Eformoterol n-of-1 trials in chronic obstructive pulmonary disease poorly reversible to salbutamol.

Abstract:

AIMS:Benefits of long acting beta 2 agonists are unclear for severe chronic obstructive pulmonary disease (COPD) patients with poor response to short acting bronchodilators. We aimed to evaluate 1) effects of eformoterol in such patients using a 'n-of-1' double crossover study design, and 2) aggregate data as a double-blind, double crossover randomized control trial. METHODS:Subjects with forced expiratory volume in one second (FEV1) < 60% predicted, and poor response to short acting bronchodilators were studied six times over 18 weeks. During that time they were prescribed four weeks of either eformoterol or placebo, followed by the alternate, and then a second crossover. Four-weekly measures included six minute walk distance (6MWD), FEV1, previous two weeks of symptoms, and chronic respiratory questionnaire (CRQ) including treatment goal items. RESULTS:Of 27 original subjects (21 male, mean age of 70 years, five smokers, mean prebronchodilator FEV1 36% predicted), one subject had clinically significant concordant improvement in the CRQ dyspnoea domain and 6MWD (by 51 metres), but not for other outcomes. There were no concordant improvements in any other subjects. Aggregate double crossover data analysis demonstrated no improvement in any outcome measures. CONCLUSIONS:The 'n-of-1' study design and aggregate data analysis demonstrated lack of benefit from eformoterol in COPD patients with poor response to short acting bronchodilators.

journal_name

Chron Respir Dis

authors

Smith BJ,Appleton SL,Veale AJ,McElroy HJ,Veljkovic D,Saccoia L

doi

10.1191/1479972304cd028oa

keywords:

subject

Has Abstract

pub_date

2004-01-01 00:00:00

pages

63-9

issue

2

eissn

1479-9723

issn

1479-9731

journal_volume

1

pub_type

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