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Computers in Cardiology 1997最新文献

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QT dispersion and principal component analysis in prehospital patients with chest pain 院前胸痛患者QT离散度及主成分分析
Computers in Cardiology 1997 Pub Date : 1997-09-07 DOI: 10.1109/CIC.1997.648138
T. Aufderheide, S. Reddy, Q. Xue, A. Dhala, R. Thakur, W. Brady, I. Rowlandson
{"title":"QT dispersion and principal component analysis in prehospital patients with chest pain","authors":"T. Aufderheide, S. Reddy, Q. Xue, A. Dhala, R. Thakur, W. Brady, I. Rowlandson","doi":"10.1109/CIC.1997.648138","DOIUrl":"https://doi.org/10.1109/CIC.1997.648138","url":null,"abstract":"The objective of this study was to measure QT dispersion (QTD) and principal component analysis (PCA) ratio, using a newly developed algorithm, in a broad range of chest pain patients to determine potential value in diagnosing ischemic heart disease. The algorithm for determining QTD is based on least-square-fit technique, which has better reproducibility than threshold and simple slope methods. QTD and PCA measurements were retrospectively computer-calculated in adults with a chief or secondary complaint of chest pain or equivalent syndrome who had prehospital 12-lead ECGs acquired by paramedics. There were 2157 patients with evaluable data in the final study population. 53% were males, 47% females. Using a threshold of 46 ms, QTp global measurement had a sensitivity/specificity of 60%/90% for AMI and 28%/90% for angina. For AMI, using a threshold of 31, PCA ratio had a sensitivity/specificity of 35%/90%. These data support the contention that QTD and PCA may be useful diagnostic adjuncts for detection of ischemic heart disease.","PeriodicalId":228649,"journal":{"name":"Computers in Cardiology 1997","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134301552","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
Flow velocity distribution near the arterial bifurcation by Doppler ultrasound mapping 多普勒超声成像显示动脉分叉附近血流速度分布
Computers in Cardiology 1997 Pub Date : 1997-09-07 DOI: 10.1109/CIC.1997.647833
D. Adam, D. Givony
{"title":"Flow velocity distribution near the arterial bifurcation by Doppler ultrasound mapping","authors":"D. Adam, D. Givony","doi":"10.1109/CIC.1997.647833","DOIUrl":"https://doi.org/10.1109/CIC.1997.647833","url":null,"abstract":"A latex phantom of the carotid artery, with its bifurcation, was placed in a highly accurate measurement system. Steady, laminar flow was induced, and its velocity measured by Doppler UltraSound Mapping (DUSM). Orientation and location of the DUSM probe were registered concurrently, so as to allow calculation of the velocity vectorial components. Axial and non-axial components of the flow velocity vectors correlated well (>0.99) with calculated values. The low SD (2.3 cm/sec for axial flow, 0.63 degrees for the angle of the non-axial component), allowed calculating the axial flow velocity distribution at the bifurcation, and its deviation from symmetry. An index of asymmetry changed from 'normal' 115/spl plusmn/17 (for 6.0 and 4.0 mm branches) to 79/spl plusmn/12 when the 6.0 mm branch was occluded. The changes increased for higher flow velocities.","PeriodicalId":228649,"journal":{"name":"Computers in Cardiology 1997","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131526345","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
Baroreflex sensitivity in cardiac patients with chronic congestive heart failure: towards a non invasive assessment method 慢性充血性心力衰竭患者的压力反射敏感性:一种无创评估方法
Computers in Cardiology 1997 Pub Date : 1997-09-07 DOI: 10.1109/CIC.1997.647866
R. Colombo, G. Mazzuero, P. Lanfranchi, G. Spinatonda, P. Giannuzzio, G. Minuco
{"title":"Baroreflex sensitivity in cardiac patients with chronic congestive heart failure: towards a non invasive assessment method","authors":"R. Colombo, G. Mazzuero, P. Lanfranchi, G. Spinatonda, P. Giannuzzio, G. Minuco","doi":"10.1109/CIC.1997.647866","DOIUrl":"https://doi.org/10.1109/CIC.1997.647866","url":null,"abstract":"Spectral analysis of RR interval and systolic arterial pressure variability was applied for the non invasive assessment of the baroreflex gain in Congestive Chronic Heart Failure (CNF). Forty-nine CHF patients were studied during rest, controlled breathing and head-up tilt. The alpha index, a noninvasive measure of the overall gain of the RR to systolic arterial pressure (SAP) relationship, and a modified version called beta, incorporating the weighted coherence function, were computed in the low (LF) and high (NF) frequency bands by spectral analysis, and compared with the phenylephrine test slope. A linear model fitted on the beta index values during rest and controlled breathing showed a high correlation (r=0.93, Standard error of the estimation=2.5 ms/mmHg) with the phenylephrine test slope. In severe CNF patients the beta index proposed, evaluated during rest and controlled breathing, may improve the baroreflex gain estimation and provide a noninvasive assessment method that might be useful in gauging prognosis.","PeriodicalId":228649,"journal":{"name":"Computers in Cardiology 1997","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133743351","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
