The proportion of non-symptomatic COPD is small
A. C. Jonsson, A. Lindberg, S. A. Jansson, M. Lindström, S. Andersson, L. G. Larsson, E. Rönmark, B. Lundbäck (Luleå, Stockholm, Sweden)
Source: Annual Congress 2002 - Prevalence and costs of COPD
Session: Prevalence and costs of COPD
Session type: Thematic Poster Session
Number: 824
Disease area: Airway diseases
Abstract Background: The prevalence of COPD seems to be considerably higher than has been reported in literature. It is assumed that a large proportion of subjects with COPD is asymptomatic. Aim: How large proportion of subjects fulfilling recent criteria for COPD is symptomatic? Methods: In 1996, 5892 of the Obstructive Lung Disease in Northern Sweden (OLIN) Study¢s first cohort could be traced to a third survey, and 5189 (88%) completed responses were received corresponding to 79% of the original cohort from 1985/86. Of the responders, a random sample of 1500 subjects were invited to interview and lung function test, and 1237 of the invited completed a lung function test with acceptable quality. Results: In ages > 45 y, the prevalence of COPD according to the BTS guidelines was 8%, while it was 17% according to GOLD. The dominating risk factors were increasing age and smoking, and approximately a half of smokers > 70 y had COPD. Of those fulfilling the BTS criteria for COPD, 94% were symptomatics, 69% had chronic productive cough, but only 31% had prior to the study been diagnosed as either having chronic bronchitis, emphysema, or COPD. The corresponding figures for COPD according to GOLD were 88, 51, and 18%. Among subjects with mild COPD according to GOLD, i.e. FEV1 >= 80% of predicted, 70% had symptoms. Of those with FEV1 < 40 % of predicted, only 50% had a diagnosis of chronic bronchitis, emphysema, or COPD. Conclusion: The large majority of subjects having COPD are symptomatic, while the proportion of those diagnosed as having COPD, emphysema, or chronic bronchitis was small.
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A. C. Jonsson, A. Lindberg, S. A. Jansson, M. Lindström, S. Andersson, L. G. Larsson, E. Rönmark, B. Lundbäck (Luleå, Stockholm, Sweden). The proportion of non-symptomatic COPD is small. Eur Respir J 2002; 20: Suppl. 38, 824
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