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Muscle perfusion and oxygenation during local hyperoxia.

D L Bredle1, W E Bradley, C K Chapler

  • 1Department of Physiology and Biophysics, University of Alabama, Birmingham 35294.

Journal of Applied Physiology (Bethesda, Md. : 1985)
|November 1, 1988
PubMed
Summary

Hyperoxia (HiOx) directly restricts blood flow and oxygen distribution in isolated dog hindlimbs, with anemia worsening these effects. Constant flow perfusion partially countered these impacts.

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Area of Science:

  • Physiology
  • Cardiovascular Science
  • Muscle Metabolism

Background:

  • Previous studies indicated that ventilation with oxygen decreases muscle oxygen uptake (VO2).
  • The precise mechanism and localized effects of hyperoxia on muscle VO2 remain unclear, especially during anemia.

Purpose of the Study:

  • To investigate if hyperoxia (HiOx) has a direct, localized effect on hindlimb muscle oxygen consumption.
  • To determine the influence of anemia on hyperoxia-induced changes in limb hemodynamics and VO2.

Main Methods:

  • Isolated dog hindlimb muscles were perfused with hyperoxic blood (PO2 > 500 Torr).
  • Experiments utilized both constant-flow and constant-pressure perfusion protocols.
  • Anemia was induced in half the dogs (hematocrit ~15%) to create four experimental groups.

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Main Results:

  • Hyperoxia increased hindlimb vascular resistance and venous PO2 across all groups.
  • In constant-pressure perfusion, limb blood flow and VO2 decreased by ~20% regardless of hematocrit.
  • Under constant-flow conditions, limb VO2 was maintained in anemic dogs and increased in normocythemic dogs during hyperoxia.

Conclusions:

  • Hyperoxia directly causes vascular smooth muscle constriction, leading to restricted blood flow and maldistribution.
  • Constant flow perfusion can offset hyperoxia-induced flow restrictions, though increased VO2 may indicate toxicity.
  • Anemia exacerbates the microcirculatory maldistribution caused by hyperoxia.