from these experiments , the magnitude of the pressor action of beta-adrenoceptor blocking drugs in anesthetized rats was found to be more closely related to the magnitudes of inhibition produced by beta-adrenoceptor blocking drugs on isoprenaline-induced relaxation of isolated guinea pig trachea and on isoprenaline-induced vasodilation in anesthetized rats than to those on isoprenaline-induced positive chronotropic and inotropic actions of isolated atria .
C0022245
isoprenaline
C1372804
positive chronotropic