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Uni- and multi-variate coherence function: Utility and misconceptions 单变量和多变量相干函数:效用和误解
2014 8th Conference of the European Study Group on Cardiovascular Oscillations (ESGCO) Pub Date : 2014-05-25 DOI: 10.1109/ESGCO.2014.6847551
R. Panerai, E. Katsogridakis, D. Simpson
{"title":"Uni- and multi-variate coherence function: Utility and misconceptions","authors":"R. Panerai, E. Katsogridakis, D. Simpson","doi":"10.1109/ESGCO.2014.6847551","DOIUrl":"https://doi.org/10.1109/ESGCO.2014.6847551","url":null,"abstract":"The coherence function (CF) is often used to assess the significance of linear relationships between cardiovascular variables, but the literature on applications to baroreceptor sensitivity and dynamic cerebral autoregulation studies shows statistical limitations in its validation. As a consequence, biases can be introduced due to rejection of useful data and/or study participants. Multivariate analysis can extend the utility of CF by allowing the identification of the main variables contributing to complex regulatory control mechanisms and also as a necessary step in the analysis of nonlinear systems.","PeriodicalId":385389,"journal":{"name":"2014 8th Conference of the European Study Group on Cardiovascular Oscillations (ESGCO)","volume":"118 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125058206","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
Asymmetry of haemodynamic variability in healthy people 健康人血流动力学变异性的不对称性
2014 8th Conference of the European Study Group on Cardiovascular Oscillations (ESGCO) Pub Date : 2014-05-25 DOI: 10.1109/ESGCO.2014.6847553
P. Guzik, J. Piskorski, Jerzy Ellert, T. Krauze
{"title":"Asymmetry of haemodynamic variability in healthy people","authors":"P. Guzik, J. Piskorski, Jerzy Ellert, T. Krauze","doi":"10.1109/ESGCO.2014.6847553","DOIUrl":"https://doi.org/10.1109/ESGCO.2014.6847553","url":null,"abstract":"Heart rate asymmetry is caused by an unequal contribution of heart rate decelerations and accelerations to the heart rate variability, structure and complexity. Here we show that the variability of different haemodynamic parameters such as stroke volume (SV), cardiac output (CO) and systemic vascular resistance (SVR) has asymmetrical properties. For this purpose we used 30-minute cardiac impedance recordings with beat-to-beat values of SV, CO and SVR from 99 healthy young volunteers. The increases of haemodynamic parameters present significantly different contributions to the short-term, long-term and total variability as well as the number of such increases is different from decreases. Haemodynamics such as SV, CO and SVR are additional examples of cardiovascular time series presenting asymmetrical properties of their variability. Our results suggest that asymmetry of cardiovascular time series is rather a general physiological phenomenon. The clinical value of these findings requires further investigation.","PeriodicalId":385389,"journal":{"name":"2014 8th Conference of the European Study Group on Cardiovascular Oscillations (ESGCO)","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122013481","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
The heart as a chronotaxic system — Why its rate variability is both complex and simple: Theory and analysis methods 心脏作为一个慢速系统-为什么它的速率变异性既复杂又简单:理论和分析方法
2014 8th Conference of the European Study Group on Cardiovascular Oscillations (ESGCO) Pub Date : 2014-05-25 DOI: 10.1109/ESGCO.2014.6847589
Philip T. Clemson, Yevhen F. Suprunenko, T. Stankovski, A. Stefanovska
