Journal of cardiovascular pharmacology
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J. Cardiovasc. Pharmacol. · Jan 1986
Respiratory tolerance of bisoprolol and metoprolol in asthmatic patients.
The respiratory tolerance of the beta 1-adrenoceptor-selective blockers bisoprolol and metoprolol was investigated in eight male asthmatic patients. The interaction with the bronchodilatory effect of the beta 2-adrenoceptor-selective agonist terbutaline was studied to compare the beta 1-adrenoceptor selectivity of 10 and 20 mg bisoprolol and 100 mg metoprolol. The three beta-blocker doses caused a significant decrease in heart rate at rest. ⋯ Only 10 mg bisoprolol caused a significant decrease in vital capacity (VC) and forced expiratory volume in 1 s (FEV1). Bronchoconstriction was rapidly reversed by inhalation of terbutaline in all patients. There were no differences between the responses of FEV1, VC, and PEFR to terbutaline with any of the beta-blockers, indicating a good degree of beta 1-adrenoceptor selectivity of 10 and 20 mg bisoprolol and 100 mg metoprolol in humans.