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Zipf’s Law of Vasovagal Heart Rate Variability Sequences
Cardiovascular self-organized criticality (SOC) has recently been demonstrated by studying vasovagal sequences. These sequences combine bradycardia and a decrease in blood pressure. Observing enough of these sparse events is a barrier that prevents a better understanding of cardiovascular SOC. Our p...
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Formato: | Online Artículo Texto |
Lenguaje: | English |
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MDPI
2020
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Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7516888/ https://www.ncbi.nlm.nih.gov/pubmed/33286187 http://dx.doi.org/10.3390/e22040413 |
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author | Fortrat, Jacques-Olivier |
author_facet | Fortrat, Jacques-Olivier |
author_sort | Fortrat, Jacques-Olivier |
collection | PubMed |
description | Cardiovascular self-organized criticality (SOC) has recently been demonstrated by studying vasovagal sequences. These sequences combine bradycardia and a decrease in blood pressure. Observing enough of these sparse events is a barrier that prevents a better understanding of cardiovascular SOC. Our primary aim was to verify whether SOC could be studied by solely observing bradycardias and by showing their distribution according to Zipf’s law. We studied patients with vasovagal syncope. Twenty-four of them had a positive outcome to the head-up tilt table test, while matched patients had a negative outcome. Bradycardias were distributed according to Zipf’s law in all of the patients. The slope of the distribution of vasovagal sequences and bradycardia are slightly but significantly correlated, but only in cases of bradycardias shorter than five beats, highlighting the link between the two methods (r = 0.32; p < 0.05). These two slopes did not differ in patients with positive and negative outcomes, whereas the distribution slopes of bradycardias longer than five beats were different between these two groups (−0.187 ± 0.004 and −0.213 ± 0.006, respectively; p < 0.01). Bradycardias are distributed according to Zipf’s law, providing clear insight into cardiovascular SOC. Bradycardia distribution could provide an interesting diagnosis tool for some cardiovascular diseases. |
format | Online Article Text |
id | pubmed-7516888 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2020 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-75168882020-11-09 Zipf’s Law of Vasovagal Heart Rate Variability Sequences Fortrat, Jacques-Olivier Entropy (Basel) Article Cardiovascular self-organized criticality (SOC) has recently been demonstrated by studying vasovagal sequences. These sequences combine bradycardia and a decrease in blood pressure. Observing enough of these sparse events is a barrier that prevents a better understanding of cardiovascular SOC. Our primary aim was to verify whether SOC could be studied by solely observing bradycardias and by showing their distribution according to Zipf’s law. We studied patients with vasovagal syncope. Twenty-four of them had a positive outcome to the head-up tilt table test, while matched patients had a negative outcome. Bradycardias were distributed according to Zipf’s law in all of the patients. The slope of the distribution of vasovagal sequences and bradycardia are slightly but significantly correlated, but only in cases of bradycardias shorter than five beats, highlighting the link between the two methods (r = 0.32; p < 0.05). These two slopes did not differ in patients with positive and negative outcomes, whereas the distribution slopes of bradycardias longer than five beats were different between these two groups (−0.187 ± 0.004 and −0.213 ± 0.006, respectively; p < 0.01). Bradycardias are distributed according to Zipf’s law, providing clear insight into cardiovascular SOC. Bradycardia distribution could provide an interesting diagnosis tool for some cardiovascular diseases. MDPI 2020-04-06 /pmc/articles/PMC7516888/ /pubmed/33286187 http://dx.doi.org/10.3390/e22040413 Text en © 2020 by the author. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Fortrat, Jacques-Olivier Zipf’s Law of Vasovagal Heart Rate Variability Sequences |
title | Zipf’s Law of Vasovagal Heart Rate Variability Sequences |
title_full | Zipf’s Law of Vasovagal Heart Rate Variability Sequences |
title_fullStr | Zipf’s Law of Vasovagal Heart Rate Variability Sequences |
title_full_unstemmed | Zipf’s Law of Vasovagal Heart Rate Variability Sequences |
title_short | Zipf’s Law of Vasovagal Heart Rate Variability Sequences |
title_sort | zipf’s law of vasovagal heart rate variability sequences |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7516888/ https://www.ncbi.nlm.nih.gov/pubmed/33286187 http://dx.doi.org/10.3390/e22040413 |
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