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2008 Computers in Cardiology最新文献

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Effect of heart rate and body position on the complexity of the QRS and T wave in healthy subjects 心率和体位对健康受试者QRS和T波复杂性的影响
2008 Computers in Cardiology Pub Date : 2008-09-01 DOI: 10.1109/CIC.2008.4749018
V. Batchvarov, G. Bortolan, I. Christov
{"title":"Effect of heart rate and body position on the complexity of the QRS and T wave in healthy subjects","authors":"V. Batchvarov, G. Bortolan, I. Christov","doi":"10.1109/CIC.2008.4749018","DOIUrl":"https://doi.org/10.1109/CIC.2008.4749018","url":null,"abstract":"We analysed the effect of heart rate and body position on the complexity of the QRS and T wave quantified by the ratio of 2nd/1st eigenvalue from principal component analysis (PCA) (QRS-PCA, T-PCA) using continuous 25 min 12-lead digital ECGs (500 Hz, 4.88 muV resolution) acquired on 2 occasions in supine and standing position in 15 healthy subjects (8 men, age 28.6plusmn7.5 years). In the group as a whole, QRS-PCA and T-PCA did not differ significantly between the two positions. However, the linear correlation coefficient between the PCA parameters and the RR interval varied widely between different subjects in the supine position (QRS-PCA: from 0.002 to 0.61; T-PCA: from 0.01 to 0.65) and even more in standing position (QRS-PCA: from -0.55 to 0.48; T-PCA: from -0.63 to 0.51). In both positions, the intra-subject variability of QRS-PCA and T-PCA was significantly smaller than the inter-subject variability.","PeriodicalId":194782,"journal":{"name":"2008 Computers in Cardiology","volume":"92 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":"129311254","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: 16
Motion estimation in X-ray rotational angiography using a 3-D deformable coronary tree model 三维可变形冠状树模型在x线旋转血管造影中的运动估计
2008 Computers in Cardiology Pub Date : 2008-09-01 DOI: 10.1109/CIC.2008.4749095
A. Bousse, J.Z. Zhou, G. Yang, J. Bellanger, C. Toumoulin
{"title":"Motion estimation in X-ray rotational angiography using a 3-D deformable coronary tree model","authors":"A. Bousse, J.Z. Zhou, G. Yang, J. Bellanger, C. Toumoulin","doi":"10.1109/CIC.2008.4749095","DOIUrl":"https://doi.org/10.1109/CIC.2008.4749095","url":null,"abstract":"This paper presents a two stages method for three-dimensional (3-D) coronary artery motion estimation from rotational X-ray projection. In the first step we estimate a 3-D skeleton of the coronary tree at each cardiac phase, using a deformable coronary tree model. The second stage proceeds with a motion estimation between the 3-D reconstructed coronary trees over the cardiac cycle. This estimation is based on a 3-D B-spline interpolation model.","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":"129356477","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: 1
Cardiopulmonary reflex influence on the system hemodynamic rapid regulation mechanisms 心肺反射对系统血流动力学的快速调节机制的影响
2008 Computers in Cardiology Pub Date : 2008-09-01 DOI: 10.1109/CIC.2008.4749163
O. Mamontov, A. Kalinichenko, A. Conrady, E. Shlyakhto
{"title":"Cardiopulmonary reflex influence on the system hemodynamic rapid regulation mechanisms","authors":"O. Mamontov, A. Kalinichenko, A. Conrady, E. Shlyakhto","doi":"10.1109/CIC.2008.4749163","DOIUrl":"https://doi.org/10.1109/CIC.2008.4749163","url":null,"abstract":"The aim of this study was to assess the cardiopulmonary baroreflex contribution to the maintenance of arterial pressure stability. Twelve young healthy subjects were examined (mean age -25.7 plusmn 4.9 years). Cardiac rhythm and arterial pressure were continuously recorded with the use of finapress technique at rest and in the course of low pressure area receptors deactivation due to lower body negative pressure (-10 mm Hg). The recorded data were processed by special MATLAB program that calculated heart rate (HR) and blood pressure (BP) spectral parameters and also cross-spectral power density between HR and BP. The obtained results demonstrated that CPBR is involved in the process of vessel tone fine regulation by means of both slow and rapid regulating mechanisms.","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":"115724152","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: 1
