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2008 Computers in Cardiology最新文献

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Cardiac and respiratory monitoring through non-invasive and contactless radar technique 通过非侵入式和非接触式雷达技术进行心脏和呼吸监测
2008 Computers in Cardiology Pub Date : 2008-09-01 DOI: 10.1109/CIC.2008.4748999
M. Varanini, P. Berardi, F. Conforti, M. Micalizzi, D. Neglia, A. Macerata
{"title":"Cardiac and respiratory monitoring through non-invasive and contactless radar technique","authors":"M. Varanini, P. Berardi, F. Conforti, M. Micalizzi, D. Neglia, A. Macerata","doi":"10.1109/CIC.2008.4748999","DOIUrl":"https://doi.org/10.1109/CIC.2008.4748999","url":null,"abstract":"The aim of this study was the evaluation of a microwave (MW) device for vital signs monitoring of patients and for MW signal characterization in terms of physiological content and meaning. Experimental tests were executed on volunteers in selected and controlled conditions and with different device setting. In each test session the MW signal was digitally acquired and saved together with true physiological signals coming from standard medical instrumentation. Single and multichannel data processing were applied in order to extract characteristic features from each signal and to identify any significant correlation. The results show the ability of the method to obtain precise indications on small physiological movements such as breathing or heartbeat; the received MW signal seems to offer specific information about the mechanical dynamics of the cardiac system. With our configuration settings, main limitations of this approach come from its low capacity to penetrate deeply into the body and to the poor spatial resolution.","PeriodicalId":194782,"journal":{"name":"2008 Computers in Cardiology","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130358856","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: 25
Effect of lidocaine in acute ischemic situations: A computer modelling study 利多卡因对急性缺血的影响:一项计算机模拟研究
2008 Computers in Cardiology Pub Date : 2008-09-01 DOI: 10.1109/CIC.2008.4749217
K. Cardona, J. Saiz, J. Ferrero, Miguel Ángel Martínez, G. Moltó, V. Hernández
{"title":"Effect of lidocaine in acute ischemic situations: A computer modelling study","authors":"K. Cardona, J. Saiz, J. Ferrero, Miguel Ángel Martínez, G. Moltó, V. Hernández","doi":"10.1109/CIC.2008.4749217","DOIUrl":"https://doi.org/10.1109/CIC.2008.4749217","url":null,"abstract":"Lidocaine is a drug that blocks the sodium channel in a pH, frequency and concentration dependent manner. In this work, we have used a mathematical model of lidocaine developed by our group and incorporated it into the Luo Rudy model of ventricular action potential. We have studied the action of lidocaine on the sodium current (INa), maximum upstroke velocity (dV/dt) and conduction velocity (CV) in ischemic tissue. Additionally, we measured the block window (BW) in different concentrations of drug .Our results show that 100 mumol/L of lidocaine under simulated acute ischemic conditions reduces the INa, dV/dt and CV a 42%, 41% and 24% in the normal zone (cell 54), respectively while in the border zone (cell 94) the decreased was 37%; 44% and 18% for the same parameters. Finally, we have found that lidocaine diminished the BW, thus the drug tends to eliminate the UDB.","PeriodicalId":194782,"journal":{"name":"2008 Computers in Cardiology","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117114052","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
Detecting premature ventricular contractions in ECG signals with Gaussian processes 用高斯过程检测心电信号中的室性早搏
2008 Computers in Cardiology Pub Date : 2008-09-01 DOI: 10.1109/CIC.2008.4749021
F. Melgani, Y. Bazi
{"title":"Detecting premature ventricular contractions in ECG signals with Gaussian processes","authors":"F. Melgani, Y. Bazi","doi":"10.1109/CIC.2008.4749021","DOIUrl":"https://doi.org/10.1109/CIC.2008.4749021","url":null,"abstract":"The aim of this work is twofold. First, we propose to investigate the capabilities of a new Bayesian approach for detecting premature ventricular contractions (PVCs), namely the Gaussian process (GP) approach. Second, we report an experimental comparison of different kinds of ECG signal representations, which are the standard temporal signal morphology, the discrete wavelet transform domain, the S-transform characteristics and the high-order statistics. In general, the obtained classification results show that the GP detector can compete seriously with state-of-the-art methods since it allows to yield better overall accuracy as well as better sensitivity. In addition, among the different kinds of features explored, those based on high-order statistics appear to be the best compromise between accuracy and computational time for PVC detection.","PeriodicalId":194782,"journal":{"name":"2008 Computers in Cardiology","volume":"159 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116234765","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: 20
Simulating the effects of atrial fibrillation in electrically heterogeneous human atria: A computer modelling study 模拟心房颤动在电异质性人类心房的影响:一项计算机建模研究
