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In-utero defecation: fact or fiction?
A O Ciftçi1, F C Tanyel, I Karnak
1Department of Pediatric Surgery, Hacettepe University Medical Faculty, Ankara, Turkey.
Summary
Fetal defecation is a natural process. Radionuclide imaging in rabbit fetuses showed radiopharmaceutical passage into amniotic fluid, confirming in-utero gastrointestinal motility and excretion.
Area of Science:
- Experimental Medicine
- Fetal Physiology
- Nuclear Medicine
Background:
- Gastrointestinal motility and defecation in utero are not fully understood.
- Investigating fetal physiological processes requires reliable experimental models.
Purpose of the Study:
- To investigate fetal gastrointestinal motility.
- To determine if in-utero defecation occurs in fetuses.
- To assess the passage of substances into the amniotic fluid.
Main Methods:
- Utilized radionuclide techniques with Technetium-99m (99mTc)-HIDA in New Zealand white rabbit fetuses.
- Administered 99mTc-HIDA via intramuscular injection to fetuses at 25 days' gestation.
- Compared a control group (Group A) with a group with surgically closed anuses (Group B).
- Measured radioactivity in fetal organs, gastrointestinal tract, and amniotic fluid over 24 hours.
Main Results:
- 99mTc-HIDA was primarily taken up by the liver and excreted into the gastrointestinal tract in both groups.
- Passage of radioactivity into the amniotic fluid was observed exclusively in Group A (control group).
- Low radioactivity in Group B's amniotic fluid indicated urinary excretion, validating the model's reliability.
Conclusions:
- Demonstrated intestinal transport of a radiopharmaceutical in fetal rabbits.
- Passage into amniotic fluid in the control group strongly suggests fetal defecation is a physiological event.
- The experimental model reliably assessed fetal gastrointestinal function and excretion.