Optimal hematocrit for canine gastric oxygenation

J. W. Kiel, A. P. Shepherd

Research output: Contribution to journalArticle

18 Scopus citations

Abstract

To determine whether an optimal hematocrit exists at which gastric tissue is maximally oxygenated, chambered segments of resting canine stomach were perfused at a constant pressure while hematocrit was decreased in steps from 60 to 10%. The two groups of animals used were a control group and a second group given pentagastrin to elevate metabolic activity. Total blood flow was inversely related to hematocrit in both the control and pentagastrin-treated animals, and arteriovenous oxygen difference was directly related to hematocrit. Consequently, the relationship between gastric oxygen consumption and hematcrit was parabolic in both groups. Therefore, the oxygen uptake vs. hematocrit data from each experiment were fit to a quadratic equation that was used to calculate the maximal oxygen uptake and the optimal hematocrit for each preparation. Both the maximum oxygen uptake and the optimal hematocrit in the pentagastrin-treated group (2.1 ± 0.4 ml · min-1 · 100 g-1 and 45.7 ± 1.4%, respectively). We conclude that an optimal hematocrit exists for the oxygenation of gastric tissue and that it is within the normal hematocrit range under resting conditions. However, the optimal hematocrit is slightly higher than normal during periods of increased metabolic activity.

Original languageEnglish (US)
Pages (from-to)25/2
JournalAmerican Journal of Physiology - Heart and Circulatory Physiology
Volume256
Issue number2
StatePublished - Jan 1 1989

ASJC Scopus subject areas

  • Physiology
  • Cardiology and Cardiovascular Medicine
  • Physiology (medical)

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