Rapid corticosteroid effect on β2-adrenergic airway and airway vascular reactivity in patients with mild asthma - 15/08/11
, Gabor Horvath, MD, PhD a, b, Michael Campos, MD a, Adam Wanner, MD a
Reprint requests: Eliana S. Mendes, MD, Division of Pulmonary and Critical Care Medicine, University of Miami School of Medicine, PO Box 016960 (R-47), Miami, FL 33101.Abstract |
Background |
Long-term glucocorticoid therapy has been suggested to improve airway and airway vascular smooth muscle responsiveness to inhaled β2-agonists in patients with asthma.
Objective |
We sought to assess whether a single dose of an inhaled glucocorticoid acutely potentiates β2-adrenergic airway and airway vascular smooth muscle reactivity in asthma.
Methods |
In 10 asthmatic and 10 healthy subjects, airway blood flow and FEV1 were measured before and 30 minutes after fluticasone or placebo inhalation and 15 minutes after the subsequent inhalation of racemic albuterol (0.6 mg or 1.25 mg) or (R)-albuterol (0.3 mg or 0.6 mg).
Results |
In healthy subjects all albuterol formulations increased airway blood flow equally after placebo or fluticasone pretreatment. In asthmatic subjects airway blood flow response was blunted after placebo and acutely restored after fluticasone pretreatment. Fluticasone pretreatment did not increase FEV1 responses to any albuterol formulation, except 0.6 mg racemic albuterol.
Conclusion |
A single dose of an inhaled glucocorticoid restores β2-adrenergic airway vasodilator responses in patients with mild asthma. The mechanism of this rapid glucocorticoid effect remains to be clarified.
Le texte complet de cet article est disponible en PDF.Key words : Asthma, airway blood flow, corticosteroids, fluticasone, nongenomic action, β2-agonists, albuterol, levalbuterol
Abbreviation used : Qaw
Plan
| Supported by an academic research grant from Sepracor. G.H. is a recipient of the Bolyai Fellowship of the Hungarian Academy of Sciences. |
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| Disclosure of potential conflict of interest: The authors have declared that they have no conflict of interest. |
Vol 121 - N° 3
P. 700-704 - mars 2008 Retour au numéro
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