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The physiological basis for fetal assessment.

J Patrick1

  • 1Department of Obstetrics and Gynaecology, University of Western Ontario, Lawson Research Institute, London, Canada.

Seminars in Perinatology
|October 1, 1989
PubMed
Summary
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Fetal testing methods like biophysical profile are reliable in late pregnancy but lack animal data for early gestation. New methods assessing fetal response to sound and vibration require investigation.

Area of Science:

  • Perinatology
  • Fetal Physiology

Background:

  • Significant advancements in understanding fetal responses to hypoxia over 15 years.
  • Established human data on fetal activity and heart rate (FHR) patterns in mid-pregnancy.
  • Limited animal data exists to validate fetal activity and blood flow indices in mid-gestation.

Purpose of the Study:

  • To evaluate the scientific basis of current fetal testing methods.
  • To explore novel methods for assessing fetal health, specifically fetal responses to sound and vibration.
  • To address the limitations of existing fetal assessment techniques.

Main Methods:

  • Review of existing human and animal experimental data on fetal responses.
  • Analysis of established fetal testing methods: biophysical profile, non-stress test (NST), and arterial wave-form velocities.

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  • Consideration of novel approaches using fetal responses to auditory and vibratory stimuli.

    • Main Results:

    • A scientific basis exists for fetal testing in the last 10 weeks of human pregnancy.
    • Lack of animal experimental data to support the use of current tests between 0.5 and 0.75 gestation (20-30 weeks).
    • Current behavioral observation methods are time-consuming, labor-intensive, and prone to error.

    Conclusions:

    • Clinicians should exercise caution when interpreting fetal measurements between 20 and 30 weeks' gestation.
    • New methods measuring fetal responses to sound and vibration may offer a more effective approach to fetal health assessment.
    • Vigorous investigation of novel fetal assessment techniques is recommended before clinical implementation.