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Computers in Cardiology, 2005最新文献

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ECOPED: an informative system for pediatric echocardiography ecped:儿童超声心动图信息系统
Computers in Cardiology, 2005 Pub Date : 1900-01-01 DOI: 10.1109/CIC.2005.1588132
S. Dalmiani, P. Festa, L. A. Ali, A. Vellani, A. Taddei
{"title":"ECOPED: an informative system for pediatric echocardiography","authors":"S. Dalmiani, P. Festa, L. A. Ali, A. Vellani, A. Taddei","doi":"10.1109/CIC.2005.1588132","DOIUrl":"https://doi.org/10.1109/CIC.2005.1588132","url":null,"abstract":"Diagnosis of congenital heart disease in young patients represents a complex assessment of instrumental parameters and requires often a surgical procedure to correct structures morphologies and related functions. An information system for the management of echocardiographic examinations in patients with suspected or ascertained congenital heart disease, was developed in our departments of Pediatric Cardiology and Cardiac Surgery. This system uses a new model for workflow and clinical dataset collection. For each diagnostic related group, according to EACTS Congenital Database and European Pediatric Cardiology nomenclatures, was defined a set of relevant echocardiographic data to be collected (Pathology Related Dataset, PRD), in order to comply with a comprehensive diagnostic assessment of the patient","PeriodicalId":239491,"journal":{"name":"Computers in Cardiology, 2005","volume":"37 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":"127817384","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
Automating the determination of wave speed using the PU-loop method 使用pu环路方法自动测定波速
Computers in Cardiology, 2005 Pub Date : 1900-01-01 DOI: 10.1109/CIC.2005.1588099
M. Swalen, A. Khir
{"title":"Automating the determination of wave speed using the PU-loop method","authors":"M. Swalen, A. Khir","doi":"10.1109/CIC.2005.1588099","DOIUrl":"https://doi.org/10.1109/CIC.2005.1588099","url":null,"abstract":"The PU-loop (pressure-velocity loop) is a method for determining wave speed and relies on the linear relationship between the pressure and velocity in the absence of reflected waves. This linearity of the PU-loop during early systole, which is directly related to wave speed, has always been established by eye. This paper presents a new technique that establishes this linearity and thus determining wave speed online. Pressure and flow were measured in the ascending aorta of 11 anesthetised dogs. The slope of the PU-loop, indicating wave speed was determined by eye and by using the new technique. The difference between the slopes of the two methods is in the order of 3%. The new technique is convenient and allows for the online assessment of wave speed, which could be used as a bedside tool for the assessment of arterial compliance","PeriodicalId":239491,"journal":{"name":"Computers in Cardiology, 2005","volume":"86 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":"127919021","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
Competitive interactions between ectopic foci and reentry in virtual human atrium 虚拟人心房异位灶与再入的竞争相互作用
Computers in Cardiology, 2005 Pub Date : 1900-01-01 DOI: 10.1109/CIC.2005.1588037
H. Zhang, J. Liu, C. Garratt, A. Holden
{"title":"Competitive interactions between ectopic foci and reentry in virtual human atrium","authors":"H. Zhang, J. Liu, C. Garratt, A. Holden","doi":"10.1109/CIC.2005.1588037","DOIUrl":"https://doi.org/10.1109/CIC.2005.1588037","url":null,"abstract":"Atrial arrhythmias (flutter and fibrillation) are characterised by rapid and irregular activation of atrium. There are two possible mechanisms: abnormal spontaneous electrical activity of ectopic foci and multiple reentrant wavelets. In this study, we developed a biophysically detailed computer model of virtual human atrium to study the interaction between the two major arrhythmic origins. Depending on their frequencies, phases and distance, the interaction is competitive with either ectopic focus or reentry dominating atrial electrical excitation. Collisions between the two lead to further wave-breaks and the formation of multiple reentrant wavelets, providing a source for persistent atrial fibrillation. Focal activity acting as an organising centre, or mother motor which drives and controls the rhythm of reentry was observed","PeriodicalId":239491,"journal":{"name":"Computers in Cardiology, 2005","volume":"33 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":"128447941","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
Robust and efficient location of T-wave ends in electrocardiogram 稳健有效的心电图t波末端定位
Computers in Cardiology, 2005 Pub Date : 1900-01-01 DOI: 10.1109/CIC.2005.1588203
Q. Zhang, A. Manriquez, C. Médigue, Y. Papelier, M. Sorine
