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Effects of clonidine on bronchial responses to histamine in normal and asthmatic subjects

AT Dinh Xuan, J Regnard, R Matran, P Mantrand, C Advenier, A Lockhart
European Respiratory Journal 1988 1: 345-350; DOI:
AT Dinh Xuan
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J Regnard
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R Matran
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P Mantrand
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C Advenier
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A Lockhart
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Abstract

Our aim was to examine the effects of clonidine (C), an agonist of central and peripheral alpha-2 adrenoceptors, on bronchomotor responsiveness to histamine (H). In a double-blind study, we compared on two different days the effects of pretreatment with placebo (P) and with 200 micrograms or 150 micrograms of C given orally, in ten normal (NS) and eight asymptomatic asthmatic subjects (AS) respectively, the response to inhalation of serially increasing doses of H. On each day, five doubling doses of H (first dose = 3.5 and 1.1 mumol in NS and AS, respectively) were administered every 5 min; forced expiratory volume in one second (FEV1) was measured after each dose. The dose-response curves were compared by an analysis of variance. Clonidine caused hypotension with bradycardia in all subjects. Baseline values and pre-challenge values of FEV1 after P and C were identical on the two study days. Compared to P, C did not modify the response to H in NS but significantly increased it in AS (p less than 0.01). Our results suggest that the neural control of the airways differs in AS compared to NS and could be explained either by a decrease in sympathetic inhibitory activity or a greater responsiveness of the airways to parasympathetic stimulation and/or a higher parasympathetic tone in AS.

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Effects of clonidine on bronchial responses to histamine in normal and asthmatic subjects
AT Dinh Xuan, J Regnard, R Matran, P Mantrand, C Advenier, A Lockhart
European Respiratory Journal Apr 1988, 1 (4) 345-350;

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Effects of clonidine on bronchial responses to histamine in normal and asthmatic subjects
AT Dinh Xuan, J Regnard, R Matran, P Mantrand, C Advenier, A Lockhart
European Respiratory Journal Apr 1988, 1 (4) 345-350;
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