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Computers in Cardiology 1997最新文献

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Specifying and representing temporal abstractions on clinical data by a query language based on the event calculus 通过基于事件演算的查询语言指定和表示临床数据的时间抽象
Computers in Cardiology 1997 Pub Date : 1997-09-07 DOI: 10.1109/CIC.1997.648129
L. Chittaro, Combi Carlo, E. Cervesato, R. Cervesato, F. Antonini–canterin, G. Nicolosi, D. Zanuttini
{"title":"Specifying and representing temporal abstractions on clinical data by a query language based on the event calculus","authors":"L. Chittaro, Combi Carlo, E. Cervesato, R. Cervesato, F. Antonini–canterin, G. Nicolosi, D. Zanuttini","doi":"10.1109/CIC.1997.648129","DOIUrl":"https://doi.org/10.1109/CIC.1997.648129","url":null,"abstract":"Presents a system for temporal abstraction of clinical data. This system was developed following an object-oriented approach, and adopting the event calculus (EC) as a temporal ontology. EC is a general theory of time and change based on the concepts of event and property: an event happens at a time point and initiates/terminates one (or more) properties, while a property holds during a time interval. Examples of abstract properties in our domain are parameter state (normal, high, low), and parameter trend (increasing, decreasing and stationary). The system was tested by evaluating time-stamped sequences of numeric echocardiographic parameters (e.g. ventricular diameters, Doppler flow velocities, valve-lumen areas, etc.) in different clinical conditions (e.g. myocardial infarction, valve disease, etc.). A suitable graphical representation of the performed temporal abstractions is also provided by the system.","PeriodicalId":228649,"journal":{"name":"Computers in Cardiology 1997","volume":"6 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":"123924511","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
A computerized multiparametric approach for the evaluation of cardiovascular risk in hypertensive patients 评价高血压患者心血管风险的计算机化多参数方法
Computers in Cardiology 1997 Pub Date : 1997-09-07 DOI: 10.1109/CIC.1997.647932
R. Bedini, D. Franchi, G. Palagi, A. Belardinelli, S. Ghione, L. Mezzasalma, A. Ripoli
{"title":"A computerized multiparametric approach for the evaluation of cardiovascular risk in hypertensive patients","authors":"R. Bedini, D. Franchi, G. Palagi, A. Belardinelli, S. Ghione, L. Mezzasalma, A. Ripoli","doi":"10.1109/CIC.1997.647932","DOIUrl":"https://doi.org/10.1109/CIC.1997.647932","url":null,"abstract":"In order to evaluate the factor of cardiovascular risk in hypertensive patients, the most common measured physiological parameter is the arterial blood pressure (BP), often leaving out of considerations other important cardiovascular parameters, such as mechanical arterial compliance. To better evaluate the inherent variability of blood pressure, with respect to the control of cardiovascular system and situational determinants, a computerised system has been developed. By means of a PC, equipped with a 12 bits A/D board, BP, heart rate patient voice and posture and external temperature have been acquired. The systolic, diastolic, and mean values of BP and the heart rate have been continuously, beat-to-beat, acquired with a Finapres, while ad hoc developed sensors have been used to acquire the other parameters. The signals, acquired in the different detected situations, have been processed by means of a software developed in LabView environment. A linear regression of systolic blood pressure and RR interval in agreement with the Karemaker equation, is carried out, evaluating the baroceptorial system sensitivity. The developed system may be usefully exploited in the investigation of the baroceptorial reflex and the of control mechanism of cardiovascular system. Moreover, the multiparametric accomplished analysis method could be used in the evaluation and in the setting up of pharmacological interventions.","PeriodicalId":228649,"journal":{"name":"Computers in Cardiology 1997","volume":"26 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":"115207745","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
Epicardial velocity estimation using wavelets 心外膜速度的小波估计
Computers in Cardiology 1997 Pub Date : 1997-09-07 DOI: 10.1109/CIC.1997.647902
R. J. Gaudette, D. Brooks, R. Macleod
{"title":"Epicardial velocity estimation using wavelets","authors":"R. J. Gaudette, D. Brooks, R. Macleod","doi":"10.1109/CIC.1997.647902","DOIUrl":"https://doi.org/10.1109/CIC.1997.647902","url":null,"abstract":"A wavelet-based method is introduced to estimate the spatially and temporally local velocity of both activation and recovery wavefronts in epicardial potential distributions recorded by a sensor array. The method takes advantage of the space/time link inherent in wavefront propagation. It is tested on simulated idealized wavefronts and on recorded canine data.","PeriodicalId":228649,"journal":{"name":"Computers in Cardiology 1997","volume":"219 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":"115983253","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
Modelling the shift of the low frequency component of heart rate variability 对心率变异性低频分量的移位进行建模
Computers in Cardiology 1997 Pub Date : 1997-09-07 DOI: 10.1109/CIC.1997.647919
B. Raymond, J. Mazumdar, D. Nandagopal
