Effect of Propranolol on Myocardial Cell Necroses and Blood Levels of Catecholamines in Pigs Subjected to Stress
- 13 March 2009
- journal article
- research article
- Published by Wiley in Acta Pharmacologica et Toxicologica
- Vol. 50 (1), 58-66
- https://doi.org/10.1111/j.1600-0773.1982.tb00940.x
Abstract
The degree of myocardial cell necroses in pigs exposed to stress induced by a myorelaxant (succinylcholine) for .apprx. 12 min was investigated. The .beta.-adrenoceptor blocker propranolol was given in varying doses prior to the induced stress. The degree of necroses in these pigs was evaluated according to a point scale, ranging from 0-6 points, and compared with the changes found in untreated controls following stress. The blood levels of noradrenaline [norepinephrine] and adrenaline [epinephrine] were assayed before, during and immediately after the period of stress. No protective effect of propranolol on the cardiac lesions was found when the drug was administered i.v. in a single dose of either 1 mg or 3 mg/kg. During the period of stress the blood levels of noradrenaline were high, indicating a high degree of activity in the sympatho-adrenal system. Propranolol in a single dose of 10 mg/kg i.v. reduced the number and size of heart lesions, while the blood levels of the catecholamines were lower under stress than after administration of 1 and 3 mg propranolol. After oral treatment with propranolol, 120 mg 3 times a day for 6 or 7 days, an almost complete absence of heart cell necrosis after the stress was obtained. The activity of the sympatho-adrenal system was elevated as reflected by the high blood levels of catecholamines. Stress-induced heart cell necrosis is mediated via the activity of the sympatho-adrenal system. The difference between single and repeated doses of propranolol in protecting the heart suggests a complex action of the adrenergic .beta.-receptor blocker.Keywords
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