Müller-Tyl E, Lempert J, Steinbereithner K, Benzer H
Am J Obstet Gynecol. 1975 Jun 1;122(3):295-300. doi: 10.1016/0002-9378(75)90171-4.
The surface properties of the amniotic fluid were determined in 96 normal pregnancies between weeks 23 and 41. The y-max, y-min, hysteresis areaa, and stability index were used as parameters for evaluation of the surface tension are diagrams. These results were plotted against the gestation week and a curve for the normal course of surface tension of the amniotic fluid during the second half of gestation was obtained. The influence of addition of blood, vernix, and meconium to amniotic fluid as well as that of changes in the pH and dilution were examined. The results were unaffected by either blood, vernix, or pH changes. The slight scatter of the y-min values makes this parameter particularly suitable for determining fetal lung maturity.
在96例妊娠23至41周的正常孕妇中测定了羊水的表面特性。y最大值、y最小值、滞后面积和稳定性指数用作评估表面张力面积图的参数。将这些结果与孕周作图，得出妊娠后半期羊水表面张力正常变化过程的曲线。研究了向羊水中添加血液、胎脂和胎粪以及pH值变化和稀释的影响。结果不受血液、胎脂或pH值变化的影响。y最小值的轻微离散使得该参数特别适合于确定胎儿肺成熟度。
