Fagan D G
Thorax. 1977 Apr;32(2):198-202. doi: 10.1136/thx.32.2.198.
Sixty-eight sets of deflation data from the left lungs of children who had died from non-pulmonary causes were analysed by the exponential equation model to derive theoretical values of Pst(1) for 50, 60, and 90% of the observed maximum inflation volume. The resultant P50, 60, and 90 values were compared to the same values measured from graphic displays of the V-P data. The graphically derived Pst(1) data at 50, 60, and 90% of TLC were then plotted against the crown-heel length to demonstrate a shape change related to physical growth. It was found that the form of the deflation curve in preterm infants did not fit an exponential model as satisfactorily as did the deflation curve from older children. The exponential model should be used with caution in small infants where Pst(1) values below P90 are sought. A maximum inflation pressure of +30 cm H2O was found to produce a Vmax within 98% of the hypothetical VINF value.
对68组因非肺部原因死亡儿童左肺的放气数据进行指数方程模型分析，以得出观察到的最大充气量的50%、60%和90%时的理论Pst(1)值。将所得的P50、P60和P90值与从V-P数据图形显示中测得的相同值进行比较。然后将在TLC的50%、60%和90%时通过图形得出的Pst(1)数据与顶臀长度作图，以显示与身体生长相关的形态变化。结果发现，早产儿的放气曲线形式不如大龄儿童的放气曲线那样能很好地拟合指数模型。在寻求Pst(1)值低于P90的小婴儿中，应谨慎使用指数模型。发现+30 cm H2O的最大充气压力可使Vmax在假设的VINF值的98%以内。
