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Computers in Cardiology, 2005最新文献

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Characterization of aortic input impedence in the supplemental domain 主动脉输入阻抗在辅助区域的表征
Computers in Cardiology, 2005 Pub Date : 2005-09-01 DOI: 10.1109/CIC.2005.1588227
C. E. Martinez-Cruz, J. Rojo-álvarez, F.J. Vallejo-Ramos, R. Yotti, J. Antoranz, M. García-Fernández, J. Bermejo
{"title":"Characterization of aortic input impedence in the supplemental domain","authors":"C. E. Martinez-Cruz, J. Rojo-álvarez, F.J. Vallejo-Ramos, R. Yotti, J. Antoranz, M. García-Fernández, J. Bermejo","doi":"10.1109/CIC.2005.1588227","DOIUrl":"https://doi.org/10.1109/CIC.2005.1588227","url":null,"abstract":"Although ventricular-arterial coupling has been widely studied with frequency domain modeling of arterial hemodynamics, the existence of reflected flow and pressure waves in the arterial tree still remains controversial. Aortic input impedance (AII) is the ratio between pulsatile aortic pressure and flow waveforms in the frequency domain, and it has been mainly measured using discrete Fourier series (DFS). We propose a signal processing method for accurately estimating the impulse response of AII. In an animal model, the full-band spectra of pulsatile aortic pressure and flow were calculated using homomorphic deconvolution, and then compared to DFS spectra. Given the observed band-limited nature of these signals, we formulated a supplemental domain model for AII estimation, in which calculations are made using equivalent full-band, pole-free spectra of pressure and flow signals. In three animals, impulse responses were obtained, which exhibited among-subjects reproducible patterns in the basal state. The estimation of AII in the supplemental domain allows the estimation of its impulse response, which could explain the role of reflections in the arterial tree","PeriodicalId":239491,"journal":{"name":"Computers in Cardiology, 2005","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128654644","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Identification of aortic stenosis disease using discrete wavelet packet analysis 离散小波包分析在主动脉狭窄疾病诊断中的应用
Computers in Cardiology, 2005 Pub Date : 2005-09-01 DOI: 10.1109/CIC.2005.1588189
B. Al-Naami, J. Chebil, J. Torry
{"title":"Identification of aortic stenosis disease using discrete wavelet packet analysis","authors":"B. Al-Naami, J. Chebil, J. Torry","doi":"10.1109/CIC.2005.1588189","DOIUrl":"https://doi.org/10.1109/CIC.2005.1588189","url":null,"abstract":"Heart auscultation which is the interpretation of sounds produced by the heart is a fundamental tool in the diagnosis of heart disease. It is the most commonly used technique for screening and diagnosis in primary health care. The efficiency of this diagnosis can be improved considerably by using modern digital signal processing techniques. This study aims at utilizing the discrete wavelet packet transforms in early detection of an aortic stenosis (AS) using heart sound data collected at Sussex University Hospital in England. From the data analysis, a criteria has been proposed for the detection of the AS disease from the heart sound data","PeriodicalId":239491,"journal":{"name":"Computers in Cardiology, 2005","volume":"65 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117342854","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 6
A new method for the PP-PR hysteresis phenomenon enhancement under exercise conditions 一种增强运动条件下PP-PR磁滞现象的新方法
Computers in Cardiology, 2005 Pub Date : 2005-09-01 DOI: 10.1109/CIC.2005.1588206
A. Cabasson, Olivier Meste, G. Blain, S. Bermon
{"title":"A new method for the PP-PR hysteresis phenomenon enhancement under exercise conditions","authors":"A. Cabasson, Olivier Meste, G. Blain, S. Bermon","doi":"10.1109/CIC.2005.1588206","DOIUrl":"https://doi.org/10.1109/CIC.2005.1588206","url":null,"abstract":"A non-linear relation between PR and PP intervals has been established in a previous work under maximal and graded exercise test as well as under pyramidal exercise where the effort is not released abruptly This study presents a new method whose aim is to exhibit more clearly the hysteresis behavior of this non-linear relation under graded exercise. After the description of the initial approach, we propose a second one which can provide a better estimation of the PR intervals. Moreover pooling the results of these two methods leads to an improvement of the estimation accuracy of PR intervals and then the hysteresis. It is well known that a hysteresis behavior exists at AV node's level, between the refractory period and the repolarization period. Besides, the autonomic neural system also acts upon the cardiac activity during an intense effort. Therefore, hysteresis which links the \"PR interval vs PP interval\" seems not be explained only at the cellular level; the heart must be viewed in his global context considering the nervous system","PeriodicalId":239491,"journal":{"name":"Computers in Cardiology, 2005","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133238343","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 10
Comparison of the tissue response during the loading with voltage-sensitive dye in two animal models 电压敏感染料在两种动物模型中加载时组织反应的比较
Computers in Cardiology, 2005 Pub Date : 1900-01-01 DOI: 10.1109/CIC.2005.1588156
M. Nováková, M. Blaha, J. Bardoňová, I. Provazník
