New results in magnitude and sign correlations in heartbeat fluctuations for healthy persons and Congestive Heart Failure (CHF) patients

A. Muñoz Diosdado, H. Reyes Cruz, D. Bueno Hernández, G. Gálvez Coyt, J. Arellanes González

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Scopus citations

Abstract

Heartbeat fluctuations exhibit temporal structure with fractal and nonlinear features that reflect changes in the neuroautonomic control. In this work we have used the detrended fluctuation analysis (DFA) to analyze heartbeat (RR) intervals of 54 healthy subjects and 40 patients with congestive heart failure during 24 hours; we separate time series for sleep and wake phases. We observe long-range correlations in time series of healthy persons and CHF patients. However, the correlations for CHF patients are weaker than the correlations for healthy persons; this fact has been reported by Ashkenazy et al. [1] but with a smaller group of subjects. In time series of CHF patients there is a crossover, it means that the correlations for high and low frequencies are different, but in time series of healthy persons there are not crossovers even if they are sleeping. These crossovers are more pronounced for CHF patients in the sleep phase. We decompose the heartbeat interval time series into magnitude and sign series, we know that these kinds of signals can exhibit different time organization for the magnitude and sign and the magnitude series relates to nonlinear properties of the original time series, while the sign series relates to the linear properties. Magnitude series are long-range correlated, while the sign series are anticorrelated. Newly, the correlations for healthy persons are different that the correlations for CHF patients both for magnitude and sign time series. In the paper of Ashkenazy et al. they proposed the empirical relation: αsign ≈ 1/2(αoriginal + αmagnitude) for the short-range regime (high frequencies), however, we have found a different relation that in our calculations is valid for short and long-range regime: αsign ≈ 1/4(αoriginal + αmagnitude).

Original languageEnglish
Title of host publicationMedical Physics - Tenth Mexican Symposium on Medical Physics
Pages255-258
Number of pages4
DOIs
StatePublished - 2008
Event10th Mexican Symposium on Medical Physics - Mexico City, Mexico
Duration: 17 Mar 200819 Mar 2008

Publication series

NameAIP Conference Proceedings
Volume1032
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Conference

Conference10th Mexican Symposium on Medical Physics
Country/TerritoryMexico
CityMexico City
Period17/03/0819/03/08

Keywords

  • Heart dynamics
  • Nonlinear dynamics

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