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Effect of α 2 -Adrenoceptor Stimulation on Functional Parameters of Langendorff-Isolated Rat Heart.
Bulletin of Experimental Biology and Medicine 2018 September
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.
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