{"title":"Comparison of the tissue response during the loading with voltage-sensitive dye in two animal models","authors":"M. Nováková, M. Blaha, J. Bardoňová, I. Provazník","doi":"10.1109/CIC.2005.1588156","DOIUrl":"https://doi.org/10.1109/CIC.2005.1588156","url":null,"abstract":"Two animal models - guinea pig and rabbit - were used to record monophasic action potentials using voltage sensitive dye di-4-ANEPPS in isolated hearts perfused according to Langendorf. The hearts undergo the same isolation and loading procedures. Changes in electrogram and coronary flow are followed. During the loading and washout, prominent electrophysiological changes occur (mainly decrease of spontaneous heart rate and changes in the shape of T wave), accompanied with decrease in mean coronary flow. However, these changes differ in the two species. It may be concluded that rabbit heart is more resistant to the changes which are triggered with VSD application. Although these changes are partially reversible in guinea pig heart, this model seems to be more sensitive and thus less reliable","PeriodicalId":239491,"journal":{"name":"Computers in Cardiology, 2005","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115310578","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
Integration of multiple ECG databases into a unified framework 将多个心电数据库集成到一个统一的框架中
Computers in Cardiology, 2005 Pub Date : 1900-01-01 DOI: 10.1109/CIC.2005.1588133
M. de Wijs, M. van Ettinger, S. Meij, S. Nelwan
{"title":"Integration of multiple ECG databases into a unified framework","authors":"M. de Wijs, M. van Ettinger, S. Meij, S. Nelwan","doi":"10.1109/CIC.2005.1588133","DOIUrl":"https://doi.org/10.1109/CIC.2005.1588133","url":null,"abstract":"Nowadays, due to the many different formats used by different manufacturers at the Thoraxcenter and the availability of only one ECG viewer in our Electronic Patient Information System, there is a need to convert the different formats to the format supported and to search for a (Webbased) browser for our ECGs to eliminate the need to install and maintain all clients. We developed a framework focussing on the recently approved SCP standard, to be independent of a manufacturer. This framework can convert SCP, Unipro, and Sifor to each other. Several viewers are available, but difficulties have arisen due to the many degrees of freedom in the earlier SCP versions. For the moment no new viewer has been introduced at our hospital","PeriodicalId":239491,"journal":{"name":"Computers in Cardiology, 2005","volume":"516 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123082311","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 12
A biophysical model of ECG signals during atrial fibrillation used to evaluate the performance of QRST cancellation algorithms 心房颤动期间心电信号的生物物理模型用于评估QRST对消算法的性能
Computers in Cardiology, 2005 Pub Date : 1900-01-01 DOI: 10.1109/CIC.2005.1588107
V. Jacquemet, M. Lemay, J. Vesin, A. van Oosterom, L. Kappenberger
{"title":"A biophysical model of ECG signals during atrial fibrillation used to evaluate the performance of QRST cancellation algorithms","authors":"V. Jacquemet, M. Lemay, J. Vesin, A. van Oosterom, L. Kappenberger","doi":"10.1109/CIC.2005.1588107","DOIUrl":"https://doi.org/10.1109/CIC.2005.1588107","url":null,"abstract":"Characterization of electrical signals during atrial fibrillation (AF) is facilitated when the ventricular electrical activity (QRST complexes) has been suppressed. However, evaluating the performance of the QRST cancellation requires knowing the atrial activity during the QRST complex. A biophysically based model of the ECG during AF was developed, in which the exact separate contributions of the atria and the ventricles is available. Abnormal electrical propagation was simulated in a 3-D model of the human atria. The atrial electrical activity on the thorax was obtained by applying the boundary element method to a compartmental torso model. The ventricular activity was incorporated as a sequence of QRST complexes extracted from the clinical ECG of a patient in sinus rhythm. The ECG obtained as the sum of the atrial and ventricular activity described above may be used as a benchmark for testing and evaluating QRST cancellation and feature extraction techniques","PeriodicalId":239491,"journal":{"name":"Computers in Cardiology, 2005","volume":"78 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116971106","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 7
A sensitivity study of the safety factor for conduction in the myocardium 心肌传导安全系数的敏感性研究
Computers in Cardiology, 2005 Pub Date : 1900-01-01 DOI: 10.1109/CIC.2005.1588244
L. Romero, B. Trénor, J. Ferrero, J. Saiz
{"title":"A sensitivity study of the safety factor for conduction in the myocardium","authors":"L. Romero, B. Trénor, J. Ferrero, J. Saiz","doi":"10.1109/CIC.2005.1588244","DOIUrl":"https://doi.org/10.1109/CIC.2005.1588244","url":null,"abstract":"The safety factor (SF) is an indicator of the safeness of electrical conduction in the myocardium. In the present work, we have studied the sensitivity of the SF defined by Shaw and Rudy to the integration interval (II) using computer simulations, and then defined and evaluated a new and simplified method to calculate SF (SFm). Our results reveal that the sensitivity of the SF to the II is negligible outside the depolarization phase, delimited by the instant when membrane potential derivative (dV/dt) reaches 1% of its maximum (t1%) and the instant when membrane potential is maximum ( tVmax ), so we have computed the SF considering this II. Our SFm shows a desirable behaviour as a) it drops below unity when propagation failure occurs and b) the SFm registered during normoxia decreases when membrane excitability is reduced, and increases when high cell uncoupling is forced. This computational simplification could facilitate the use of the SF in heterogeneous 2D and 3D tissues","PeriodicalId":239491,"journal":{"name":"Computers in Cardiology, 2005","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121262559","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 12
