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Updated: Jun 26, 2026
Fetal Mouse Cardiovascular Imaging Using a High-frequency Ultrasound (30/45MHZ) System
Published on: May 5, 2018
Indices of fetal development derived from heart rate patterns
Dirk Hoyer1, Esther Heinicke, Susann Jaekel
1University Hospital, Biomagnetic Center, Department of Neurology, Friedrich Schiller University of Jena, Germany. Dirk.Hoyer@biomag.uni-jena.de
Insights
Fetal autonomic control maturation can be assessed using heart rate modulation indices from biomagnetic recordings. These findings may help identify developmental risks and future health issues.
Area of Science:
- Developmental medicine
- Fetal physiology
- Autonomic nervous system research
Background:
- Adverse prenatal environments can lead to later-life mental and cardiovascular diseases.
- Limited measurable parameters exist for assessing fetal development and autonomic control.
- Assessing fetal autonomic control maturation is crucial for early detection of developmental problems.
Purpose of the Study:
- To describe normal fetal maturation using heart rate modulation indices.
- To establish baseline data for fetal autonomic nervous system development.
- To identify potential biomarkers for fetal well-being.
Main Methods:
- Magnetocardiography (MCG) recorded fetal heart beat intervals (1 kHz sampling) over 30 minutes in 78 fetuses (23-40 weeks gestational age).
- Analyzed indices included accelerations (AC), decelerations (DC), RMSSD, SDNN, and autonomic information flows (AIF_NN, AIF_fVLF).
- Measurements were taken from entire 30-minute recordings and 10-minute activity-specific subsets.
Main Results:
- With increasing gestational age (GA), fetal recordings showed increased AC, decreased DC, increased RMSSD and SDNN, and increased AIF_fVLF; AIF_NN remained constant.
- In 10-minute subsets, SDNN increased with GA in active states but remained constant in quiet states.
- AIF_NN decreased with GA during quiet fetal states.
Conclusions:
- Biomagnetic recordings of fetal heart rate patterns offer novel indices for assessing autonomic control maturation.
- These indices can help identify normal and abnormal fetal development.
- This approach may aid in identifying risks for later-life disorders.
Background:
The fetal precursors of mental and cardiovascular disease caused by adverse prenatal environmental influences and manifesting in later age are an important issue of developmental medicine. However the number of measurable functional parameters of a fetus is limited. Evaluation of key parameters involving fetal autonomic control could permit an earlier detection of developmental problems and improved therapeutic strategies. Thus far, however, even the maturation of normal autonomic control has not been sufficiently assessed.
Aim:
The objective of the present work is to describe normal fetal maturation based on indices of autonomic heart rate modulation.
Study Design:
Heart beat interval series were magnetocardiographically recorded with 1 kHz sampling rate over 30 min in 78 normal fetuses, gestational age (GA) 23-40 weeks. Indices considered were: number of accelerations (AC) and decelerations (DC), RMSSD, SDNN, and short-term/long-term autonomic information flows (AIF_NN, AIF_fVLF). These were measured from the entire 30 min data sets and from activity-specific subsets (10 min).
Results:
In the 30 min recordings: the number of AC increased, number of DC decreased, rMSSD and SDNN increased and AIF_fVLF increased with GA, but AIF_NN remained constant. In the 10 min subsets: SDNN increased in the active state but remained constant in the quiet state and AIF_NN decreased with GA in the quiet state.
Conclusion:
Heart rate patterns from 30 min biomagnetic recordings may provide new indices with which to assess the normal and abnormal maturation of fetal autonomic control and to identify risk of possible disorders in later life.
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