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Stephen Shrewsbury a GlaxoWellcome UK, Stockley Park West, Uxbridge,
Middlesex UB11 1BT, b St Peter's Hospital, Chertsey, Surrey
KT16 0PZ
Correspondence to: S Shrewsbury
sbs40926{at}glaxowellcome.com
Objective:
To examine the benefits of adding
salmeterol compared with increasing dose of inhaled corticosteroids.
Design:
Systematic review of randomised, double blind clinical trials. Independent data extraction and validation with summary data from study reports and manuscripts. Fixed and random effects analyses.
Setting:
EMBASE, Medline, and GlaxoWellcome internal clinical study registers.
Main outcome measures:
Efficacy and exacerbations.
Results:
Among 2055 trials of treatment with
salmeterol, there were nine parallel group trials of
12 weeks with
3685 symptomatic patients aged
12 years taking inhaled steroid in
primary or secondary care. Compared with response to increased
steroids, in patients receiving salmeterol morning peak expiratory flow
was greater at three months (difference 22.4 (95% confidence interval
15.0 to 30.0) litre/min, P<0.001) and six months (27.7 (19.0 to 36.4) litre/min, P<0.001). Forced expiratory volume in one second
(FEV1) was also increased at three months (0.10 (0.04 to 0.16) litres, P<0.001) and six months (0.08 (0.02 to 0.14)
litres, P<0.01), as were mean percentage of days and nights without
symptoms (three months: days
12% (9% to 15%), nights
5% (3% to
7%); six months: days
15% (12% to 18%), nights
5% (3% to 7%);
all P<0.001) and mean percentage of days and nights without need for
rescue treatment (three months: days
17% (14% to 20%), nights
9%
(7% to 11%); six months: days
20% (17 to 23%), nights
8% (6% to
11%); all P<0.001). Fewer patients experienced any exacerbation with
salmeterol (difference 2.73% (0.43% to 5.04%), P=0.02), and the
proportion of patients with moderate or severe exacerbations was also
lower (2.42% (0.24% to 4.60%), P=0.03).
Conclusions:
Addition of salmeterol in symptomatic
patients aged 12 and over on low to moderate doses of inhaled steroid
gives improved lung function and increased number of days and nights without symptoms or need for rescue treatment with no increase in
exacerbations of any severity.
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