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2008 Computers in Cardiology最新文献

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Testing the quality of 12 lead holter analysis algorithms 测试了12种主要动态手枪分析算法的质量
2008 Computers in Cardiology Pub Date : 2008-09-01 DOI: 10.1109/CIC.2008.4749076
R. Fischer, M. F. Sinner, R. Petrovic, E. Tarita, S. Kaab, T.K. Zywietz
{"title":"Testing the quality of 12 lead holter analysis algorithms","authors":"R. Fischer, M. F. Sinner, R. Petrovic, E. Tarita, S. Kaab, T.K. Zywietz","doi":"10.1109/CIC.2008.4749076","DOIUrl":"https://doi.org/10.1109/CIC.2008.4749076","url":null,"abstract":"Computer assisted analysis of ECGs has recently experienced a remarkable revival due to its increased importance as biomarker in clinical trials. Especially 12-lead 24 h Holter-recording is nowadays routinely applied. But how accurate is the automatic computer analysis of 12 lead Holter recordings? While there are several data bases to evaluate the performance of 2-lead Holter algorithms, e.g., MIT-BIH, AHA etc., to our knowledge, there is no annotated data base for real 12-lead Holter algorithms. We have therefore created a new 12 lead ECG database containing 50 Holter ECGs from the University Hospital Munich, Campus Grosshadern. The following paper describes the data base and its application for evaluating different 12 lead Holter analysis algorithms in detail.","PeriodicalId":194782,"journal":{"name":"2008 Computers in Cardiology","volume":"152 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":"124368108","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
Diagnosis of cardiac arrhythmia using kernel difference weighted KNN classifier 核差加权KNN分类器诊断心律失常
2008 Computers in Cardiology Pub Date : 2008-09-01 DOI: 10.1109/CIC.2008.4749025
W. Zuo, Weigang Lu, Kehuan Wang, Henggui Zhang
{"title":"Diagnosis of cardiac arrhythmia using kernel difference weighted KNN classifier","authors":"W. Zuo, Weigang Lu, Kehuan Wang, Henggui Zhang","doi":"10.1109/CIC.2008.4749025","DOIUrl":"https://doi.org/10.1109/CIC.2008.4749025","url":null,"abstract":"In this paper, we proposed a kernel difference-weighted k-nearest neighbor classifier (KDF-WKNN) for the diagnosis of cardiac arrhythmia based on the standard 12 lead ECG recordings. Different from classical KNN, KDF-WKNN defines the weighted KNN rule as the constrained least-squares optimization of sample reconstruction from its neighborhood, and then uses the Lagrangian multiplier method to compute the weights of different nearest neighbors by introducing the kernel Gram matrix G. In arrhythmia analysis, it is unavoidable that some attribute values of a person would be missing. Thus, this paper further introduces a modified PCA method to address this problem. To evaluate the performance of KDF-WKNN, Experimental results on the UCI cardiac arrhythmia database indicate that, KDFWKNN is superior to the nearest neighbor classifier, and is very competitive while compared with several state-of-the-art methods in terms of classification accuracy.","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":"124388341","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: 66
Prognostic value of the Time Related Autonomic Balance Indicator for risk evaluation of cardiovascular events in patients with ischemic heart disease 时间相关自主神经平衡指标对缺血性心脏病患者心血管事件风险评价的预后价值
2008 Computers in Cardiology Pub Date : 2008-09-01 DOI: 10.1109/CIC.2008.4749012
M. Matveev, R. Prokopova
{"title":"Prognostic value of the Time Related Autonomic Balance Indicator for risk evaluation of cardiovascular events in patients with ischemic heart disease","authors":"M. Matveev, R. Prokopova","doi":"10.1109/CIC.2008.4749012","DOIUrl":"https://doi.org/10.1109/CIC.2008.4749012","url":null,"abstract":"The study comprised patients with unstable angina (UA), morning (MMI) and non-morning myocardial infarction (NMMI). The heart autonomic balance (HAB) circadian changes were assessed by time related autonomic balance indicator - a non-parametric criterion for estimating the balance by HRV indices from ECG recordings in rest and by parasympathetic or sympathetic stimulation. The results indicated that: i) in patients with UA the sympathetic part