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Application of an Amplitude-integrated EEG Monitor (Cerebral Function Monitor) to Neonates
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Fetal functional brain age assessed from universal developmental indices obtained from neuro-vegetative activity

Dirk Hoyer1, Florian Tetschke, Susan Jaekel

  • 1Jena University Hospital, Biomagnetic Center, Hans Berger Department of Neurology, Jena, Germany.

Plos One
|September 24, 2013
PubMed
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We developed a fetal autonomic brain age score (fABAS) using heart rate patterns to assess fetal brain development. This score reflects normal brain maturation and can identify developmental alterations in conditions like intrauterine growth restriction.

Area of Science:

  • Neuroscience
  • Developmental Biology
  • Cardiology

Background:

  • Fetal brain development is crucial and involves autonomic nervous system (ANS) control.
  • Disturbances in fetal brain development can lead to postnatal diseases.
  • Assessing functional brain age is vital for understanding developmental trajectories.

Purpose of the Study:

  • To develop a fetal autonomic brain age score (fABAS) using heart rate patterns.
  • To assess functional brain age based on autonomic control patterns.
  • To investigate fABAS in fetuses with intrauterine growth restriction.

Main Methods:

  • Analyzed magnetocardiographic recordings from 113 fetuses in quiet sleep and 286 in active sleep (21.4-40.3 weeks gestation).
  • Utilized cross-validated multivariate linear regression models incorporating indices of fluctuation range, complexity, and pattern formation (skewness, VLF/LF ratio, pNN5).

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Last Updated: May 7, 2026

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  • Employed logistic regression for automatic sleep state reclassification based on fluctuation range and fetal age.

    • Main Results:

    • fABAS explained 66% (quiet sleep) and 51% (active sleep) of age-related variance.
    • Automatic sleep state reclassification achieved 94.3% (quiet sleep) and 93.1% (active sleep) accuracy.
    • Explorative analysis of fetuses with intrauterine growth restriction showed a shift towards active awakeness and lower fABAS values.

    Conclusions:

    • Functional brain age can be assessed using autonomic control patterns and universal developmental indices.
    • fABAS effectively reflects normal complex fetal brain maturation.
    • Altered fABAS values in growth-restricted fetuses suggest impacts on autonomic development.