{"title":"Robust and efficient location of T-wave ends in electrocardiogram","authors":"Q. Zhang, A. Manriquez, C. Médigue, Y. Papelier, M. Sorine","doi":"10.1109/CIC.2005.1588203","DOIUrl":"https://doi.org/10.1109/CIC.2005.1588203","url":null,"abstract":"A new algorithm is proposed in this paper for T-wave end location in electrocardiogram (ECG). It mainly consists of the computation of an indicator related to the area covered by the T-wave curve and delimited in a special manner. Based on simple assumptions, essentially on the concavity of the T-wave form, it is proved that the maximum of the computed indicator inside each cardiac cycle coincides with the T-wave end. The algorithm is robust to measurement noise, to wave form morphological variations and to baseline wander. It is also computationally very simple: the main computation can be implemented as a simple finite impulse response (FIR) filter","PeriodicalId":239491,"journal":{"name":"Computers in Cardiology, 2005","volume":"306 2 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":"134220271","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
Comparison of similarity measures for clustering electrocardiogram complexes 聚类心电图复合体相似性度量的比较
Computers in Cardiology, 2005 Pub Date : 1900-01-01 DOI: 10.1109/CIC.2005.1588215
K. Chang, R. Lee, C. Wen, M. Yeh
{"title":"Comparison of similarity measures for clustering electrocardiogram complexes","authors":"K. Chang, R. Lee, C. Wen, M. Yeh","doi":"10.1109/CIC.2005.1588215","DOIUrl":"https://doi.org/10.1109/CIC.2005.1588215","url":null,"abstract":"This paper compares four similarity measures such as the city block (L1-norm), the Euclidean (L2-norm), the normalized correlation coefficient, and the simplified gray relational grade for clustering QRS complexes. Performances of the measures include classification accuracy, threshold value selection, noise robustness, and execution time. The clustering algorithm used is the so-called two-step unsupervised method. The best out of the 10 independent runs of the clustering algorithm with randomly selected initial template beat for each run is used to compare the performances of each similarity measure. Simulation results show that the simplified gray relational grade outperforms the other measures","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":"134592141","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: 13
The assessment of blood pressure in atrial fibrillation 房颤患者血压的评估
Computers in Cardiology, 2005 Pub Date : 1900-01-01 DOI: 10.1109/CIC.2005.1588093
V.S. Kaliujnaya, Si Kalyuzhny
{"title":"The assessment of blood pressure in atrial fibrillation","authors":"V.S. Kaliujnaya, Si Kalyuzhny","doi":"10.1109/CIC.2005.1588093","DOIUrl":"https://doi.org/10.1109/CIC.2005.1588093","url":null,"abstract":"For the first time the principles of evaluation of the blood pressure levels in atrial fibrillation have been suggested. They reflect absolutely precisely the degree of haemodynamic disturbances in atrial fibrillation and they can be used as the criteria for assessment of these patients treatment effectiveness. A new non-invasive modified method of blood pressure measurement in atrial fibrillation is suggested and it can estimate all the spectrum of fluctuation blood pressure in cardiac arrhythmia. The accuracy of this method is equal to the invasive direct method. The simplicity of modified method allows us to recommend it to the physicians for measuring the blood pressure in patients with atrial fibrillation. Nowadays the modified auscultative method of blood pressure measurement represents itself as exclusive and the most informative method. The described principle of blood pressure measurement in atrial fibrillation should serve the basis for computerized systems","PeriodicalId":239491,"journal":{"name":"Computers in Cardiology, 2005","volume":"37 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":"132113912","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
The university of glasgow (Uni-G) ECG analysis program 格拉斯哥大学(Uni-G)心电图分析程序
Computers in Cardiology, 2005 Pub Date : 1900-01-01 DOI: 10.1109/CIC.2005.1588134
Peter W. Macfarlane, B. Devine, E. Clark
{"title":"The university of glasgow (Uni-G) ECG analysis program","authors":"Peter W. Macfarlane, B. Devine, E. Clark","doi":"10.1109/CIC.2005.1588134","DOIUrl":"https://doi.org/10.1109/CIC.2005.1588134","url":null,"abstract":"The University of Glasgow 12/15 lead ECG analysis program has been in continuous development for over 20 years. It has been adapted to meet the needs of different users and keep abreast of changes in terminology as well as new morphological features described in the literature. It is applicable to neonates as well as adults and takes account of racial variation in wave amplitudes. It has a capability for comparing serially recorded ECGs using one of two different approaches. The many varying features of the software have led to the introduction of the descriptor Uni-G (unique) ECG analysis program","PeriodicalId":239491,"journal":{"name":"Computers in Cardiology, 2005","volume":"33 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":"121373952","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: 123
A statistical model of the sleep-wake dynamics of the cardiac rhythm 心律的睡眠-觉醒动力学的统计模型
Computers in Cardiology, 2005 Pub Date : 1900-01-01 DOI: 10.1109/CIC.2005.1588170
P. McSharry, G. Clifford
