Objective To explore the advantage of dyspnea differentiation index (DDI) for evaluation of chronic obstructive pulmonary disease (COPD).

• 目的 探讨气急鉴别指数 (dyspnea differentiation index,DDI)在慢性阻塞性肺病 (chronicobstructive pulm onary disease,COPD)病情评估中的初步应用。