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Related Concept Videos

Fetal Circulation01:14

Fetal Circulation

Fetal circulation is a unique system that facilitates the exchange of gases, nutrients, and waste products between the developing fetus and the mother. This intricate process takes place through a special organ called the placenta.
Two umbilical arteries transport blood from the fetus to the placenta. At the placenta, the blood absorbs oxygen and nutrients while simultaneously eliminating waste products. This oxygen-enriched and nutrient-rich blood then returns to the fetus through one...
Pulse rhythm01:30

Pulse rhythm

Pulse rhythm refers to the pattern of pulsations within specific intervals, offering valuable insights into the regularity or irregularity of the heart's beats as observed through the pattern of pulsation within specific intervals. A regular pulse exhibits a consistent heart rate with uniform waveforms and pulsation force, variations of which can be classified as normal, weak, or bounding.
Conversely, an irregular pulse pattern is termed dysrhythmia, stemming from disruptions in cardiac muscle...
Correlation between ECG and Cardiac Cycle01:25

Correlation between ECG and Cardiac Cycle

The electrical signals recorded on an electrocardiogram (ECG) occur before the mechanical processes of contraction and relaxation during the cardiac cycle.
A cardiac action potential originates in the SA node and spreads throughout the atria and the AV node in approximately 0.03 seconds. This results in the P wave in an ECG and triggers atrial contraction. The action potential is then briefly slowed at the AV node, allowing the atria to contract and fill the ventricles with blood before...

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Related Experiment Video

Updated: Jul 8, 2026

Human Fetal Blood Flow Quantification with Magnetic Resonance Imaging and Motion Compensation
06:56

Human Fetal Blood Flow Quantification with Magnetic Resonance Imaging and Motion Compensation

Published on: January 7, 2021

A Kalman Filter-Based Framework for Granger Causality Assessment: Application in Tracking Maternal-Fetal Heart Rate

Masoud Nateghi, Reza Sameni

    IEEE Transactions on Bio-Medical Engineering
    |July 6, 2026
    PubMed
    Summary

    This study introduces a new Kalman filter-based method to analyze nonstationary Granger causality between fetal and maternal heart rates. The novel approach identifies brief coupling episodes missed by traditional methods, revealing dynamic interactions during pregnancy and labor.

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    Published on: April 18, 2025

    Area of Science:

    • Biomedical Engineering
    • Physiological Signal Processing
    • Maternal-Fetal Medicine

    Background:

    • Fetal and maternal heart rates (FHR and MHR) are key indicators of well-being during labor.
    • Assessing directed coupling between FHR and MHR reveals crucial interactions.
    • Nonstationary coupling, influenced by labor dynamics, challenges traditional analysis tools.

    Purpose of the Study:

    • To develop and evaluate a Kalman filter-based, time-varying autoregressive framework for nonstationary Granger causality (GC) assessment.
    • To analyze maternal-fetal heart rate coupling during pregnancy and labor.
    • To identify transient coupling episodes missed by stationary methods.

    Main Methods:

    • Introduced a Kalman filter (KF)-based, time-varying autoregressive (TVAR) framework for nonstationary GC.
    • Modeled autoregressive coefficients as latent states in a linear state-space model, tracked recursively by an optimized KF.
    • Calculated time-varying GC by comparing prediction errors with and without the other signal's history.

    Main Results:

    • The KF-TVAR GC method successfully identified brief, statistically significant MHR-FHR coupling episodes.
    • Stationary GC methods failed to localize these transient coupling events.
    • Maternal-to-fetal coupling was generally stronger in late pregnancy, shifting to fetal-to-maternal during labor.

    Conclusions:

    • The proposed KF-TVAR framework provides a robust method for analyzing nonstationary physiological signals like FHR and MHR.
    • This approach offers a significant advancement over traditional stationary methods for detecting dynamic interactions.
    • The findings highlight shifts in maternal-fetal heart rate coupling dynamics throughout pregnancy and labor.