Zipf’s Law of Vasovagal Heart Rate Variability Sequences
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  • Release Date: 2021-10-29
  • baroreflex
  • heart rate variability
  • self-organized criticality
  • vasovagal syncope
  • Zipf’s law
  • blood pressure
Video Introduction

This video is adapted from 10.3390/e22040413

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. Researcher primary aim was to verify whether SOC could be studied by solely observing bradycardias and by showing their distribution according to Zipf’s law. They 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.

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Fortrat, J. Zipf’s Law of Vasovagal Heart Rate Variability Sequences. Encyclopedia. Available online: https://encyclopedia.pub/video/video_detail/105 (accessed on 24 April 2024).
Fortrat J. Zipf’s Law of Vasovagal Heart Rate Variability Sequences. Encyclopedia. Available at: https://encyclopedia.pub/video/video_detail/105. Accessed April 24, 2024.
Fortrat, Jacques-Olivier. "Zipf’s Law of Vasovagal Heart Rate Variability Sequences" Encyclopedia, https://encyclopedia.pub/video/video_detail/105 (accessed April 24, 2024).
Fortrat, J. (2021, October 29). Zipf’s Law of Vasovagal Heart Rate Variability Sequences. In Encyclopedia. https://encyclopedia.pub/video/video_detail/105
Fortrat, Jacques-Olivier. "Zipf’s Law of Vasovagal Heart Rate Variability Sequences." Encyclopedia. Web. 29 October, 2021.