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Computers in cardiology最新文献

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Polysomnographic sleep recording with simultaneously acquired 12 lead ECGs: a study for detection and validation of apnea related ECG changes 同时获得12导联心电图的多导睡眠图睡眠记录:一项检测和验证呼吸暂停相关心电图变化的研究
Computers in cardiology Pub Date : 2002-09-22 DOI: 10.1109/CIC.2002.1166837
C. Zywietz, B. Widiger, T. Penzel
{"title":"Polysomnographic sleep recording with simultaneously acquired 12 lead ECGs: a study for detection and validation of apnea related ECG changes","authors":"C. Zywietz, B. Widiger, T. Penzel","doi":"10.1109/CIC.2002.1166837","DOIUrl":"https://doi.org/10.1109/CIC.2002.1166837","url":null,"abstract":"The aim of our study was to investigate whether morphological ECG parameters are changed during sleep disorders, in particular during apnea. We have set up jointly with the sleep laboratory of Marburg University a new database with polysomnographic and simultaneously recorded 12 lead ECG data. Analyses results on single cases and on a data set of 9 patients are presented. They confirm our hypothesis that morphologic ECG parameters vary systematically with apnea phases. While mean values differences seem to be small between regular and apnea respiration, standard deviations of these parameters are marked. From a separate analysis of data for each type of apnea and a joint processing of heart rate variability we expect additional insight into the reasons for the morphologic ECG changes.","PeriodicalId":80984,"journal":{"name":"Computers in cardiology","volume":"1 1","pages":"573-576"},"PeriodicalIF":0.0,"publicationDate":"2002-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1109/CIC.2002.1166837","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"62181878","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
Comparison of segmentation methods for analysis of endocardial wall motion with real-time three-dimensional ultrasound 实时三维超声心内膜壁运动分析分割方法的比较
Computers in cardiology Pub Date : 2002-09-22 DOI: 10.1109/CIC.2002.1166846
E. Angelini, D. Hamming, S. Homma, J. Holmes, A. Laine
{"title":"Comparison of segmentation methods for analysis of endocardial wall motion with real-time three-dimensional ultrasound","authors":"E. Angelini, D. Hamming, S. Homma, J. Holmes, A. Laine","doi":"10.1109/CIC.2002.1166846","DOIUrl":"https://doi.org/10.1109/CIC.2002.1166846","url":null,"abstract":"This paper presents a new methodology for validation of endocardial surface segmentation with real-time three-dimensional (RT3D) ultrasound via analysis of ventricular anatomical shape and deformations. When comparing manual tracing and deformable model segmentation methods, we observe high correlation for volume quantification while 3D shapes show significant differences when directly compared by point matching. In the absence of real three-dimensional ground truth for screening of ventricular anatomy, this study aims to define new tests to compare segmented shapes and analyze their accuracy in the context of wall motion analysis. Endocardial surfaces are fitted with finite element modeling in spheroidal prolate coordinates and analysis is performed via construction of node parameter maps in time. Comparison of parameter maps for healthy volunteers and patients with abnormal wall motion are reported.","PeriodicalId":80984,"journal":{"name":"Computers in cardiology","volume":"1 1","pages":"609-612"},"PeriodicalIF":0.0,"publicationDate":"2002-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1109/CIC.2002.1166846","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"62182017","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: 9
Automatic classification and differentiation of atherosclerotic lesions in swine using IVUS and texture features 利用IVUS和纹理特征对猪动脉粥样硬化病变进行自动分类和鉴别
Computers in cardiology Pub Date : 2002-09-22 DOI: 10.1109/CIC.2002.1166719
P. Brathwaite, A. Nagaraj, B. Kane, D. McPherson, E. Dove
