Pub Date : 2022-10-09DOI: 10.1109/ESGCO55423.2022.9931355
G. Valenza, Brittany Nackley, B. Friedman, R. Barbieri
Reliable estimates of cardiac sympathetic activity may not be retrieved from spectral analysis of heart rate variability (HRV) series due to overlap with vagal activity in the low-frequency (0.04-0.14Hz) band. Recently, we proposed a HRV-based index, namely the Sympathetic Activity Index (SAI), which may provide instantaneous estimates of sympa-thetic activity through an orthonormal Laguerre expansion of heartbeat interval series. In this preliminary study, we further validate SAI by performing a correlation analysis with sympathetic- related pre-ejection period (PEP) measurements. Using data gathered from 17 healthy volunteers during a virtual-reality emotional elicitation, results indicate a group-wise SAI-PEP correlation of 0.216 (p < 0.001), with an intra-subject correlation as high as 0.852 (p < 10−6). These findings further support the use of SAI as a proxy measure for the non-invasive, instantaneous estimation of cardiac sympathetic activity.
{"title":"Validation of Sympathetic Activity Index from Heartbeat series: a Preliminary Study on Pre-ejection periods","authors":"G. Valenza, Brittany Nackley, B. Friedman, R. Barbieri","doi":"10.1109/ESGCO55423.2022.9931355","DOIUrl":"https://doi.org/10.1109/ESGCO55423.2022.9931355","url":null,"abstract":"Reliable estimates of cardiac sympathetic activity may not be retrieved from spectral analysis of heart rate variability (HRV) series due to overlap with vagal activity in the low-frequency (0.04-0.14Hz) band. Recently, we proposed a HRV-based index, namely the Sympathetic Activity Index (SAI), which may provide instantaneous estimates of sympa-thetic activity through an orthonormal Laguerre expansion of heartbeat interval series. In this preliminary study, we further validate SAI by performing a correlation analysis with sympathetic- related pre-ejection period (PEP) measurements. Using data gathered from 17 healthy volunteers during a virtual-reality emotional elicitation, results indicate a group-wise SAI-PEP correlation of 0.216 (p < 0.001), with an intra-subject correlation as high as 0.852 (p < 10−6). These findings further support the use of SAI as a proxy measure for the non-invasive, instantaneous estimation of cardiac sympathetic activity.","PeriodicalId":199691,"journal":{"name":"2022 12th Conference of the European Study Group on Cardiovascular Oscillations (ESGCO)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123081115","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}
Pub Date : 2022-10-09DOI: 10.1109/ESGCO55423.2022.9931380
Cosimo Aliani, Eva Rossi, Piergiorgio Francia, Marco U. Luchini, I. Calamai, R. Deodati, Rosario Spina, A. Lanatà, L. Bocchi
The aim of this study was to investigate possible alterations in the relationship between peripheral and central circulation dynamics caused by Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2) infection. Clinical Relevance-Results show how coronavirus disease 2019 can affect the energy of the Low Frequency band [0.04-0.15]Hz of the plethysmographic signal
{"title":"Alterations of oscillatory relationships of plethysmographic signal in patients with COVID-19","authors":"Cosimo Aliani, Eva Rossi, Piergiorgio Francia, Marco U. Luchini, I. Calamai, R. Deodati, Rosario Spina, A. Lanatà, L. Bocchi","doi":"10.1109/ESGCO55423.2022.9931380","DOIUrl":"https://doi.org/10.1109/ESGCO55423.2022.9931380","url":null,"abstract":"The aim of this study was to investigate possible alterations in the relationship between peripheral and central circulation dynamics caused by Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2) infection. Clinical Relevance-Results show how coronavirus disease 2019 can affect the energy of the Low Frequency band [0.04-0.15]Hz of the plethysmographic signal","PeriodicalId":199691,"journal":{"name":"2022 12th Conference of the European Study Group on Cardiovascular Oscillations (ESGCO)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124715605","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}
Pub Date : 2022-10-09DOI: 10.1109/ESGCO55423.2022.9931384
J. Krohova, B. Czippelova, Z. Turianikova, M. Kuricová, D. Černochová, L. Faes, M. Javorka
Considering the potential involvement of the impaired baroreflex function in the pathogenesis of blood pressure dysregulation, including hypertension, this study was aimed to investigate potential changes in two arms of baroreflex control in young normotensive obese patients. Decreases in both arms reflecting impairment of baroreflex function and decreased response of baroreflex related measures to passive orthostasis were observed. We conclude that for better characterization of baroreflex function, not only heart rate as a target of its control should be considered. We suggest that baroreflex impairment affecting both heart rate and vasomotion regulation could be one of the factors contributing to the future development of hypertension in this high-risk associated group.