Higher order generalized eigensystem and Tikhonov regularization techniques for inverse electrocardiography 逆心电图的高阶广义特征系统和Tikhonov正则化技术
Computers in Cardiology 1997 Pub Date : 1997-09-07 DOI: 10.1109/CIC.1997.647816
R. D. Thorne, L. Olson, T. Hrabik
{"title":"Higher order generalized eigensystem and Tikhonov regularization techniques for inverse electrocardiography","authors":"R. D. Thorne, L. Olson, T. Hrabik","doi":"10.1109/CIC.1997.647816","DOIUrl":"https://doi.org/10.1109/CIC.1997.647816","url":null,"abstract":"The authors have previously presented the generalized eigensystem (GES) approach as an alternative to truncated singular value decomposition and zero order Tikhonov regularization methods for the ill-conditioned inverse problem of electrocardiography. Here, they extend their comparison of GES with Tikhonov regularization utilizing higher order regularizers applied to a realistic heart/torso geometry with measured epicardial and body surface potentials. Utilizing higher order regularizers the results from Tikhonov regularization more closely match those of the GES techniques.","PeriodicalId":228649,"journal":{"name":"Computers in Cardiology 1997","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133889601","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
Edge detection in echocardiographic images based on differential tissue attenuation rates 基于组织衰减率差异的超声心动图图像边缘检测
Computers in Cardiology 1997 Pub Date : 1997-09-07 DOI: 10.1109/CIC.1997.647908
A. Hammoude
{"title":"Edge detection in echocardiographic images based on differential tissue attenuation rates","authors":"A. Hammoude","doi":"10.1109/CIC.1997.647908","DOIUrl":"https://doi.org/10.1109/CIC.1997.647908","url":null,"abstract":"A basic goal in the analysis of echocardiographic images is the detection of endocardial border points. The authors have implemented a new method of edge detection which is based on the differing attenuation rates of blood and myocardial tissue. At each point in the image, the average attenuation rates in the portions of tissue radically preceding and radially following the point are estimated by least-squares regression. If one of these rates is sufficiently close to that of blood, and other is sufficiently close to that of myocardium, then the point is flagged as an edge point. This paper describes how this method is implemented in software, and presents the results of applying the method to a set of sample images.","PeriodicalId":228649,"journal":{"name":"Computers in Cardiology 1997","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133186660","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
Synchronisation analysis of heart period variability signal based on corrected conditional entropy 基于修正条件熵的心期变异性信号同步分析
Computers in Cardiology 1997 Pub Date : 1997-09-07 DOI: 10.1109/CIC.1997.647845
A. Porta, G. Baselli, S. Guzzetti, R. Magatelli, N. Montano, C. Cogliati, A. Malliani, S. Cerutti
{"title":"Synchronisation analysis of heart period variability signal based on corrected conditional entropy","authors":"A. Porta, G. Baselli, S. Guzzetti, R. Magatelli, N. Montano, C. Cogliati, A. Malliani, S. Cerutti","doi":"10.1109/CIC.1997.647845","DOIUrl":"https://doi.org/10.1109/CIC.1997.647845","url":null,"abstract":"Regularity and synchronisation between different rhythms mainly at low (LF) and high frequency (HF) is evaluated in heart rate variability through conditional entropy (CE). CE quantifies the degree of information left after regular patterns have been removed. In short (about 300 points) data sequences CE is evaluated with a correction which considers as random the patterns that appear only one time and would otherwise be considered as regular. The minimum of the corrected CE (CCE) with increasing pattern length is chosen as the most reliable CE estimate. Beat-to-beat heart period series were analysed in 8 normal subjects at rest (R), head up tilt (T) and controlled respiration (CR). A significant decrease in CCE was found in T (0.9/spl plusmn/0.052) compared to R (1.01/spl plusmn/0.037); during CR, CCE displayed a slight and not significant increase (1.07/spl plusmn/0.055). The enhanced LF activity present in T seems to have a greater regularising power than the periodical input provided by CR at HF.","PeriodicalId":228649,"journal":{"name":"Computers in Cardiology 1997","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114352209","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
Feature extraction based method for the inverse solution of electrocardiography 基于特征提取的心电图反解方法
Computers in Cardiology 1997 Pub Date : 1997-09-07 DOI: 10.1109/CIC.1997.647938
Z. Cserjes, V. Szathmáry, M. Tiňová, G. Kozmann, M. Tysler