{"title":"The heart as a chronotaxic system — Why its rate variability is both complex and simple: Theory and analysis methods","authors":"Philip T. Clemson, Yevhen F. Suprunenko, T. Stankovski, A. Stefanovska","doi":"10.1109/ESGCO.2014.6847589","DOIUrl":"https://doi.org/10.1109/ESGCO.2014.6847589","url":null,"abstract":"The heart rate variability (HRV) is analysed under the framework of a new class of self-sustained oscillators known as chronotaxic systems. These oscillators have time-varying frequencies that can be perturbed by noise but remain stable, resulting in dynamics that can appear both complex and simple. Methods developed for the inverse approach to these systems are applied to an HRV signal recorded under quasi-periodically forced respiration. The analysis suggests that the respiratory-related oscillation in the signal has the properties of a chronotaxic oscillator and an addition to an existing HRV model is proposed.","PeriodicalId":385389,"journal":{"name":"2014 8th Conference of the European Study Group on Cardiovascular Oscillations (ESGCO)","volume":"118 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121198831","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
Individual difference in baroreceptor sensitivity between increasing and decreasing blood pressure sequences 血压升高和降低序列间压力感受器敏感性的个体差异
2014 8th Conference of the European Study Group on Cardiovascular Oscillations (ESGCO) Pub Date : 2014-05-25 DOI: 10.1109/ESGCO.2014.6847569
D. Simpson, A. Beda
{"title":"Individual difference in baroreceptor sensitivity between increasing and decreasing blood pressure sequences","authors":"D. Simpson, A. Beda","doi":"10.1109/ESGCO.2014.6847569","DOIUrl":"https://doi.org/10.1109/ESGCO.2014.6847569","url":null,"abstract":"Baroreceptor sensitivity has been reported to be larger in response to increases compared to decreases in systolic blood pressure. In the current work we investigate this using spontaneous changes in blood pressure during a speech protocol. It is found that these differing responses are also reflected in ARX model-based estimates of gain, but this is not observed in all individuals.","PeriodicalId":385389,"journal":{"name":"2014 8th Conference of the European Study Group on Cardiovascular Oscillations (ESGCO)","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116517793","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
Assessment of sympathetic baroreflex control during orthostatic challenge before and after prolonged head-down bed rest 长时间头向下卧床休息前后直立挑战时交感压力反射控制的评估
2014 8th Conference of the European Study Group on Cardiovascular Oscillations (ESGCO) Pub Date : 2014-05-25 DOI: 10.1109/ESGCO.2014.6847508
A. Marchi, T. Bassani, V. Bari, K. Heusser, J. Tank, J. Jordan, F. Barbic, R. Furlan, A. Porta
{"title":"Assessment of sympathetic baroreflex control during orthostatic challenge before and after prolonged head-down bed rest","authors":"A. Marchi, T. Bassani, V. Bari, K. Heusser, J. Tank, J. Jordan, F. Barbic, R. Furlan, A. Porta","doi":"10.1109/ESGCO.2014.6847508","DOIUrl":"https://doi.org/10.1109/ESGCO.2014.6847508","url":null,"abstract":"The study characterizes the sympathetic baroreflex control through the assessment of sympathetic baroreflex sensitivity (sBRS). sBRS was assessed as the slope of the regression line of the conditional probability of detecting a burst on the integrated muscle nerve sympathetic activity given an assigned diastolic arterial pressure (DAP) on DAP. sBRS was assessed during orthostatic challenge before and after 21 days -6 degrees head-down bed rest (HDBR) confinement. We identified an effect of the prolonged HDBR and an impairment of the sympathetic baroreflex just before pre-syncope symptoms induced by the orthostatic challenge, thus suggesting a possible role of the sympathetic baroreflex in the origin of neurally-mediated syncope.","PeriodicalId":385389,"journal":{"name":"2014 8th Conference of the European Study Group on Cardiovascular Oscillations (ESGCO)","volume":"77 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114868206","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
Relationship between entropy and symbolic analysis indices of heart rate variability in patients with coronary artery disease with and without diabetes mellitus 冠心病伴与不伴糖尿病患者心率变异性的熵值与符号分析指标的关系
2014 8th Conference of the European Study Group on Cardiovascular Oscillations (ESGCO) Pub Date : 2014-05-25 DOI: 10.1109/ESGCO.2014.6847507
C. B. Falasco Pantoni, Rodrigo Polaquini Simões, Mariana de Oliveira Gois, V. Kunz, V. Castello-Simões, A. Borghi-Silva, A. C. de Medeiros Takahashi, A. Porta, A. Catai