in HAB is more time-dependent than in healthy subjects; the vagal circadian characteristic is normal and thus secures a favorable long-term prognosis; ii) in patients with MMI circadian characteristics of HAB consist of sympathetic hyper-activity and normal parasympathetic tone. The sympathetic dysfunction is the reason for the morning peak of CVE; iii) in patients with NMMI the circadian nature of the sympathetic activity is preserved, but the parasympathetic activity are almost absent.","PeriodicalId":194782,"journal":{"name":"2008 Computers in Cardiology","volume":"81 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":"127736779","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
Reentrant mechanisms triggered by ectopic activity in a three-dimensional realistic model of human atrium. a computer simulation study 异位活动在人体心房三维现实模型中触发的重入机制。计算机模拟研究
2008 Computers in Cardiology Pub Date : 2008-09-01 DOI: 10.1109/CIC.2008.4749120
C. Tobón, C. Ruiz, J. Saiz, E. Heidenreich, F. Hornero
{"title":"Reentrant mechanisms triggered by ectopic activity in a three-dimensional realistic model of human atrium. a computer simulation study","authors":"C. Tobón, C. Ruiz, J. Saiz, E. Heidenreich, F. Hornero","doi":"10.1109/CIC.2008.4749120","DOIUrl":"https://doi.org/10.1109/CIC.2008.4749120","url":null,"abstract":"Atrial fibrillation (AF) is the most common tachiarrhythmia. The pulmonary veins (PVs) have the predominant source of ectopic activity involved in the initiation of AF. Atrial remodelling, due to rapid and irregular activation during AF, leaves the tissue vulnerable to reentries. In this work the effects of electrical remodelling were incorporated in a 3D anisotropic model of human atrium. An ectopic focus was applied near to PVs. Electrograms were computed in simulated-electrodes in back wall of left atrial. The ectopic focus induced a figure-of-eight reentry that degenerated to mother rotor, after collisions and wave breaks were observed. Electrograms were more irregular during figure-of-eight reentry and collisions than during rotor activity. Spectral analysis shows multiple frequency peaks, as a consequence of changes of reentrant patterns. Dominant frequency was similar in all measuring points.","PeriodicalId":194782,"journal":{"name":"2008 Computers in Cardiology","volume":"42 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":"133583748","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: 8
Measurement of heart rate and respiratory rate using a textile-based wearable device in heart failure patients 使用基于织物的可穿戴设备测量心力衰竭患者的心率和呼吸率
2008 Computers in Cardiology Pub Date : 2008-09-01 DOI: 10.1109/CIC.2008.4749188
F. Chiarugi, I. Karatzanis, G. Zacharioudakis, P. Meriggi, F. Rizzo, M. Stratakis, S. Louloudakis, C. Biniaris, M. Valentini, M. Di Rienzo, G. Parati
{"title":"Measurement of heart rate and respiratory rate using a textile-based wearable device in heart failure patients","authors":"F. Chiarugi, I. Karatzanis, G. Zacharioudakis, P. Meriggi, F. Rizzo, M. Stratakis, S. Louloudakis, C. Biniaris, M. Valentini, M. Di Rienzo, G. Parati","doi":"10.1109/CIC.2008.4749188","DOIUrl":"https://doi.org/10.1109/CIC.2008.4749188","url":null,"abstract":"Changes in heart rate (HR) and respiratory rate (RespR) may be used as markers of early decompensation in chronic heart failure (CHF) patients monitored at home. Aiming at improving quality of care and at reducing hospitalization rate and health care costs in CHF, progress in technology has led to the development of small portable and even wearable devices for the acquisition and transmission of relevant vital signs to a remote monitoring centre. This paper describes a signal acquisition and processing system, based on a wearable textile-based device with sensors for the measurement of one-lead ECG and chest movement, and focuses on the algorithms for HR and RespR evaluation. An electronic board collects and transmits these signals to a PDA, which sends them via Wi-Fi to a home gateway where the HR and the RespR time series are produced. The home gateway packs the data with other vital signs collected by using different devices and sends them in XML format to a central repository where a clinical decision support system can use them for the detection of early decompensation episodes. The system has successfully overcome a preliminary test phase and is ready for more extensive tests in a real clinical environment.","PeriodicalId":194782,"journal":{"name":"2008 Computers in Cardiology","volume":"82 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":"132685520","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
