The antiadrenergic action of adenosine was examined in open- and closed-chest preparations of anesthetized rats. The positive inotropic effects of a jugular vein infusion of either isoproterenol or epinephrine were attenuated by phenylisopropyladenosine, an adenosine A1-receptor agonist. 1,3-Dipropyl,8-cyclopentylxanthine, a specific A1-receptor antagonist… (More)
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