{"title":"Relationship between entropy and symbolic analysis indices of heart rate variability in patients with coronary artery disease with and without diabetes mellitus","authors":"C. B. Falasco Pantoni, Rodrigo Polaquini Simões, Mariana de Oliveira Gois, V. Kunz, V. Castello-Simões, A. Borghi-Silva, A. C. de Medeiros Takahashi, A. Porta, A. Catai","doi":"10.1109/ESGCO.2014.6847507","DOIUrl":"https://doi.org/10.1109/ESGCO.2014.6847507","url":null,"abstract":"The aim of this study was to evaluate the relationship between Shannon entropy (SE) and symbolic analysis (SA) of heart rate variability at rest in 3 groups: patients with coronary artery disease (CAD), CAD with diabetes mellitus (CAD-DM), and healthy individuals (H). We evaluated 44 men into the groups (CAD, n=16, CAD-DM, n=13 and H, n=15). The R-R intervals (R-Ri) were recorded at rest in the supine position for 15 minutes. SA analysis classified patterns of R-Ri according to the number of variations into stable and unstable patterns. Significant and negative correlation was found between SE and the percentage of stable patterns for CAD and CAD-DM. Positive correlation was found between SE and the percentage of unstable patterns in all the groups. We conclude that complexity of cardiovascular control had a positive relationship with the cardiac parasympathetic modulation in all groups and negative relationship with the sympathetic modulation in CAD and CAD-DM groups.","PeriodicalId":385389,"journal":{"name":"2014 8th Conference of the European Study Group on Cardiovascular Oscillations (ESGCO)","volume":"31 11","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113941795","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
Minimally obtrusive measurement devices for monitoring of cardiovascular parameters — An overview 心血管参数监测用最小干扰测量装置。概述
2014 8th Conference of the European Study Group on Cardiovascular Oscillations (ESGCO) Pub Date : 2014-05-25 DOI: 10.1109/ESGCO.2014.6847557
J. Riistama, J. Muehlsteff, H. Reiter, F. Sartor, Auli Sipila
{"title":"Minimally obtrusive measurement devices for monitoring of cardiovascular parameters — An overview","authors":"J. Riistama, J. Muehlsteff, H. Reiter, F. Sartor, Auli Sipila","doi":"10.1109/ESGCO.2014.6847557","DOIUrl":"https://doi.org/10.1109/ESGCO.2014.6847557","url":null,"abstract":"Measurements in clinical settings of cardiovascular parameters often require usage of adhesive electrodes. Therefore clinical measurement methods are hardly applicable for long-term ambulatory monitoring scenarios, since typically trained medical staff is needed e.g. to place electrodes correctly, this compromising patient comfort and generally are difficult to handle by a patient himself as often needed. An overview of emerging, alternative technologies to monitor these parameters in ambulatory context are presented.","PeriodicalId":385389,"journal":{"name":"2014 8th Conference of the European Study Group on Cardiovascular Oscillations (ESGCO)","volume":"77 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130780569","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
The effect of gender, gestational age and behavioral states on fetal heart rate variability 性别、胎龄和行为状态对胎儿心率变异性的影响
2014 8th Conference of the European Study Group on Cardiovascular Oscillations (ESGCO) Pub Date : 2014-05-25 DOI: 10.1109/ESGCO.2014.6847498
H. Gonçalves, D. Ayres-de-Campos, J. Bernardes
