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Asymmetric visual deficit at high sustained Gz.

M A Paul1

  • 1Defence and Civil Institute of Environmental Medicine, North York, Ontario, Canada.

Aviation, Space, and Environmental Medicine
|June 1, 1991
PubMed
Summary

Researchers observed asymmetric visual deficits in individuals undergoing high sustained Gz (HSG) acceleration. Transcranial Doppler sonography revealed an abnormal circle of Willis, potentially explaining these visual issues in acceleration research subjects.

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Area of Science:

  • Aerospace Medicine
  • Neurology
  • Physiology

Background:

  • Acceleration research involves exposing individuals to high sustained Gz (HSG) forces.
  • Asymmetric visual deficits have been anecdotally reported in some subjects during HSG exposure.
  • Understanding the physiological basis of these deficits is crucial for subject safety and research integrity.

Observation:

  • A specific centrifuge research subject presented with consistent asymmetric visual deficits during HSG exposure.
  • This subject underwent investigation using transcranial Doppler sonography.
  • The investigation aimed to identify potential underlying physiological causes for the observed visual deficits.

Findings:

  • Transcranial Doppler sonography revealed an abnormal configuration of the circle of Willis in the investigated subject.
  • The abnormal circle of Willis is a network of arteries at the base of the brain.
  • This anatomical variation could impact cerebral blood flow regulation during high Gz exposure.

Implications:

  • An abnormal circle of Willis may predispose individuals to asymmetric visual deficits under HSG conditions.
  • This finding suggests a potential mechanism linking cerebrovascular anatomy to visual disturbances in acceleration environments.
  • Further research is warranted to confirm this association and explore its broader implications for acceleration tolerance and visual health.

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