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Am J Physiol Heart Circ Physiol 243: H948-H958, 1982;
0363-6135/82 $5.00
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AJP - Heart and Circulatory Physiology, Vol 243, Issue 6 948-H958, Copyright © 1982 by American Physiological Society

ARTICLES

Arterial wall oxygen consumption rate varies spatially

D. G. Buerk and T. K. Goldstick

The ratio of the O2 consumption rate (Q) to the O2 transmissibility (diffusivity-solubility product, Dk) was estimated by curve-fitting O2 tension profiles measured in vascular strips in vitro and in blood vessels in vivo. For rabbit aortic tissue in vitro, Q/Dk was 2.51 +/- 0.28 (SE) X 10(5) Torr/cm2 (n = 9). For various dog vessels in vivo, Q/Dk ranged from 0.15 to 47 X 10(5) Torr/cm2. In most cases, Q/Dk was higher near the endothelium than in the outer wall. This difference appears to be caused by a higher Q. Computer simulations using a two-layer O2 transport model with estimated Q/Dk indicate that the O2 supply from the vasa vasorum is essential to prevent medial wall hypoxia.




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