Journal of Applied Physiology AJP: Lung Cellular and Molecular Physiology
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J Appl Physiol 19: 914-918, 1964;
8750-7587/64 $5.00
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Hyperbaric oxygen and persistence of vision in retinal ischemia

R. Carlisle 1, E. H. Lanphier 1, and H. Rahn 1

1 Department of Physiology, State University of New York at Buffalo, Buffalo, New York

When retinal ischemia is produced by elevating the intraocular tension, normal vision persists for about 4 sec in healthy subjects breathing air at atmospheric pressure. Persistence times were determined at alveolar oxygen pressures up to 4 atm abs (3,000 mm Hg), obtained by oxygen breathing in a high-pressure chamber. Below an alveolar Po2 of 2 atm the rise in persistence time is relatively small. Above that level the time increases in direct proportion to the increase in alveolar Po2 and may exceed 50 sec at 4 atm. The rise of persistence time follows a pattern similar to that of computed blood oxygen pressure assuming an oxygen extraction of about 3 vol%.

high pressure; blood oxygen tension; tissue oxygenation; intraocular tension; retinal circulation; visual blackout

Submitted on February 7, 1964




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