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Computers in Cardiology, 2005最新文献

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Online measurement of the vasodilation of peripheral arteries on ultrasound images 外周动脉血管舒张超声图像的在线测量
Computers in Cardiology, 2005 Pub Date : 1900-01-01 DOI: 10.1109/CIC.2005.1588220
E. Bianchini, R. Andrei, F. Faita, V. Gemignani, Y. Plantinga, M. Demi
{"title":"Online measurement of the vasodilation of peripheral arteries on ultrasound images","authors":"E. Bianchini, R. Andrei, F. Faita, V. Gemignani, Y. Plantinga, M. Demi","doi":"10.1109/CIC.2005.1588220","DOIUrl":"https://doi.org/10.1109/CIC.2005.1588220","url":null,"abstract":"The online measurement of the vasodilation of a peripheral artery is useful in many clinical applications. Moreover, ultrasound imaging is recommended because of the advantages of this technique such as non-invasivity and feasibility. However, an algorithm with a subpixel resolution is required to obtain a useful plot of the vasodilation when using ultrasound images since the temporal changes of the vascular diameter on these images are usually not greater than 1-2 pixels. The algorithm we propose in this paper is based on the first absolute central moment, a mathematical operator which is used as an edge detector. The performances of the algorithm are analysed both on test discontinuities and on the online analysis of the brachial artery in in-vivo studies","PeriodicalId":239491,"journal":{"name":"Computers in Cardiology, 2005","volume":"81 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121913465","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
Role of sinus node during atrial fibrillation : a novel insight from regional frequency analysis 窦结在房颤中的作用:来自区域频率分析的新见解
Computers in Cardiology, 2005 Pub Date : 1900-01-01 DOI: 10.1109/CIC.2005.1588035
H. Tso, T. Kao, Y. Lin, C. Tai, S.A. Chen
{"title":"Role of sinus node during atrial fibrillation : a novel insight from regional frequency analysis","authors":"H. Tso, T. Kao, Y. Lin, C. Tai, S.A. Chen","doi":"10.1109/CIC.2005.1588035","DOIUrl":"https://doi.org/10.1109/CIC.2005.1588035","url":null,"abstract":"The sinus node (SAN) is demonstrated to play a role in the genesis and the perpetuation of atrial fibrillation (AF). The sinus activation during AF is difficult to analyze with conventional electrogram recordings. The purpose of this study was to investigate the atrial substrate characteristics near the sinus node (SAN) during sinus rhythm (SR), ongoing AF and before AF termination according to the frequency analysis compared to the rest of the right atrium (RRA). The present study included 6 patients with paroxysmal AF underwent noncontact mapping for the right atrium (RA). After subtraction of QRS-T complex, regional frequency distribution was obtained from the signals of 256-equally distribution mapping site for three situations. The dominant frequency (DF), power amplitude (MP), and organization index (OI) of DF between SAN and RRA during AF were similar (p>0.1). However, the DF of SAN area became lower (p<0.001), the power amplitude of local spectra (p<0.005) was higher, and more organization (P<0.001) compared to RRA before termination of AF. In conclusion, atrial substrate around the SAN is characterized by slower atrial activity compared to the rest of the right atrium during termination of AF. The frequency analysis showed that the DF around SAN area during AF termination was similar to during SR, suggesting that the sinus automaticity was preserved with local entrance block from the rest of the atrium","PeriodicalId":239491,"journal":{"name":"Computers in Cardiology, 2005","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126026692","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
Evaluation of a root mean squared based ischemia detector on the long-term ST database with body position change cancellation 基于均方根的体位变化消除长期ST数据库缺血检测器的评价
Computers in Cardiology, 2005 Pub Date : 1900-01-01 DOI: 10.1109/CIC.2005.1588239
A. Mincholé, B. Skarp, F. Jager, P. Laguna
{"title":"Evaluation of a root mean squared based ischemia detector on the long-term ST database with body position change cancellation","authors":"A. Mincholé, B. Skarp, F. Jager, P. Laguna","doi":"10.1109/CIC.2005.1588239","DOIUrl":"https://doi.org/10.1109/CIC.2005.1588239","url":null,"abstract":"In this work we revisit an ischemia detector based on the root mean square (RMS) series of the repolarization interval developed and validated using the European Society of cardiology ST-T database (ESCDB). This detector, developed within this database framework, gets sensitivity (S)/positive predictivity (+P) performance figures of 85%/86%. Our aim now is to re-evaluate the detector in the much richer long-term ST database where ST episodes of different origin are present, making a much more challenging scenario for the detector. Just a straight forward adaptation of the RMS detector reduces its performance figures, S/+P, to 70%/68%. This, apart from other reasons, is a consequence of the presence in the database of ST episodes generated by body position changes (BPC) which can be misinterpreted. A BPC detector incorporated to the previous detector noticeably improves the figures up to 75%/71%","PeriodicalId":239491,"journal":{"name":"Computers in Cardiology, 2005","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128478081","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
