Dorota Wejer

The Makowiec Generalised Asymmetry Index for assessing asymmetry in heart rate and blood pressure variability in obstructive sleep apnea and healthy men

Beata Graff, Dorota Wejer, Paweł Pilarczyk, Grzegorz Graff

Abstract The Makowiec Generalised Asymmetry Index, denoted by $${{\,\textrm{MI}\,}}(q)$$ MI ( q ) , is a q -parameterised family of directional asymmetry measures for time series, computed from short-term recordings to quantify the imbalance between opposite changes (increases vs. decreases) across fluctuation …

pl (code pays fourni par la source)

The data-based model of interaction between the respiratory and cardiovascular systems

Dorota Wejer, Beata Graff, Krzysztof Narkiewicz, Danuta Makowiec

Respiration and heart rate continuously interact, and in the following, we are looking for variations in RR-intervals, systolic, and diastolic blood pressure caused by different phases of breathing. We propose a data-based model of interaction in the cardio-respiratory system, which is driven …

pl (code pays fourni par la source)

Dynamical Landscape of Heart Rhythm in Discerning Erratic Rhythm in Elderly People

Danuta Makowiec, Dorota Wejer, Joanna Wdowczyk, Marta Żarczyńska-Buchowiecka et autres

We hypothesize that increase with age of short-term measures of heart rhythm [a way in which accelerations and decelerations appear], especially dynamical pattern indices [Transition Rates (S T ) or self-Transfer Entropy (sTE)], provide indicates for unhealthy autonomic activity or cardiac tissue …

pl, jp (code pays fourni par la source)

Dynamical Landscape of Heart Rhythm in Long-Term Heart Transplant Recipients: A Way to Discern Erratic Rhythms

Joanna Wdowczyk, Danuta Makowiec, Marcin Gruchała, Dorota Wejer et autres

It is commonly believed that higher values of heart rate variability (HRV) indices account for better organization of the network of feedback reflexes driving an organism's response to actual bodily needs. In order to evaluate this organization in heart transplant (HTX) recipients, …

pl, jp (code pays fourni par la source)

Dynamical Pattern Representation of Cardiovascular Couplings Evoked by Head-up Tilt Test

Danuta Makowiec, Dorota Wejer, Beata Graff, Zbigniew R. Struzik

Shannon entropy (ShE) is a recognised tool for the quantization of the temporal organization of time series. Transfer entropy (TE) provides insight into the dependence between coupled systems. Here, signals are analysed that were produced by the cardiovascular system when a healthy …

pl, jp (code pays fourni par la source)

Visualization of Short-Term Heart Period Variability with Network Tools as a Method for Quantifying Autonomic Drive

Danuta Makowiec, Beata Graff, Agnieszka Kaczkowska, Grzegorz Graff et autres

Network methods have been successfully used to capture and represent properties of multilevel complex man-made systems and living organisms. The use of network representations in the characterization of time series complexity is a relatively new but quickly developing branch of time series …

pl, jp (code pays fourni par la source)

Complexity of cardiovascular rhythms during head-up tilt test by entropy of patterns

Dorota Wejer, Beata Graff, Danuta Makowiec, Szymon Budrejko et autres

OBJECTIVE: The head-up tilt (HUT) test, which provokes transient dynamical alterations in the regulation of cardiovascular system, provides insights into complex organization of this system. Based on signals with heart period intervals (RR-intervals) and/or systolic blood pressure (SBP), differences in the cardiovascular …

pl, jp (code pays fourni par la source)

The use of Transfer Entropy method for the assessment of cardiovascular regulation during head-up tilt test

Beata Graff, Dorota Wejer, L. Faes, Grzegorz Graff et autres

pl, it (code pays fourni par la source)

Causal relationships in the variability of cardiovascular system evoked by orthostatic stress by transfer entropy

Dorota Wejer, Luca Faes, Danuta Makowiec

The coupling between cardiac and vascular systems in healthy volunteers, elicited by the head-up tilt test is estimated by means of transfer entropy with non-uniform embedding. The method applied to beat-to-beat recordings with heart periods and systolic blood pressure, supports the commonly …

pl, it (code pays fourni par la source)

Chronographic Imprint of Age-Induced Alterations in Heart Rate Dynamical Organization

Danuta Makowiec, Dorota Wejer, Agnieszka Kaczkowska, Marta Żarczyńska-Buchowiecka et autres

Beat-to-beat changes in the heart period are transformed into a network of increments between subsequent RR-intervals, which enables graphical descriptions of short-term heart period variability. Three types of such descriptions are considered: (1) network graphs arising from a set of vertices and …

pl, jp (code pays fourni par la source)

Generalised heart rate statistics reveal neurally mediated homeostasis transients

Danuta Makowiec, Beata Graff, W. Miklaszewski, Dorota Wejer et autres

Distributions of accelerations and decelerations, obtained from increments of heart rate recorded during a head-up tilt table (HUTT) test provide short-term characterization of the complex cardiovascular response to a rapid controlled dysregulation of homeostasis. A generalised statistic is proposed for evaluating the …

pl, jp (code pays fourni par la source)

Entropic Measures of Complexity of Short-Term Dynamics of Nocturnal Heartbeats in an Aging Population

Danuta Makowiec, Agnieszka Kaczkowska, Dorota Wejer, Marta Żarczyńska-Buchowiecka et autres

Two entropy-based approaches are investigated to study patterns describing differences in time intervals between consecutive heartbeats. The first method explores matrices arising from networks of transitions constructed following events represented by a time series. The second method considers distributions of ordinal patterns …

pl, jp (code pays fourni par la source)