Transition Dyspnea Index Clinical Classification

**Semantic type:** Intellectual Product

**Definition:** A standardized rating scale developed by Mahler et al in 1984, which is a general scale used to measure the changes in dyspnea severity from the baseline as established by the Baseline Dyspnea Index (BDI). The questionnaire contains 3 categories of 24 items change in functional impairment, change in magnitude of task, change in magnitude of effort. The instrument is scored on a seven-grade scale for each category, where grade -3 represents major deterioration and grade +3 represents major improvement.

**Synonyms:** - TDI - TDI - TDI01