{"title":"Modelling the shift of the low frequency component of heart rate variability","authors":"B. Raymond, J. Mazumdar, D. Nandagopal","doi":"10.1109/CIC.1997.647919","DOIUrl":"https://doi.org/10.1109/CIC.1997.647919","url":null,"abstract":"The effects of passive tilt on the power spectrum of heart rate variability was studied in healthy subjects. A significant decrease from 0.10 to 0.087 Hz of the centre frequency of the low frequency component of the power spectrum was observed with tilt. In order to better understand the nature of this frequency shift, a multivariate model of the effects of respiration and blood pressure on heart rate was applied to data from one individual. The contribution to the LF component of the HRV power spectrum by blood pressure variations was found to be responsible for the frequency shift.","PeriodicalId":228649,"journal":{"name":"Computers in Cardiology 1997","volume":"23 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":"116023118","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
T-wave alternans spectral magnitude is sensitive to electrocardiographic beat alignment strategy t波交替谱幅值对心电图拍对策略敏感
Computers in Cardiology 1997 Pub Date : 1997-09-07 DOI: 10.1109/CIC.1997.648023
S. Narayan, G. Botteron, J.M. Smith
{"title":"T-wave alternans spectral magnitude is sensitive to electrocardiographic beat alignment strategy","authors":"S. Narayan, G. Botteron, J.M. Smith","doi":"10.1109/CIC.1997.648023","DOIUrl":"https://doi.org/10.1109/CIC.1997.648023","url":null,"abstract":"The authors studied the effect of beat alignment on the resolution of T-wave alternans (TWA). ECG leads I, avF and V1 were recorded during pacing in 23 patients, and QRS complexes aligned by (i) peak voltage, (ii) dot product, (ii) QRS fiducial, (iv) pacing artifact. TWA was computed as the T-wave power spectral sum at 0.5 cycles/beat. Fifteen patients had inducible ventricular tachycardia (VT) and 8 were non-inducible. From the latter group, 20/24 leads failed to exhibit TWA and were used to simulate alternans via a 1% augmentation of alternate STU segments. TWA was subsequently retrieved from 46%, 100%, 74% and 92% of simulations, with TWA ratios of 2.98, 5.02, 3.68, 4.49 with each alignment. Similar magnitude and sensitivity trends were seen in the VT group. Dot product beat alignment may optimize TWA detection and improve its utility in predicting VT risk.","PeriodicalId":228649,"journal":{"name":"Computers in Cardiology 1997","volume":"109 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":"127544133","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
A model study of the effect of non-transmural necroses on epicardial potential distributions 非跨壁坏死对心外膜电位分布影响的模型研究
Computers in Cardiology 1997 Pub Date : 1997-09-07 DOI: 10.1109/CIC.1997.647813
R. Hren, B. Horáček
{"title":"A model study of the effect of non-transmural necroses on epicardial potential distributions","authors":"R. Hren, B. Horáček","doi":"10.1109/CIC.1997.647813","DOIUrl":"https://doi.org/10.1109/CIC.1997.647813","url":null,"abstract":"In this study, the effect of localized nontransmural necroses on epicardial potential distributions (EPDs) has been investigated by means of a computer model of the human ventricular myocardium. The model features an anatomically accurate geometry, an intramural rotating anisotropy, and a physiologically accurate computational implementation of propagated excitation. The authors' findings agreed with those of experimental studies in a complete transient loss of one of the positive areas when the necrosis was located subepicardially, and in a transient gap in the expanding positive areas when the necrosis was located intramurally and subendocardially. This study represents the first step in simulating the effects of electrophysiological precursors to ventricular tachyarrhythmias on EPDs.","PeriodicalId":228649,"journal":{"name":"Computers in Cardiology 1997","volume":"168 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":"126948984","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
Localization of septal accessory pathways in WPW syndrome using simulated body surface potential maps as templates 以模拟体表电位图为模板定位WPW综合征中隔副通路
Computers in Cardiology 1997 Pub Date : 1997-09-07 DOI: 10.1109/CIC.1997.647817
Hren, Stroink, BM HorBCek
{"title":"Localization of septal accessory pathways in WPW syndrome using simulated body surface potential maps as templates","authors":"Hren, Stroink, BM HorBCek","doi":"10.1109/CIC.1997.647817","DOIUrl":"https://doi.org/10.1109/CIC.1997.647817","url":null,"abstract":"Body surface potential maps (BSPMs) recorded during the delta wave in patients suffering from Wolff-Parkinson-White (WPW) syndrome can facilitate the localization of the site of accessory pathways. This study investigated the value of an anatomically accurate model of the human ventricular myocardium in simulating BSPMs that can be used as templates for discriminating among septal preexcitation sites. Preexcitation sequences were initiated at 12 sites at different regions of the basal septum; for each sequence, the authors calculated BSPMs at 2-ms increments within the first 40 ms after the onset of preexcitation. By inspecting the dominant morphological features of BSPM patterns, the authors established clinically applicable criteria for distinguishing between left and right posteroseptal preexcitation sites, between intermediate septal and anteroseptal or posteroseptal preexcitation sites, and between left and right anteroseptal preexcitation sites.","PeriodicalId":228649,"journal":{"name":"Computers in Cardiology 1997","volume":"4 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":"125368604","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
