Abstract:
INTRODUCTION:The duration of bronchodilator action of the long-acting beta agonist salmeterol when administered in the evening has not been investigated. In this study we have investigated whether a single evening dose of salmeterol, administered from the combination salmeterol/fluticasone (SFC) Accuhaler significantly attenuates the circadian rhythm in airway tone over 24 h. METHODS:Eighteen subjects with mild to moderate asthma (mean FEV1 84% predicted) participated in a double-blind, double dummy, placebo controlled, cross-over study. Subjects inhaled, in random order, placebo, salbutamol (200 microg) or SFC (50/100 microg) administered in the evening (2000 h) on three separate occasions. Lung function measurements including FEV1, specific airways conductance (sGaw) and maximum expiratory flow at 25-75% of vital capacity (MEF(25-75%)) were assessed at baseline, at 1 h and subsequently every 4 h post-dose for 24 h. RESULTS:Compared with placebo, SFC significantly improved the three measures of airways function throughout the 24 h period, with a difference in FEV1 at 24 h of 0.24 l (0.00-0.47 l). SFC abolished the biphasic pattern of the circadian rhythm in airway tone. In contrast, salbutamol had a significant bronchodilator action of 4-8 h, depending on the lung function parameter measured. CONCLUSION:The single evening administration of SFC via the Accuhaler resulted in a duration of bronchodilation of at least 24 h, with the abolition of the accentuated biphasic circadian variation in airway tone observed in asthma.
journal_name
Respir Medjournal_title
Respiratory medicineauthors
Masoli M,Weatherall M,Ayling J,Williams M,Beasley Rdoi
10.1016/j.rmed.2004.10.001subject
Has Abstractpub_date
2005-05-01 00:00:00pages
545-52issue
5eissn
0954-6111issn
1532-3064pii
S0954-6111(04)00384-1journal_volume
99pub_type
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