2008 Computers in Cardiology Pub Date : 2008-09-01 DOI: 10.1109/CIC.2008.4748978
J. Stott, S. Kharche, P. Law, Henggui Zhang
{"title":"Simulating the effects of atrial fibrillation in electrically heterogeneous human atria: A computer modelling study","authors":"J. Stott, S. Kharche, P. Law, Henggui Zhang","doi":"10.1109/CIC.2008.4748978","DOIUrl":"https://doi.org/10.1109/CIC.2008.4748978","url":null,"abstract":"We postulated that atrial fibrillation (AF) induced electrical remodelling in electrically heterogeneous human atria facilitates chronic AF. A modern biophysically detailed mathematical model of human atrial action potential was modified to incorporate electrophysiological properties of different cell types present within the atria. The heterogeneous cell models were then further modified to incorporate data on AF induced electrical remodelling (AFER) of ion channel kinetics and current densities. These modified models were used to simulate electrical activity in cells, ID strands and 2D heterogeneous sheets. AFER heterogeneously reduced action potential duration in all cell types. The theme of inhomogeneous response to AFER was observed through all cell and ID simulations. Sheet simulations showed that whilst re-entry self terminated in the control case, it persisted under AFER conditions.","PeriodicalId":194782,"journal":{"name":"2008 Computers in Cardiology","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115280826","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: 3
Partial volume correction of small animal PET cardiac dynamic images using iterative reconstruction: effects on glucose metabolic rate measurement 使用迭代重建的小动物PET心脏动态图像部分体积校正:对葡萄糖代谢率测量的影响
2008 Computers in Cardiology Pub Date : 2008-09-01 DOI: 10.1109/CIC.2008.4749236
D. D'Ambrosio, G. Fiacchi, P. Cilibrizzi, C. Lamberti, G. Baldazzi, S. Boschi, R. Franchi, M. Marengo, A. Spinelli
{"title":"Partial volume correction of small animal PET cardiac dynamic images using iterative reconstruction: effects on glucose metabolic rate measurement","authors":"D. D'Ambrosio, G. Fiacchi, P. Cilibrizzi, C. Lamberti, G. Baldazzi, S. Boschi, R. Franchi, M. Marengo, A. Spinelli","doi":"10.1109/CIC.2008.4749236","DOIUrl":"https://doi.org/10.1109/CIC.2008.4749236","url":null,"abstract":"Small animal positron emission tomography (PET) image quantitation is severely affected by partial volume effect (PVE) caused by the spatial resolution of PET tomographs. The aim of this work was to reduce the PVE using a modified iterative expectation maximization (EM) reconstruction algorithm. The goal of the method was to increase the accuracy of tracer concentration values in order to obtain an in vivo better estimate of physiological parameters. The performance of the proposed correction method was evaluated by calculating left ventricle and myocardium mean value using simulated cardiac fluorodeoxyglucose (FDG) dynamic images.","PeriodicalId":194782,"journal":{"name":"2008 Computers in Cardiology","volume":"49 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113960795","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
A DVB-T framework for the remote monitoring of cardiopathic and diabetic patients 用于心脏病和糖尿病患者远程监测的DVB-T框架
2008 Computers in Cardiology Pub Date : 2008-09-01 DOI: 10.1109/CIC.2008.4749213
G. Angius, D. Pani, L. Raffo, P. Randaccio
{"title":"A DVB-T framework for the remote monitoring of cardiopathic and diabetic patients","authors":"G. Angius, D. Pani, L. Raffo, P. Randaccio","doi":"10.1109/CIC.2008.4749213","DOIUrl":"https://doi.org/10.1109/CIC.2008.4749213","url":null,"abstract":"Tele-home care systems enable patients with chronic diseases to be remotely and constantly monitored by the healthcare staff reducing the need for frequent visits to the hospital. Besides the advantages for patients, this solution could also provide significant cost savings through the exploitation of low-cost equipment for simple physiological measurements to be performed at home, sending the recorded data to the healthier staff placed elsewhere. Tile aim of this work is the development of a low-cost tele-home care system based on the digital video broadcasting terrestrial (DVB-T) technology for the remote monitoring of cardiopathic and diabetic patients. Easy to use even by untrained or elderly people, such tele-home care system could represent the best solution in terms of simplicity, quality and costs.","PeriodicalId":194782,"journal":{"name":"2008 Computers in Cardiology","volume":"94 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125197289","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: 3
Manifold learning for premature ventricular contraction detection 室性早缩检测的流形学习
2008 Computers in Cardiology Pub Date : 2008-09-01 DOI: 10.1109/CIC.2008.4749192
B. Ribeiro, J.H. Henirques, A. Marques, M. Antunes
