Computers in Cardiology, 2005最新文献_第6页

Content-adaptive signal and data in pervasive cardiac monitoring 泛在心脏监测中的内容自适应信号和数据

Computers in Cardiology, 2005 Pub Date : 1900-01-01 DOI: 10.1109/CIC.2005.1588232

P. Augustyniak

引用次数: 20

Discrimination between atrial flutter and atrial fibrillation by computing a flutter index 利用扑动指数判别心房扑动与心房颤动

Computers in Cardiology, 2005 Pub Date : 1900-01-01 DOI: 10.1109/CIC.2005.1588039

R. Fischer, G. Klein, B. Widiger, L. Hoy, C. Zywietz

引用次数: 3

Does body surface potential mapping (bspm) predict functional recovery in chronic ischemic myocardium after revascularization? 体表电位映射(bspm)能否预测慢性缺血心肌血运重建术后的功能恢复?

Computers in Cardiology, 2005 Pub Date : 1900-01-01 DOI: 10.1109/CIC.2005.1588073

Hj Bruns, A. Samol, P. Stolz, T. Schawe, F. Wenzelburger, T. Tjan, H. Scheld, G. Breithardt, T. Wichter, C. Vahlhaus

引用次数: 1

Effects of a persistent sodium current through mutated hnav1.5 sodium channels on intracellular ionic homeostasis in a ventricular cell model 通过突变的hnav1.5钠通道的持续钠电流对心室细胞模型中细胞内离子稳态的影响

Computers in Cardiology, 2005 Pub Date : 1900-01-01 DOI: 10.1109/CIC.2005.1588278

G. Christé, L. Restier, M. Chahine, P. Chevalier, M. Pásek

{"title":"Effects of a persistent sodium current through mutated hnav1.5 sodium channels on intracellular ionic homeostasis in a ventricular cell model","authors":"G. Christé, L. Restier, M. Chahine, P. Chevalier, M. Pásek","doi":"10.1109/CIC.2005.1588278","DOIUrl":"https://doi.org/10.1109/CIC.2005.1588278","url":null,"abstract":"In LQT3 patients, SCN5A mutations were found that lead to a small fraction of persistent hNav1.5 current. We explored the effects of such a change on the intracellular ionic homeostasis in a model of guinea-pig cardiac ventricular cell. At steady-state under 1 Hz stimulation, the presence of a persistent Na+ current (INap) with g Nap 0.02 ms/cm2 led to a prolongation of the action potential from 153 ms (control) to 223 ms and an increase of [Na +]i, diastolic and systolic [Ca2+]i and [Ca2+]SRup by 10%, 30%, 40% and 43%, respectively. These changes were larger at 3 Hz. Such intracellular Na+ and Ca2+ overload was not found when the action potential prolongation (to 222 ms at 1 Hz) was due to decreased IKr and IKs currents. The model with INap became arrhythmo genie when [K+]e was lowered from 5.4 to 5.0 mM, whereas control and low K+ current models did not produce arrhythmias even when [K+]e was 2.5 mM","PeriodicalId":239491,"journal":{"name":"Computers in Cardiology, 2005","volume":"240 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":"126267844","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

Confronting a cardiovascular system model with heart rate and blood pressure data 面对心率和血压数据的心血管系统模型

Computers in Cardiology, 2005 Pub Date : 1900-01-01 DOI: 10.1109/CIC.2005.1588169

