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[1989] Proceedings. Computers in Cardiology最新文献

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A comprehensive PC solution to heart rate variability analysis in mental stress 一个全面的PC解决方案，以心率变异性分析在精神压力
[1989] Proceedings. Computers in Cardiology Pub Date : 1989-09-19 DOI: 10.1109/CIC.1989.130598
R. Colombo, G. Mazzuero, F. Soffiantino, M. Ardizzoia, G. Minuco
{"title":"A comprehensive PC solution to heart rate variability analysis in mental stress","authors":"R. Colombo, G. Mazzuero, F. Soffiantino, M. Ardizzoia, G. Minuco","doi":"10.1109/CIC.1989.130598","DOIUrl":"https://doi.org/10.1109/CIC.1989.130598","url":null,"abstract":"To assess the modifications of the sympathovagal balance induced by mental stress, a computerized system has been developed which is able to carry out a complete spectral analysis of the heart rate variability (HRV) signal. Based on a personal computer, it acquires ECG (electrocardiography), respiratory, and blood pressure signals for each step of a mental stress trial. The collected data are then processed and spectral analysis is carried out by conventional FFT. In addition, an autoregressive identification algorithm computes the power and central frequency of the spectra peaks, allowing automatic classification of low-frequency (LF) and high-frequency (HF) peaks. The analysis executed for each step of the trial allows the comparison of the various spectral responses corresponding to different stimulations. This system was tested on 32 recently infarcted subjects and results show a significant increment in LF peak (P<0.005) and a significant reduction in HF peak (P<0.05) during a mental arithmetic task. Preliminary results suggest that this method can be considered a useful technique for evaluating the autonomic response to mental stress.<<ETX>>","PeriodicalId":161494,"journal":{"name":"[1989] Proceedings. Computers in Cardiology","volume":" 18","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120828897","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: 51
Quality control in a Holter laboratory 霍尔特实验室的质量控制
[1989] Proceedings. Computers in Cardiology Pub Date : 1989-09-19 DOI: 10.1109/CIC.1989.130585
A. Goldberg, C. Kelly, N. Sullivan
{"title":"Quality control in a Holter laboratory","authors":"A. Goldberg, C. Kelly, N. Sullivan","doi":"10.1109/CIC.1989.130585","DOIUrl":"https://doi.org/10.1109/CIC.1989.130585","url":null,"abstract":"Summary form only given. The quality control program in the Holter laboratory has been on going for three years. Over this time, volume has increased from 5794 ECG (electrocardiographic) tapes/year (1987) to 6038 (1988) and 6400 (projected 1989). Technician productivity has increased from 4.8 tapes/day (1987) to 5.1 (1988) and 5.7 (1989). Because of the complex process necessary to produce a full report, an attempt has been made to examine the quality at each step, with the equipment separated from the technician component The equipment is tested for frequency response and timing, with isolated problems being identified. Since the laboratory serves 30 hospital clinics, the greatest problem is electrode placement on the patient. Eighteen hours of analyzable data were obtained from 92% of the recordings. Accuracy of analysis is measured by technicians' bi-weekly reading of a hand-counted tape from a library. Accuracy for the laboratory has increased from 87% (1987) and 90% (1988) to 93% (1989). Precision is measured by technicians' biweekly reading of a tape that they had read in the previous 2 weeks. Precision for the laboratory was 95% in 1988 and 96% in 1989.<<ETX>>","PeriodicalId":161494,"journal":{"name":"[1989] Proceedings. Computers in Cardiology","volume":"28 6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132557255","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
3D simulation of the electrical activity patterns in the ischemic heart 缺血心脏电活动模式的三维模拟
[1989] Proceedings. Computers in Cardiology Pub Date : 1989-09-19 DOI: 10.1109/CIC.1989.130500
E. Barta, S. Sideman
{"title":"3D simulation of the electrical activity patterns in the ischemic heart","authors":"E. Barta, S. Sideman","doi":"10.1109/CIC.1989.130500","DOIUrl":"https://doi.org/10.1109/CIC.1989.130500","url":null,"abstract":"A 3D simulation of the electrical activation map of the acute and chronic ischemic left ventricle (LV) is presented. The myocardial activation time maps and the signal propagation trajectories are determined by stipulating that the activation signals always propagate along the fastest possible trajectories. The high degree of nonhomogeneity of the physiological and electrophysiological tissue properties associated with the pathological ischemic LV is accounted for. The basic parameters are geometry and structure of the LV structural parameters on the macro level, distribution of the conduction speeds and refractory periods, effect of ischemia on the Purkinje and conduction networks, and details of ectopic activity. Ventricular tachycardia, reentrant circuits, and wave fractionation are detected when ectopic activity occurs at certain combinations of physiological parameters, demonstrating the potential of this 3-D simulation to determine the conditions responsible for the formation of arrhythmias.<<ETX>>","PeriodicalId":161494,"journal":{"name":"[1989] Proceedings. Computers in Cardiology","volume":"2007 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128944706","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