{"title":"The effect of gender, gestational age and behavioral states on fetal heart rate variability","authors":"H. Gonçalves, D. Ayres-de-Campos, J. Bernardes","doi":"10.1109/ESGCO.2014.6847498","DOIUrl":"https://doi.org/10.1109/ESGCO.2014.6847498","url":null,"abstract":"Cardiotocography (CTG) is the most frequently used electronic fetal monitoring technique, both in the antepartum and intrapartum periods. A few systems for computer analysis of CTG tracings have been developed, but there is still a large room for improvement in their capacity to diagnose fetal hypoxia/acidosis. Research on fetal heart rate (FHR) analysis has shown that several factors are not commonly considered in such systems, and these can significantly influence the computation of FHR indices: among them are gender, gestational age and fetal behavioral states. A short review is provided on the influence of these factors in FHR analysis, particularly in linear (time- and frequency-domain) and nonlinear (entropy) indices. In conclusion, the effect of gender, gestational age and behavioral states on FHR analysis may need to be considered for the improvement of computer systems developed for that purpose.","PeriodicalId":385389,"journal":{"name":"2014 8th Conference of the European Study Group on Cardiovascular Oscillations (ESGCO)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131080038","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
Nonstationary multivariate modeling of cerebral autoregulation during free-breathing and hypercapnic conditions 自由呼吸和高碳酸血症期间大脑自动调节的非平稳多变量模型
2014 8th Conference of the European Study Group on Cardiovascular Oscillations (ESGCO) Pub Date : 2014-05-25 DOI: 10.1109/ESGCO.2014.6847585
Kyriaki Kostoglou, C. Debert, M. Poulin, G. Mitsis
{"title":"Nonstationary multivariate modeling of cerebral autoregulation during free-breathing and hypercapnic conditions","authors":"Kyriaki Kostoglou, C. Debert, M. Poulin, G. Mitsis","doi":"10.1109/ESGCO.2014.6847585","DOIUrl":"https://doi.org/10.1109/ESGCO.2014.6847585","url":null,"abstract":"We investigated the nonstationary properties of cerebral hemodynamics by examining the relationship between mean arterial blood pressure (MABP), end-tidal CO2 tension (PETCO2) and middle cerebral artery blood flow velocity (CBFV) during resting and hypercapnic conditions. To this end, we employed univariate and multivariate time-varying Laguerre-Volterra models as well as a Recursive Least Squares estimation scheme with multiple adaptive forgetting factors. The results reveal the presence of nonstationarities mainly in the very low frequency range, which are more pronounced and irregular for the CO2 reactivity component.","PeriodicalId":385389,"journal":{"name":"2014 8th Conference of the European Study Group on Cardiovascular Oscillations (ESGCO)","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122831014","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
Granger causality analysis of sleep brain-heart interactions 睡眠脑-心相互作用的格兰杰因果分析
2014 8th Conference of the European Study Group on Cardiovascular Oscillations (ESGCO) Pub Date : 2014-05-25 DOI: 10.1109/ESGCO.2014.6847491
L. Faes, Daniele Marinazzo, F. Jurysta, G. Nollo
{"title":"Granger causality analysis of sleep brain-heart interactions","authors":"L. Faes, Daniele Marinazzo, F. Jurysta, G. Nollo","doi":"10.1109/ESGCO.2014.6847491","DOIUrl":"https://doi.org/10.1109/ESGCO.2014.6847491","url":null,"abstract":"We studied the networks of Granger causality (GC) between the time series of cardiac vagal autonomic activity and brain wave activities, measured respectively as the normalized high frequency (HF) component of heart rate variability and EEG power in the δ, θ, α, σ, β bands, computed in 10 healthy subjects during sleep. GC analysis was performed by vector autoregressive modeling, and significance of each link in the network was assessed using F-statistics. The whole-night analysis revealed the existence of a fully connected network of brain-heart and brain-brain interactions, with the β EEG power acting as a hub which conveys the largest number of GC links between the heart and brain nodes. These links became progressively more weak when assessed during light sleep, deep sleep, and REM sleep, thus suggesting that brain-heart GC networks are sustained mainly by sleep stage transitions.","PeriodicalId":385389,"journal":{"name":"2014 8th Conference of the European Study Group on Cardiovascular Oscillations (ESGCO)","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115218408","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
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