Modeling and simulation of transmural cellular electromechanical properties in heart failure 心力衰竭跨壁细胞机电特性的建模与仿真
Computers in Cardiology, 2005 Pub Date : 1900-01-01 DOI: 10.1109/CIC.2005.1588183
Yu Zhang, Guo-fa Shou, Rui Huang, L. Xia
{"title":"Modeling and simulation of transmural cellular electromechanical properties in heart failure","authors":"Yu Zhang, Guo-fa Shou, Rui Huang, L. Xia","doi":"10.1109/CIC.2005.1588183","DOIUrl":"https://doi.org/10.1109/CIC.2005.1588183","url":null,"abstract":"In this paper, we present a simulation study of transmural cellular electromechanical properties in heart failure based on a integrated and refined heart cell model of Luo-Rudy II model and modified Hunter-McCullochter Keurs mechanical model. The results show that prolonged action potential duration (APD) and APD rate-adaptation are more obviously transmurally heterogeneous in heart failure than those in control hearts. The results suggest that the differences of the electrical responses between failing cells and normal cells can cause slowing relaxation of the Ca2+ transient, and the difference of the Ca2+-TnC concentrations between fast and slow myocytes in failing hearts is smaller than in nonfailing hearts. It results in a decrease of force, which might diminish the role of mechanoelectric feedback, and then induce an increase of transmural APD gradient that might cause arrhythmia in heart failure. These results are in good accordance with experimental findings reported in the literatures and this electromechanical cardiac cell model might be very useful for further modeling and simulation of heart failure at both the tissue and the whole organ levels","PeriodicalId":239491,"journal":{"name":"Computers in Cardiology, 2005","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124669593","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 comparison of continuous wavelet transform and modulus maxima analysis of characteristic ECG features 连续小波变换与模极大值分析心电特征的比较
Computers in Cardiology, 2005 Pub Date : 1900-01-01 DOI: 10.1109/CIC.2005.1588214
I. Legarreta, P. Addison, N. Grubb, G. Clegg, C. Robertson, J. N. Watson
{"title":"A comparison of continuous wavelet transform and modulus maxima analysis of characteristic ECG features","authors":"I. Legarreta, P. Addison, N. Grubb, G. Clegg, C. Robertson, J. N. Watson","doi":"10.1109/CIC.2005.1588214","DOIUrl":"https://doi.org/10.1109/CIC.2005.1588214","url":null,"abstract":"The continuous wavelet transform (CWT) offers a valuable tool for the analysis of signals as it provides precise location in time of high frequency components. The selection of a mother wavelet with high correlation with the signal under study provides a more accurate time-frequency analysis. Continuous wavelet transform modulus maxima (CWTMM) reduce the computational requirement by representing only the pertinent information contained within the scalogram obtained from continuous wavelet analysis. This new domain has an easy interpretation and offers a useful tool for the automatic characterization of the different components observed in the ECG in health and disease. The aim of this work was to compare the two time-frequency domains for ECG analysis: CWT and CWTMM, providing example applications of both methods","PeriodicalId":239491,"journal":{"name":"Computers in Cardiology, 2005","volume":"76 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131479746","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
Cluster headache patients have normal circadian and sleep time autonomic nervous system function 丛集性头痛患者有正常的昼夜节律和睡眠时间自主神经系统功能
Computers in Cardiology, 2005 Pub Date : 1900-01-01 DOI: 10.1109/CIC.2005.1588087
A. Baharav, Z. Shinar, S. Akselrod, A. Mosek, L. R. Davrath
{"title":"Cluster headache patients have normal circadian and sleep time autonomic nervous system function","authors":"A. Baharav, Z. Shinar, S. Akselrod, A. Mosek, L. R. Davrath","doi":"10.1109/CIC.2005.1588087","DOIUrl":"https://doi.org/10.1109/CIC.2005.1588087","url":null,"abstract":"Cluster headache (CH) is a rare form of primary headache of neurovascular origin causing severe pain attacks associated with autonomic changes. Attacks are more likely to occur during sleep. Time-frequency decomposition (TFD) of instantaneous heart rate variability (HRV) is widely accepted as a non-invasive tool of investigation of autonomic nervous function and was applied in the present study. Our goal was to estimate the autonomic features of CH patients and their connection to sleep. The study included 20 subjects belonging to 3 groups: (a) CH (active headache attacks, N=7); (b) Normal control (C, N=6); (c) patients with CH during a quiet period (QP, N=7). The study revealed similar circadian behaviour of all HRV variables and of the HR in all groups indicating normal changes in central autonomic function between daytime and sleep in CH. Increased overall VLF power in CH compared to normal subjects suggests increased vasomotor activity during active headache periods only","PeriodicalId":239491,"journal":{"name":"Computers in Cardiology, 2005","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130062630","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
What is the optimum window width when calculating the interaction between rr intervals and systolic pressure levels? 当计算rr间隔和收缩压水平之间的相互作用时，最佳窗口宽度是什么?
