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Middle cerebral artery Doppler flow velocity waveforms.

J S Woo, S T Liang, R L Lo

    Obstetrics and Gynecology
    |October 1, 1987
    PubMed
    Summary
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    Doppler ultrasound of fetal middle cerebral arteries reveals declining flow velocity ratios with advancing gestational age. This method may help detect fetal compromise and hypoxia by assessing blood flow to the brain.

    Area of Science:

    • Perinatal Medicine
    • Fetal Physiology
    • Diagnostic Ultrasound

    Background:

    • Fetal well-being assessment is crucial during pregnancy.
    • Doppler ultrasound is a non-invasive tool for evaluating fetal circulation.
    • Changes in fetal cerebral blood flow can indicate hypoxic stress.

    Purpose of the Study:

    • To determine how middle cerebral artery (MCA) Doppler flow velocity-time waveforms change with gestational age.
    • To investigate the utility of MCA waveforms in assessing fetal compromise and hypoxia.

    Main Methods:

    • Serial Doppler flow velocity-time waveforms of the MCAs were obtained from 14 pregnant patients.
    • The peak systolic to end-diastolic velocity ratio (A/B ratio) was analyzed.
    • Waveform changes were correlated with gestational age and fetal condition.

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    Main Results:

    • MCA waveforms showed a biphasic pattern with forward diastolic flow.
    • The A/B ratio significantly decreased from 6.89 +/- 1.48 at 25 weeks to 4.23 +/- 0.67 at term.
    • Four fetuses diagnosed with severe antepartum compromise exhibited elevated diastolic velocities and diminished A/B ratios.

    Conclusions:

    • MCA Doppler waveform analysis demonstrates significant changes with advancing gestational age.
    • A declining A/B ratio in MCAs may indicate fetal adaptation to hypoxia.
    • Doppler assessment of MCA waveforms shows potential for evaluating fetal compromise and hypoxia.