro de 2002 no ambulatório de doença de Chagas da Universidade Estadual de Londrina. Os pacientes foram submetidos a 1)avaliação clínica, 2)eletrocardiograma (ECG), 3)radiografia de tórax e cálculo do índice cardio-torácico (ICT), 4)eletrocardiografia dinâmica de 24 horas, 5)ecocardiografia bidimensional com Doppler tecidual e 6)dosagem plasmática do peptídeo natriurético tipo B (BNP). Os pacientes foram divididos em 3 grupos: 50 no GI - ECG e ICT normais, 31 no GIIA - ECG com alterações características de doença de Chagas e 25 no GIIB - ECG com alterações não características de doença de Chagas; To evaluate clinical and evolutive features in patients with initial asymptomatic cardiac Chagas' disease, a prospective study was carried out with 108 patients, age 18 and 50, at the Londrina State University Chagas' disease outpatient clinic, from April to November 2002. Patients were submitted to: 1) clinical evaluation, 2) electrocardiography (EKG), 3) chest radiography and cardiothoracic index (CTI)...

‣ Reduction of diameter of the left ventricle of dogs by plication of the left ventricular free wall

De Andrade, James Newton Bizetto Meira; Wouk, Antonio Felipe; Camacho, Aparecido Antonio; Branco Germiniani, Clotilde de Lourdes; Gavazzoni, Lilian
Fonte: Universidade Estadual Paulista Publicador: Universidade Estadual Paulista
Tipo: Artigo de Revista Científica Formato: 297-300
Português
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27.110212%
Objective - To determine effects of reducing the diameter of the left ventricle of dogs by plication of the left ventricular free wall. Animals - 8 healthy adult mixed-breed dogs. Procedure - Left lateral thoracotomy and a T-shaped pericardiotomy were performed. The free wall of the left ventricle was imbricated with 3 interrupted transfixing sutures applied in a horizontal mattress pattern, using 3-0 polypropylene suture assembled on a straight cutting needle. Surgeons were careful to avoid the coronary vessels. Echocardiography was performed 24 hours before and 48 hours after surgery. Electrocardiography was performed before and 1, 2, 7, 15, 21, 30, and 60 days after surgery. Results - Echocardiographic measurements revealed that the diameter of the left ventricle was reduced by a mean of 23.5%. Electrocardiography revealed ventricular premature complexes 24 hours after surgery that regressed without treatment during the first week after surgery. Conclusions and Clinical Relevance - Plication of the left ventricular free wall of dogs can reduce end-diastolic and end-systolic dimensions of the left ventricle. The technique is simple and does not require cardiopulmonary bypass. According to Laplace's law, the reduction of cardiac diameter leads to reduction on free-wall tension and may improve left ventricular function in dilatated hearts. Thus...

‣ Direct access exercise electrocardiography: a new service that improves the management of suspected ischaemic heart disease in the community.

McClements, B. M.; Campbell, N. P.; Cochrane, D.; Stockman, S.
Fonte: PubMed Publicador: PubMed
Tipo: Artigo de Revista Científica
Publicado em /06/1994 Português
Relevância na Pesquisa
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OBJECTIVE--To assess the safety and value of an exercise electrocardiography service for the diagnosis of suspected ischaemic heart disease to which general practitioners have direct access. DESIGN--Direct access to a hospital exercise electrocardiography service was offered on a trial basis to 122 general practitioners in a defined urban area. Maximal exercise tests were performed according to the modified Bruce protocol and the results were dispatched promptly to the referring doctors who were responsible for the subsequent management of their patients. SETTING--All general practices in north and west Belfast (combined list size about 180,000) and the regional medical cardiology centre. PATIENTS--212 request forms were received in a two year period and 192 eligible patients attended for exercise testing. All patients were suspected to have pain due to myocardial ischaemia, were aged < or = 65, and had no contraindications to exercise testing. MAIN OUTCOME MEASURES--Proportion of general practitioners who used the service. Proportion of exercise tests that were positive. Referring doctors' assessment of the service. RESULTS--43% of general practitioners referred patients and 34 tests (18%) were positive. No complications occurred. The pretest likelihood of ischaemic heart disease...

‣ Avaliação da eletrocardiografia de alta resolução em cães clinicamente normais; High resolution electrocardiography avaliation in clinically healthy dogs

Ferreira, Wagner Luis; Dias, Fernanda Gosuen Gonçalves; Camacho, Aparecido Antonio
Fonte: Universidade de São Paulo. Faculdade de Medicina Veterinária e Zootecnia Publicador: Universidade de São Paulo. Faculdade de Medicina Veterinária e Zootecnia
Tipo: info:eu-repo/semantics/article; info:eu-repo/semantics/publishedVersion; ; ; ; ; ; Formato: application/pdf
Publicado em 01/01/2005 Português
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The aim of this study was to describe the technique and results of high resolution electrocardiography (ECGAR) in clinically healthy dogs. During this research, 32 adult crossed-breed, dogs from both sexes were used, which were divided in four groups accordingly to their mean body weight. The animals were submitted to high resolution electrocardiography in time domain. It was verified that the duration of QRS complex was smaller in the group of dogs with lower body weight when compared to the group of animals weighing over 21 kilograms. Moreover, the duration of the low amplitude signals of the last 40 ms of the QRS complex (LAS 40) did not show significant differences among groups. Also no significant difference was seen among groups in relation to the mean squared root of the squared voltage of the last 40 ms of the QRS complex (RMS 40). These results, once tabled, could contribute for standardization of the reference values for canine ECGAR. Furthermore, these values could serve as foundation for other researches with dogs in risk of development of sustained ventricular arrhythmias and sudden death, through the detection of the so called late potentials.; No presente estudo, descreve-se a técnica e os resultados obtidos da eletrocardiografia de alta resolução (ECGAR) em cães clinicamente normais. Durante a pesquisa...