{"title":"Cardiac chronotropic and vascular resistance arms of baroreflex in obesity","authors":"J. Krohova, B. Czippelova, Z. Turianikova, M. Kuricová, D. Černochová, L. Faes, M. Javorka","doi":"10.1109/ESGCO55423.2022.9931384","DOIUrl":"https://doi.org/10.1109/ESGCO55423.2022.9931384","url":null,"abstract":"Considering the potential involvement of the impaired baroreflex function in the pathogenesis of blood pressure dysregulation, including hypertension, this study was aimed to investigate potential changes in two arms of baroreflex control in young normotensive obese patients. Decreases in both arms reflecting impairment of baroreflex function and decreased response of baroreflex related measures to passive orthostasis were observed. We conclude that for better characterization of baroreflex function, not only heart rate as a target of its control should be considered. We suggest that baroreflex impairment affecting both heart rate and vasomotion regulation could be one of the factors contributing to the future development of hypertension in this high-risk associated group.","PeriodicalId":199691,"journal":{"name":"2022 12th Conference of the European Study Group on Cardiovascular Oscillations (ESGCO)","volume":"94 10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126052085","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}
Pub Date : 2022-10-09DOI: 10.1109/ESGCO55423.2022.9931387
Zoran Matić, Aleksandar Kalauzi, Mirjana M. Platiša, T. Bojić
Background. It has become common in research with detrended fluctuation analysis (DFA) to use slopes of regression lines (α1 and α2) and their ratio as measures of fractal properties of dynamical processes such as physiological rhythm fluctuations. In this study, instead of the ratio (α1/α2) in DFA of ECG RR intervals and respiratory signals, we propose the use of a new measure: the inter-fractal angle (θ) - angle that DFA regression lines form between each other. Methods. Angle θ was obtained by means of graphical-analytical calculation. Using one way-Anova test, sensitivity of θ on the influence of slow breathing and orthostasis was compared in respect to ratio α1/α2. Results. Comparisons revealed that changes of (θ) were statistically more significant than changes of αl/α2. Conclusion. Inter-fractal angle is an elegant new measure of DFA that is more sensitive to perturbations such as changes in body posture and breathing regime than α1/α2.
{"title":"Sensitivity Estimations in Favor of Using Inter-fractal Angle in Detrended Fluctuation Analysis","authors":"Zoran Matić, Aleksandar Kalauzi, Mirjana M. Platiša, T. Bojić","doi":"10.1109/ESGCO55423.2022.9931387","DOIUrl":"https://doi.org/10.1109/ESGCO55423.2022.9931387","url":null,"abstract":"Background. It has become common in research with detrended fluctuation analysis (DFA) to use slopes of regression lines (α1 and α2) and their ratio as measures of fractal properties of dynamical processes such as physiological rhythm fluctuations. In this study, instead of the ratio (α1/α2) in DFA of ECG RR intervals and respiratory signals, we propose the use of a new measure: the inter-fractal angle (θ) - angle that DFA regression lines form between each other. Methods. Angle θ was obtained by means of graphical-analytical calculation. Using one way-Anova test, sensitivity of θ on the influence of slow breathing and orthostasis was compared in respect to ratio α1/α2. Results. Comparisons revealed that changes of (θ) were statistically more significant than changes of αl/α2. Conclusion. Inter-fractal angle is an elegant new measure of DFA that is more sensitive to perturbations such as changes in body posture and breathing regime than α1/α2.","PeriodicalId":199691,"journal":{"name":"2022 12th Conference of the European Study Group on Cardiovascular Oscillations (ESGCO)","volume":"92 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114606376","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}
Pub Date : 2022-10-09DOI: 10.1109/ESGCO55423.2022.9931353
D. Makowiec, Joanna Wdowczyk, M. Gruchała
Heart rate variability (HRV) observed in con-secutive windows of nocturnal Holter recordings, is used to assess the development of left ventricular hypertrophy (LVH) in heart transplant (HTX) patients. Based on the relations between variability of HRV metrics estimated in windows, one can discern the appearance of LVH and also qualify the development of LVH. In particular, the graft with concentric geometry can be distinguished from the hypertrophic state. Clinical Relevance-LVH affects HRV in HTX patients in a way that can assist in the non-invasive quantification of the development of the hypertrophy