A novel telerobotic system to remotely navigate standard electrophysiology catheters 一种新型遥控机器人系统，用于远程导航标准电生理导管
2008 Computers in Cardiology Pub Date : 2008-09-01 DOI: 10.1109/CIC.2008.4748996
E. Marcelli, L. Cercenelli, G. Plicchi
{"title":"A novel telerobotic system to remotely navigate standard electrophysiology catheters","authors":"E. Marcelli, L. Cercenelli, G. Plicchi","doi":"10.1109/CIC.2008.4748996","DOIUrl":"https://doi.org/10.1109/CIC.2008.4748996","url":null,"abstract":"Remote manipulation of electrophysiology (EP) catheters by means of magnetically-guided or robotically controlled navigation systems has been recently proposed; however, these systems usually require dedicated catheters and devices. This study aims at evaluating the feasibility of using a novel Telerobotic System (TS) to remotely manipulate standard steerable EP catheters. In order to prevent cardiac tissue damage the TS was equipped with a force sensor to measure the resistance encountered by the catheter while advancing. The use of this novel TS was evaluated in three sheep, by performing remote navigation of a standard EP catheter to selected catheter-endocardium contact targeted sites in the right atrium. Remote catheter navigation by means of the TS was achieved for all targets and the force sensor showed to provide reliable information about catheter advancing and indication about catheter-endocardium contact.","PeriodicalId":194782,"journal":{"name":"2008 Computers in Cardiology","volume":"40 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":"134075776","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: 50
Estimation of pressure gradient images from velocity encoded MR acquisitions 从速度编码MR获取的压力梯度图像估计
2008 Computers in Cardiology Pub Date : 2008-09-01 DOI: 10.1109/CIC.2008.4749196
A. Herment, G. Besson, C. Pellot-Barakat, F. Frouin
{"title":"Estimation of pressure gradient images from velocity encoded MR acquisitions","authors":"A. Herment, G. Besson, C. Pellot-Barakat, F. Frouin","doi":"10.1109/CIC.2008.4749196","DOIUrl":"https://doi.org/10.1109/CIC.2008.4749196","url":null,"abstract":"Magnetic resonance imaging (MRI) offers the potential to estimate blood pressure gradients, by solving the Navier-Stokes model relating the haemodynamic pressure to the acceleration and velocity. Here we compared results directly obtained using acceleration encoded MR sequences with those calculated from MR velocity acquisitions available on clinical systems. We found that using velocity encoded data instead of acceleration encoded data significantly degrade gradient pressure images. Two experimental phantoms were used to separately evaluate the inertial and convective components of the acceleration. To improve the quality of the pressure gradient estimation, the regularization of the acceleration field, calculated from velocity encoded acquisitions was investigated. We also suggest to increase the temporal resolution while lowering spatial resolution to lessen motion artifacts.","PeriodicalId":194782,"journal":{"name":"2008 Computers in Cardiology","volume":"31 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":"133068981","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: 5
Semi-automatic enhancement of atrial models to include atrial architecture and patient specific data: For biophysical simulations 半自动增强心房模型，包括心房结构和患者特定数据:用于生物物理模拟
2008 Computers in Cardiology Pub Date : 2008-09-01 DOI: 10.1109/CIC.2008.4749121
B. Hermosillo
