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Fractal behavior of heart rate variability during ECG stress test in cardiac patients 心脏病人心电图应激试验中心率变异性的分形行为
2014 8th Conference of the European Study Group on Cardiovascular Oscillations (ESGCO) Pub Date : 2014-05-25 DOI: 10.1109/ESGCO.2014.6847566
G. D'Addio, M. Romano, L. Maresca, P. Bifulco, E. Fornasa, F. Giallauria, M. Cesarelli, C. Vigorito
{"title":"Fractal behavior of heart rate variability during ECG stress test in cardiac patients","authors":"G. D'Addio, M. Romano, L. Maresca, P. Bifulco, E. Fornasa, F. Giallauria, M. Cesarelli, C. Vigorito","doi":"10.1109/ESGCO.2014.6847566","DOIUrl":"https://doi.org/10.1109/ESGCO.2014.6847566","url":null,"abstract":"Linear measures of heart rate variability (HRV) during ECG stress test has been widely questioned due to the high signal non-stationary. Such limitations can be overcome by nonlinear measures of HRV based on typical properties of chaotic systems and deterministic fractal. Very few paper addressed such issue and aim of the paper is to describe fractal behavior of HRV during exercise. A fractal analysis by Higuchi's algorithm (FD) has been performed on 26 cardiac patients during resting, stress, early and late recovery phases of ECG stress test. Results showed a significant FD increasing values from resting to stress phase that was not recovered at all immediately after the exercise, and it was slightly recovered both during early and late recovery phase. The performance of fractal analysis of HRV during and after high intensity exercise suggests that it could be a useful index assessing relevant information about underlying physiological recovery.","PeriodicalId":385389,"journal":{"name":"2014 8th Conference of the European Study Group on Cardiovascular Oscillations (ESGCO)","volume":"63 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":"133942005","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
Smartphone-camera-acquired pulse photoplethysmographic signal for deriving respiratory rate 智能手机摄像头采集的脉冲光容积脉搏波信号，用于计算呼吸频率
2014 8th Conference of the European Study Group on Cardiovascular Oscillations (ESGCO) Pub Date : 2014-05-25 DOI: 10.1109/ESGCO.2014.6847549
J. Lázaro, Yunyoung Nam, E. Gil, P. Laguna, K. Chon
{"title":"Smartphone-camera-acquired pulse photoplethysmographic signal for deriving respiratory rate","authors":"J. Lázaro, Yunyoung Nam, E. Gil, P. Laguna, K. Chon","doi":"10.1109/ESGCO.2014.6847549","DOIUrl":"https://doi.org/10.1109/ESGCO.2014.6847549","url":null,"abstract":"A method for deriving respiratory rate from smartphone-camera-acquired pulse photoplethysmographic (SCPPG) signal is presented. It combines information from three derived respiration signals based on pulse width, amplitude, and rate variability (PWV, PAV, and PRV). Evaluation is performed over a database containing SCPPG signals recorded from 10 healthy subjects during controlled respiration experiments at rates from 0.2 to 0.6 Hz with a step of 0.1 Hz, using iPhone 4S device. Results suggest that habitual spontaneous respiratory rates (0.2-0.4 Hz) can be estimated from SCPPG signals by PWV and by PRV with low relative error (median of order 0.5% and IQR of order 2%). PWV method maintained its performance at rates up to 0.5 Hz, and the accuracy can be improved by combining it with other methods such as PRV and PAV.","PeriodicalId":385389,"journal":{"name":"2014 8th Conference of the European Study Group on Cardiovascular Oscillations (ESGCO)","volume":"124 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":"117214250","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
Detecting synchronization and interrelations in multivariate time series 多变量时间序列的同步和相互关系检测
2014 8th Conference of the European Study Group on Cardiovascular Oscillations (ESGCO) Pub Date : 2014-05-25 DOI: 10.1109/ESGCO.2014.6847573
U. Parlitz, S. Luther
{"title":"Detecting synchronization and interrelations in multivariate time series","authors":"U. Parlitz, S. Luther","doi":"10.1109/ESGCO.2014.6847573","DOIUrl":"https://doi.org/10.1109/ESGCO.2014.6847573","url":null,"abstract":"Different cases of generalized synchronization are discussed with emphasis on methods for detecting them from time series. In particular, we shall focus on synchronization resulting in complex (non-smooth and/or non-invertible) functions or relations between drive and response that can be detected by means of a data driven extension of the auxiliary systems test.","PeriodicalId":385389,"journal":{"name":"2014 8th Conference of the European Study Group on Cardiovascular Oscillations (ESGCO)","volume":"3 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":"126793460","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
Discrimination and relevance determination of heart rate variability features for the identification of congestive heart failure 识别充血性心力衰竭的心率变异性特征的鉴别和相关性测定
2014 8th Conference of the European Study Group on Cardiovascular Oscillations (ESGCO) Pub Date : 2014-05-25 DOI: 10.1109/ESGCO.2014.6847598
C. Heinze, D. Sommer, U. Trutschel, M. Golz