{"title":"Variability of heart rate variability indexes for estimates of left ventricular hypertrophy in subjects shortly after a heart transplant*","authors":"D. Makowiec, Joanna Wdowczyk, M. Gruchała","doi":"10.1109/ESGCO55423.2022.9931353","DOIUrl":"https://doi.org/10.1109/ESGCO55423.2022.9931353","url":null,"abstract":"Heart rate variability (HRV) observed in con-secutive windows of nocturnal Holter recordings, is used to assess the development of left ventricular hypertrophy (LVH) in heart transplant (HTX) patients. Based on the relations between variability of HRV metrics estimated in windows, one can discern the appearance of LVH and also qualify the development of LVH. In particular, the graft with concentric geometry can be distinguished from the hypertrophic state. Clinical Relevance-LVH affects HRV in HTX patients in a way that can assist in the non-invasive quantification of the development of the hypertrophy","PeriodicalId":199691,"journal":{"name":"2022 12th Conference of the European Study Group on Cardiovascular Oscillations (ESGCO)","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128570372","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}
Pub Date : 2022-10-09DOI: 10.1109/ESGCO55423.2022.9931378
Katarzyna B. Kubiak, B. Więckowska, T. Krauze, J. Piskorski, P. Guzik
Using two Poincare plots to analyze concordant systolic blood pressure (SBP) and RR interval changes, we have developed a novel method for quantifying baroreflex function (the ppBR method). The ppBR method quantifies the short-(BRS1), long-term (BRS2), and total baroreflex sensitivity (BRST), and baroreflex effectiveness (BRE) for increasing (uu) and decreasing (dd) values of SBP and RR intervals. The ppBR also explores the asymmetrical features of the baroreflex separately for uu and dd SBP-RR intervals interactions. The 30-minute resting beat-to-beat recordings of SBP and RR intervals from ECG from 156 healthy young adults were cut into thirty 1-minute windows. The ppBR method demonstrated asymmetrical features of BRS1 and BRE, and found that BRS2 and BRST gradually increased with the duration of the supine rest. The ppBR method visualizes subtle changes in the relationship between SBP and RR intervals caused by the cardiovascular adaptation to the rest in the supine position.
{"title":"Detection of the baroreflex function changes during the 30-minute supine rest by the Poincaré plot-based method","authors":"Katarzyna B. Kubiak, B. Więckowska, T. Krauze, J. Piskorski, P. Guzik","doi":"10.1109/ESGCO55423.2022.9931378","DOIUrl":"https://doi.org/10.1109/ESGCO55423.2022.9931378","url":null,"abstract":"Using two Poincare plots to analyze concordant systolic blood pressure (SBP) and RR interval changes, we have developed a novel method for quantifying baroreflex function (the ppBR method). The ppBR method quantifies the short-(BRS1), long-term (BRS2), and total baroreflex sensitivity (BRST), and baroreflex effectiveness (BRE) for increasing (uu) and decreasing (dd) values of SBP and RR intervals. The ppBR also explores the asymmetrical features of the baroreflex separately for uu and dd SBP-RR intervals interactions. The 30-minute resting beat-to-beat recordings of SBP and RR intervals from ECG from 156 healthy young adults were cut into thirty 1-minute windows. The ppBR method demonstrated asymmetrical features of BRS1 and BRE, and found that BRS2 and BRST gradually increased with the duration of the supine rest. The ppBR method visualizes subtle changes in the relationship between SBP and RR intervals caused by the cardiovascular adaptation to the rest in the supine position.","PeriodicalId":199691,"journal":{"name":"2022 12th Conference of the European Study Group on Cardiovascular Oscillations (ESGCO)","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130572562","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}
Pub Date : 2022-10-09DOI: 10.1109/ESGCO55423.2022.9931358
G. Baselli, Federica Fasani, L. Pelizzari, M. Cazzoli, F. Baglio, M. M. Laganá
Real-time, phase-contrast MRI (RT-PC-MRI) provides a quantitative evaluation of flow signals. Focusing the high cervical level, the fluid interchange of the intracranial compartment can thus be monitored. In the present study we address the beat-to-beat variability of the arterial, venous, and liquor flows in 30 healthy volunteers. Also, the median beats in the inspiratory and expiratory phases are derived, considering three respiratory conditions: free, paced, and deep. These results, though preliminary, clearly demonstrate the utility of this new technique.
