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Prevalence of COPD in 6 Urban Clusters in Argentina: The EPOC.AR Study.

Prevalence of COPD in 6 Urban Clusters in Argentina: The EPOC.AR Study.
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Echazarreta AL, Arias SJ, Del Olmo R, Giugno ER, Colodenco FD, Arce SC, Bossio JC, Armando G, Soriano JB, ,


Echazarreta AL, Arias SJ, Del Olmo R, Giugno ER, Colodenco FD, Arce SC, Bossio JC, Armando G, Soriano JB, , (click to view)

Echazarreta AL, Arias SJ, Del Olmo R, Giugno ER, Colodenco FD, Arce SC, Bossio JC, Armando G, Soriano JB, ,

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Archivos de bronconeumologia 2017 12 05() pii S0300-2896(17)30406-4
Abstract
INTRODUCTION
The prevalence of chronic obstructive pulmonary disease (COPD) has not been studied in Argentina.

OBJECTIVES
To determine the prevalence and relevant clinical characteristics of COPD in a representative sample.

MATERIAL AND METHODS
We performed a cross-sectional study in a population of adults aged ≥ 40 years randomly selected by cluster sampling in 6 urban locations. Subjects answered a structured survey and performed pre- and post-bronchodilator spirometry (PBD). COPD was defined as FEV1/FVC ratio < 0.7 predicted value. The total prevalence was estimated for each cluster with its 95% confidence interval (CI). RESULTS
Of 4,599 surveys and 3,999 spirometries, 3,469 were considered of adequate quality (86.8%) for our study. The prevalence of COPD was 14.5% (CI: 13.4-15.7). The distribution of COPD cases according to FEV1 (GOLD 2017) was stage 1: 38% (CI: 34-43); stage 2: 52% (CI: 47-56); stage 3: 10% (CI: 7-13); and stage 4: 1% (CI: 0-2), and according to the refined ABCD (GOLD 2017) assessment: A: 52% (CI: 47-56); B: 43% (CI: 39-48); C: 1% (CI: 0-2); D: 4% (CI: 2-6). The rate of underdiagnosis was 77.4% (CI 73.7-81.1%) and diagnostic error 60.7% (CI 55.1-66.3%). A significant association was found between COPD and age (OR 3.77 in individuals 50-59 years of age and 19.23 in those > 80 years), male gender (OR 1.62; CI 1.31-2), smoking (OR 1.95; CI 1.49-2.54), low socioeconomic status (OR 1.33; CI 1.02-1.73), and previous tuberculosis (OR 3.3; CI 1.43-7.62).

CONCLUSIONS
We estimate that more than 2.3 million Argentineans have COPD, with high rates of underdiagnosis and diagnostic error.

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