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. 1977 Jun 11;1(6075):1505–1507. doi: 10.1136/bmj.1.6075.1505

Haemodynamic effects of beta-adrenergic blockade in hyperthyroid patients with and without heart failure.

H Ikram
PMCID: PMC1607258  PMID: 871633

Abstract

Haemodynamic studies were performed in 10 patients with uncomplicated thyrotoxicosis and seven with thyrotoxic cardiac failure. The cardiac output of those with uncomplicated hyperthyroidism was higher than normal at rest. After 2 mg of intravenous propranolol there was a 13% fall but the level was still higher than normal. In patients with thyrotoxic cardiac failure the resting cardiac output was normal, but it fell after propranolol by 30% to subnormal levels. In both groups there was an increase in right heart pressures and fall in the rate of increase in arterial pressure, which indicated a decrease in myocardial contractility. These results indicate that increased autonomic activity is a compensatory phenomenon in hyperthyroid heart failure and that its abolition by beta-blocking drugs has a deleterious effect on cardiac function. They are therefore contraindicated in patients with thyrotoxic heart failure.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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