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Related Experiment Video

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Author Spotlight: Advancing Cancer Associated Thrombosis Research in Rodent Models
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Abdominal venous system in the normal fetus

G Mari1, B Uerpairojkit, J A Copel

  • 1Department of Obstetrics and Gynecology, Yale University School of Medicine, New Haven, Connecticut, USA.

Obstetrics and Gynecology
|November 1, 1995
PubMed
Summary

Normal fetal abdominal venous system flow patterns were identified. Veins leading to the liver show continuous flow, with specific patterns for the umbilical sinus, ductus venosus, and those entering the inferior vena cava.

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Area of Science:

  • Fetal Medicine
  • Vascular Ultrasound
  • Pediatric Cardiology

Background:

  • Assessing fetal venous circulation is crucial for understanding fetal well-being.
  • Doppler ultrasound is a primary tool for evaluating fetal hemodynamics.

Purpose of the Study:

  • To characterize normal flow velocity waveform patterns in the fetal abdominal venous system.
  • Establish reference data for fetal venous Doppler studies.

Main Methods:

  • Doppler ultrasound was used to study 67 normal fetuses (17-42 weeks gestation).
  • Flow velocity waveforms were analyzed in 13 specific abdominal veins, including the umbilical vein, portal vein, ductus venosus, and inferior vena cava.

Main Results:

  • Five distinct flow velocity waveform patterns were observed: continuous, monophasic, biphasic, triphasic, and tetraphasic.
  • Continuous flow was noted in veins leading to the liver (except umbilical sinus).
  • Specific patterns were identified for the umbilical sinus (monophasic), ductus venosus (biphasic), and veins entering the inferior vena cava (triphasic).

Conclusions:

  • Normal fetal abdominal venous flow exhibits distinct, predictable patterns.
  • These findings provide a baseline for identifying abnormal venous circulation in fetuses.
  • Understanding these patterns aids in prenatal diagnosis and management of fetal cardiovascular conditions.