PMID: 22823Nov 10, 1977

Differentiation of cardiac chronotropic and inotropic effects of beta-adrenoceptor agonists

Naunyn-Schmiedeberg's Archives of Pharmacology
E CarlssonB Tångstrand

Abstract

The relative inotropic and chronotropic activity of beta-adrenoceptor agonists was studied in the noradrenaline-depleted, anaesthetized cat. Terbutaline, a selective beta2-adrenoceptor agonist, gave at a certain dose a more pronounced chronotropic than inotropic response, while a new beta1-selective adrenoceptor agonist (-)-H 80/62 produced the same degree of chronotropic and inotropic stimulation. The results indicate that there is some difference between the beta-adrenoceptors in the sinus node mediating chronotropic stimulation and beta-adrenoceptors in the ventricular myocardium mediating stimulation of the contractile force. It has been shown that there are both beta1- and beta2-adrenoceptors in the heart (Carlsson et al., 1972). In the light of this finding it is hypothetized that there are differences in the relative distribution of beta1- and beta2-adrenoceptors in the sinus node and in the myocardium. Athough beta1 is the predominant type of beta-adrenoceptor in both regions, the beta1:beta2 concentration ratio seems to be higher in the myocardium, than in the sinus node.

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