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  • Title: Histamine's effect on pulmonary vascular resistance and compliance at elevated tone.
    Author: Barman SA, Taylor AE.
    Journal: Am J Physiol; 1989 Aug; 257(2 Pt 2):H618-25. PubMed ID: 2764142.
    Abstract:
    Histamine's effect on the longitudinal resistance and compliance distribution in the canine pulmonary circulation was determined under control and elevated vascular tone using the thromboxane analogue U46619. The arterial-, venous-, and double-occlusion techniques were used in isolated blood-perfused dog lungs at both constant flow and constant pressure. Large and small blood vessel resistances and compliances were studied in lungs given the following treatments: 1) histamine; 2) histamine in lungs pretreated with the H1-receptor antagonist diphenhydramine, and 3) histamine in lungs pretreated with the H2-receptor antagonist cimetidine. The results of this study indicate that histamine constricts small and large veins through H1-receptor mediation at both normal and elevated vascular tone. When vascular tone was elevated, H2-receptor vasodilatation was also apparent in all blood vessel segments. Histamine decreased total, middle compartment, and large vessel vascular compliances by an H1-receptor effect. When vascular tone was elevated, histamine's H1-receptor-mediated vasoconstrictor effect on compliance vessels was less due to the presence of an H2-receptor-mediated vasodilatory system.
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