P. McSharry, M. Mcguinness, A. Fowler

{"title":"Confronting a cardiovascular system model with heart rate and blood pressure data","authors":"P. McSharry, M. Mcguinness, A. Fowler","doi":"10.1109/CIC.2005.1588169","DOIUrl":"https://doi.org/10.1109/CIC.2005.1588169","url":null,"abstract":"The cardiovascular system may be investigated by observing fluctuations in the heart rate, blood pressure and rate of respiration. Its time evolution is governed by the baroreflex control mechanism, where the sympathetic and vagal nerves compete to increase and decrease the heart rate respectively. A nonlinear delay-differential equation model is constructed to describe this control mechanism and to explore the interactions between the heart rate and blood pressure. In this model, a time delay gives rise to the oscillations in the blood pressure known as Mayer waves. The model maintains an intrinsically stable heart rate in the absence of nervous control, and features baroreflex influence on both heart rate and peripheral resistance. The effect of respiratory sinus arrhythmia (RSA) is introduced using a sinusoidal driving component. Clinical recordings obtained by carefully controlling the rate and depth of respiration are used to test the suitability of the model for representing the complicated physiology of the cardiovascular system. The model is shown to be able to reproduce many of the empirical characteristics observed in these biomedical signals, including RSA, Mayer waves and synchronization. Key physiological parameters in the model, including the time delay and levels of sympathetic and vagal activity, could provide useful diagnostic information about the state of the cardiovascular system","PeriodicalId":239491,"journal":{"name":"Computers in Cardiology, 2005","volume":"129 19 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":"114146938","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: 14

Improving accuracy of atrial fibrillation detection in lossy ECG streams 提高有损心电流中房颤检测的准确性

Computers in Cardiology, 2005 Pub Date : 1900-01-01 DOI: 10.1109/CIC.2005.1588261

L. Kontothanassis, B. Logan

{"title":"Improving accuracy of atrial fibrillation detection in lossy ECG streams","authors":"L. Kontothanassis, B. Logan","doi":"10.1109/CIC.2005.1588261","DOIUrl":"https://doi.org/10.1109/CIC.2005.1588261","url":null,"abstract":"Continuous physiological monitoring is often the best available tool for detecting and treating asymptomatic, intermittent pathologies like Atrial Fibrillation. A particularly effective algorithm is based on the variance of inter-beat intervals. This algorithms relies on the detection of the QRS complex and is thus fairly robust to noise. Unfortunately, we find that the algorithm is very susceptible to lost data and can quickly degrade even when small parts of the ECG stream are missing. For home-based environments with small devices and wireless data transmission, data loss and noise are inevitable and as such an algorithm that is both robust to noise and lost data becomes necessary. In this paper we present a new Atrial Fibrillation detection algorithm that has the above stated desired qualities. We have run the original and the modified algorithms on a collection of patients from the Physionet database exhibiting Atrial Fibrillation. Even with data loss as little as 10% the original algorithm degrades rapidly and its output is only 2-3% similar to the no-loss case. The loss-conscious algorithm continues to provide output that is more than 90% similar to the no-loss case even for data loss rates as high as 30%","PeriodicalId":239491,"journal":{"name":"Computers in Cardiology, 2005","volume":"3 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":"121033941","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

Diurnal changes of heart rate and sympatho-vagal activity for temporal patterns of transient ischemia 心率和交感迷走神经活动对短暂性缺血时间模式的日变化

Computers in Cardiology, 2005 Pub Date : 1900-01-01 DOI: 10.1109/CIC.2005.1588240

A. Smrdel, F. Jager

引用次数: 1

Filtering noisy ECG signals using the extended kalman filter based on a modified dynamic ECG model 采用基于改进的动态心电模型的扩展卡尔曼滤波方法滤波噪声心电信号

Computers in Cardiology, 2005 Pub Date : 1900-01-01 DOI: 10.1109/CIC.2005.1588283

R. Sameni, M. Shamsollahi, C. Jutten, M. Babaie-zadeh

引用次数: 100

Automatic extraction of physiological features from vibro-acoustic heart signals: correlation with echo-doppler 心脏振动声信号生理特征的自动提取:与回声多普勒的相关性

Computers in Cardiology, 2005 Pub Date : 1900-01-01 DOI: 10.1109/CIC.2005.1588096

G. Amit, N. Gavriely, J. Lessick, N. Intrator

引用次数: 12

Automated decision support and guideline verification in clinical practice 临床实践中的自动化决策支持和指南验证

Computers in Cardiology, 2005 Pub Date : 1900-01-01 DOI: 10.1109/CIC.2005.1588115

R. Młynarski, G. Ilczuk, E. Piłat, A. Wakulicz-Deja, W. Kargul

引用次数: 8