Agnieszka Kaczkowska - Publications - Bridge of Knowledge

Search

Filters

total: 16

  • Category
  • Year
  • Options

clear Chosen catalog filters disabled

Catalog Publications

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...

    Full text to download in external service

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)...

    Full text available to download

  • 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...

    Full text available to download

  • 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...

    Full text available to download

  • 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...

    Full text to download in external service

Year 2014
Year 2013
Year 2012

seen 648 times