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Spirometric changes during exacerbations of COPD: a post hoc analysis of the WISDOM trial.

Abstract：

BACKGROUND:Exacerbations of chronic obstructive pulmonary disease (COPD) are associated with loss of lung function and poor outcomes for patients. However, there are limited data on the time course of changes in forced expiratory volume in 1 s (FEV1) preceding the first reported symptom and after the start of an exacerbation. METHODS:WISDOM was a multinational, randomized, double-blind, active-controlled, 52-week study in patients with severe-to-very severe COPD. Patients received triple therapy (long-acting muscarinic antagonist and long-acting β2-agonist/inhaled corticosteroid [ICS]) for 6 weeks, and were randomized to continue triple therapy or stepwise withdrawal of the ICS (dual bronchodilator group). After suitable training, patients performed daily spirometry at home using a portable, battery-operated spirometer. In the present post hoc analysis, patients who continued to perform daily home spirometry and completed at least one measurement per week for a 56-day period before and after the start of a moderate or severe exacerbation were included. Missing values were imputed by linear interpolation (intermittent), backfilling (beginning) or carry forward (end). Exacerbation onset was the first day of a reported symptom of exacerbation. RESULTS:Eight hundred and eighty-eight patients in the WISDOM study had a moderate/severe exacerbation after the complete ICS withdrawal visit; 360 of them contributed at least one FEV1 measure per week for the 8 weeks before and after the event and are included in this analysis. Mean daily FEV1 began to decline from approximately 2 weeks before the onset of symptoms of an exacerbation, dropping from 0.907 L (mean Days - 56 to - 36 before the exacerbation) to 0.860 L on the first day of the exacerbation. After the exacerbation, mean FEV1 improved but did not return to pre-exacerbation levels (mean Days 36-56 after the exacerbation, 0.875 L). The pattern of FEV1 changes around exacerbations was similar in the triple therapy and dual bronchodilator groups, and a similar pattern was seen in moderate and severe exacerbations when analysed separately. CONCLUSIONS:Mean lung function starts to decline prior to the first reported symptoms of an exacerbation, and does not recover to pre-exacerbation levels 8 weeks after the event. TRIAL REGISTRATION:WISDOM (ClinicalTrials.gov number, NCT00975195 ).

journal_name

Respir Res

journal_title

Respiratory research

authors

Watz H,Tetzlaff K,Magnussen H,Mueller A,Rodriguez-Roisin R,Wouters EFM,Vogelmeier C,Calverley PMA

doi

10.1186/s12931-018-0944-3

subject

Has Abstract

pub_date

2018-12-13 00:00:00

pages

251

issue

eissn

1465-9921

issn

1465-993X

pii

10.1186/s12931-018-0944-3

journal_volume

pub_type

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Spirometric changes during exacerbations of COPD: a post hoc analysis of the WISDOM trial.