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Pre-delivery changes in amniotic fluid volume and composition in sheep.

Robert A Brace1, Cecilia Y Cheung

  • 1Department of Reproductive Medicine, University of California San Diego, La Jolla 92093-0802, USA. BobBrace@ucsd.edu

Journal of the Society for Gynecologic Investigation
|May 26, 2005
PubMed
Summary

Amniotic fluid (AF) volume remains constant in fetal sheep with a ligated urachus before delivery. AF solute concentrations change with gestation, influenced by fetal blood and urine.

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Area of Science:

  • Reproductive Biology
  • Fetal Physiology
  • Perinatal Medicine

Background:

  • Amniotic fluid (AF) plays a crucial role in fetal development and well-being.
  • Changes in AF volume and composition during late gestation are indicative of fetal health.
  • The urachus's role in AF dynamics is not fully understood, particularly in species with sustained AF volume.

Purpose of the Study:

  • To investigate the impact of urachal ligation on amniotic fluid volume and solute concentrations in late-gestation fetal sheep.
  • To characterize the temporal changes in AF composition during the final weeks of gestation under these experimental conditions.

Main Methods:

  • Serial measurements of AF volume and solute concentrations (osmolality, sodium, chloride, glucose, calcium, potassium, lactate) in chronically catheterized fetal sheep with ligated urachus.

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  • Fetal urine, fetal blood, and maternal blood solute concentrations were also analyzed.
  • Statistical analysis included regression analysis and ANOVA.

    • Main Results:

    • AF volume remained stable throughout the final 24 days of gestation, irrespective of gestational age or time to delivery.
    • Amniotic fluid osmolality, sodium, chloride, glucose, and calcium decreased with advancing gestation.
    • Amniotic fluid potassium and lactate concentrations increased with gestation, with a notable pre-delivery rise in lactate.

    Conclusions:

    • Urachal ligation in fetal sheep prevents the typical pre-delivery decrease in AF volume seen in some species, aligning with findings in humans and primates.
    • The observed changes in AF solute concentrations suggest gestational age-dependent regulation and contributions from fetal blood and urine.
    • The pre-delivery increase in amniotic lactate may indicate consequences of altered AF volume or metabolic shifts.