Agnieszka Kaczkowska - Publications - Bridge of Knowledge

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Year 2017
  • Visualization of short-term heart period variability with network tools as a method for quantifying autonomic drive
    Publication
    • D. Makowiec
    • B. Graff
    • A. Kaczkowska
    • G. Graff
    • D. Wejer
    • J. Wdowczyk-Szulc
    • M. Żarczyńska-Buchowiecka
    • M. Gruchała
    • Z. R. Struzik

    - Year 2017

    We argue that network methods are successful in detecting nonlinear properties in the dynamics of autonomic nocturnal regulation in short-term variability. Two modes of visualization of networks constructed from RR-increments are proposed. The first is based on the handling of a state space. The state space of RR-increments can be modified by a bin size used to code a signal and by the role of a given vertex as the representation...

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Year 2015
  • Chronographic Imprint of Age-Induced Alterations in Heart Rate Dynamical Organization
    Publication
    • D. Makowiec
    • D. Wejer
    • A. Kaczkowska
    • M. Żarczyńska-Buchowiecka
    • Z. R. Struzik

    - Frontiers in Physiology - Year 2015

    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 directed edges, (2) contour plots of adjacency matrices A, representing the networks and transition matrices T, resulting from A, and (3)...

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  • Entropic Measures of Complexity of Short-Term Dynamics of Nocturnal Heartbeats in an Aging Population
    Publication
    • D. Makowiec
    • A. Kaczkowska
    • D. Wejer
    • M. Żarczyńska-Buchowiecka
    • Z. R. Struzik

    - ENTROPY - Year 2015

    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 of length three, whereby patterns with repeated values are counted as different patterns. Both methods provide...

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  • Entropy Measures in the Assessment of Heart Rate Variability in Patients with Cardiodepressive Vasovagal Syncope
    Publication

    - ENTROPY - Year 2015

    Sample entropy (SampEn) was reported to be useful in the assessment of the complexity of heart rate dynamics. Permutation entropy (PermEn) is a new measure based on the concept of order and was previously shown to be accurate for short, non-stationary datasets. The aim of the present study is to assess if SampEn and PermEn obtained from baseline recordings might differentiate patients with various outcomes of the head-up tilt test...

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  • Generalised heart rate statistics reveal neurally mediated homeostasis transients
    Publication
    • D. Makowiec
    • B. Graff
    • W. Miklaszewski
    • D. Wejer
    • A. Kaczkowska
    • S. Budrejko
    • Z. R. Struzik

    - EPL-EUROPHYS LETT - Year 2015

    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 neural reflexes responsible for restoring the homeostatic dynamics. An evaluation of the effects on heart rate...

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