Chest
Volume 100, Issue 3, September 1991, Pages 670-674
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Clinical Investigations
Action of Budesonide on Asthmatic Bronchial Hyperresponsiveness: Effects on Directly and Indirectly Acting Bronchoconstrictors

https://doi.org/10.1378/chest.100.3.670Get rights and content

We have investigated the effects of inhaled budesonide on the bronchial responsiveness to both directly and indirectly acting spasmogens in man. Following treatment with budesonide or placebo for three weeks in a double-blind, crossover trial with a three-week washout, the response to histamine and bradykinin was determined in ten patients with mild asthma. After treatment with budesonide, the response to both inhaled histamine and bradykinin was decreased when compared with placebo. The PD35 histamine was increased by 1.95 doubling doses and PD35 bradykinin by 2.1 doubling doses. Daily (PEF) recordings were significantly increased during budesonide therapy, the morning PEF by 34.8 ± 14.1 L/min and evening by 50.3 ± 23.1 L/min. Baseline laboratory lung function on the study days was not altered by budesonide nor were symptom records altered significantly. Inhaled budesonide therefore inhibits to the same extent the exaggerated response to both directly acting histamine and bradykinin which acts through airway nerves.

(Chest 1991; 100:670-74)

Section snippets

Subjects

Ten atopic subjects with mild asthma requiring only irregular therapy with inhaled β2 agonists (Table 1) took part in this study which had the permission of the Royal Postgraduate Medical School and Hammersmith Special Health Authority Ethics Committee.

Challenges

Histamine challenge: Baseline lung function was taken as the mean of six consecutive measurements of (SGaw) measured using a computer-assisted body Plethysmograph.12 The subjects then inhaled five breaths of 0.9 percent saline solution from a

Lung Function

There were no differences between the baseline FEV1 and SGaw on all the study days, the mean ± SE FEV1 being 3.16 ±0.14 L before and 3.14 ±0.24 L after placebo and 3.34 ± 0.14 L before and 3.41 ± 0.15 L after budesonide. The mean ± SE SGaw was 0.77 ± 0.11 kPa–1•s–1 before and 0.76±0.12 kPa–1•s–1 after placebo and 0.91 ± 0.12 kPa–1•s–1 before and 0.87±0.1 kPa–1•s–1 after budesonide (Table 2).

Challenge

Analysis of the four histamine and bradykinin challenges show no difference between the two pre-drug

DISCUSSION

Inhaled budesonide (1.2 mg/24 h) for three weeks reduced the BHR to both the direct stimulus histamine and the indirect stimulus bradykinin to the same degree (1.95 and 2.1 doubling doses, respectively). In this group of patients with mild asthma, budesonide had little effect on symptoms or clinic lung function, although there was a small but significant increase in daily PEF.

The magnitude of decrease in BHR to histamine is consistent with that previously reported.2, 3, 4, 5, 6 We are unaware

ACKNOWLEDGMENTS

The writers thank the Medical Research Council and the Chest, Heart and Stroke Association for their support of this work.

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    Manuscript received November 5; revision accepted January 22.

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