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BACKGROUND: Soluble pulmonary vasoconstrictors released in response to hypoxia have been reported in pig and rat preparations, but not in rabbit preparations. METHODS: We used myography to evaluate the contribution of a soluble factor to constriction in rabbit small pulmonary arteries (external diameter 300-475 microm) exposed to 45 min hypoxia (PO(2)=9 mm Hg). RESULTS: Hypoxia produced gradually intensifying constriction. Return to euoxia (PO(2)=145 mm Hg) for 30 min relaxed only approximately 30% of the constriction, whereas elution of the myograph bath yielded full relaxation. Reapplication of the eluent gradually restored the constriction to its pre-elution level over a 30-min period. CONCLUSIONS: In this closed system, a soluble factor contributes substantially to hypoxic pulmonary vasoconstriction.


Journal article


Br J Anaesth

Publication Date





592 - 594


Animals, Anoxia, Male, Pulmonary Artery, Rabbits, Solubility, Vasoconstriction, Vasoconstrictor Agents