Repolarization duration variability: a tool to quantify the autonomic balance at the ventricle 复极持续时间变异性:量化心室自主神经平衡的工具
[1989] Proceedings. Computers in Cardiology Pub Date : 1989-09-19 DOI: 10.1109/CIC.1989.130560
M. Merri, M. Alberti, W. J. Hall, D. Edward, E. Titlebaum, A. Moss
{"title":"Repolarization duration variability: a tool to quantify the autonomic balance at the ventricle","authors":"M. Merri, M. Alberti, W. J. Hall, D. Edward, E. Titlebaum, A. Moss","doi":"10.1109/CIC.1989.130560","DOIUrl":"https://doi.org/10.1109/CIC.1989.130560","url":null,"abstract":"In order to gain insight into the process of cardiac repolarization, the authors defined and studied the repolarization duration variability (RDV) on electrocardiograms. Spectrum techniques were used to evaluate the influence of the autonomic nervous system in the control of repolarization duration (RD). Coherence analysis was used to quantify common contributions between RDV and heart rate variability. The latter gave a reference of the sympathovagal balance. It was found that the autonomic nervous system acts tonically and directly to control RD. This action is mediated through both autonomic limbs.<<ETX>>","PeriodicalId":161494,"journal":{"name":"[1989] Proceedings. Computers in Cardiology","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128869324","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
Myocardial border tracking in M-mode echocardiograms using joint process estimation 联合过程估计在m型超声心动图心肌边界跟踪中的应用
[1989] Proceedings. Computers in Cardiology Pub Date : 1989-09-19 DOI: 10.1109/CIC.1989.130568
L. Dong, G. Pelle, M. Unser, Y. Brahimi, P. Brun
{"title":"Myocardial border tracking in M-mode echocardiograms using joint process estimation","authors":"L. Dong, G. Pelle, M. Unser, Y. Brahimi, P. Brun","doi":"10.1109/CIC.1989.130568","DOIUrl":"https://doi.org/10.1109/CIC.1989.130568","url":null,"abstract":"A sequential approach to the detection of myocardial borders in M-mode echocardiograms is introduced. Initial border estimates are obtained from a cross-correlation detector. They are then improved by an adaptive lattice-form joint process predictor. Alternatively, a physiological constraint is used to improve the detection of the endocardium during systole. A least squares algorithm is proposed to update recursively the correlation templates in order to track their temporal variations.<<ETX>>","PeriodicalId":161494,"journal":{"name":"[1989] Proceedings. Computers in Cardiology","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122027701","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
Computer filtering of an ECG signal based on the prior knowledge principle-general concept 基于先验知识原理的心电信号的计算机滤波
[1989] Proceedings. Computers in Cardiology Pub Date : 1989-09-19 DOI: 10.1109/CIC.1989.130577
M. Slonim, M. Levi, D. Yaron, E. A. Ovsyshcher
{"title":"Computer filtering of an ECG signal based on the prior knowledge principle-general concept","authors":"M. Slonim, M. Levi, D. Yaron, E. A. Ovsyshcher","doi":"10.1109/CIC.1989.130577","DOIUrl":"https://doi.org/10.1109/CIC.1989.130577","url":null,"abstract":"A novel computer method for ECG (electrocardiographic) signal filtering is discussed. This method is based on a concept called the prior knowledge principle (PKP). The PKP assumes that the measured signal contains the ECG signal itself and environmental noises. An artificial signal with amplitude and time resembling the real ECG signal has been constructed. Cases of white and network noise are analyzed, with the level of noise varying from 0 to 100%. The calculated errors for the techniques used do not exceed 20%.<<ETX>>","PeriodicalId":161494,"journal":{"name":"[1989] Proceedings. Computers in Cardiology","volume":"136 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128268544","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
QRS morphology representation and noise estimation using the Karhunen-Loeve transform 基于Karhunen-Loeve变换的QRS形态学表示与噪声估计
[1989] Proceedings. Computers in Cardiology Pub Date : 1989-09-19 DOI: 10.1109/CIC.1989.130540
G. Moody, R. Mark
{"title":"QRS morphology representation and noise estimation using the Karhunen-Loeve transform","authors":"G. Moody, R. Mark","doi":"10.1109/CIC.1989.130540","DOIUrl":"https://doi.org/10.1109/CIC.1989.130540","url":null,"abstract":"The authors describe robust methods for deriving Karhunen-Loeve (KL) basis functions, which can be used to represent the QRS complex. Using a five-term KL expansion of a 200-ms interval, which includes the QRS complex and part of the ST segment, one can represent morphology on two simultaneous ECG (electrocardiographic) leads with sufficient fidelity for beat classification. The residual error of the representation is an ideal estimate of the instantaneous noise content of the signal and permits identification of events for which the morphologic information is unreliable. The authors have compared the performance of the current KL-based arrhythmia analysis program with its predecessor (which uses a set of time-domain features for morphology representation but is otherwise identical to the newer program). In evaluations using the MIT-BIH and AHA (American Heart Association) databases, and a newly developed database containing approximately 2.5 million annotated beats (including over 80000 premature ventricular contractions) from 27 long-term ECG recordings, it was found that beat classification errors using the KL transform were as little as one-fourth of those for the older program.