Purpose: Pulmonary tuberculosis (TB) is a well-known risk factor for airflow obstruction and chronic obstructive pulmonary disease (COPD). The prognosis of TB without sequelae on chest X-ray (CXR) remains uncertain.
Methods: We used the 2008-2009 Korea National Health and Nutrition Examination Survey (KNHANES) data and 2007-2012 KNHANES-matched Health Insurance Review and Assessment Service cohort data. Airflow obstruction was assessed using a pulmonary function test. COPD was defined using diagnostic codes and the use of COPD medication for 3-year. We classified subjects into three groups based on TB history and sequelae on CXR.
Results: In 4911 subjects, the CXR(-) (no TB sequelae on CXR) post-TB group ( = 134) showed similar characteristics and normal lung function compared to that of the control group ( = 4,405), while the CXR(+) (TB sequelae on CXR) post-TB group ( = 372) showed different characteristics and reduced lung function. The prevalence of airflow obstruction was 9.3%, 13.4%, and 26.6% in control, CXR(-) post-TB, and CXR(+) post-TB groups, respectively. COPD was more common in the post-TB with CXR(+) (6.5%) or without CXR (-) (4.5%) groups, than in the control group (1.8%). Compared to the CXR(-) post-TB group, the control group showed a lower risk for airflow obstruction (OR, 0.774; = .008). The CXR(+) post-TB group showed a higher risk for airflow obstruction (OR, 1.456; = .011). The Control group also showed a lower risk for the development of COPD than the CXR(-) post-TB group (OR, 0.496; = .011).
Conclusions: We need to educate TB patients that airway obstruction and COPD can easily develop, even if TB sequelae are not observed on CXR.
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