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作者按Jordanoglou关于FVC-t曲线上每10％FVC段可考虑为线性的原则,推导出计算部分平均通过时间(MTT_p)的简易公式为: MTT_p=0.1FVC/2V_p 计算高、中、低肺容积处MTT_p的公式为: MTT20～30％=0.1FVC/2V_(75) MTT45～55％=0.1FVC/2?_(50) MTT70～80％=0.1FVC/2?_(25)
According to Jordanoglou’s principle that every 10% FVC segment on the FVC-t curve can be considered as linear, a simple formula for calculating the mean transit time (MTT_p) is derived as: MTT_p = 0.1FVC / 2V_p Calculate the high, middle and low lung volumes MTT_p at the Department of the formula: MTT20 ~ 30% = 0.1FVC / 2V_ (75) MTT45 ~ 55% = 0.1FVC / 2? _ (50) MTT70 ~ 80% = 0.1FVC / 2?