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Related Concept Videos

Fetal Circulation01:14

Fetal Circulation

Fetal circulation is a unique system that facilitates the exchange of gases, nutrients, and waste products between the developing fetus and the mother. This intricate process takes place through a special organ called the placenta.
Two umbilical arteries transport blood from the fetus to the placenta. At the placenta, the blood absorbs oxygen and nutrients while simultaneously eliminating waste products. This oxygen-enriched and nutrient-rich blood then returns to the fetus through one...
Fluid Movement Between Compartments01:18

Fluid Movement Between Compartments

The force applied by fluids against a surface, known as hydrostatic pressure, initiates the transfer of fluid among different compartments. Within our blood vessels, the blood's hydrostatic pressure is a result of the heart's pumping action. At the arteriolar end of capillaries, hydrostatic pressure (capillary blood pressure) exceeds the opposing colloid osmotic pressure created primarily by plasma proteins like albumin. This discrepancy in pressure propels plasma and nutrients from the...

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Related Experiment Video

Updated: Jun 25, 2026

Human Fetal Blood Flow Quantification with Magnetic Resonance Imaging and Motion Compensation
06:56

Human Fetal Blood Flow Quantification with Magnetic Resonance Imaging and Motion Compensation

Published on: January 7, 2021

Dynamic fluid shifts induced by fetal bypass.

R Scott Baker1, Christopher T Lam, Emily A Heeb

  • 1Division of Cardiothoracic Surgery, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio 45229-3039, USA.

The Journal of Thoracic and Cardiovascular Surgery
|March 5, 2009
PubMed
Summary

Fetal bypass causes significant fluid shifts, primarily driven by increased vasopressin (hormone) levels, not osmolarity changes. Post-bypass rehydration is crucial for fetal recovery.

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Fetal Echocardiography and Pulsed-wave Doppler Ultrasound in a Rabbit Model of Intrauterine Growth Restriction
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Last Updated: Jun 25, 2026

Human Fetal Blood Flow Quantification with Magnetic Resonance Imaging and Motion Compensation
06:56

Human Fetal Blood Flow Quantification with Magnetic Resonance Imaging and Motion Compensation

Published on: January 7, 2021

Fetal Echocardiography and Pulsed-wave Doppler Ultrasound in a Rabbit Model of Intrauterine Growth Restriction
14:19

Fetal Echocardiography and Pulsed-wave Doppler Ultrasound in a Rabbit Model of Intrauterine Growth Restriction

Published on: June 29, 2013

Area of Science:

  • Perinatal medicine
  • Fetal physiology
  • Cardiovascular research

Background:

  • Fetal bypass is used in interventions, but fluid shifts are poorly understood.
  • Vasopressin is key in fluid balance, but its role during fetal bypass is unclear.

Purpose of the Study:

  • To characterize fluid shifts during fetal bypass.
  • To correlate these shifts with plasma vasopressin concentrations.

Main Methods:

  • Seventeen ovine fetuses underwent bypass; hemodynamics, fluid replacement, and vasopressin levels were monitored.
  • Tissue water content, plasma volume, and osmolarity were assessed.

Main Results:

  • Fetal plasma volume decreased significantly during bypass, requiring substantial fluid replacement.
  • Vasopressin levels increased dramatically and correlated with plasma volume changes, not osmolarity.

Conclusions:

  • Fetal bypass induces significant fluid shifts linked to vasopressin, not osmolarity.
  • The placenta is not the main site of fluid loss.
  • Post-bypass rehydration is essential.