Assessment of the dynamic interactions between heart rate and arterial pressure by the cross time-frequency analysis

Physiological Measurement
Michele OriniRaquel Bailón

Abstract

In this study, a framework for the characterization of the dynamic interactions between RR variability (RRV) and systolic arterial pressure variability (SAPV) is proposed. The methodology accounts for the intrinsic non-stationarity of the cardiovascular system and includes the assessment of both the strength and the prevalent direction of local coupling. The smoothed pseudo-Wigner-Ville distribution (SPWVD) is used to estimate the time-frequency (TF) power, coherence, and phase-difference spectra with fine TF resolution. The interactions between the signals are quantified by time-varying indices, including the local coupling, phase differences, time delay, and baroreflex sensitivity (BRS). Every index is extracted from a specific TF region, localized by combining information from the different spectra. In 14 healthy subjects, a head-up tilt provoked an abrupt decrease in the cardiovascular coupling; a rapid change in the phase difference (from 0.37 ± 0.23 to -0.27 ± 0.22 rad) and time delay (from 0.26 ± 0.14 to -0.16 ± 0.16 s) in the high-frequency band; and a decrease in the BRS (from 23.72 ± 7.66 to 6.92 ± 2.51 ms mmHg(-1)). In the low-frequency range, during a head-up tilt, restoration of the baseline level of cardiovascular...Continue Reading

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Citations

Mar 20, 2010·Medical & Biological Engineering & Computing·Michele OriniPablo Laguna
Nov 16, 2013·IEEE Transactions on Bio-medical Engineering·Michele OriniPier Lambiase
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Jan 19, 2017·Physiological Measurement·Agnieszka UrygaMagdalena Kasprowicz
Mar 14, 2019·Computational and Mathematical Methods in Medicine·Agnieszka KazimierskaMagdalena Kasprowicz
Feb 14, 2019·Annals of Biomedical Engineering·Stefan van DuijvenbodenMichele Orini
May 7, 2019·Frontiers in Neuroscience·Jesús LázaroRaquel Bailón
Oct 6, 2020·Frontiers in Physiology·Sebastian Ruiz-BlaisElaine Chew
Mar 20, 2021·Frontiers in Physiology·Peter MukliAndras Eke
Jun 5, 2021·Biophysical Journal·Anatoly S KaravaevAnton R Kiselev

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