[Validation study of the BDI/TDI scores in chronic obstructive pulmonary disease].

BACKGROUND: The Baseline and Transition Dyspnoea Indices (BDI/TDI) provide measurements of breathlessness and of its impact on activities of daily living. OBJECTIVES: To assess, in France, the measurement characteristics of the BDI/TDI scores. METHOD: A multicentric cohort of 103 patients with mild to severe COPD was questioned by both a medical and a paramedical investigator at enrollment and again 6 months later. RESULTS: Concordance between investigators was good for all the sub-scores of the BDI, but less satisfactory for the TDI score. The BDI score was significantly correlated with all spirometric data. Conversely, the TDI score only correlated significantly with change in the FEV1. Both scores correlated highly with the modified Medical Research Council score, the St George Respiratory Questionnaire and with their evolution. The average TDI score was close to 0 in stable patients indicating good reproducibility of this Index. Changes in the TDI score were closely associated with changes in global health assessment by physicians, less so when assessed by patients. CONCLUSION: The BDI-TDI scores appear to be valid instruments for the measurement of dyspnoea in COPD patients and, less significantly, for measurement of its change over time.