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[The cardiotocography instrument test].

J Morgenstern, U Naumann, T Somville

    Geburtshilfe Und Frauenheilkunde
    |May 1, 1986
    PubMed
    Summary
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    This study tested eight cardiotocography units for fetal heart rate monitoring. None met obstetricians' needs for beat-to-beat accuracy using ultrasonic signals.

    Area of Science:

    • Medical Devices
    • Biomedical Engineering
    • Obstetrics

    Background:

    • Cardiotocography (CTG) is crucial for fetal well-being assessment.
    • Accurate fetal heart rate (FHR) monitoring is essential during labor.
    • Existing CTG units rely on ultrasonic Doppler signals.

    Purpose of the Study:

    • To comparatively evaluate the performance of eight cardiotocographic units.
    • To assess the accuracy of FHR calculation from ultrasonic signals.
    • To determine if current CTG units meet clinical demands for beat-to-beat FHR determination.

    Main Methods:

    • A standardized testing system was developed using a water tank and electromagnet to simulate fetal movements.
    • Artificial Doppler signals mimicking in vivo signals were generated.

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  • Eight cardiotocographic units were tested under controlled conditions.
  • Performance was evaluated by comparing recorded signals to direct ECG input.

    • Main Results:

    • All tested cardiotocographic units were evaluated based on signal processing and accuracy.
    • Key parameters analyzed included oscillations per minute and amplitude.
    • Electronic distortion and incomplete signal recording were considered.
    • No unit satisfied the requirement for beat-to-beat FHR determination.

    Conclusions:

    • Current cardiotocographic technology using ultrasonic signals has limitations in achieving beat-to-beat FHR accuracy.
    • Further advancements are needed to meet the stringent clinical requirements of obstetricians.
    • The study highlights discrepancies between device capabilities and clinical expectations for fetal monitoring.