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- W2162640997 abstract "1. The intrinsic sympathomimetic activity of a range of beta-adrenoceptor antagonists and its relationship to beta-adrenoceptor blockade was studied in pentobarbitone-anaesthetized, vagotomized rats which had been depleted of catecholamines by pretreatment with syrosingopine. Dichlorisoprenaline, practolol, oxprenolol, pindolol and acebutolol, produced dose-dependent positive chronotropic responses in this preparation. 2. The relationship between the dose requirements for this intrinsic sympathomimetic activity and beta-adrenoceptor-blocking activity was not the same for all drugs: (i) dichlorisoprenaline and practolol had intrinsic activity at all beta-adrenoceptor-blocking doses; and (ii) oxprenolol, pindolol and acebutolol had predominantly beta-adrenoceptor blockade at the lower dose levels and agonist activity only became significant at high doses relative to those producing beta-adrenoceptor blockade. 3. The positive chronotropic response to both practolol and pindolol was observed in rats which had been pithed and was antagonized by propranolol (0.1-3.0 mg/kg, i.v.), indicating that beta-adrenoceptors were involved. 4. It was concluded that the intrinsic sympathomimetic activity of beta-adrenoceptor antagonists was not a simple property as it was described by the relationship between the dose requirements for intrinsic sympathomimetic activity and for beta-adrenoceptor blockade as well as the degree of partial agonist activity." @default.
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- W2162640997 date "1979-02-01" @default.
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- W2162640997 title "A study of the relationship between cardiac ?-adrenoceptor blockade and intrinsic sympathomimetic activity in rats depleted of catecholamines" @default.
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- W2162640997 doi "https://doi.org/10.1111/j.1440-1681.1979.tb00001.x" @default.
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