Comparison of fusion techniques for 3D+T echocardiography acquisitions from different acoustic windows 不同声窗三维+T超声心动图采集融合技术的比较
Computers in Cardiology, 2005 Pub Date : 1900-01-01 DOI: 10.1109/CIC.2005.1588054
P. Soler, O. Gérard, P. Allain, E. Saloux, E. Angelini, I. Bloch
{"title":"Comparison of fusion techniques for 3D+T echocardiography acquisitions from different acoustic windows","authors":"P. Soler, O. Gérard, P. Allain, E. Saloux, E. Angelini, I. Bloch","doi":"10.1109/CIC.2005.1588054","DOIUrl":"https://doi.org/10.1109/CIC.2005.1588054","url":null,"abstract":"We propose a new method to combine real-time 3D echocardiography acquisitions from different apical windows. It consists in registering the volumes using only the image data, without external positioning sensors, and combining their intensity values, without requiring a feature extraction method. Registration shows reasonable quantitative results on phantom data and visually acceptable results on in vivo data. We present two new methods for the fusion process: generalized averaging and multiview deconvolution. The latter, which performed best, improved the myocardium contrast by +49.67% and the signal-to-noise ratio by +4.61 dB. These improvements lead to more accurate quantification of cardiac function","PeriodicalId":239491,"journal":{"name":"Computers in Cardiology, 2005","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125848078","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 21
QT dispersion monitoring as a coronary disturbance prediction tool QT离散度监测作为冠状动脉疾患预测工具
Computers in Cardiology, 2005 Pub Date : 1900-01-01 DOI: 10.1109/CIC.2005.1588149
R. Gonzalez, A. Rodriguez, R. Almeida
{"title":"QT dispersion monitoring as a coronary disturbance prediction tool","authors":"R. Gonzalez, A. Rodriguez, R. Almeida","doi":"10.1109/CIC.2005.1588149","DOIUrl":"https://doi.org/10.1109/CIC.2005.1588149","url":null,"abstract":"The goal of this paper is to discuss a method to study the QT interval dispersion continuously. This parameter is computed for each ten-second-signal strip studied. The relationship between the QT dispersion variations and the appearance of cardiac disturbances was analyzed. Forty fifteen-minute healthy ECG and five thirty-minute pathologic stress tests were studied. The QRS complexes were detected and classified as normal or premature according to simple rules, the QRS onset was detected using a nine-point derivative function and the T wave offset was identified with an algorithm that follows the shape of the ECG. The QT dispersion graphic was flat and the mean value was less than 60 ms for every healthy person. However, for each pathologic ECG the QT interval dispersion was over 74 ms before a pathological stage and the graphic was not flat in the minutes previous to the induced cardiac disturbances","PeriodicalId":239491,"journal":{"name":"Computers in Cardiology, 2005","volume":"100 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126599907","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A textile-based wearable system for vital sign monitoring: applicability in cardiac patients 基于纺织品的可穿戴生命体征监测系统:在心脏病患者中的适用性
Computers in Cardiology, 2005 Pub Date : 1900-01-01 DOI: 10.1109/CIC.2005.1588199
M. Rienzo, F. Rizzo, G. Parati, M. Ferratini, G. Brambilla, P. Castiglioni
{"title":"A textile-based wearable system for vital sign monitoring: applicability in cardiac patients","authors":"M. Rienzo, F. Rizzo, G. Parati, M. Ferratini, G. Brambilla, P. Castiglioni","doi":"10.1109/CIC.2005.1588199","DOIUrl":"https://doi.org/10.1109/CIC.2005.1588199","url":null,"abstract":"We presents a new textile-based wearable system, named MagIC (Maglietta Interattiva Computerizzata), for the unobtrusive recording of cardiorespiratory and motion signals during spontaneous behavior in daily life and in a clinical environment. MagIC is composed of a vest, including textile sensors for ECG and breathing frequency detection, and a portable electronic board for motion assessment, signal preprocessing and wireless data transmission to a remote computer. MagIC has been tested in freely moving subjects at work, at home, while driving and cycling. Applicability of the system in a clinical setting is now under evaluation. Recordings performed on cardiac inpatients in bed and during physical exercise showed 1) good signals quality; 2) a correct identification of arrhythmic events; and 3) a correct estimation of the tacogram. These results encourage the further tuning of the MagIC system for a routine use in the clinical practice","PeriodicalId":239491,"journal":{"name":"Computers in Cardiology, 2005","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114957713","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 35
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