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Fetal gastrointestinal composition: implications for water and electrolyte absorption
D J Sherman1, M G Ervin, M G Ross
1Department of Obstetrics and Gynecology, Harbor-UCLA Medical Center, Torrance 90509, USA.
Reproduction, Fertility, and Development
|January 1, 1996
Summary
Fetal gastrointestinal tracts resorb large amniotic fluid volumes, similar to adults. However, near-term fetal colonic sodium absorption appears immature or suppressed.
Area of Science:
- Fetal Physiology
- Gastrointestinal Physiology
Background:
- Late-gestation fetuses swallow large amniotic fluid volumes, exceeding adult intake.
- This fluid is resorbed in the fetal gastrointestinal (GI) tract, forming meconium.
- Sites and mechanisms of fetal GI water resorption are poorly understood.
Purpose of the Study:
- To investigate water and electrolyte absorption in the ovine fetal GI tract.
- To determine the composition of GI contents from the rumen to the distal colon.
Main Methods:
- Analysis of GI luminal contents from 13 ovine fetuses (121-148 days gestation).
- Samples analyzed for water, organic content, osmolality, and electrolytes.
- Fetal GI tracts were ligated in sections to isolate luminal contents.
Main Results:
- Significant decrease in water content and increase in organic content from rumen to colon.
- Osmolality increased from the rumen to the distal small intestine, returning to isotonic levels in the colon.
- Fetal colonic sodium absorption was found to be suppressed or immature near term.
Conclusions:
- The ovine fetal GI tract demonstrates significant water absorption, mirroring adult patterns.
- Water absorption occurs along the length of the fetal GI tract.
- Immature or suppressed colonic sodium absorption in the near-term fetus warrants further investigation.