{"title":"Manifold learning for premature ventricular contraction detection","authors":"B. Ribeiro, J.H. Henirques, A. Marques, M. Antunes","doi":"10.1109/CIC.2008.4749192","DOIUrl":"https://doi.org/10.1109/CIC.2008.4749192","url":null,"abstract":"Prompt diagnosis of abnormally shaped wave forms in ECG signal is an important component in the early diagnosis of cardiac arrhythmias, improving the quality of life of patients. Meanwhile, detection models for Premature Ventricular Contractions (PVC) are widely investigated, a less studied problem is data analysis and visualization. In this paper, we propose an approach for PVC detection and data visualization by exploiting the intrinsic geometry of the high-dimensional data using manifold learning and Support Vector Machines (SVM). ISOMAP forms a neighborhood-preserving projection which allows to uncover the low-dimensional manifold and is used here as a pre-processing step. Then by incorporating training labels the method is capable of recognizing PVC patterns with comparable accuracy of kernel learning machines.","PeriodicalId":194782,"journal":{"name":"2008 Computers in Cardiology","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126374994","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 blood pressure measurement using dual-cuffs 一种新型的双袖口血压测量仪
2008 Computers in Cardiology Pub Date : 2008-09-01 DOI: 10.1109/CIC.2008.4749003
T. Kim, Y. Chee, J.S. Lee, S. W. Nam, I.Y. Kim
{"title":"A new blood pressure measurement using dual-cuffs","authors":"T. Kim, Y. Chee, J.S. Lee, S. W. Nam, I.Y. Kim","doi":"10.1109/CIC.2008.4749003","DOIUrl":"https://doi.org/10.1109/CIC.2008.4749003","url":null,"abstract":"Most automatic sphygmomanometers use oscillometric method with a blood pressure cuff. Conventional oscillometric sphygmomanometer is simple to use and it needs no peripheral device. However, the method provides no guarantee of accuracy in all circumstance, because it is based on statistics. In this paper, we propose a new oscillometric method with two cuffs. A cuff is placed on upper arm as usual and another cuff is added on forearm. By adding one more blood pressure cuff, there are two different waveforms are shown and the different characteristics between both cuffs can be compared. The results of our experiments show that it is possible to measure blood pressure using dual-cuff oscillometric method.","PeriodicalId":194782,"journal":{"name":"2008 Computers in Cardiology","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129690528","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
ECG and echocardiography processing for decision support in heart failure 心衰患者心电图和超声心动图处理的决策支持
2008 Computers in Cardiology Pub Date : 2008-09-01 DOI: 10.1109/CIC.2008.4749125
F. Chiarugi, S. Colantonio, D. Emmanouilidou, D. Moroni, F. Perticone, A. Sciacqua, O. Salvetti
{"title":"ECG and echocardiography processing for decision support in heart failure","authors":"F. Chiarugi, S. Colantonio, D. Emmanouilidou, D. Moroni, F. Perticone, A. Sciacqua, O. Salvetti","doi":"10.1109/CIC.2008.4749125","DOIUrl":"https://doi.org/10.1109/CIC.2008.4749125","url":null,"abstract":"This paper presents an effective way to achieve a high level integration of signal and image processing methods in the general management of heart failure, by means of a clinical decision support system (CDSS). In particular, significant and suitably designed image and signal processing algorithms are introduced to objectively and reliably evaluate important features that can facilitate decisional problems in collaboration with the CDSS. Architectural details of the components of the CDSS needed for the seamless integration of image and signal analysis work-flows are finally discussed.","PeriodicalId":194782,"journal":{"name":"2008 Computers in Cardiology","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121927935","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
Correlation between multifractal spectrum based on wavelet leaders and T-wave alternans 基于小波前导和t波交替的多重分形谱的相关性研究
2008 Computers in Cardiology Pub Date : 2008-09-01 DOI: 10.1109/CIC.2008.4749150
R. Cardo, Á. Corvalán
{"title":"Correlation between multifractal spectrum based on wavelet leaders and T-wave alternans","authors":"R. Cardo, Á. Corvalán","doi":"10.1109/CIC.2008.4749150","DOIUrl":"https://doi.org/10.1109/CIC.2008.4749150","url":null,"abstract":"In this work we analyze the correlation of the appearing T-wave alternans (TWA) with the shape (range) of the multifractal spectra of the ECG signals obtained with wavelet leaders based methods. A non-null correlation between the TWA occurring and lesser values for the Holder exponent of maximum dimension has been observed, in agreement with the idea that the projection of TWA must have a non-despicable contribution in the higher scales of the multiresolution analysis of the signal. We are developing new algorithms capable to deal with non-concave multifractal spectra based in wavelet leaders projections, instead of existing methods that only gives concave spectra. These new algorithms will give a finer resolution of Holder component of the signal and we hope that this richer information about the sharpness of the signal will allow better estimations of the magnitude of TWA and a closer relation between multifractal spectra and TWA occurring.","PeriodicalId":194782,"journal":{"name":"2008 Computers in Cardiology","volume":"102 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121973466","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
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