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[Autoregulation in the choroid].

Y Yüksel1, H Thölen, R Meier

  • 1Universitätsaugenklinik Zürich.

Klinische Monatsblatter Fur Augenheilkunde
|May 1, 1992
PubMed
Summary
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Cerebral blood flow is sensitive to carbon dioxide levels. This study investigated if ocular blood flow responds similarly, finding the choroid maintains constant blood volume despite CO2 changes.

Area of Science:

  • Ophthalmology
  • Physiology
  • Neuroscience

Context:

  • Cerebral perfusion is highly sensitive to arterial partial pressure of carbon dioxide (pCO2).
  • The relationship between ocular perfusion and pCO2 is not well understood.
  • Investigating ocular hemodynamics under varying CO2 conditions is crucial for understanding visual system regulation.

Purpose:

  • To determine if ocular perfusion, specifically choroidal blood volume, is sensitive to changes in arterial pCO2.
  • To compare the cerebrovascular response to CO2 with the ocular vascular response.

Summary:

  • This study measured capillary pCO2 and retinal tissue hemoglobin content (redness/pallor) using transcutaneous sensors and the Ocular Photometer (OPM) before and after 10% CO2 inhalation.
  • Measurements were taken in young volunteers and patients with carotid stenosis.

Related Experiment Videos

  • Results indicate that the choroid maintains a constant blood volume despite changes in CO2 levels, suggesting a different regulatory mechanism compared to cerebral circulation.

    • Impact:

    • Provides novel insights into the autoregulation of ocular blood flow.
    • Suggests that the choroid may have a more stable blood volume regulation than previously thought.
    • Highlights potential differences in vascular control between the brain and the eye, with implications for ophthalmological and neurological conditions.