{"title":"Discrimination and relevance determination of heart rate variability features for the identification of congestive heart failure","authors":"C. Heinze, D. Sommer, U. Trutschel, M. Golz","doi":"10.1109/ESGCO.2014.6847598","DOIUrl":"https://doi.org/10.1109/ESGCO.2014.6847598","url":null,"abstract":"We propose a machine learning framework that implements automated relevance determination in order to identify the deciding RR interval features for the discrimination between congestive heart failure and healthy condition. As a result, the most relevant features of heart rate variability (HRV) are narrowly located spectral components in the very-low and low frequency band, and specific ordinal patterns. HRV is generally reduced in comparison to the healthy condition; also the autonomic regulation of heart rate acceleration and deceleration appears to be pathlogically inversed.","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":"126025847","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
Reduction of baroreflex blood pressure oscillations in 12-month-old SHR: Central and peripheral mechanisms 12个月大SHR患者压反射性血压振荡的降低:中枢和外周机制
2014 8th Conference of the European Study Group on Cardiovascular Oscillations (ESGCO) Pub Date : 2014-05-25 DOI: 10.1109/ESGCO.2014.6847596
O. Tarasova, N. V. Tarasova, E. Lukoshkova, S. Mochalov, D. Gaynullina, A. Borovik
{"title":"Reduction of baroreflex blood pressure oscillations in 12-month-old SHR: Central and peripheral mechanisms","authors":"O. Tarasova, N. V. Tarasova, E. Lukoshkova, S. Mochalov, D. Gaynullina, A. Borovik","doi":"10.1109/ESGCO.2014.6847596","DOIUrl":"https://doi.org/10.1109/ESGCO.2014.6847596","url":null,"abstract":"The aim of this study was to reveal the changes of short-term cardiovascular variability in rats with sustained primary hypertension and correlate them with functional alterations of peripheral arteries. 12-month-old SHR as compared to Wistar rats demonstrated prominent reductions of mean arterial pressure and pulse interval spectral powers in the range 0.25-0.75 Hz. These alterations were associated with prominent reductions of cardiac baroreflex gain and constrictor responses of small arteries to electrical stimulation of sympathetic fibers and exogenous noradrenaline. We suggest that both central and peripheral mechanisms are responsible for the reduction of baroreflex arterial pressure oscillations in mature SHR.","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":"123505866","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
Measurement of QT variability by two-dimensional warping 二维扭曲测量QT变异性
2014 8th Conference of the European Study Group on Cardiovascular Oscillations (ESGCO) Pub Date : 2014-05-25 DOI: 10.1109/ESGCO.2014.6847570
S. Zaunseder, M. Schmidt, H. Malberg, M. Baumert
{"title":"Measurement of QT variability by two-dimensional warping","authors":"S. Zaunseder, M. Schmidt, H. Malberg, M. Baumert","doi":"10.1109/ESGCO.2014.6847570","DOIUrl":"https://doi.org/10.1109/ESGCO.2014.6847570","url":null,"abstract":"This contribution presents a novel warping method, two-dimensional signal warping (2DSW), for tracking beat-to-beat changes in time intervals from electrocardiograms. To evaluate the efficiency of 2DSW to capture subtle changes in the QT interval we apply 2DSW to the Physionet QT database. It is shown that 2DSW allows highly accurate tracking of QRS-onset and T-end, which renders the method useful for future clinical applications, in particular beat-to-beat variability analysis of ECG features.","PeriodicalId":385389,"journal":{"name":"2014 8th Conference of the European Study Group on Cardiovascular Oscillations (ESGCO)","volume":"18 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":"121537071","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
Short-term complexity of cardiovascular oscillations in frailty syndrome 虚弱综合征中心血管震荡的短期复杂性
2014 8th Conference of the European Study Group on Cardiovascular Oscillations (ESGCO) Pub Date : 2014-05-25 DOI: 10.1109/ESGCO.2014.6847499
A. Takahashi, Lelia A. Bonjorni, M. Buto, V. Vassimon-Barroso, V. Minatel, Suzana M. A. Rocha, Fernanda H. M. Ribeiro, N. Montano, A. Porta, A. Catai
{"title":"Short-term complexity of cardiovascular oscillations in frailty syndrome","authors":"A. Takahashi, Lelia A. Bonjorni, M. Buto, V. Vassimon-Barroso, V. Minatel, Suzana M. A. Rocha, Fernanda H. M. Ribeiro, N. Montano, A. Porta, A. Catai","doi":"10.1109/ESGCO.2014.6847499","DOIUrl":"https://doi.org/10.1109/ESGCO.2014.6847499","url":null,"abstract":"Frailty has been described as a clinical state of vulnerability to stress, consequence from decline of resilience and physiological reserves and progressive decline on ability of homeostasis maintenance. The aim of this study was to evaluate the complexity of R-R intervals (RR) in resting supine (REST) and standing (STAND) position in 3 groups: frail, pre-frail and non-frail. Eighty older people (60-94 years old) were divided into frail group (n = 6), pre-frail (n=36) and non-frail group (n=38). The RR series were recorded at REST and during STAND for 10 minutes in each position. Short sequences of RR were analyzed by conditional entropy (CE) and approximate entropy (ApEn). Position, group and interaction effects were evaluated by two-way repeated-measures ANOVA. CE indicated only position effect while ApEn showed only group effect. ApEn seems to be more suitable for assessing changes in the complexity in frailty syndrome.","PeriodicalId":385389,"journal":{"name":"2014 8th Conference of the European Study Group on Cardiovascular Oscillations (ESGCO)","volume":"66 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":"131968061","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: 6
