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Conflicting data on intervillous circulation in early pregnancy
A Kurjak1, S Kupesic, T Hafner
1Department of Obstetrics and Gynecology, Sveti Duh General Hospital, School of Medicine, University of Zagreb, Croatia.
Journal of Perinatal Medicine
|January 1, 1997
Summary
Early pregnancy intervillous circulation is present, contrary to previous beliefs. Advanced Doppler technology confirms blood flow in the intervillous space during the first trimester.
Area of Science:
- Embryology
- Maternal-Fetal Medicine
- Obstetrics
Background:
- The classic view posits intervillous circulation develops gradually through trophoblastic invasion and spiral artery opening.
- This concept was challenged by studies suggesting absent intervillous blood flow before 12 weeks of gestation.
Purpose of the Study:
- To investigate the presence and timing of intervillous circulation in early pregnancy.
- To reconcile conflicting findings regarding first-trimester intervillous blood flow.
Main Methods:
- Review of classic embryological concepts.
- Analysis of findings from recent studies utilizing advanced color Doppler technology.
Main Results:
- Recent studies using sensitive color Doppler devices have detected intervillous circulation in the first trimester.
- This contradicts earlier research that suggested its absence before 12 weeks.
Conclusions:
- Intervillous circulation is established earlier in the first trimester than previously thought.
- Modern Doppler ultrasound confirms early-onset intervillous blood flow, challenging older models.
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