Abstract | BACKGROUND: Ultra-long-acting β2 agonists (uLABA) are relatively new anti- asthma medications of which there are three different formulations currently available: olodaterol, indacaterol, and vilanterol. The first 2 formulations have been shown to exert bronchoprotective effects; they are able to prevent airway smooth muscle contraction on exposure to constricting stimuli. However, studies have found that these 2 drugs produce different degrees and durations of bronchoprotection against methacholine. OBJECTIVE: The objective of this study was to investigate the degree of bronchoprotection provided by vilanterol against methacholine-induced bronchoconstriction. METHODS: Fourteen patients with mild-to-moderate asthma (8 male; baseline percent predicted forced expiratory volume in 1 second [FEV1] > 65%; provocative concentration of methacholine causing a 20% reduction in FEV1 [PC20] ≤ 8 mg/mL) completed this randomized, double-blind, 3-way crossover study. Methacholine challenges were performed before treatment administration (placebo, 100 μg fluticasone furoate, or 25 μg vilanterol + 100 μg fluticasone furoate) and at 0.5 and 24 hours posttreatment. Each treatment arm was separated by a minimum 7-day washout period. A combination therapy of vilanterol+fluticasone furoate was used, because vilanterol is not available as a monotherapy. RESULTS: Significant bronchoprotection was evident after the combination treatment at both 0.5 and 24 hours with doubling dose shifts in methacholine PC20 of 2.0 (P = .0004) and 1.6 (P = .0001), respectively. Clinically significant bronchodilation was only recorded at 24 hours after combination treatment (P < .05). CONCLUSION: CLINICAL TRIAL REGISTRATION: clinicaltrials.gov (NCT03315000).
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Authors | Grace L M Westbury, Christianne M Blais, Beth E Davis, Donald W Cockcroft |
Journal | Annals of allergy, asthma & immunology : official publication of the American College of Allergy, Asthma, & Immunology
(Ann Allergy Asthma Immunol)
Vol. 121
Issue 3
Pg. 328-332
(09 2018)
ISSN: 1534-4436 [Electronic] United States |
PMID | 30017826
(Publication Type: Journal Article, Randomized Controlled Trial)
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Copyright | Copyright © 2018 Elsevier Ltd. All rights reserved. |
Chemical References |
- Adrenergic beta-2 Receptor Agonists
- Androstadienes
- Benzyl Alcohols
- Bronchodilator Agents
- Chlorobenzenes
- vilanterol
- Methacholine Chloride
- fluticasone furoate
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Topics |
- Adrenergic beta-2 Receptor Agonists
(therapeutic use)
- Androstadienes
(therapeutic use)
- Asthma
(drug therapy)
- Benzyl Alcohols
(therapeutic use)
- Bronchoconstriction
(drug effects)
- Bronchodilator Agents
(therapeutic use)
- Chlorobenzenes
(therapeutic use)
- Cross-Over Studies
- Female
- Forced Expiratory Volume
(drug effects)
- Humans
- Male
- Methacholine Chloride
(toxicity)
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