Effects of non-bronchoconstrictive doses of inhaled propranolol on airway responsiveness to methacoline
| Autor: | G. L. Biscione, Serafino A. Marsico, Tranfa Cm, F. Bariffi, G. Pelaia, Alessandro Vatrella, G. De Sarro, Roberto Parrella |
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| Přispěvatelé: | A., Vatrella, R., Parrella, G., Pelaia, G. L., Biscione, C. M. E., Tranfa, G. B., DE SARRO, Bariffi, Francesco, S. A., Marsico, Vatrella, A, Parrella, R, Pelaia, G, Biscione, Gl, Tranfa, Carmelindo Mario Enrico, DE SARRO, Gb, Bariffi, F, Marsico, Sa |
| Rok vydání: | 2001 |
| Předmět: |
Adult
Male Allergy Adrenergic beta-Antagonists Bronchi Propranolol methacoline Bronchoconstrictor Agents Airway responsiveness Administration Inhalation asthma medicine Humans Drug Interactions Pharmacology (medical) Methacholine Chloride Asthma Pharmacology Bronchus Dose-Response Relationship Drug Inhalation business.industry General Medicine Middle Aged respiratory system medicine.disease Respiratory Function Tests respiratory tract diseases Dose–response relationship medicine.anatomical_structure Case-Control Studies Anesthesia Toxicity Female Methacholine business medicine.drug |
| Popis: | Objectives: The aim of this study was to evaluate the effects of non-bronchoconstrictive doses of propranolol on airway hyperresponsiveness to methacholine. Methods: Double increasing concentrations (from 0.03 to 64 µg/ml) of inhaled propranolol were administered to a study population which included ten patients with mild asthma, ten rhinitics, and ten healthy control subjects. After the baseline bronchial responses to propranolol and methacholine, expressed as the cumulative provocative dose producing a 20% fall in forced expiratory volume in 1 s (PD20FEV1), were assessed, methacholine challenge was repeated after pretreatment with non-bronchoconstrictive doses of propranolol. Results: The pharmacologically induced β-blockade did not cause any effect in normal individuals, but it worsened airway responsiveness to methacholine in all asthmatics (geometric mean PD20 FEV1: 257 and 87 µg, respectively) and some rhinitics (geometric mean PD20 FEV1: 724 and 446 µg, respectively). Conclusion: Asthmatic patients were extremely sensitive to β-blockers, whereas we observed a variable response to propranolol within the group of rhinitic subjects. This variability in the latter group is possibly because these individuals had different degrees of airway inflammation, increased parasympathetic activity, and β-adrenoceptor dysfunction. |
| Databáze: | OpenAIRE |
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