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MediumRespiratoryAsthma-COPD overlapau-amcau-racgpau-racp

A 61-year-old man with a long history of smoking presents with chronic productive cough and progressive dyspnoea. Spirometry shows FEV1/FVC ratio 0.55 and FEV1 55% predicted with significant bronchodilator reversibility. What is the most appropriate diagnosis?

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