The Chaos Theory and Non-linear Dynamics in Heart Rate Variability in Patients with Heart Failure 心力衰竭患者心率变异性的混沌理论和非线性动力学
2008 Computers in Cardiology Pub Date : 2008-09-01 DOI: 10.1109/CIC.2008.4749202
G. Krstačić, D. Gamberger, A. Krstačić, T. Šmuc, D. Miličić
{"title":"The Chaos Theory and Non-linear Dynamics in Heart Rate Variability in Patients with Heart Failure","authors":"G. Krstačić, D. Gamberger, A. Krstačić, T. Šmuc, D. Miličić","doi":"10.1109/CIC.2008.4749202","DOIUrl":"https://doi.org/10.1109/CIC.2008.4749202","url":null,"abstract":"This study evaluate and quantify the non-linear dynamic changes of heart rate variability based on ldquochaos theoryrdquo and fractal mathematics in 250 patients with heart failure during 12 months. Some different non-linear methods were applied: fractal dimension (FD), detrented fluctuation analysis (DFA) and approximate entropy (ApEn). Fractal correlation properties and fractal dimension in this study may reflect altered neuroanatomic interaction that may predispose to the development of severe HF. It was found that the short-term fractal scaling exponent (alpha1) is significantly lower in patients with HF. The patients with HF had also lower approximate entropy and higher fractal dimension with positive impact of modern HE therapy.","PeriodicalId":194782,"journal":{"name":"2008 Computers in Cardiology","volume":"14 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":"114871815","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: 14
Neural network based canceller for Powerline Interference in ECG signals 基于神经网络的心电信号电力线干扰消除方法
2008 Computers in Cardiology Pub Date : 2008-09-01 DOI: 10.1109/CIC.2008.4749231
J. Mateo, C. Sánchez, A. Tortes, R. Cervigón, J. J. Rieta
{"title":"Neural network based canceller for Powerline Interference in ECG signals","authors":"J. Mateo, C. Sánchez, A. Tortes, R. Cervigón, J. J. Rieta","doi":"10.1109/CIC.2008.4749231","DOIUrl":"https://doi.org/10.1109/CIC.2008.4749231","url":null,"abstract":"Power line interference may severely corrupt a biomedical recording. Notch Filters and adaptive cancellers have been suggested to suppress this interference. In this paper, an improved adaptive canceller for the reduction of the fundamental power line interference component in electrocardiogram (ECG) recordings is proposed. A comparison is made between the performance of our method and a narrow and a wide notch filter and notch adaptive filter in suppressing the fundamental power line interference component. For this purpose, a deal ECG signal is corrupted by an artificial power line interference signal. The cleaned signal after applying all methods is compared with the original ECG signal. Results indicate that power line interference of ECG are removed effectively by this new method. Interference elimination can be performed continuously and rapidly even if the situations of interference are changing with time or frequency. In the worst conditions 48.5 Hz and 51.5 Hz (BW 1.5 Hz), ANN obtained results show the efficiency (CCC=0.96plusmn0.02 SIR=17.3plusmn0.4) in comparison with the classical technique with the best performance (CCC=0.91plusmn0.03 SIR=13.2plusmn0.6). The method is easy to implement and it is applicable not only to ECG but also other biomedical signals.","PeriodicalId":194782,"journal":{"name":"2008 Computers in Cardiology","volume":"106 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":"128138489","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: 18
