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Related Concept Videos

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Salt particles that have dissolved in water never spontaneously come back together in solution to reform solid particles. Moreover, a gas that has expanded in a vacuum remains dispersed and never spontaneously reassembles. The unidirectional nature of these phenomena is the result of a thermodynamic state function called entropy (S). Entropy is the measure of the extent to which the energy is dispersed throughout a system, or in other words, it is proportional to the degree of disorder of a...
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Related Experiment Video

Updated: Feb 2, 2026

Isolation of Leukocytes from the Murine Tissues at the Maternal-Fetal Interface
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Coupling Analysis of Fetal and Maternal Heart Rates via Transfer Entropy Using Magnetocardiography.

R Avci, D Escalona-Vargas, E R Siegel

    Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference
    |November 17, 2018
    PubMed
    Summary
    This summary is machine-generated.

    Fetal magnetocardiography (fMCG) accurately measures fetal heart rates (fHR). This study found fetal movement does not impact the analysis of coupling between fetal and maternal heart rates using Transfer Entropy (TE).

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    Area of Science:

    • Cardiovascular Physiology
    • Biomedical Engineering
    • Non-invasive Fetal Monitoring

    Background:

    • Fetal and maternal cardiac systems exhibit short-term coupling.
    • Fetal magnetocardiography (fMCG) offers high signal-to-noise ratio (SNR) and temporal resolution for fetal heart rate (fHR) estimation.
    • Transfer Entropy (TE) quantifies information transfer between variables to assess coupling.

    Purpose of the Study:

    • To analyze the coupling between fetal heart rates (fHR) and maternal heart rates (mHR) using TE.
    • To investigate the influence of fetal movement (FM) on TE calculations.
    • To compare TE values across different gestational age (GA) groups.

    Main Methods:

    • Utilized 74 fMCG recordings to compute bidirectional TE over 1-minute time windows (TW).
    • Compared TE values between time windows with and without fetal movement (FM) using Wilcoxon Signed-Rank test.
    • Compared TE in non-FM segments between two gestational age groups (GA1<32 weeks, GA2≥32 weeks) using Rank-Sum test.

    Main Results:

    • TE values computed during FM were not significantly different from those during non-FM periods.
    • No significant differences in TE values were observed between the two GA groups for non-FM segments.
    • The study indicates that FM does not affect TE computations.

    Conclusions:

    • Fetal movement does not significantly alter the analysis of fetal-maternal heart rate coupling via Transfer Entropy.
    • fMCG and TE are robust methods for studying fetal-maternal cardiac interactions across different gestational ages.
    • The findings support the reliability of fMCG-based TE analysis in the presence of fetal movement.