{"title":"Real Time Phase Contrast MRI and Cerebrovascular Beat-to-Beat Variability Changes with Respiration Mode","authors":"G. Baselli, Federica Fasani, L. Pelizzari, M. Cazzoli, F. Baglio, M. M. Laganá","doi":"10.1109/ESGCO55423.2022.9931358","DOIUrl":"https://doi.org/10.1109/ESGCO55423.2022.9931358","url":null,"abstract":"Real-time, phase-contrast MRI (RT-PC-MRI) provides a quantitative evaluation of flow signals. Focusing the high cervical level, the fluid interchange of the intracranial compartment can thus be monitored. In the present study we address the beat-to-beat variability of the arterial, venous, and liquor flows in 30 healthy volunteers. Also, the median beats in the inspiratory and expiratory phases are derived, considering three respiratory conditions: free, paced, and deep. These results, though preliminary, clearly demonstrate the utility of this new technique.","PeriodicalId":199691,"journal":{"name":"2022 12th Conference of the European Study Group on Cardiovascular Oscillations (ESGCO)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132882619","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}
Pub Date : 2022-10-09DOI: 10.1109/ESGCO55423.2022.9931388
G. Volpes, Chiara Barà, Simone Valenti, M. Javorka, A. Busacca, L. Faes, R. Pernice
In this work, we study ultra-short term (UST) complexity of Heart Rate Variability (HRV) and its agreement with analysis of standard short-term (ST) HRV recordings obtained at rest and during orthostatic stress. Conditional Entropy (CE) measures have been computed using both a linear Gaussian approximation and a more accurate model-free approach based on nearest neighbors. The agreement between UST and ST indices has been compared via statistical tests and correlation analysis, suggesting the feasibility of exploiting faster algorithms and shorter time series for detecting changes in cardiovascular control during various states.
{"title":"Feasibility of Ultra-short Term Complexity Analysis of Heart Rate Variability in Resting State and During Orthostatic Stress","authors":"G. Volpes, Chiara Barà, Simone Valenti, M. Javorka, A. Busacca, L. Faes, R. Pernice","doi":"10.1109/ESGCO55423.2022.9931388","DOIUrl":"https://doi.org/10.1109/ESGCO55423.2022.9931388","url":null,"abstract":"In this work, we study ultra-short term (UST) complexity of Heart Rate Variability (HRV) and its agreement with analysis of standard short-term (ST) HRV recordings obtained at rest and during orthostatic stress. Conditional Entropy (CE) measures have been computed using both a linear Gaussian approximation and a more accurate model-free approach based on nearest neighbors. The agreement between UST and ST indices has been compared via statistical tests and correlation analysis, suggesting the feasibility of exploiting faster algorithms and shorter time series for detecting changes in cardiovascular control during various states.","PeriodicalId":199691,"journal":{"name":"2022 12th Conference of the European Study Group on Cardiovascular Oscillations (ESGCO)","volume":"72 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121120439","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}
Pub Date : 2022-10-09DOI: 10.1109/ESGCO55423.2022.9931391
G. Mijatović, Chiara Barà, T. Lončar-Turukalo, L. Faes
We present an approach to quantify the predictive capacity of point processes analyzed in continuous time. An index of the so-called memory utilization rate (MUR) is defined as a model-free measure of the amount of predictive information stored in a point process. A strategy for the data-efficient, model-free estimation of MUR is proposed and validated in simulations of independent and history-dependent heartbeat intervals. Our results document the ability of the proposed MUR estimator to detect the absence and quantify the extent of predictable information in heart rate variability signals.
{"title":"A method to Quantify Memory Utilization of Heartbeat Dynamics in Continuous Time","authors":"G. Mijatović, Chiara Barà, T. Lončar-Turukalo, L. Faes","doi":"10.1109/ESGCO55423.2022.9931391","DOIUrl":"https://doi.org/10.1109/ESGCO55423.2022.9931391","url":null,"abstract":"We present an approach to quantify the predictive capacity of point processes analyzed in continuous time. An index of the so-called memory utilization rate (MUR) is defined as a model-free measure of the amount of predictive information stored in a point process. A strategy for the data-efficient, model-free estimation of MUR is proposed and validated in simulations of independent and history-dependent heartbeat intervals. Our results document the ability of the proposed MUR estimator to detect the absence and quantify the extent of predictable information in heart rate variability signals.","PeriodicalId":199691,"journal":{"name":"2022 12th Conference of the European Study Group on Cardiovascular Oscillations (ESGCO)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129809617","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}
Pub Date : 2022-10-09DOI: 10.1109/ESGCO55423.2022.9931370
B. Graff, G. Graff, P. Pilarczyk, M. Szymańska, K. Narkiewicz
Subjects with desaturations and sleep apnea episodes during the night characterize with higher variability of parameters describing breathing pattern during wakefulness which might suggest altered respiratory regulation even in mild sleep apnea.
{"title":"Assessment of respiratory pattern variability during wakefulness in subjects with sleep apnea","authors":"B. Graff, G. Graff, P. Pilarczyk, M. Szymańska, K. Narkiewicz","doi":"10.1109/ESGCO55423.2022.9931370","DOIUrl":"https://doi.org/10.1109/ESGCO55423.2022.9931370","url":null,"abstract":"Subjects with desaturations and sleep apnea episodes during the night characterize with higher variability of parameters describing breathing pattern during wakefulness which might suggest altered respiratory regulation even in mild sleep apnea.","PeriodicalId":199691,"journal":{"name":"2022 12th Conference of the European Study Group on Cardiovascular Oscillations (ESGCO)","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121469636","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}
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