{"title":"Automatic classification and differentiation of atherosclerotic lesions in swine using IVUS and texture features","authors":"P. Brathwaite, A. Nagaraj, B. Kane, D. McPherson, E. Dove","doi":"10.1109/CIC.2002.1166719","DOIUrl":"https://doi.org/10.1109/CIC.2002.1166719","url":null,"abstract":"Our goal was to develop an automatic classification algorithm to differentiate between four common lesion types in atherosclerotic (AS) arteries: calcific (CAL), fibro-calcific (FBC), fibrous (FBR), and fibro-fatty (FBF). AS was induced in eight Yucatan miniswine. 22 femoral or carotid arteries were imaged with intravascular ultrasound using a pull-back procedure. Both 2D and 3D texture measures were used, followed by a principal components analysis to reduce dimension. The classifiers were applied to the test dataset, and the results were compared with two independent experts. There was no difference between the 2D and 3D classification of the CA and E1, and of the CA and E2 (ANOVA, F = 2.00). The difference between CA and E1 (or E2) was not larger than the difference between E1 and E2 for any lesion type (ANOVA, F = 0.76). We conclude that using 3D information in the classification scheme improved the algorithm's ability to correctly classify lesion type.","PeriodicalId":80984,"journal":{"name":"Computers in cardiology","volume":"1 1","pages":"109-112"},"PeriodicalIF":0.0,"publicationDate":"2002-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1109/CIC.2002.1166719","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"62179939","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
Automatic measurement of carotid diameter and wall thickness in ultrasound images 自动测量颈动脉直径和壁厚超声图像
Computers in cardiology Pub Date : 2002-09-22 DOI: 10.1109/CIC.2002.1166783
M. A. Gutierrez, P. E. Pilon, S. Lage, L. Kopel, R. T. Carvalho, Sergio Shiguemi Furuie
{"title":"Automatic measurement of carotid diameter and wall thickness in ultrasound images","authors":"M. A. Gutierrez, P. E. Pilon, S. Lage, L. Kopel, R. T. Carvalho, Sergio Shiguemi Furuie","doi":"10.1109/CIC.2002.1166783","DOIUrl":"https://doi.org/10.1109/CIC.2002.1166783","url":null,"abstract":"Carotid vessel ultrasound imaging is a reliable noninvasive technique to measure the arterial morphology. Lumen Diameter (LD), intima-media thickness (IMT) of the far wall, and plaque presence can be reliably determined using B-mode ultrasound. In order to measure the carotid IMT as well as any other more complex quantitative indices of vessel morphology, it is necessary to identify lumen-intima and media-adventitia borders in the ultrasound images. In this paper we describe an automatic approach to measure LD and IMT based on an active contour technique improved by a multiresolution analysis. The measurements of LD and IMT were compared to manual tracing of the vessels border in terms of coefficients of variability (CV) and correlation (R). The results have shown that the method is a reliable and reproducible way of assessing the LD and far wall IMT in the carotid artery.","PeriodicalId":80984,"journal":{"name":"Computers in cardiology","volume":"1 1","pages":"359-362"},"PeriodicalIF":0.0,"publicationDate":"2002-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1109/CIC.2002.1166783","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"62180864","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: 92
A computer modeling study of the localization of cardiac optical mapping at discrete depths below the tissue surface 组织表面以下离散深度心脏光学成像定位的计算机建模研究
Computers in cardiology Pub Date : 2002-09-22 DOI: 10.1109/CIC.2002.1166772
V. Ramshesh, J.H. Dumas, S. Knisley
{"title":"A computer modeling study of the localization of cardiac optical mapping at discrete depths below the tissue surface","authors":"V. Ramshesh, J.H. Dumas, S. Knisley","doi":"10.1109/CIC.2002.1166772","DOIUrl":"https://doi.org/10.1109/CIC.2002.1166772","url":null,"abstract":"Depth and radius of the region interrogated by cardiac optical mapping with a laser beam depend on photon travel inside the heart. It would be useful to limit range of depth and radius interrogated. Here the effects of a condensing lens to concentrate laser light at a target depth in the heart was modeled Monte Carlo computer simulations that incorporated a 0.55 NA lens in air and absorption and scattering of 488 nm laser light in 3-d cardiac tissue indicated the distribution of excitation light fluence. A subsequent computer simulation incorporating absorption and scattering of transmembrane voltage-sensitive fluorescence (669 nm) indicated locations in tissue from which fluorescence photons exiting the tissue surface originated The results indicate the heart can be interrogated at a discrete depth below the surface of myocardium with a condensing lens, although resolution is limited This may be applicable to laser scanner systems used for cardiac optical mapping.","PeriodicalId":80984,"journal":{"name":"Computers in cardiology","volume":"1 1","pages":"317-319"},"PeriodicalIF":0.0,"publicationDate":"2002-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1109/CIC.2002.1166772","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"62181074","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
