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de Marco, R.* ; Accordini, S.* ; Antò, J.M.* ; Gislason, T.* ; Heinrich, J. ; Janson, C.* ; Jarvis, D.* ; Künzli, N.* ; Leynaert, B.* ; Marcon, A.* ; Sunyer, J.* ; Svanes, C.* ; Wjst, M. ; Burney, P.*

Long-term outcomes in mild/moderate chronic obstructive pulmonary disease in the European community respiratory health survey.

Am. J. Respir. Crit. Care Med. 180, 956-963 (2009)

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Open Access Green möglich sobald Postprint bei der ZB eingereicht worden ist.

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Rationale: Little is known about the long-term outcomes of individuals with mild/moderate chronic obstructive pulmonary disease (COPD) according to spirometric criteria. Objectives: To test whether nonsmokers and asymptomatic subjects with a spirometric diagnosis of COPD have a steeper decrease in lung function and higher hospitalization rates than subjects without airway obstruction. Methods: A total of 5,205 subjects without asthma (20-44 years of age) from the general population, with FEV1 >= 50% predicted at baseline, were followed for 9 years in the frame of an international cohort study. Percent decrease in FEV1 (Delta FEV1%) and the annual hospitalization rate for respiratory causes during the follow-up were assessed for each subject. Measurements and Main Results: At baseline, 324 (6.2%) subjects had the prebronchodilator FEV1/FVC ratio less than the lower limit of normal (LLN-COPD), and 105 (2.0%) subjects had the same ratio less than 0.70 (modified GOLD-COPD). At follow-up, smokers with LLN-COPD (n = 205) had a greater mean Delta FEV1% (1.7%; 95% confidence interval [CI], 0.8-2.7) and a higher hospitalization rate (rate ratio [RR], 2.52,95% Cl, 1.65-3.86) than normal subjects. Similarly, symptomatic subjects with LLN-COPD (n = 104) had Delta FEV1% (2.0%; 95% CI, 0.8-3.3) and the hospitalization rate (RR, 4.18; 95% CI, 2.43-7.21) higher than the reference group. By contrast, nonsmokers and asymptomatic subjects with LLN-COPD had outcomes that were similar or even better than normal subjects. Among subjects with LLN-COPD, the association of symptoms with Delta FEV1% varied according to smoking habits (P = 0.007); it was particularly strong in symptomatic smokers and disappeared in symptomatic nonsmokers. Similar results were found with the modified GOLD classification. Conclusions: In relatively young populations, COPD is associated with poor long-term outcomes in smokers and in symptomatic subjects only.

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