Huang G, Du J, Luo Y
Hua Xi Yi Ke Da Xue Xue Bao. 1990 Jun;21(2):166-70.
The mean transit time(MTT) and partial mean transit time(MTTp) were measured and analysed by "direct method" in 628 cases of normal adolescents in Cheng-du. The results showed that both MTT and MTTp were increased with age and prolonged with the decay of lung volume. Besides, the FVC-t curve was not single exponential in nature. The specific mean transit time (SMTT) was introduced by correcting MTT with 0.5 FVC and represented the MTT when unit volume of gas passed through just at that lung volume. SMTT was highly negatively correlated with age. This reflected the development and growth of the lung recoil and airway conductance in adolescents.
采用“直接法”对628例成都正常青少年的平均通过时间（MTT）和部分平均通过时间（MTTp）进行了测量和分析。结果显示，MTT和MTTp均随年龄增长而增加，并随肺容积的减小而延长。此外，FVC-t曲线本质上不是单指数曲线。通过用0.5FVC校正MTT引入了比平均通过时间（SMTT），它表示单位体积气体在该肺容积时通过的MTT。SMTT与年龄呈高度负相关。这反映了青少年肺弹性回缩和气道传导性的发育和生长情况。