PET software for measurement of left ventricular myocardial viability, enlargement and geometric distortion PET软件用于测量左心室心肌活力，放大和几何畸变
Computers in Cardiology 1997 Pub Date : 1997-09-07 DOI: 10.1109/CIC.1997.648145
T. Miller, R. Gropler
{"title":"PET software for measurement of left ventricular myocardial viability, enlargement and geometric distortion","authors":"T. Miller, R. Gropler","doi":"10.1109/CIC.1997.648145","DOIUrl":"https://doi.org/10.1109/CIC.1997.648145","url":null,"abstract":"The authors developed software to aid in the evaluation by positron emission tomography (PET) of critical determinants of improvement following re-vascularization including the amount of viable tissue, quantified from myocardial oxygen consumption, and left-ventricular (LV) cavity enlargement and LV geometry, determined from ECG-gated blood pool images. Viable and non-viable tissue are determined from polar displays by comparison with normal subjects. The LV is isolated on the blood pool studies by assignment of regions of interest on beating images in the short-, vertical long- and horizontal long-axes. LV size is then determined from the total number of voxels in the LV cavity. The geometry of the LV is assessed by a sphericity index representing the ratio of the measured LV volume to the volume of a sphere with diameter equal to the long-axis dimension of the actual ventricle. These measurements were validated by imaging of a plastic phantom and by patient studies.","PeriodicalId":228649,"journal":{"name":"Computers in Cardiology 1997","volume":"20 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":"114216494","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
Discrete wavelet analysis of the signal-averaged high-resolution electrocardiogram 信号平均高分辨率心电图的离散小波分析
Computers in Cardiology 1997 Pub Date : 1997-09-07 DOI: 10.1109/CIC.1997.648126
H. Kestler, H. Strey, H. Dickhaus, G. Palm, V. Hombach, M. Hoher
{"title":"Discrete wavelet analysis of the signal-averaged high-resolution electrocardiogram","authors":"H. Kestler, H. Strey, H. Dickhaus, G. Palm, V. Hombach, M. Hoher","doi":"10.1109/CIC.1997.648126","DOIUrl":"https://doi.org/10.1109/CIC.1997.648126","url":null,"abstract":"The purpose of this study was the evaluation of the discrete wavelet transformation (DWT) applied to signal-averaged high-resolution ECG signals with the aim of separating healthy volunteers and patients with coronary artery disease (CAD) and inducible ventricular tachycardia. Especially, the usefulness of the DWT to the determination of the QRS-duration (QRSD), which is the main parameter of the time-domain. Late potential analysis, was under investigation. Using DWT processing, the classification performance (leaving-one-out simulation) based on QRS duration increased by approximately 10% in accuracy (in each detail signal) as compared to the standard VLP analysis (51 healthy volunteers vs. 44 patients with coronary artery disease). This was due to an increase of sensitivity. The authors conclude that the type of bandpass filtering realized by DWT improves the extraction of pathological intra-QRS micropotentials in patients with malignant arrhythmias.","PeriodicalId":228649,"journal":{"name":"Computers in Cardiology 1997","volume":"14 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":"114416437","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
Topology supported finite element method analysis of catheter/guidewire navigation in reconstructed coronary arteries 拓扑支持有限元法分析冠状动脉导管/导丝在重建冠状动脉中的导航
Computers in Cardiology 1997 Pub Date : 1997-09-07 DOI: 10.1109/CIC.1997.647951
Y.P. Wang, C. Chui, Y. Cai, K. Mak
{"title":"Topology supported finite element method analysis of catheter/guidewire navigation in reconstructed coronary arteries","authors":"Y.P. Wang, C. Chui, Y. Cai, K. Mak","doi":"10.1109/CIC.1997.647951","DOIUrl":"https://doi.org/10.1109/CIC.1997.647951","url":null,"abstract":"Reports on a real-time finite element method (FEM) for the analysis of catheter and guidewire navigation in coronary arteries. A three-dimensional model of the coronary arterial tree is reconstructed from a professional model using Coordinate Measuring Machine (CMM) probing and the coronary anatomy is represented as a topologic hierarchy structure. Each segment of the vessel is associated only with its relative segments; i.e. parents and children. By doing so, the boundary checking of the catheter/guidewire in/outside the vessel is performed upon an optimized group of a small number segments and, therefore, has dramatically reduced the time for contact detection and subsequently the computation for catheter navigation. This approach has been applied to the authors' interventional cardiology simulator development.","PeriodicalId":228649,"journal":{"name":"Computers in Cardiology 1997","volume":"19 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":"124054559","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
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