Comparison of the Effect of the ?1-Blocking Drugs Atenolol and Metoprolol on Bronchial Asthma

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Abstract
Twenty patients with severe or medium severe asthma were given atenolol (Atenol ICI-Pharma) and/or metoprolol (Seloken Hassle) for tachycardia, hyperkinetic tremor, arterial hypertension or symptoms of angina pectoris. These cardioselective .beta.-blocking drugs caused only a very slight decrease in PF [peak flow] values. There was no difference between the atenolol and metoprolol PF values. A 24 h dose of 100 mg atenolol caused a distinct fall in diastolic pressure as compared with the same amount of metoprolol. Both these 2 .beta.1-blockers moderated the tachycardia which occurs in asthma; atenolol in this dose had a slightly stronger action. The subjective condition of 5 patients with severe or medium severe asthma was considerably relieved by atenolol and/or metoprolol. The relief manifested as a lessening of dyspnea and improvement of the general status. No essential change was observed in the PF values despite the subjective effects. The most noteworthy change was the amelioration of tachycardia which had continued longer than expected in these patients. The heart rate dropped from 140-120/min to 90-70/min and dyspnea was relieved at the same time.