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Original Research

Opportunistic screening for COPD in primary care: a pooled analysis of 6,710 symptomatic smokers and ex-smokers

, &
Pages 1633-1638 | Published online: 22 Jul 2019
 

Abstract

Objective

To investigate the prevalence and predictors of COPD in a large cohort of symptomatic smokers and ex-smokers in a primary care setting.

Methods

General practitioners (n=390) consecutively recruited individuals ≥35 years, with current or previous tobacco exposure, at least one respiratory symptom, and no previous diagnosis of obstructive airways disease; and obtained data on tobacco exposure, body mass index (BMI), and dyspnea (Medical Research Council dyspnea scale). All individuals with airflow obstruction, ie, FEV1/FVC <0.70 at initial lung function test, had diagnostic spirometry, including bronchodilator reversibility test. COPD was defined as respiratory symptom(s), tobacco exposure, and nonreversible airflow limitation.

Results

Of the 6,710 at-risk individuals screened with spirometry (52% male sex, mean age 58 years [SD 10.9]), 1,185 were diagnosed with COPD (17.7%). Apart from age and pack-years, multivariate logistics regression analysis, adjusted for FEV1, revealed that BMI <25 kg/m2 (OR 4.2, 95% CI 3.0–5.9, p<0.001), BMI 35+ kg/m2 (OR 1.6, 95% CI 1.2–2.3), self-reported dyspnea (OR 1.2, 95% CI 1.1–14, p=0.04), wheeze (OR 1.3, 95% CI 1.1–1.6, p=0.001), phlegm (OR 1.4, 95% CI 1.1–1.6, p<0.001), and MRC ≥3 (OR 1.6, 95% CI 1.2–2.0, p=0.001) were associated with a significantly higher likelihood of being diagnosed with COPD. No association was found between sex, cough, and recurrent respiratory tract infections and a diagnosis of COPD.

Conclusion

The prevalence of COPD is high among smokers and ex-smokers with one or more respiratory symptoms seen in primary care, and the presence of wheeze, phlegm and dyspnea, together with both low BMI and obesity identify a subgroup with an even higher likelihood of COPD.

Acknowledgments

The preliminary findings of this paper were presented at the annual meeting of the European Respiratory Society, 2018, at a thematic poster session, and the abstract was published in Eur Respir J; 2018;52(suppl 62):PA756.

Disclosure

CSU has received a fee for being a member of the study steering committee. The authors report no other conflicts of interest in regard to this work.