The effect of respiratory oscillations in heart rate on detrended fluctuation analysis

Characterization of heart rate using detrended fluctuation analysis (DFA) is impeded by respiratory oscillations. In particular, the short-term exponent measured from 15 to 30 beats is compromised in the DFA. We reconstruct respiratory signal from electrocardiograms and attenuate the respiratory osc...

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Bibliographic Details
Published in:The European physical journal. B, Condensed matter physics Condensed matter physics, 2017-10, Vol.90 (10), p.1-6, Article 191
Main Authors: Govindan, Rathinaswamy B., Kota, Srinivas, Al-Shargabi, Tareq, Swisher, Christopher B., du Plessis, Adre
Format: Article
Language:English
Subjects:
Analysis
Attenuation
Complex Systems
Computer simulation
Condensed Matter Physics
Differential equations
Electrocardiography
Exponents
Fluid- and Aerodynamics
Heart rate
Infants
Oscillations
Physics
Physics and Astronomy
Regular Article
Solid State Physics
Subtraction
Trigonometric functions
Variation
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Summary:Characterization of heart rate using detrended fluctuation analysis (DFA) is impeded by respiratory oscillations. In particular, the short-term exponent measured from 15 to 30 beats is compromised in the DFA. We reconstruct respiratory signal from electrocardiograms and attenuate the respiratory oscillation in the heart rate using a frequency-dependent subtraction approach. We validate this method by applying it to an electrocardiogram signal simulated using a coupled differential equation with the respiratory oscillation modelled using a sine function. The exponent estimated using the proposed approach agreed with the exponent incorporated in the model within a narrow range. In contrast, the exponent obtained from the raw data deviated from the expected value. Furthermore, the exponents obtained for the raw heart rate are smaller than the exponents obtained for the respiration oscillation attenuated heart rate. We apply this approach to heart rate measured from 12 preterm infants that were being treated for prematurity related complications. As observed in the simulated data, we show that compared to the raw heart rate, the respiratory oscillation attenuated heart rate shows higher short-term exponent ( p < 0.001).
ISSN:1434-6028
1434-6036
DOI:10.1140/epjb/e2017-80378-x