Detection of central and obstructive sleep apnea in children using pulse transit time 应用脉搏传递时间检测儿童中枢性和阻塞性睡眠呼吸暂停
Computers in cardiology Pub Date : 2002-09-22 DOI: 10.1109/CIC.2002.1166826
J. Pagani, M. Villa, G. Calcagnini, E. Lombardozzi, F. Censi, S. Poli, P. Bartolini, V. Barbaro, R. Ronchetti
{"title":"Detection of central and obstructive sleep apnea in children using pulse transit time","authors":"J. Pagani, M. Villa, G. Calcagnini, E. Lombardozzi, F. Censi, S. Poli, P. Bartolini, V. Barbaro, R. Ronchetti","doi":"10.1109/CIC.2002.1166826","DOIUrl":"https://doi.org/10.1109/CIC.2002.1166826","url":null,"abstract":"The aim of this study was to validate the use of pulse transit time (PTT) as a method to monitor sleep apnea in children. PTT was estimated as the interval between the ECGR-wave and the point at which the pulse wave at the finger reached 50% amplitude. First, we assessed changes in the PTT during breathing against known resistances in 15 awake children; resistance was applied with a modified nose and mouth two-way nonrebreathing face mask, having the inhalation valve port fitted with drilled plastic cylinders of various diameters. Second, we analyzed 20 events of obstructive apnea and 90 events of central apnea during sleep in 10 children. Our data showed good correlation between the inspiratory effort and PTT oscillation amplitude. In addition, PTT oscillation amplitude tuned out to successfully discriminate central from obstructive apnea.","PeriodicalId":80984,"journal":{"name":"Computers in cardiology","volume":"1 1","pages":"529-532"},"PeriodicalIF":0.0,"publicationDate":"2002-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1109/CIC.2002.1166826","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"62181727","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
Ubiquitous mobile access to real-time patient monitoring data 无处不在的移动访问实时患者监测数据
Computers in cardiology Pub Date : 2002-09-22 DOI: 10.1109/CIC.2002.1166833
S. Nelwan, T. B. V. Dam, P. Klootwijk, Simon H. Meij
{"title":"Ubiquitous mobile access to real-time patient monitoring data","authors":"S. Nelwan, T. B. V. Dam, P. Klootwijk, Simon H. Meij","doi":"10.1109/CIC.2002.1166833","DOIUrl":"https://doi.org/10.1109/CIC.2002.1166833","url":null,"abstract":"An application \"Pocket WinView\" was developed for a Pocket PC personal digital assistant device, which allows remote access to near real-time physiological information from a patient monitor on a commercial handheld device (iPAQ, Pocket PC). The application provides continuous display of up to six monitored physiological waveforms and parameter values. Wireless communication can be established using Wireless LAN and general packet radio service (GPRS). Data is protected with hybrid public key encryption. User authentication is required every time the application is started. Patient data can also be stored on Compact Flash memory cards for data collection purposes. Additional integration with Web-based applications on the hospital intranet make it possible to combine the near realtime signals with previously recorded 12-lead ECGs, laboratory test results, and charting information.","PeriodicalId":80984,"journal":{"name":"Computers in cardiology","volume":"1 1","pages":"557-560"},"PeriodicalIF":0.0,"publicationDate":"2002-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1109/CIC.2002.1166833","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"62181787","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: 60
Beat-to-beat heart rate and QT interval variability in patients undergoing coronary artery bypass graft surgery 冠状动脉搭桥手术患者的单次心率和QT间期变异性
Computers in cardiology Pub Date : 2002-09-22 DOI: 10.1109/CIC.2002.1166859
S. Frljak, V. Avbelj, R. Trobec, B. Geršak
