Jeppsson AB, Waldeck B, Widmark E. Further studies on the cardiomegaly induced by beta-adrenoceptor agonists.
ACTA PHARMACOLOGICA ET TOXICOLOGICA 1986;
58:121-5. [PMID:
2871691 DOI:
10.1111/j.1600-0773.1986.tb00080.x]
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Abstract
Rats received continuous infusions of beta-adrenoceptor agonists by means of Alzet osmotic minipumps implanted subcutaneously. After 7 days of isoprenaline infusion (2 mg/kg per day) the heart/body weight ratio increased about 40 per cent compared with placebo treatment. The difference persisted after freeze-drying indicating a true hypertrophy and not merely an oedema. When terbutaline (20 mg/kg per day) was substituted for isoprenaline, the increase in wet weight ratio reached only about 5 per cent. Procaterol (2 mg/kg per day) and pirbuterol (20 mg/kg per day) had no effect on the heart weight. It is concluded that in doses expected to cause comparable stimulation of beta 2-adrenoceptors the unselective agonist isoprenaline is able, more than the beta 2-selective agonists terbutaline, procaterol and pirbuterol to cause cardiac hypertrophy thus indicating the involvement of beta 1-adrenoceptors.
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