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Entropy 2015, 17(3), 1007-1022; doi:10.3390/e17031007

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

1
Hypertension Unit, Department of Hypertension and Diabetology, Medical University of Gdańsk, Dębinki 7c, 80-952 Gdańsk, Poland
2
Faculty of Applied Physics and Mathematics, Gdańsk University of Technology, Narutowicza 11/12,80-233 Gdańsk, Poland
3
Institute of Theoretical Physics and Astrophysics, University of Gdańsk, Wita Stwosza 57, 80-952Gdańsk, Poland
4
Department of Cardiology and Electrotherapy, Medical University of Gdańsk, Dębinki 7, 80-952Gdańsk, Poland
*
Author to whom correspondence should be addressed.
Academic Editor: Niels Wessel
Received: 12 December 2014 / Revised: 9 February 2015 / Accepted: 25 February 2015 / Published: 2 March 2015
(This article belongs to the Special Issue Entropy and Cardiac Physics)
View Full-Text   |   Download PDF [288 KB, uploaded 2 March 2015]   |  

Abstract

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 (HUTT). Time-domain heart rate variability (HRV) indices and several nonlinear parameters were calculated using 500 RR interval-long ECG recordings done before tilting in patients with a history suggesting vasovagal syncope. Groups of patients with so-called cardiodepressive vasovagal syncope (VVS_2) during HUTT and patients who did not faint during the test were compared. Two types of HUT tests were analyzed: with spontaneous (SB) or controlled breathing (CB). In our study, SampEn was higher in VVS_2 patients during SB, and PermEn was higher in VVS_2 patients during CB. Irrespective of the type of breathing during the test, SampEn and PermEn were similar in patients with the same type of reaction during HUTT. The use of several entropy-based parameters seems to be useful in HRV assessment in patients with vasovagal fainting. View Full-Text
Keywords: sample entropy; permutation entropy; heart rate variability; tilt test; vasovagal syndrome sample entropy; permutation entropy; heart rate variability; tilt test; vasovagal syndrome
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Graff, B.; Graff, G.; Makowiec, D.; Kaczkowska, A.; Wejer, D.; Budrejko, S.; Kozłowski, D.; Narkiewicz, K. Entropy Measures in the Assessment of Heart Rate Variability in Patients with Cardiodepressive Vasovagal Syncope. Entropy 2015, 17, 1007-1022.

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