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测定１４例不同原因所致的弥漫性间质性肺疾病病人支气管肺泡灌洗液（ＢＡＬＦ）中细胞数、血管紧张素转换酶（ＡＣＥ）活性。与对照组比较，细胞数、ＡＣＥ活性均升高；病情稳定后，其细胞数、ＡＣＥ活性均较活动期下降。
The number of cells and the activity of angiotensin converting enzyme (ACE) in bronchoalveolar lavage fluid (BALF) were measured in 14 patients with diffuse interstitial lung disease. Compared with the control group, the number of cells and the activity of ACE increased; when the condition was stable, the number of cells and the activity of ACE decreased compared with the activity.