Inhibition of thromboxane synthesis reduces endotoxin-induced right ventricular failure in sheep

G. Redl, S. Abdi, L. D. Traber, R. J. Nichols, J. T. Flynn, D. N. Herndon, D. L. Traber

Research output: Contribution to journalArticlepeer-review

13 Scopus citations


Background and Methods: There is a marked decrease of the right ventricular ejection fraction after the administration of a bolus of endotoxin to sheep. This hemodynamic response may be the result of thromboxane-mediated pulmonary hypertension. Right ventricular function was studied in an ovine model after the administration of endotoxin (1 μg/kg Escherichia coli) with and without pretreatment with OKY-046, a selective thromboxane synthetase inhibitor. Results: OKY-046 attenuated the endotoxin-induced increase in pulmonary arterial pressure and prevented the early decreases in right ventricular ejection fraction and cardiac output. However, thromboxane synthetase inhibition failed to prevent endotoxin-induced hypoxemia. The marked increase in plasma thromboxane concentrations, which is usually seen after the administration of endotoxin, was prevented by pretreating the animals with OKY-046. On the other hand, increased plasma prostacyclin concentrations were observed in sheep treated with the thromboxane synthetase inhibitor. Conclusion: This series of experiments shows that the early endotoxin-induced decrease in right ventricular ejection fraction can be alleviated by the application of OKY-046.

Original languageEnglish (US)
Pages (from-to)1294-1302
Number of pages9
JournalCritical care medicine
Issue number10
StatePublished - 1991


  • Blood gas analysis
  • Cardiac output
  • Catheterization
  • Endotoxin
  • Hypertension
  • Oxygen consumption
  • Sheep
  • Thermodilution
  • Thromboxane
  • Vascular resistance

ASJC Scopus subject areas

  • Critical Care and Intensive Care Medicine


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