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Chronotropic, inotropic and coronary effects of Y-27632 ((+)-(R)-trans-4-(1-aminoethyl)-N-(4-pyridyl) cyclohexanecarboxamide dihydrochloride, monohydrate), a specific inhibitor of Rho-associated coiled-coil forming protein serine/threonine kinase (ROCK), were assessed using canine isolated, blood-perfused heart preparations. Y-27632 slightly enhanced sinoatrial automaticity and significantly increased coronary blood flow, while it decreased ventricular contraction. The concentrations of Y-27632 needed to cause the currently observed changes were similar to those inhibiting ROCK in a previous in vitro study. These results suggest that the constitutional ROCK in the heart mainly regulates the ventricular contractility and coronary vascular tone rather than the sinoatrial automaticity.

Cardiac Effects of a Selective Rho-Associated Kinase Inhibitor, Y-27632, Assessed in Canine Isolated, Blood-Perfused Heart Preparations