{"title":"Semi-automatic enhancement of atrial models to include atrial architecture and patient specific data: For biophysical simulations","authors":"B. Hermosillo","doi":"10.1109/CIC.2008.4749121","DOIUrl":"https://doi.org/10.1109/CIC.2008.4749121","url":null,"abstract":"Despite its large influence on biophysical simulations, the underlying anatomical representation is often oversimplified. The need for mode detailed anatomical models has been identified by numerous authors. An atrial model including macro and microscopic muscle architecture would help improve the correlation between real and virtual ECGs. In addition it provides a mean to de-couple the simulation domains (anatomy and physiology). A tool developed to create such models is presented. It readily allows fine-tuning factors such as: connectivity, discontinuity, fiber orientation, muscle architecture, and heterogeneities. The algorithms that speed up the conversion of a 3D heart mesh in raw format, into a detailed model of the atria are explained. As a result, patient-specific models are brought one step closer.","PeriodicalId":194782,"journal":{"name":"2008 Computers in Cardiology","volume":"91 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":"124308799","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
Evaluating the risk of a rescue percutaneous coronary intervention after thrombolysis therapy: A decision tree approach 评估溶栓治疗后经皮冠状动脉介入治疗的风险:决策树方法
2008 Computers in Cardiology Pub Date : 2008-09-01 DOI: 10.1109/CIC.2008.4749031
V. Lagani, R. Ceravolo, M. Vatrano, V. Ciconte, D. Conforti
{"title":"Evaluating the risk of a rescue percutaneous coronary intervention after thrombolysis therapy: A decision tree approach","authors":"V. Lagani, R. Ceravolo, M. Vatrano, V. Ciconte, D. Conforti","doi":"10.1109/CIC.2008.4749031","DOIUrl":"https://doi.org/10.1109/CIC.2008.4749031","url":null,"abstract":"Thrombolysis intervention is a common therapeutic practice used in order to dissolve the coronary atherosclerotic plate whenever Percoutaneous Coronary Intervention (PCI) cannot be performed. In case the thrombolytic drug fails, a Rescue PCI is needed in order to restore the normal coronary blood flow. Thus, assessing the individual risk of Thrombolysis failure is a crucial step before deciding to perform a thrombolytic intervention. Aim of the present study is to develop a simple set of rules able to support physicians in discriminating patients eligible for a Thrombolysis intervention. The proposed models pointed out some interesting interactions between blood pressure values and clinical parameters related to patient's metabolism, suggesting new interesting mutual influences among Thrombolysis failure predictors.","PeriodicalId":194782,"journal":{"name":"2008 Computers in Cardiology","volume":"473 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":"121286058","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
Parameters affecting shock decision in pediatric automated defibrillation 影响儿童自动除颤休克决策的参数
2008 Computers in Cardiology Pub Date : 2008-09-01 DOI: 10.1109/CIC.2008.4749195
S. de Gauna, J. Ruiz, U. Irusta, E. Aramendi
{"title":"Parameters affecting shock decision in pediatric automated defibrillation","authors":"S. de Gauna, J. Ruiz, U. Irusta, E. Aramendi","doi":"10.1109/CIC.2008.4749195","DOIUrl":"https://doi.org/10.1109/CIC.2008.4749195","url":null,"abstract":"There are important differences between adult and pediatric ECG. To approve their use in children, the adaptation of automated external defibrillator (AED) shock advice algorithms require a specific analysis of the particular pediatric ECG characteristics. In this study, we measured several pediatric ECG features and assessed their potential ability in the distinction between shockable and non-shockable pediatric rhythms. For this purpose, we compiled a total of 986 pediatric ECG samples classified into four rhythm types: 540 normal sinus rhythm (NSR), 322 supraventricular tachycardia (SVT), 66 ventricular tachycardia (VT) and 58 ventricular fibrillation (VF). The samples were collected from 613 patients of mean age 7.6 years. Five ECG parameters were calculated from the pediatric database: the pulse rate (PR), the percent power around the dominant frequency (DP), the percent power above 12.5 Hz (HP), the baseline content (BC) and the slope bandwidth (SB).","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":"128940821","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: 2
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