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Quantifying the Interactions between Maternal and Fetal Heart Rates by Transfer Entropy
Faezeh Marzbanrad1, Yoshitaka Kimura2, Marimuthu Palaniswami1
1Electrical and Electronic Engineering Department, University of Melbourne, Melbourne, VIC 3010, Australia.
Plos One
|December 25, 2015
Summary
This study reveals how maternal and fetal heart rates interact throughout pregnancy using Transfer Entropy (TE). Fetal-to-maternal information transfer decreases with gestational age, while maternal-to-fetal transfer increases, indicating developing fetal systems.
Area of Science:
- Cardiology
- Maternal-Fetal Medicine
- Biomedical Engineering
Background:
- Maternal and fetal heart rate (HR) coupling is known but underlying mechanisms remain unclear.
- Limited understanding of how this coupling evolves throughout gestation.
Purpose of the Study:
- To quantify directed interactions between maternal and fetal HR using Transfer Entropy (TE).
- To investigate patterns of fetal-maternal heart rate coupling across different gestational ages and time delays.
Main Methods:
- Utilized Transfer Entropy (TE) to analyze directed interactions between maternal and fetal heart rates from electrocardiograms (ECG).
- Compared TE values against surrogate data for statistical validation.
- Analyzed TE at various time delays and gestational ages (early, mid, late).
Main Results:
- Significant fetal-maternal heart rate coupling observed in 63/65 fetuses.
- Fetal-to-maternal information transfer (TE) decreased with advancing gestational age.
- Maternal-to-fetal TE increased from early to mid/late gestation, particularly in fetuses with higher RMSSD.
- Information transfer delay from mother to fetus decreased significantly in late gestation.
Conclusions:
- Transfer Entropy (TE) effectively reveals detailed dynamics of fetal-maternal heart rate coupling.
- Observed changes correlate with fetal sensory and autonomic nervous system maturation.
- This approach may offer novel clinical markers for fetal development and well-being.
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