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通过测定１４例未孕妇及２５例正常晚孕妇母血及脐血一氧化氮（ＮＯ）的含量及部分病例子宫动脉及脐动脉最大收缩期与舒张末期血流速度之比（Ｓ／Ｄ），研究正常妊娠时母体及胎儿循环ＮＯ的变化。结果脐血ＮＯ含量显著高于母血（Ｐ＜０．０１），且与脐动脉Ｓ／Ｄ值呈现显著负相关（ｒ＝－０．５２，Ｐ＜０．０５）。说明ＮＯ对正常妊娠母体及胎儿循环均有重要调节作用
The levels of serum and umbilical blood nitric oxide (NO) in 14 pregnant women and 25 normal pregnant women were measured, and the ratio of the maximal systolic to diastolic blood flow velocity (S / D) of uterine artery and umbilical artery in some cases were determined. To study the change of NO in maternal and fetus during normal pregnancy. Results The content of umbilical cord blood NO was significantly higher than that of maternal blood (P <0.01), and had a significant negative correlation with the S / D of umbilical artery (r = -0.52, P <0.05). Description of NO on the normal pregnancy and fetal maternal cycle have an important regulatory role