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- W2016203527 abstract "With an increased awareness of the importance of bronchial hyperreactivity on the clinical state of asthma, efforts at establishing effective treatment for asthma have been aimed at trying to reduce the level of bronchial hyperreactivity. This study investigated whether or not theophylline at different serum concentrations had any effect on bronchial hyperreactivity, as measured by methacholine challenges. Twelve adult subjects with mild asthma participated. All subjects were atopic and were nonsmokers. Subjects were studied on three separate occasions according to a double-blind, randomized, crossover study design with one of the following medications: two placebo capsules in the morning and evening, a placebo and 250 mg of sustained-release theophylline in the morning and evening, or two 250 mg sustained-release theophylline capsules each morning and evening. Subjects were administered their medication between 5 and 15 days before performing methacholine challenges in the morning at the presumed trough level, and in the afternoon at the presumed peak serum theophylline level. Despite statistically significant differences in the pulmonary function and theophylline levels between the two active dosages (p less than 0.05 for both), there was no difference in methacholine sensitivity at the time of ingestion of the two dosage forms. There was also no correlation between a particular theophylline level and degree of methacholine sensitivity. It was concluded that, although theophylline has significant bronchodilator capability, it has little, if any, effect on bronchial hyperreactivity, as measured by methacholine challenges. Thus, other forms of long-term therapy should be used in reducing bronchial hyperreactivity." @default.
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- W2016203527 date "1990-04-01" @default.
- W2016203527 modified "2023-09-22" @default.
- W2016203527 title "Relationship of different serum levels of theophylline on methacholine sensitivity" @default.
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- W2016203527 doi "https://doi.org/10.1016/0091-6749(90)90194-9" @default.
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