August 1967
Volume 6, Issue 4
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Articles  |   August 1967
Changes in Arterial pCO2 and Retinal Vessel Size with Oxygen Breathing
Author Affiliations
  • BANKS ANDERSON, Jr.
    Departments of Ophthalmology and Medicine, Duke University Medical Center, Durham, N. C; and the Department of Medicine, Indiana University Indianapolis, Ind.
  • HERBERT A. SALTZMAN
    Departments of Ophthalmology and Medicine, Duke University Medical Center, Durham, N. C; and the Department of Medicine, Indiana University Indianapolis, Ind.
  • REGINA FRAYSER
    Departments of Ophthalmology and Medicine, Duke University Medical Center, Durham, N. C; and the Department of Medicine, Indiana University Indianapolis, Ind.
Investigative Ophthalmology & Visual Science August 1967, Vol.6, 416-419. doi:
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      BANKS ANDERSON, HERBERT A. SALTZMAN, REGINA FRAYSER; Changes in Arterial pCO2 and Retinal Vessel Size with Oxygen Breathing. Invest. Ophthalmol. Vis. Sci. 1967;6(4):416-419.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract

Arterial blood gas and pH measurements were correlated with changes in retinal vessel diameterin healthy young men during oxygen breathing at elevated atmospheric pressure and during hyperventilation at normal atmospheric pressure. The marked retinal vasoconstriction observed with oxygen breathing was not the result of simultaneous arterial hypocapnia. Hypocapnia produced by hyperventilation while breathing air was not as effective in producing retinal vasoconstriction as was hyperoxia without hyperventilation. These conclusions apply to vessels large enough to be measured on fundus photographs and do not necessarily apply to the smaller vessels and capillaries or to the choroidal vessels.

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