The role of volume conductivities in simulation of implantable defibrillators 体积电导率在模拟植入式除颤器中的作用
2008 Computers in Cardiology Pub Date : 2008-09-01 DOI: 10.1109/CIC.2008.4749083
J. Stinstra, M. Jolley, J. Tate, D. Brooks, J. Triedman, R. Macleod
{"title":"The role of volume conductivities in simulation of implantable defibrillators","authors":"J. Stinstra, M. Jolley, J. Tate, D. Brooks, J. Triedman, R. Macleod","doi":"10.1109/CIC.2008.4749083","DOIUrl":"https://doi.org/10.1109/CIC.2008.4749083","url":null,"abstract":"In the quest for patient specific models for predicting defibrillation efficacy, one of the questions is which tissue types to include into a volume conductor model of the torso. We present a comparison between a model consisting of 11 different tissue types to models with only a subset of of tissue types across a database of electrode orientations including transvenous, epicardial, and subcutaneous electrodes. The simulations show that the volume conductor models should at least include segmentations for the heart, lungs, blood, and bones, and possibly the fat layers and the amount of gaseous space in the stomach and intestines. The latter ones may be necessary for modeling subcutaneous electrode configurations and ICD ldquocansrdquo in the abdomen.","PeriodicalId":194782,"journal":{"name":"2008 Computers in Cardiology","volume":"32 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":"126525693","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
An algorithm for robust detection of QRS onset and offset in ECG signals 心电信号中QRS起始和偏移的鲁棒检测算法
2008 Computers in Cardiology Pub Date : 2008-09-01 DOI: 10.1109/CIC.2008.4749177
A. Illanes-Manriquez, Qinghua Zhang
{"title":"An algorithm for robust detection of QRS onset and offset in ECG signals","authors":"A. Illanes-Manriquez, Qinghua Zhang","doi":"10.1109/CIC.2008.4749177","DOIUrl":"https://doi.org/10.1109/CIC.2008.4749177","url":null,"abstract":"This paper proposes a robust algorithm for QRS onset and offset detection in ECG signals. It mainly consists of the computation of an indicator related to the area covered by the QRS complex envelope. This algorithm was initially developed for the detection of T wave end, whose robustness and efficiency for that purpose have been previously reported. Its performances for QRS onset and offset detection have been evaluated using the PhysioNet QT database. For QRS offset detection, this new algorithm improves the best results reported in the publications about other algorithms evaluated on the same database, and for QRS onset detection, its performance is close to the best published results.","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":"123629942","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
Two types of distribution patterns of bigeminy and trigeminy in long-term ECG: a model-based interpretation 长期心电双叉和三叉的两种分布模式:基于模型的解释
2008 Computers in Cardiology Pub Date : 2008-09-01 DOI: 10.1109/CIC.2008.4749225
N. Ikeda, K. Takayanagi, A. Takeuchi, N. Mamorita, H. Miyahara
{"title":"Two types of distribution patterns of bigeminy and trigeminy in long-term ECG: a model-based interpretation","authors":"N. Ikeda, K. Takayanagi, A. Takeuchi, N. Mamorita, H. Miyahara","doi":"10.1109/CIC.2008.4749225","DOIUrl":"https://doi.org/10.1109/CIC.2008.4749225","url":null,"abstract":"Two types of distribution patterns of bigeminy and trigeminy are found in analysis of long-term ECG. To investigate the mechanism underlying this finding, a simplified equation of a modulated parasystole model was used and symbolic solutions for cyclic VPC patterns were obtained. The map of these solutions in a model parameter plane showed two different solutions for bigeminy, four kinds of trigeminy, two kinds of quadrigeminy, combinations of these patterns, and apparently normal ECG. These results are used to explain the features of the distribution patterns.","PeriodicalId":194782,"journal":{"name":"2008 Computers in Cardiology","volume":"112 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":"124798621","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
