[From COPD definitions to COPD phenotypes].

Abstract excerpt

COPD is characterized by incompletely reversible airflow limitation (FEV1/FVC < 70%). The historical classification of COPD, which was based on the severity of airflow limitation assessed by the level of FEV1, did not take into account the various aspects of COPD patients. At comparable levels of FEV1, COPD patients show marked heterogeneity in clinical manifestations (dyspnea, rates of exacerbations, exercise...

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