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Fetal in vivo continuous cardiovascular function during chronic hypoxia.

B J Allison1, K L Brain1, Y Niu1

  • 1Department of Physiology, Development & Neuroscience, University of Cambridge, Downing Street, Cambridge, CB2 3EG, UK.

The Journal of Physiology
|March 2, 2016
PubMed
Summary

Chronic hypoxia in fetal sheep redirects oxygen and glucose to vital organs, increasing fetal plasma urate. This study reveals how the fetal cardiovascular system adapts to prolonged low oxygen conditions.

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Area of Science:

  • Fetal Physiology
  • Cardiovascular Research
  • Hypoxia Studies

Background:

  • Fetal cardiovascular response to acute hypoxia is well-understood.
  • The impact of chronic hypoxia on fetal cardiovascular function remains understudied.
  • Existing knowledge gaps highlight the need for research into prolonged hypoxic conditions.

Purpose of the Study:

  • To investigate the in vivo longitudinal changes in fetal cardiovascular function under chronic hypoxia.
  • To measure fetal blood flow, pressure, and heart rate in response to prolonged gestation under hypoxia.
  • To determine alterations in oxygen and glucose delivery to fetal circulations during chronic hypoxia.

Main Methods:

  • Developed isobaric hypoxic chambers to maintain pregnant sheep under controlled hypoxia (10% O2).
  • Utilized a wireless data acquisition system to record fetal blood flow, pressure, and heart rate in freely moving ewes.
  • Measured fetal carotid and femoral blood flow, oxygen, and glucose delivery during the last third of gestation.

Main Results:

  • The ratio of oxygen and glucose delivery to the fetal carotid artery increased significantly compared to the femoral circulation during chronic hypoxia.
  • Oxygen and glucose delivery ratios remained unchanged in normoxic control fetuses.
  • Fetal plasma urate concentration significantly increased in chronically hypoxic fetuses.

Conclusions:

  • Chronic hypoxia induces a persistent redistribution of substrate delivery towards essential fetal circulations.
  • This adaptation is associated with increased reactive oxygen species, potentially via xanthine oxidase.
  • Findings provide critical insights into fetal cardiovascular adaptation to prolonged hypoxic stress.