Definition and Nomenclature of Chronic Obstructive Pulmonary Disease: Time for Its Revision

Celli et al discuss the need to revise the definition and nomenclature of chronic obstructive pulmonary disease. The definition and the diagnostic criteria (terms often mixed or confused) of a disease represent different constructs. A definition must describe its essential attributes while avoiding circularity, it must also not consist of terms that are synonymous with it. It should not be too wide or too narrow (not miss or include anything to which the term should not be applied). It should also be clear, understandable, and positive, attempting to avoid concepts derived by exclusions.