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Effect of ICI 118551 on bronchial beta‐adrenoceptor function and exercise heart rate in normal man.
Author(s) -
Tattersfield AE,
Cragg DJ
Publication year - 1983
Publication title -
british journal of clinical pharmacology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.216
H-Index - 146
eISSN - 1365-2125
pISSN - 0306-5251
DOI - 10.1111/j.1365-2125.1983.tb02226.x
Subject(s) - propranolol , salbutamol , heart rate , medicine , beta (programming language) , placebo , endocrinology , atenolol , asthma , cardiology , blood pressure , alternative medicine , pathology , computer science , programming language
To determine whether the beta 2‐selectivity of ICI 118551 extended to human airways, we measured bronchial beta‐adrenoceptor blockade and the reduction in exercise heart rate in six normal subjects on different occasions after ingestion of ICI 118551 20 or 50 mg, propranolol 40 mg or placebo in random order. Bronchial beta‐adrenoceptor blockade after each active drug was measured as the displacement of the airway dose‐ response curve to salbutamol and expressed as a dose ratio. Exercise heart rate was measured during the fifth minute of steady state exercise at 70% of the subject's maximum work load. The mean dose ratios for the salbutamol airway dose‐response curves following ICI 118551 20 and 50 mg and propranolol 40 mg were 11, 55 and 48 respectively. The mean reductions in exercise heart rate for the three drugs were 0.6, 6.6 and 16.6% respectively. These results confirm that the beta 2‐selectivity of ICI 118551 includes airway beta 2‐ adrenoceptors in man.