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广度超声的近代技术进展,提高了正常及异常解剖关系的分辨力,故有助于检查子宫下段及子宫颈管。在正常妊娠,宫颈保持关闭以保证胎儿成熟。足月孕期末分娩时宫颈变薄及扩张,以娩出胎儿。在妊娠期超声可用以观察宫颈。分娩前宫颈扩张有三种情况:1)未成熟分娩;2)难免性流产;3)宫颈机能不全。超声发现宫颈内管腔扩张可预示为异常妊娠。妊娠早期若发现宫颈内管腔扩张,可用拟β交感神经药以抑制进一步分娩。这类药有副作用,如高血压、心动过速及高血糖。若宫颈腔关闭可考
The breadth of ultrasound in the progress of modern technology, improve the normal and abnormal anatomic resolution, it is helpful to check the lower uterine segment and the cervix. In normal pregnancy, the cervix remains closed to ensure fetal maturity. Full-term pregnancy when the cervix is thinning and expansion during childbirth to deliver the fetus. Ultrasound during pregnancy can be used to observe the cervix. Cervical dilatation before delivery there are three cases: 1) immature delivery; 2) unavoidable abortion; 3) cervical insufficiency. Ultrasound findings of intracavitary lumen expansion can be predicted as abnormal pregnancy. If early pregnancy found cervical lumen dilatation, quasi-β sympathomimetic drugs available to inhibit further labor. Such drugs have side effects such as high blood pressure, tachycardia and high blood sugar. If the cervix can be closed test