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Related Experiment Videos

The fetal breath cycle.

B J Trudinger1, C M Cook

  • 1Fetal Welfare Laboratory, University of Sydney, Westmead Hospital, N.S.W., Australia.

Early Human Development
|March 1, 1990
PubMed
Summary
This summary is machine-generated.

Fetal breathing patterns, precisely timed using umbilical vein Doppler ultrasound, show significant changes with advancing gestation. Inspiratory time and breath amplitude increase, while variability decreases, indicating developmental shifts in fetal respiratory control.

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Area of Science:

  • Perinatology
  • Fetal Physiology
  • Diagnostic Ultrasound

Background:

  • Fetal breathing movements (FBMs) are crucial for respiratory development.
  • Umbilical vein flow velocity profiles offer a non-invasive method to assess FBMs.
  • Understanding FBM development is key to assessing fetal well-being.

Purpose of the Study:

  • To precisely time fetal breathing movements using Doppler ultrasound.
  • To investigate changes in FBM patterns throughout gestation.
  • To correlate FBM changes with fetal respiratory development and control.

Main Methods:

  • Serial Doppler ultrasound studies on eight normal fetuses from 28 weeks gestation to delivery.
  • Measurement of inspiratory time, total breath time, and breath amplitude.

Related Experiment Videos

  • Calculation of the umbilical vein sonogram area as a measure of respiratory work.

    • Main Results:

    • A distinct evolution in FBM patterns was observed with advancing gestation.
    • Inspiratory time and breath amplitude significantly increased.
    • Variability in FBM measures decreased, and the ti/ttotal ratio lengthened.
    • Respiratory work, measured by sonogram area, increased with gestation.

    Conclusions:

    • The changing pattern of FBMs reflects developmental changes in the fetal central respiratory control.
    • These findings parallel observations in newborn respiratory patterns.
    • Doppler ultrasound provides precise, quantitative data on fetal respiratory development.