The effect of beta-adrenoceptor blocking agents, with differing ancillary properties, on the arrhythmias resulting from acute coronary artery ligation in anaesthetized rats

British Journal of Pharmacology
C A Campbell, J R Parratt


The effects of several beta-adrenoceptor blocking agents, [+), (-) and (+/-)-oxprenolol, p-oxprenolol, practolol, propranolol and timolol) were investigated on the ventricular arrhythmias occurring within the first 30 min of acutely ligating the main left coronary artery in anaesthetized rats. The degree of cardiac and vascular beta-adrenoceptor blockade was also assessed. All the compounds exhibited antiarrhythmic activity under these conditions. The degree of cardiac beta-adrenoceptor blockade required for this protection was less for the cardioselective agents, p-oxprenolol and practolol, than for the non-selective beta-adrenoceptor blocking agents. A comparison of the two isomers of oxprenolol demonstrated that the (-)-isomer markedly suppressed ischaemic arrhythmias (ventricular ectopic beats, incidence and duration of ventricular tachycardia and duration of ventricular fibrillation) more effectively than the (+)-isomer. Compounds possessing intrinsic sympathomimetic activity (ISA) caused less marked haemodynamic changes (in equivalent beta-blocking doses) than those that did not possess this ancillary property. The membrane stabilizing activity of oxprenolol and p-oxprenolol did not appear to contribute to the antiarrhyth...Continue Reading


Jun 1, 1979·Proceedings of the Society for Experimental Biology and Medicine·Z J BosnjakJ P Kampine
Apr 1, 1965·British Journal of Pharmacology and Chemotherapy·A MORALES AGUILERA, E M VAUGHANWILLIAMS


Oct 20, 2009·Basic Research in Cardiology·Dimitrios L OikonomidisTheofilos M Kolettis
Apr 16, 1985·European Journal of Pharmacology·D W HarronW Kobinger
Jan 1, 1985·Molecular Aspects of Medicine·J H BottingM J Walker
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Apr 7, 2017·Journal of Cardiovascular Pharmacology and Therapeutics·Laura A HundahlThomas Jespersen
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Related Concepts

Adrenergic beta-Antagonists
Anesthesia Procedures
Cardiac Depressants
Cardiac Arrhythmia
Plasma Membrane
Sinus Node Artery
August Rats

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