Abstract
1 Cardiovascular and airways response to two non-cardioselective beta-adrenoceptor blocking drugs, propranolol and pindolol (with partial agonist activity) and two cardioselective beta-adrenoceptor blocking drugs, acebutolol (with partial agonist activity) and atenolol, were compared in twelve patients with asthma. 2 All four drugs produced a significant reduction in resting pulse rate and prevented the increase in heart rate following inhaled isoprenaline (1,500 microgram). 3 Seven patients in clinical remission showed no significant bronchoconstrictor response to any of the drugs. In the remaining five patients, bronchoconstriction was greatest following propranolol (mean reduction in FEV1 26.6%) and least following atenolol (mean reduction in FEV1 6.5%). 4 The bronchodilator response to inhaled isoprenaline was blocked by propranolol and pindolol but not by acebutolol and atenolol. 5 Partial agonist activity did not appear to be clinically useful.
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Selected References
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