{"title":"Feature extraction based method for the inverse solution of electrocardiography","authors":"Z. Cserjes, V. Szathmáry, M. Tiňová, G. Kozmann, M. Tysler","doi":"10.1109/CIC.1997.647938","DOIUrl":"https://doi.org/10.1109/CIC.1997.647938","url":null,"abstract":"The paper shows results of numerical and biological model studies related to a new inverse computation approach in electrocardiography. The method is based on linear prediction, which ables one to select the diagnostically informative moments from the heart electric activation. The information content of the measured body surface potential field at these moments is much higher than at the other times, so the algorithm can be counted as a feature extraction method.","PeriodicalId":228649,"journal":{"name":"Computers in Cardiology 1997","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121502829","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
Wavelet-based, inhomogeneous, near-lossless compression of ultrasound images of the heart 基于小波的，非均匀的，近乎无损的心脏超声图像压缩
Computers in Cardiology 1997 Pub Date : 1997-09-07 DOI: 10.1109/CIC.1997.647956
V. Vlahakis, R. Kitney
{"title":"Wavelet-based, inhomogeneous, near-lossless compression of ultrasound images of the heart","authors":"V. Vlahakis, R. Kitney","doi":"10.1109/CIC.1997.647956","DOIUrl":"https://doi.org/10.1109/CIC.1997.647956","url":null,"abstract":"With hospitals switching from film to digital storage of medical images, there is an ever increasing need for efficient image compression techniques. This paper presents a new approach to segmented coding of ultrasound images of the heart for inhomogeneous spatial reconstruction quality. The authors' method employs a geometric modelling technique to detect the useful image area from the background. Based on these results, they make use of a hybrid segmentation technique to isolate the anatomical structures of the heart in the presence of noise. Segmented structures are assigned importance according to their diagnostic content and compression is performed using the wavelet transform and entropy coding. The authors select the most important wavelet coefficients across scales. This involves the rejection of noise related coefficients and emphasizing on those carrying the bulk of the diagnostic information in the original image.","PeriodicalId":228649,"journal":{"name":"Computers in Cardiology 1997","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115984417","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: 11
Possible forms of heart-rate variability and their application: use of heart-rate variability in assessment of surgical patients 心率变异性的可能形式及其应用:心率变异性在外科病人评估中的应用
Computers in Cardiology 1997 Pub Date : 1997-09-07 DOI: 10.1109/CIC.1997.647911
T. Slonim, M. Slonim, G. Daychman, L. Roytblat, I. Ovsyshcher
{"title":"Possible forms of heart-rate variability and their application: use of heart-rate variability in assessment of surgical patients","authors":"T. Slonim, M. Slonim, G. Daychman, L. Roytblat, I. Ovsyshcher","doi":"10.1109/CIC.1997.647911","DOIUrl":"https://doi.org/10.1109/CIC.1997.647911","url":null,"abstract":"A new approach has been proposed for the estimation of variables based on Heart Rate Variability during a surgical operation. The following variables, Heart Rate Variability Index, Normalized Inert Rate Variability Index and Integral Estimation have been introduced and used for the analysis and estimation of surgical procedures in 7 patients. All variables have a clear physical meaning; they are very different at various stages of the operation and facilitate the estimation of the complications of the operation.","PeriodicalId":228649,"journal":{"name":"Computers in Cardiology 1997","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115105209","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
Development of an electronic medical record for patient care in cardiology 心脏病患者护理电子病历的开发
Computers in Cardiology 1997 Pub Date : 1997-09-07 DOI: 10.1109/CIC.1997.648131
A. Taddei, C. Carpeggiani, M. Emdin, R. Balocchi, S. Dalmiani, Gabriele Cecchetti, A. Macerata, D. Pierotti, Carlo Marchesi
{"title":"Development of an electronic medical record for patient care in cardiology","authors":"A. Taddei, C. Carpeggiani, M. Emdin, R. Balocchi, S. Dalmiani, Gabriele Cecchetti, A. Macerata, D. Pierotti, Carlo Marchesi","doi":"10.1109/CIC.1997.648131","DOIUrl":"https://doi.org/10.1109/CIC.1997.648131","url":null,"abstract":"An electronic medical record system has been designed and developed with the aim of supporting patient care in the department of cardiology. A clinical information system was implemented to integrate the different heterogeneous sources of patient information. All the clinically relevant patient data were gathered in a timely way and stored in the clinical database. A viewer/editor of patient medical records was designed, addressing friendliness, flexibility and communication. The basic function for consultation is the time-oriented (weekly or daily) representation of patient parameters, care events and examinations. World Wide Web technology has been applied to implement the medical record. The system is currently under clinical evaluation.","PeriodicalId":228649,"journal":{"name":"Computers in Cardiology 1997","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115453615","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: 24
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