<<ETX>>","PeriodicalId":161494,"journal":{"name":"[1989] Proceedings. Computers in Cardiology","volume":"375 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130501143","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: 132
Transdermal scopolamine increases heart rate variability by selective parasympathetic stimulation 经皮东莨菪碱通过选择性副交感神经刺激增加心率变异性
[1989] Proceedings. Computers in Cardiology Pub Date : 1989-09-19 DOI: 10.1109/CIC.1989.130477
T. Vybiral, R. Bryg, M. Maddens, M. Lehmann, W. Boden
{"title":"Transdermal scopolamine increases heart rate variability by selective parasympathetic stimulation","authors":"T. Vybiral, R. Bryg, M. Maddens, M. Lehmann, W. Boden","doi":"10.1109/CIC.1989.130477","DOIUrl":"https://doi.org/10.1109/CIC.1989.130477","url":null,"abstract":"Summary form only given. It was hypothesized that the transdermal application of low-dose scopolamine using the unique therapeutic system Transderm Scop would selectively augment parasympathetic cardiac reflex activity and increase heart rate variability. The authors tested several indices of heart rate variability in 31 healthy adults (age: 31+or-7 years) after 234 hours of exposure to one patch of transdermal scopolamine. It was confirmed that transdermal scopolamine markedly increases heart rate variability in healthy human adults. Power spectrum analysis of R-R intervals appears to be a very sensitive measure of changes occurring within the autonomic nervous system. Changes in the power of the 0.25-Hz band, in particular, reliably indicate changes in parasympathetic nervous system activity. Transdermal scopolamine thus holds promise as a therapeutic intervention for selectively enhancing abnormally decreased vagal tone in patients after myocardial infarction, whose reduced heart rate variability may be restored to normal.<<ETX>>","PeriodicalId":161494,"journal":{"name":"[1989] Proceedings. Computers in Cardiology","volume":"762 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116130485","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
Mathematical model of reentry of cardiac excitation 心脏兴奋再入的数学模型
[1989] Proceedings. Computers in Cardiology Pub Date : 1989-09-19 DOI: 10.1109/CIC.1989.130502
Yoram Rudy, Weilun Quan
{"title":"Mathematical model of reentry of cardiac excitation","authors":"Yoram Rudy, Weilun Quan","doi":"10.1109/CIC.1989.130502","DOIUrl":"https://doi.org/10.1109/CIC.1989.130502","url":null,"abstract":"A computer model of a ring-shaped cardiac fiber was used to examine responses of propagation to premature stimuli under different degrees of cell-to-cell coupling and membrane excitability. Nonsustained and sustained reentries were induced by a properly timed premature stimulus. The likelihood of inducing reentry is proportional to the degree of cellular uncoupling, demonstrating the importance of cellular uncoupling in the genesis of reentry. Alternans in action potential duration were also demonstrated during circus movement and were caused by the alternating kinetic properties of the slow ionic currents.<<ETX>>","PeriodicalId":161494,"journal":{"name":"[1989] Proceedings. Computers in Cardiology","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115471242","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 automatic baseline drift correction method 一种自动基线漂移校正方法
[1989] Proceedings. Computers in Cardiology Pub Date : 1989-09-19 DOI: 10.1109/CIC.1989.130539
F. Gritzali, G. Frangakis, G. Papakonstantinou
{"title":"An automatic baseline drift correction method","authors":"F. Gritzali, G. Frangakis, G. Papakonstantinou","doi":"10.1109/CIC.1989.130539","DOIUrl":"https://doi.org/10.1109/CIC.1989.130539","url":null,"abstract":"Baseline drift correction is a necessary step before measuring the amplitudes and durations of the cardiac waves in automated ECG (electrocardiographic) processing. A novel method for automatic baseline drift correction is described. This method uses many reference points per cardiac cycle which are precisely determined by means of a rigorous mathematical method instead of one reference point empirically determined, utilized by other methods. It can handle 'jumps' since it considers each cardiac cycle separately, whereas the other methods consider all cardiac cycles simultaneously. Extensive experimentation using the CSE-ECG library indicates that this method gives better results than the other methods.<<ETX>>","PeriodicalId":161494,"journal":{"name":"[1989] Proceedings. Computers in Cardiology","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114062178","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
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