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Brita Stenius-Aarniala a Division of Pulmonary Medicine and
Allergology, Helsinki University Central Hospital, FIN-00029 HYKS,
Helsinki, Finland, b STAT-Consulting, Takojankatu 15 B, FIN-33540 Tampere,
Finland, c Peijas Hospital, Sairaalakatu 1, FIN-01400 Vantaa, Finland
Correspondence to: B Stenius-Aarniala,
Department of Medicine, PL 340 Helsinki, University Central Hospital,
FIN-00029 HYKS, Finland bstenius{at}cc.helsinki.fi
Objective:
To investigate the influence of weight
reduction on obese patients with asthma.
Design:
Open study, two randomised parallel groups.
Setting:
Private outpatients centre, Helsinki, Finland.
Participants:
Two groups of 19 obese patients with
asthma (body mass index (kg/m2) 30 to 42)
recruited through newspaper advertisements.
Intervention:
Supervised weight reduction programme
including 8 week very low energy diet.
Main outcome measures:
Body weight, morning peak
expiratory flow (PEF), forced vital capacity (FVC), forced expiratory
volume in one second (FEV1); and also asthma
symptoms, number of acute episodes, courses of oral steroids, health
status (quality of life).
Results:
At the end of the weight reducing programme, the participants in the treatment group had lost a mean of 14.5% of
their pretreatment weight, the controls 0.3%. The corresponding figures after one year were 11.3% and a weight gain of 2.2%. After the 8 week dieting period the difference in changes in percentage of
predicted FEV1 from baseline in the treatment and
control groups was 7.2% (95% confidence interval 1.9% to 12.5%,
P=0.009). The corresponding difference in the changes in FVC was 8.6%
(4.8% to 12.5%, P<0.0001). After one year the differences in the
changes in the two groups were still significant: 7.6% for
FEV1 (1.5% to 13.8%, P=0.02) and 7.6% for FVC
(3.5% to 11.8%, P=0.001). By the end of the weight reduction
programme, reduction in dyspnoea was 13 mm (on a visual analogue scale
0 mm to 100 mm) in the treatment group and 1 mm in the control group
(P=0.02). The reduction of rescue medication was 1.2 and 0.1 doses
respectively (P=0.03). After one year the differences in the changes
between the two groups were
12 for symptom scores (range
1 to
22, P=0.04) and
10 for total scores (
18 to
1, P=0.02). The
median number of exacerbations in the treatment group was 1 (0-4) and
in the controls 4 (0-7), P=0.001.
Conclusion:
Weight reduction in obese patients with
asthma improves lung function, symptoms, morbidity, and health status.
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