{"title":"Beat-to-beat heart rate and QT interval variability in patients undergoing coronary artery bypass graft surgery","authors":"S. Frljak, V. Avbelj, R. Trobec, B. Geršak","doi":"10.1109/CIC.2002.1166859","DOIUrl":"https://doi.org/10.1109/CIC.2002.1166859","url":null,"abstract":"Non-uniform recovery of myocardial excitability may be essential in triggering malignant ventricular tachycardia in patients after cardiac surgery. Beat-to-beat heart rate and QT interval variability was investigated in 27 patients scheduled for elective coronary artery bypass graft surgery (CABG) and 20 control subjects. 35 channel ECG was recorded for 6 minutes, followed by off line computer analysis. Heart rate interval duration, RR SD, QT SD and power spectra of RR variability were computed from 256-second stable heart rate and QT interval series using MECG software. Study showed that CABG caused increased QT interval variability in face of nearly constant or slowly changing heart rate, suggesting a loss of autonomic coupling between heart rate and ventricular repolarization for sympathovagal modulation.","PeriodicalId":80984,"journal":{"name":"Computers in cardiology","volume":"1 1","pages":"661-664"},"PeriodicalIF":0.0,"publicationDate":"2002-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1109/CIC.2002.1166859","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"62181854","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
The response of intact guinea pigs to AC leakage currents 完整豚鼠对交流漏电流的反应
Computers in cardiology Pub Date : 2002-09-22 DOI: 10.1109/CIC.2002.1166876
S. Patel, R. Malkin
{"title":"The response of intact guinea pigs to AC leakage currents","authors":"S. Patel, R. Malkin","doi":"10.1109/CIC.2002.1166876","DOIUrl":"https://doi.org/10.1109/CIC.2002.1166876","url":null,"abstract":"There was a difference in the standard for leakage current in the US and Europe. This difference existed largely because there was very little data on AC stimulation of the heart in situ. In this study, we examine AC stimulation of the intact guinea pig. Nine male guinea pigs were anesthetized with isoflurane, intubated and monitored with the lead II ECG and optical plethysmograph. For AC stimulation, a stainless steel electrode was used The return electrode was applied to the right rear paw. Five seconds of AC stimuli at various frequencies was used The minimum VF threshold in these animals was found to be 558/spl plusmn/314 /spl mu/A at 100 Hz. Frequencies both below (20 Hz: 1584/spl plusmn/753 /spl mu/A) and above (160 Hz: 1355/spl plusmn/1007 pA) were found to be significantly different from 100 Hz (20 Hz: p=0.0017 and 100 Hz: p=0.0085). By contrast the minimum current required to have any effect on the heart only increased with frequency from 10 Hz (119/spl plusmn/53 pA), to 160 Hz (183/spl plusmn/50 pA, p<0. 0001).","PeriodicalId":80984,"journal":{"name":"Computers in cardiology","volume":"86 1","pages":"729-731"},"PeriodicalIF":0.0,"publicationDate":"2002-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1109/CIC.2002.1166876","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"62182755","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
A computerized fuzzy logic system for evaluation of the cardiovascular autonomic function based on multiple functional tests 基于多项功能测试的心血管自主功能评价计算机模糊逻辑系统
Computers in cardiology Pub Date : 2002-09-22 DOI: 10.1109/CIC.2002.1166735
H. Carvalho, L. F. Junqueira, J. Souza-Neto
{"title":"A computerized fuzzy logic system for evaluation of the cardiovascular autonomic function based on multiple functional tests","authors":"H. Carvalho, L. F. Junqueira, J. Souza-Neto","doi":"10.1109/CIC.2002.1166735","DOIUrl":"https://doi.org/10.1109/CIC.2002.1166735","url":null,"abstract":"The interest in the study of the Autonomic Nervous System has grown in the last years, mainly because of its important participation in the cardiovascular regulation and in many pathophysiological processes like heart failure, arrhythmias and sudden death. A great variety of tests have been employed for the functional evaluation of the Cardiovascular Autonomic Nervous System. However, the existence of variables with non-linear characteristics has made difficult the analysis of the responses. Based on this fact and considering that the Fuzzy Logic has been actually used with success in the development of classifier and analysis of control systems, its use in the investigation of the Cardiovascular Autonomic Function seems to be justified and a promise. The present paper describes the development of a system based on fuzzy logic to evaluate simultaneous cardiovascular autonomic tests results.","PeriodicalId":80984,"journal":{"name":"Computers in cardiology","volume":"1 1","pages":"173-176"},"PeriodicalIF":0.0,"publicationDate":"2002-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1109/CIC.2002.1166735","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"62180469","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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