Computers in Cardiology, 2005 Pub Date : 1900-01-01 DOI: 10.1109/CIC.2005.1588237
E. Bowers, A. Murray
{"title":"What is the optimum window width when calculating the interaction between rr intervals and systolic pressure levels?","authors":"E. Bowers, A. Murray","doi":"10.1109/CIC.2005.1588237","DOIUrl":"https://doi.org/10.1109/CIC.2005.1588237","url":null,"abstract":"The ability to reliably measure phase between changes in heart rate and blood pressure is important when developing cardiovascular models. This study recorded 20 subjects breathing normally for periods of five minutes. RR intervals and systolic pressure (SP) levels were extracted from ECG and blood pressure signals. Phase was calculated using cross spectral analysis using four different windowing techniques. An analysis of variance showed that phase was not affected by windowing techniques. However, variance of phase reduced as window width reduced and the number of windows increased. We concluded that 5 Hanning windows of width 100 s (with 50% overlap) produce a good compromise between minimum variance and maximum frequency resolution","PeriodicalId":239491,"journal":{"name":"Computers in Cardiology, 2005","volume":"77 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125962018","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 computer-based guideline implementation system for cardiac rehabilitation screening 基于计算机的心脏康复筛查指南实施系统
Computers in Cardiology, 2005 Pub Date : 1900-01-01 DOI: 10.1109/CIC.2005.1588102
R. Goud, N. Peek, A. Strijbis, P. D. De Clercq, A. Hasman
{"title":"A computer-based guideline implementation system for cardiac rehabilitation screening","authors":"R. Goud, N. Peek, A. Strijbis, P. D. De Clercq, A. Hasman","doi":"10.1109/CIC.2005.1588102","DOIUrl":"https://doi.org/10.1109/CIC.2005.1588102","url":null,"abstract":"The Netherlands heart foundation recently released a new cardiac rehabilitation guideline. Concurrent with its development, a decision support system (DSS) was built to assist professionals in implementing the guideline in practice. The DSS was evaluated during a 6-week pilot study in four cardiac rehabilitation centers. The number of patients enrolled in the DSS during the pilot study was 134. Adherence to the guidelines on a patient level was 83% for rehabilitation goals, and 68% for rehabilitation therapies. After the pilot study several new functionalities were added to the system while other DSS parts of the system were slightly changed based on user advice. Currently, a large-scale cluster randomized trial is conducted in 38 Dutch hospitals to rigorously assess the effect of the DSS on guideline adherence","PeriodicalId":239491,"journal":{"name":"Computers in Cardiology, 2005","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125491372","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
A knowledge based home monitoring system for management and rehabilitation of cardiovascular patients 基于知识的心血管病人管理与康复家庭监测系统
Computers in Cardiology, 2005 Pub Date : 1900-01-01 DOI: 10.1109/CIC.2005.1588028
F. Braga, C. Forlani, M. Signorini
{"title":"A knowledge based home monitoring system for management and rehabilitation of cardiovascular patients","authors":"F. Braga, C. Forlani, M. Signorini","doi":"10.1109/CIC.2005.1588028","DOIUrl":"https://doi.org/10.1109/CIC.2005.1588028","url":null,"abstract":"A \"managed care\" model (prevention, diagnosis, therapy, admission, home assistance) has been realized to permit both a continuous patients check without hospitalization and a patients data archiving. An hardware and software architecture has been designed to manage the out-of-hospital treatments of patients with a moderate cardiovascular risk; as all the sensors built are wearable the cardio respiratory recording may have place during patients exercise program. Transmitted by wireless ECG has been automatically processed by \"windows media center\" through a multi parametric approach based on time and frequency (linear and non linear analysis) domain study. Advanced characteristics have been utilized by this monitoring prototype and different technologies, such as data acquisition, elaboration, on line transmission and Web-based data storage, have been integrated for knowledge management; in this way it is possible not only data real time visualization and collection but also a continuous patients management useful to improve life quality","PeriodicalId":239491,"journal":{"name":"Computers in Cardiology, 2005","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126804949","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
Non-invasive identification of the total peripheral resistance baroreflex impulse response from spontaneous hemodynamic variability 自发血流动力学变异性对外周总阻力的无创识别
Computers in Cardiology, 2005 Pub Date : 1900-01-01 DOI: 10.1109/CIC.2005.1588094
Y. Li, R. Elahi, R. Mukkamala
{"title":"Non-invasive identification of the total peripheral resistance baroreflex impulse response from spontaneous hemodynamic variability","authors":"Y. Li, R. Elahi, R. Mukkamala","doi":"10.1109/CIC.2005.1588094","DOIUrl":"https://doi.org/10.1109/CIC.2005.1588094","url":null,"abstract":"We propose a novel technique for identifying the impulse response characterizing the total peripheral resistance (TPR) baroreflex by mathematical analysis of spontaneous, beat-to-beat fluctuations in arterial blood pressure, cardiac output, and stroke volume. The technique may therefore provide a complete linear dynamic characterization of the TPR baroreflex during normal, closed-loop conditions from only non-invasive measurements. We then describe a theoretical evaluation of the technique against realistic beat-to-beat variability generated by a cardiovascular simulator whose actual dynamic properties were exactly known. We report that the technique accurately estimated the TPR baroreflex impulse response as well as other key cardiovascular parameters for a range of simulator parameter values","PeriodicalId":239491,"journal":{"name":"Computers in Cardiology, 2005","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126409917","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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