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  • Title: Role of the endocardium in the inotropic action of UD-CG-212 CL.
    Author: Meulemans AL, Brutsaert DL.
    Journal: Eur J Pharmacol; 1991 Sep 04; 202(1):45-9. PubMed ID: 1686255.
    Abstract:
    UD-CG-212 CL is a metabolite of pimobendan (UD-CG-115 BS), a non-glycosidic, non-adrenergic positive inotropic agent. In the present study we investigated the effect of UD-CG-212 CL on cat papillary muscles in the presence or absence of an intact endocardial endothelium. The endocardium was damaged by a very short detergent treatment. We demonstrated that, in muscles with an intact endocardial endothelium, UD-CG-212 CL induced a moderate, but significant inotropic effect resembling the changes induced by adrenoceptor agonists. Addition of an alpha- and or beta-blocker reduced this positive inotropic effect. The effect induced by UD-CG-212 CL, was completely abolished after the endocardial endothelium was damaged. We conclude that the endocardium played a modulatory role in the action of UD-CG-212 CL through the release of various factors with inotropic activity.
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