Effect of α<inf>2</inf>-Adrenoceptor Stimulation on Functional Parameters of Langendorff-Isolated Rat Heart

© 2018, Springer Science+Business Media, LLC, part of Springer Nature. We studied the effect of α2-adrenoreceptor agonist clonidine hydrochloride in concentrations of 10—9-10—6 M on inotropy, chronotropy, and coronary flow in Langendorff-isolated heart of adult rats. It was found that α2-adrenoreceptor agonist changed all studied parameters. Left ventricular myocardium contraction force decreased after application of all tested concentrations, the maximum effect was observed at a concentration of 10—6 M. Stimulation of α2-adrenergic receptors in concentrations of 10—8, 10—7, and 10—6 M produced a two-phase effect (initial increase and a subsequent decrease) on the coronary flow. Clonidine hydrochloride in the maximum concentration (10—6 M) caused a decrease in HR in one group and an increase in the other