Directed coherence analysis in patients with severe autonomic dysfunction 严重自主神经功能障碍患者的定向一致性分析
2014 8th Conference of the European Study Group on Cardiovascular Oscillations (ESGCO) Pub Date : 2014-05-25 DOI: 10.1109/ESGCO.2014.6847572
K. Andersson, O. Suhr, L. Faes, U. Wiklund
{"title":"Directed coherence analysis in patients with severe autonomic dysfunction","authors":"K. Andersson, O. Suhr, L. Faes, U. Wiklund","doi":"10.1109/ESGCO.2014.6847572","DOIUrl":"https://doi.org/10.1109/ESGCO.2014.6847572","url":null,"abstract":"Many different approaches have been applied to analyse the coupling between cardiovascular signals. This study evaluated the use of directed coherence, based on multivariate autoregressive modelling, for analysis of cardiovascular signals in patients with transthyretin amyloidosis, a rare disease where severe autonomic dysfunction is common.","PeriodicalId":385389,"journal":{"name":"2014 8th Conference of the European Study Group on Cardiovascular Oscillations (ESGCO)","volume":"212 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":"132233065","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
Binary Symbolic Dynamics of Fetal Heart Rate Reflects Individual Gestational Development 胎儿心率的二元符号动力学反映个体妊娠发育
2014 8th Conference of the European Study Group on Cardiovascular Oscillations (ESGCO) Pub Date : 2014-05-25 DOI: 10.1109/ESGCO.2014.6847506
D. Cysarz, F. Edelhauser, P. van Leeuwen
{"title":"Binary Symbolic Dynamics of Fetal Heart Rate Reflects Individual Gestational Development","authors":"D. Cysarz, F. Edelhauser, P. van Leeuwen","doi":"10.1109/ESGCO.2014.6847506","DOIUrl":"https://doi.org/10.1109/ESGCO.2014.6847506","url":null,"abstract":"Fetal heart rate and its variability (HRV) changes with gestational age reflecting fetal growth and the increase of neural integration. The individual gestational development is consistently reflected by the amount of irregularity of fetal HRV. We investigated binary symbolic dynamics of fetal heart rate with respect to individual changes during gestation. In 11 fetuses 215 fetal magnetocardiograms were acquired during the second and third trimester. Short term beat-to-beat changes reflecting acceleration and deceleration of heart rate were coded in 4 bit binary patterns. To reduce redundancies in the patterns five pattern sets were created according to the complexities of the 24 different patterns. The occurrence of two pattern sets consistently decreased individually with progressing gestation (R2 = 0.38, CI 0.00-0.71 and R2 = 0.24, CI 0.02-0.68). The course over all fetuses was less consistent. Hence, symbolic dynamics analysis reflects individual heart rate development over gestation.","PeriodicalId":385389,"journal":{"name":"2014 8th Conference of the European Study Group on Cardiovascular Oscillations (ESGCO)","volume":"370 ","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113995807","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
Symbolic analysis of heart rate variability differentiates anesthesiological procedures 心率变异性的符号分析区分麻醉程序
2014 8th Conference of the European Study Group on Cardiovascular Oscillations (ESGCO) Pub Date : 2014-05-25 DOI: 10.1109/ESGCO.2014.6847544
S. Guzzetti, T. Bassani, Giuseppe Criterio, A. Porta
{"title":"Symbolic analysis of heart rate variability differentiates anesthesiological procedures","authors":"S. Guzzetti, T. Bassani, Giuseppe Criterio, A. Porta","doi":"10.1109/ESGCO.2014.6847544","DOIUrl":"https://doi.org/10.1109/ESGCO.2014.6847544","url":null,"abstract":"The present study exploited symbolic analysis of heart period (HP) variability during three different anesthetic strategies during neurosurgical procedures. We monitored HP variability in 93 patients during elective neurosurgical procedures. Patients were randomly assigned to three anesthetic strategies: sevoflurane+fentanyl (S-F), sevoflurane+remifentanil (S-R) and propofol+remifentanil (P-R). All anesthetic strategies were characterized by a reduction of HP variability. An increased presence of stable patterns was detected in the P-R group. Conversely, an increased presence of instable patterns was present in the second hour of surgery in S-F group. Despite an important reduction of HP variability, the symbolic analysis differentiates anesthetic strategies.","PeriodicalId":385389,"journal":{"name":"2014 8th Conference of the European Study Group on Cardiovascular Oscillations (ESGCO)","volume":"14 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":"115096379","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
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