Evidence for improved myocardial oxygen delivery and function during hypoxia in the mole rat

Y. Edoute, R. Arieli, E. Nevo

Research output: Contribution to journalArticlepeer-review

Abstract

The high capillary density of the hypoxic adapted mole rat may provide an efficient oxygen extraction system that permits the maintenance of a normal metabolic rate during hypoxia. We compared myocardial function and energetics in the isolated working heart of the mole rat with that of the white rat during oxygenation (567 torr O2) and 3 hypoxic periods of 319, 232 and 155 torr O2, each followed by a reoxygenation period. Control hearts were perfused for a similar time but with oxygenated buffer. The control oxygenated mole rat heart had higher coronary flow (CF), systolic pressure and myocardial O2 consumption {Mathematical expression} and lower coronary resistance compared with the heart of the white rat. The hypoxic heart of the mole rat had higher CF, aortic flow, stroke volume, {Mathematical expression}, mechanical power and efficiency, and lower coronary resistance compared with the hypoxic heart of the white rat. The better performance of the hypoxic mole rat heart was not due to a more efficient O2 extraction but was associated with a lower coronary resistance. The findings correlate with the known cardiac physiology of the intact mole rat.

Original languageEnglish
Pages (from-to)575-582
Number of pages8
JournalJournal of Comparative Physiology B: Biochemical, Systemic, and Environmental Physiology
Volume158
Issue number5
DOIs
StatePublished - Sep 1988

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Endocrinology
  • Animal Science and Zoology
  • Physiology
  • Biochemistry

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