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Fetal heart rate decelerations precede a decrease in fetal oxygen content

A Izumi1, H Minakami, I Sato

  • 1Department of Obstetrics and Gynecology, Jichi Medical School, Minamikawachi-machi, Tochigi, Japan.

Gynecologic and Obstetric Investigation
|January 1, 1997
PubMed
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Fetal oxygen saturation (SpO2) declines before birth and can be lowered by severe fetal heart rate decelerations. Maternal oxygen administration effectively increased fetal SpO2 in fetuses with low oxygen levels.

Area of Science:

  • Obstetrics and Gynecology
  • Fetal Medicine
  • Neonatal Physiology

Background:

  • Intrapartum fetal heart rate (FHR) patterns are crucial indicators of fetal well-being.
  • Monitoring fetal oxygen saturation (SpO2) provides direct insight into fetal oxygenation.
  • Understanding the impact of FHR decelerations and maternal interventions on fetal SpO2 is essential.

Purpose of the Study:

  • To investigate the relationship between abnormal FHR patterns, fetal SpO2, and maternal oxygen administration.
  • To assess changes in fetal SpO2 during normal and complicated labor.
  • To evaluate the efficacy of maternal oxygen therapy in improving fetal oxygenation.

Main Methods:

  • 158 intrapartum women were studied, including 120 with normal FHR and 38 with variable FHR decelerations.

Related Experiment Videos

  • A novel reflectance pulse oximetry probe was used for continuous fetal SpO2 monitoring.
  • Maternal oxygen was administered at 5 L/min via nasal cannula for 30 minutes in 32 women.

    • Main Results:

    • Fetal SpO2 remained stable during normal labor but significantly declined shortly before birth.
    • FHR decelerations below 90 bpm preceded the observed decline in fetal SpO2.
    • Maternal oxygen administration increased fetal SpO2 in fetuses with levels below 50%, but not those above 60%.

    Conclusions:

    • Fetal SpO2 naturally decreases near birth and can be reduced by severe variable FHR decelerations.
    • Maternal oxygen therapy at 5 L/min is effective in improving fetal oxygen tension when it is already diminished.