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- W2006343870 abstract "Complete in vitro dose-response curves for l-isoproterenol (isoprenaline) sulfate showed no functional defects in bronchial muscular β-adrenergic receptors in three patients with chronic intrinsic asthma, as compared to 60 patients with normal pulmonary function. Complete in vivo dose-response curves for intravenously infused isoproterenol were obtained in eight outpatients with chronic intrinsic asthma to register effects on bronchial muscle (forced expiratory volume in one second), heart rate, blood pressure, and skeletal muscular tremor. The isoproterenol test was performed before and also during oral treatment with a long-acting selective β-adrenergic stimulator (terbutaline sulfate, 5 mg three times daily). The study was performed over 12 months to avoid seasonal variation in basal levels of obstruction and was concluded by adding inhaled terbutaline (two inhalations four times daily) to oral therapy. No “resistance” developed in bronchial β-adrenergic receptors during this prolonged treatment. Inhalation therapy in addition to oral therapy improved bronchodilation without causing resistance. Even six inhalations given four times daily (four-to five-hour intervals) did not cause any bronchial resistance; however, resistance developed in skeletal muscles with decreased tremor and in cardiac β-adrenergic receptors. Complete in vitro dose-response curves for l-isoproterenol (isoprenaline) sulfate showed no functional defects in bronchial muscular β-adrenergic receptors in three patients with chronic intrinsic asthma, as compared to 60 patients with normal pulmonary function. Complete in vivo dose-response curves for intravenously infused isoproterenol were obtained in eight outpatients with chronic intrinsic asthma to register effects on bronchial muscle (forced expiratory volume in one second), heart rate, blood pressure, and skeletal muscular tremor. The isoproterenol test was performed before and also during oral treatment with a long-acting selective β-adrenergic stimulator (terbutaline sulfate, 5 mg three times daily). The study was performed over 12 months to avoid seasonal variation in basal levels of obstruction and was concluded by adding inhaled terbutaline (two inhalations four times daily) to oral therapy. No “resistance” developed in bronchial β-adrenergic receptors during this prolonged treatment. Inhalation therapy in addition to oral therapy improved bronchodilation without causing resistance. Even six inhalations given four times daily (four-to five-hour intervals) did not cause any bronchial resistance; however, resistance developed in skeletal muscles with decreased tremor and in cardiac β-adrenergic receptors." @default.
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- W2006343870 title "Development of “Resistance” in Beta-Adrenergic Receptors of Asthmatic Patients" @default.
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- W2006343870 doi "https://doi.org/10.1378/chest.69.4.479" @default.
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