B型超声观察孕期宫颈机能生理性变化

为探讨妊娠期宫颈机能的生理性变化，以为宫颈机能不全建立一个诊断指标，作者采用腹部Ｂ型超声加阴道水囊的方法，分别于妊娠１２、２０和３０周对１６０例孕妇宫颈长度、宽度和内径进行测量，结果：随着孕周的增加宫颈长度变短，宽度变宽，但内径无显著变化。

Observation on physiologic cervical changes during pregnancy by B-ultrasonography

To investigate physiologic cervical changes during pregnancy in order to offer one of diagnostic indexes for cervical incompetence. By means of abdominal B-ultrasonography,contracting with vaginal water bag,the parameters of a cervix,including length and width of seperately at 12 weeks, 20 weeks and 30 weeks of gestation in 160 cases of pregnant women. The length and the width of cervix were found to be shortened and widened seperately as gestation ad-vanced. But no significant changes were found in the inner diameter of cervical cannal. Meanwhile,the increase in number of abortion also had asignificant effect on the parameters of cervix. According to our data,the normal values of cervical parameters at 12 weeks of gestation were: cervical length>2. 5cm, (x - 2s),cervical width<3.2cm(x+2s)and inner di-ameter of cervical cannal<0. 5cm(x+2s). The diagnosis of cervical imcompetence would be considered if any abnormal changes in the parameters of cervix were found.