Entropy Analysis of RR and QT Interval Variability during Orthostatic and Mental Stress in Healthy Subjects

Baumert, Mathias; Czippelová, Barbora; Ganesan, Anand N.; Schmidt, Martin; Zaunseder, Sebastian; Javorka, Michal

doi:10.3390/e16126384

Cited by 21 publications

(16 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In addition, in both groups we were able to observe a decrease in SampEn values in Phase 2 and Phase 4 if we compared with pre-exercise and post-exercise stages, being a higher difference in the asymptomatic group. In other articles, similar results were shown, where the head-up tilt test resulted in a significant reduction in SampEn of R-R interval, these measures of entropy are suitable to detect changes in neural outflow to the heart and decoupling of repolarization variability from heart rate variability elicited by orthostatic stress [15]. On the other hand, the symptomatic OI group showed higher SampEn values in all stages, but these differences between both groups did not reach statistical significance.…”

Section: Resultssupporting

confidence: 67%

Sample Entropy Analysis of Hemodynamic Parameters in elderly with Orthostatic Intolerance Symptoms

Hortelano¹,

Reilly

Cervigón³

2016

2016 Computing in Cardiology Conference (CinC)

View full text Add to dashboard Cite

This study focuses on examining the hemodynamic profile in older people with symptoms of orthostatic intolerance (OI) undergoing an active stand and to investigate if their dynamic cardiovascular profile during six-minute walk distance would be different to those of controls. The database included a total of 65 participants, aged over 70 years of age (70.11±5.85), of whom 65% were females. The participants underwent a supine to stand orthostatic test with non-invasive beat to beat systolic (SBP) and diastolic blood pressure (DBP) and inter-beat interval (R-R) monitoring. Sample Entropy (SampEn) method was calculated at each phase. R-R SampEn values showed statistically significant differences during Phase 2 and Phase 4 between symptomatic and asymptomatic OI participants. This study empathizes the importance of entropy analysis to extract information of cardiovascular signals. SampEn based measures might provide useful indicators of pathological changes in cardiac activity and be suitable for the early detection of autonomic cardiovascular dysfunction.

show abstract

Section: Resultssupporting

confidence: 67%

Sample Entropy Analysis of Hemodynamic Parameters in elderly with Orthostatic Intolerance Symptoms

Hortelano¹,

Reilly

Cervigón³

2016

2016 Computing in Cardiology Conference (CinC)

View full text Add to dashboard Cite

show abstract

“…The result of their study showed the increment of Kolmogorov–Sinai entropy in reflexological stimulation compare to relaxed sitting, which indicates that the ECG signal becomes more random with reflexology. Baumert et al 27. explored the influence of head-up tilt and mental arithmetic stress on beat-to-beat variability of heart rate and QT interval, by computing sample entropy and cross-sample entropy.…”

mentioning

confidence: 99%

Fractal Based Analysis of the Influence of Odorants on Heart Activity

Namazi

Kulish

2016

Sci Rep

View full text Add to dashboard Cite

An important challenge in heart research is to make the relation between the features of external stimuli and heart activity. Olfactory stimulation is an important type of stimulation that affects the heart activity, which is mapped on Electrocardiogram (ECG) signal. Yet, no one has discovered any relation between the structures of olfactory stimuli and the ECG signal. This study investigates the relation between the structures of heart rate and the olfactory stimulus (odorant). We show that the complexity of the heart rate is coupled with the molecular complexity of the odorant, where more structurally complex odorant causes less fractal heart rate. Also, odorant having higher entropy causes the heart rate having lower approximate entropy. The method discussed here can be applied and investigated in case of patients with heart diseases as the rehabilitation purpose.

show abstract

“…These results are also consistent with previous studies where cardiac Autonomous Nervous System (ANS) is impaired in frail elderly people, as indicated by a reduction in the complexity of HR dynamics, reduced HR variability, reduced HR changes in response to daily activities and is likely to be a consequence of a reduced vagal activity. Nevertheless, in this case the reduction is lower in symptomatic OI patients if we compared them with asymptomatic OI participants [ 40 , 41 ].…”

Section: Discussionmentioning

confidence: 99%

Refined Multiscale Fuzzy Entropy to Analyse Post-Exercise Cardiovascular Response in Older Adults With Orthostatic Intolerance

Hortelano¹,

Reilly

Castells

et al. 2018

Entropy

View full text Add to dashboard Cite

Orthostatic intolerance syndrome occurs when the autonomic nervous system is incapacitated and fails to respond to the demands associated with the upright position. Assessing this syndrome among the elderly population is important in order to prevent falls. However, this problem is still challenging. The goal of this work was to determine the relationship between orthostatic intolerance (OI) and the cardiovascular response to exercise from the analysis of heart rate and blood pressure. More specifically, the behavior of these cardiovascular variables was evaluated in terms of refined composite multiscale fuzzy entropy (RCMFE), measured at different scales. The dataset was composed by 65 older subjects, 44.6% (n = 29) were OI symptomatic and 55.4% (n = 36) were not. Insignificant differences were found in age and gender between symptomatic and asymptomatic OI participants. When heart rate was evaluated, higher differences between groups were observed during the recovery period immediately after exercise. With respect to the blood pressure and other hemodynamic parameters, most significant results were obtained in the post-exercise stage. In any case, the symptomatic OI group exhibited higher irregularity in the measured parameters, as higher RCMFE levels in all time scales were obtained. This information could be very helpful for a better understanding of cardiovascular instability, as well as to recognize risk factors for falls and impairment of functional status.

show abstract

Entropy Analysis of RR and QT Interval Variability during Orthostatic and Mental Stress in Healthy Subjects

Cited by 21 publications

References 22 publications

Sample Entropy Analysis of Hemodynamic Parameters in elderly with Orthostatic Intolerance Symptoms

Sample Entropy Analysis of Hemodynamic Parameters in elderly with Orthostatic Intolerance Symptoms

Fractal Based Analysis of the Influence of Odorants on Heart Activity

Refined Multiscale Fuzzy Entropy to Analyse Post-Exercise Cardiovascular Response in Older Adults With Orthostatic Intolerance

Contact Info

Product

Resources

About