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Time-variant parametric estimation of transient quadratic phase couplings between heart rate components in healthy neonates

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Abstract

The heart rate variability (HRV) can be taken as an indicator of the coordination of the cardio-respiratory rhythms. Bispectral analysis using a direct (fast Fourier transform based) and time-invariant approach has shown the occurrence of a quadratic phase coupling (QPC) between a low-frequency (LF: 0.1 Hz) and a high-frequency (HF: 0.4–0.6 Hz) component of the HRV during quiet sleep in healthy neonates. The low-frequency component corresponds to the Mayer–Traube–Hering waves in blood pressure and the high-frequency component to the respiratory sinus arrhythmia (RSA). Time-variant, parametric estimation of the bispectrum provides the possibility of quantifying QPC in the time course. Therefore, the aim of this work was a parametric, time-variant bispectral analysis of the neonatal HRV in the same neonates used in the direct, time-invariant approach. For the first time rhythms in the time course of QPC between the HF component and the LF component could be shown in the neonatal HRV.

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Acknowledgment

This study was supported by the Deutsche Forschungsgemeinschaft (DFG, Wi 1166/2-3 and 2-4).

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Authors and Affiliations

  1. Institute of Medical Statistics, Computer Sciences and Documentation, Medical Faculty of the Friedrich Schiller University Jena, Bachstr. 18, 07740, Jena, Germany

    K. Schwab, M. Eiselt, P. Putsche, M. Helbig & H. Witte

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  1. K. Schwab
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  2. M. Eiselt
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  3. P. Putsche
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  4. M. Helbig
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  5. H. Witte
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Correspondence to K. Schwab.

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Schwab, K., Eiselt, M., Putsche, P. et al. Time-variant parametric estimation of transient quadratic phase couplings between heart rate components in healthy neonates. Med Bio Eng Comput 44, 1077–1083 (2006). https://doi.org/10.1007/s11517-006-0120-7

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  • DOI: https://doi.org/10.1007/s11517-006-0120-7

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