{"title":"A statistical model of the sleep-wake dynamics of the cardiac rhythm","authors":"P. McSharry, G. Clifford","doi":"10.1109/CIC.2005.1588170","DOIUrl":"https://doi.org/10.1109/CIC.2005.1588170","url":null,"abstract":"The beat-to-beat heart rate varies considerably over the course of 24 hours. The Computers in Cardiology Challenge of 2002 was based on understanding and modelling the dynamics of the source of this variation. The diverse range of entries for simulating the RR tachogram emphasises the level of ambiguity that exists when attempting to model the cardiovascular system over long time scales. In 2002, a model that combined both deterministic and stochastic descriptions of the data generating process was developed to reproduce both short term variations and long range correlations in RR intervals. In this paper these ideas are extended and new observations of sleep-wake transitions observed during sleep are incorporated. The new model more faithfully represents some of the key empirical characteristics that have been observed in actual recordings of healthy human subjects from the Physionet database. These characteristics include the distribution of RR intervals during wake and sleep periods. In particular the model emulates the existence of a scale-free power law distribution during wakefulness and the exponential distribution (with a characteristic time scale) of sleep-wake activity during prolonged sleep. Concurrence with real data is demonstrated using detrended fluctuation analysis and multiscale entropy. In order to increase the model's utility for assessing biomedical signal processing methods applied to the RR interval time series, a label for each beat is available as either normal, ectopic or artifactual. Furthermore, a state label (wake or sleep) is available","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":"128469898","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
From 2D to 4D in quantitative left ventricle wall motion analysis of biplanar X-ray angiograms 双平面x线血管造影左心室壁二维至四维运动定量分析
Computers in Cardiology, 2005 Pub Date : 1900-01-01 DOI: 10.1109/CIC.2005.1588272
R. Swoboda, M. Carpella, C. Steinwender, C. Gabriel, F. Leisch, W. Backfrieder
{"title":"From 2D to 4D in quantitative left ventricle wall motion analysis of biplanar X-ray angiograms","authors":"R. Swoboda, M. Carpella, C. Steinwender, C. Gabriel, F. Leisch, W. Backfrieder","doi":"10.1109/CIC.2005.1588272","DOIUrl":"https://doi.org/10.1109/CIC.2005.1588272","url":null,"abstract":"Accurate assessment of regional myocardial function after infarction is a challenging task in biplanar X-ray cine-angiography. An estimate of motion is given by tracking contours of the left ventricle (LV) in projection images. In conventional clinical practice, LV wall motion analysis is done in 2D, based on end-diastolic and end-systolic contours. Our work, by contrast, presents novel methods for analyzing left ventricular motion in 4D, making possible the evaluation of myocardial function in any region of the ventricle rather than at artificial boundary areas in the projection image. 4D LV models are reconstructed from a biplanar image sequence. The centerline and radial method, originally developed for analysis in 2D, are extended to 3D for assessment of cardiac motion based on our 4D ventricular model. Color-encoded ventricle models and 2D maps of heart wall dynamics are developed for visualization. Results obtained by using the methods presented herein are in correspondence with clinical findings","PeriodicalId":239491,"journal":{"name":"Computers in Cardiology, 2005","volume":"322 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":"116820291","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
A variable step size LMS algorithm for the suppression of the CPR artefact from a VF signal 一种可变步长LMS算法，用于从VF信号中抑制CPR伪影
Computers in Cardiology, 2005 Pub Date : 1900-01-01 DOI: 10.1109/CIC.2005.1588065
U. Irusta, S. de Gauna, J. Ruiz, E. Aramendi, A. Lazkano, J. Gutierrez
{"title":"A variable step size LMS algorithm for the suppression of the CPR artefact from a VF signal","authors":"U. Irusta, S. de Gauna, J. Ruiz, E. Aramendi, A. Lazkano, J. Gutierrez","doi":"10.1109/CIC.2005.1588065","DOIUrl":"https://doi.org/10.1109/CIC.2005.1588065","url":null,"abstract":"Artefacts created by thoracic compressions during cardiopulmonary resuscitation (CPR) prevent the proper classification of the cardiac rhythm by an automatic external defibrillator (AED), making a pause in CPR necessary for a correct rhythm analysis. Previously proposed adaptive filtering methods have produced satisfactory CPR cancellation results but involve complex out of hospital intervention scenarios. A new adaptive method requiring minimal modifications of the basic operation of an AED is proposed for the suppression of the CPR artefact from a ventricular fibrillation (VF) rhythm. A model of the CPR artefact, based on the instants of the thoracic compressions, is used as the reference signal of a variable step size least mean squares (LMS) algorithm. Emphasis is put on building a reference signal highly correlated to the CPR artefact and on the fine tuning of the LMS algorithm. Satisfactory results have been obtained for the average increase in signal to noise ratio (SNR) and the sensitivity of a commercially available AED","PeriodicalId":239491,"journal":{"name":"Computers in Cardiology, 2005","volume":"25 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":"116828857","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
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