选取同期正常晚期妊娠妇女39例为对照组。

And 39 healthy pregnant women were taken as control group.

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中期妊娠妇女较早孕妊娠妇女明显升高（P<0.01），晚期妊娠妇女有所下降；

The serum nitric oxide level in mid-trimester was significantly higher than that in early pregnancy(P<0.01), and decreased in late trimester serum.

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方法应用放射免疫分析法对58例PIH患者、50例晚期妊娠妇女和52例对照组血浆et、CGRP含量进行测定。

Methods: Plasma levels of et, CGRP were measured by radioimmunoassay in 58 patients with PIH (PIH group), 50 normal late-stage pregnant women (pregnant group) and 52 healthy women (control group).

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