Non-invasive evaluation of opening and closing timings of the cardiac valves in the fetal cardiac cycle 胎儿心脏周期中心脏瓣膜开启和关闭时间的无创评估
2008 Computers in Cardiology Pub Date : 2008-09-01 DOI: 10.1109/CIC.2008.4749228
A. Khandoker, Y. Kimura, T. Ito, N. Sato, K. Okamura, M. Palaniswami
{"title":"Non-invasive evaluation of opening and closing timings of the cardiac valves in the fetal cardiac cycle","authors":"A. Khandoker, Y. Kimura, T. Ito, N. Sato, K. Okamura, M. Palaniswami","doi":"10.1109/CIC.2008.4749228","DOIUrl":"https://doi.org/10.1109/CIC.2008.4749228","url":null,"abstract":"In this study, we propose a non-invasive system to recognize the timings of fetal cardiac events on the basis of analysis of fetal ECG and Doppler ultrasound signal together. Fetal ECG was extracted from transabdominal ECG (10 normal subjects, 38-41 weeks of gestation) using blind source separation with the reference signal. Multiresolution wavelet analysis enabled the frequency contents of the Doppler signals to be linked to the opening(o) and closing(c) of the heartpsilas valves (Aortic (A) and mitral(M)). M-mode, B-mode and pulsed Doppler ultrasound were used to examine and verify the timings of opening and closure of aortic as well as mitral valves. The time intervals from Q-wave of QRS complex of fetal ECG to opening and closing of aortic valve, i.e. Q-Ao and Q-Ac were found to be 75.0plusmn11.9 (msec) and 221.6plusmn29.0 (msec) respectively. As for the mitral valve, Q-Mc and Q-Mo were found to be 45.0plusmn18.9 (msec) and 301.6plusmn20.7 (msec) respectively.","PeriodicalId":194782,"journal":{"name":"2008 Computers in Cardiology","volume":"61 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":"116595110","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
Assessment of cardiac apex kinematics using a real-time 3D magnetic tracking system 利用实时三维磁跟踪系统评估心脏顶点运动学
2008 Computers in Cardiology Pub Date : 2008-09-01 DOI: 10.1109/CIC.2008.4749062
E. Marcelli, S. Spolzino, L. Cercenelli, A. Cappello, P. Bagnoli, M. Costantino, N. Malagutti, R. Fumero, G. Plicchi
{"title":"Assessment of cardiac apex kinematics using a real-time 3D magnetic tracking system","authors":"E. Marcelli, S. Spolzino, L. Cercenelli, A. Cappello, P. Bagnoli, M. Costantino, N. Malagutti, R. Fumero, G. Plicchi","doi":"10.1109/CIC.2008.4749062","DOIUrl":"https://doi.org/10.1109/CIC.2008.4749062","url":null,"abstract":"The assessment of left ventricular apex (LVA) kinematics throughout the cardiac cycle could be useful for evaluating cardiac performance and efficiency. We proposed and evaluated in a sheep the use of a real-time 3D magnetic tracking system for the analysis of LVA kinematics. LVA kinematics was assessed using a real-time 3D magnetic tracking system, whose sensor was epicardially glued on the exposed LVA. Two indexes were calculated from the 3-Dimensional apex path traced by the magnetic sensor: the 3D Apex Path Length (3DAPL, length of 3D apex path) and the 3D Apex Path Volume (3DAPV, volume containing 3D apex path). Hemodynamic index of cardiac contractility (LVdP/dtMAX) was derived from Left Ventricular Pressure (LVP) measurement and evaluated against LVA kinematics parameters, at baseline and after acute ischemia, experimentally induced by coronary ligation. Results showed an opposite trend between LV hemodynamics and LVA kinematics: in the ischemic heart an increase of both 3DAPL (+24.5%) and 3DAPV (+151.7%) occurred compared with baseline, while LVdP/dtMAX decreased (-36.9%).","PeriodicalId":194782,"journal":{"name":"2008 Computers in Cardiology","volume":"103 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":"115034977","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: 1
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