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Related Experiment Videos

Amniotic fluid meconium: a fetal environmental hazard

K D Ramin1, K J Leveno, M A Kelly

  • 1Department of Obstetrics and Gynecology, University of Texas Southwestern Medical Center, Dallas, USA.

Obstetrics and Gynecology
|February 1, 1996
PubMed
Summary

Meconium aspiration syndrome in newborns may be linked to acute fetal acidemia during labor, not just a sign of prior fetal distress. This finding suggests meconium in amniotic fluid poses an environmental hazard when combined with acidemia.

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Area of Science:

  • Perinatal Medicine
  • Neonatology
  • Obstetrics

Background:

  • Meconium aspiration syndrome (MAS) is a significant risk for newborns exposed to meconium during labor.
  • The relationship between MAS and fetal acidemia requires further investigation.

Purpose of the Study:

  • To test the hypothesis that MAS is associated with superimposed acute fetal acidemia.
  • To explore the timing and nature of fetal acidemia in relation to MAS.

Main Methods:

  • Analysis of umbilical artery blood gases in 7816 term pregnancies with meconium-stained amniotic fluid.
  • Correlation of blood gas results with intrapartum events and neonatal outcomes.

Main Results:

  • MAS developed in 1% of infants (69/7816).

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  • Fetal acidemia was present at birth in 45% of MAS cases (31/69).
  • Evidence suggests acute fetal acidemia, not chronic, was linked to MAS, challenging the marker hypothesis.

    • Conclusions:

    • Meconium in amniotic fluid may act as a fetal environmental hazard when acute acidemia occurs.
    • MAS is not solely a marker of pre-existing fetal compromise leading to meconium release.