英语语法分析

A NST is performed using an electronic fetal monitor.

无应激试验使用胎儿电子监护。

Results: There were obvious differences in CST and NST monitoring asphyxia neonatorum.

结果：单项CST监测较nst监测新生儿窒息有显著差异。

Objective To detect the value of combination of AFI and NST in prediction the prognosis of perinatal fetus.

目的探讨产前羊水指数（AFI）和无负荷试验（NST）联合测定对预测围产儿预后的价值。