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High resolution CT and bronchial reversibility test for diagnosing COPD.
Kazuyoshi Kurashima1, Noboru Takayanagi, Nagato Sato
1Department of Respiratory Medicine, Saitama, Cardiovascular and Respiratory Center, Konan-cho, Saitama, Japan. a1091749@pref.saitama.jp
Respirology (Carlton, Vic.)
|June 16, 2005
Summary
High-resolution CT (HRCT) and bronchodilator reversibility tests show reasonable sensitivity but low specificity for diagnosing chronic obstructive pulmonary disease (COPD). HRCT aids in identifying COPD heterogeneity and co-existing lung conditions.
Area of Science:
- Pulmonology
- Radiology
- Diagnostic Medicine
Background:
- Chronic obstructive pulmonary disease (COPD) is characterized by irreversible airflow limitation linked to risk factors.
- Accurate COPD diagnosis necessitates excluding other causes of chronic airflow limitation (CAL).
- Assessing the diagnostic utility of high-resolution thoracic CT (HRCT) and bronchodilator reversibility is crucial.
Purpose of the Study:
- To evaluate the diagnostic performance of HRCT and bronchodilator reversibility testing in COPD diagnosis.
- To determine the sensitivity and specificity of these methods for identifying COPD.
- To explore HRCT's role in characterizing COPD heterogeneity and detecting co-existing pulmonary conditions.
Main Methods:
- Investigated 516 patients with FEV1/FVC < 70% post-bronchodilator.
- Performed HRCT on all subjects.
- Final diagnosis confirmed after 3 months of treatment and repeated spirometry.
Main Results:
- COPD diagnosed in 54.3% of patients; other CAL in 12.7%.
- HRCT identified emphysema in 81% and absence of bronchodilator response in 90% of COPD cases (sensitivities).
- Specificities were 57% for HRCT emphysema and 37% for no bronchodilator response; HRCT revealed COPD heterogeneity and complications in 18.6% and 17.5% of patients, respectively.
Conclusions:
- HRCT and bronchodilator reversibility tests offer moderate sensitivity but limited specificity for COPD diagnosis.
- HRCT is valuable for detecting COPD heterogeneity and concurrent lung diseases.
- These tools assist in differentiating COPD from other CAL causes, though HRCT is essential for rarer conditions.