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宫颈松弛、孕中期自然流产史和多胎妊娠是中、晚期妊娠流产或早产的重要原因。但在许多妇女宫颈松弛诊断并不明确。对可能有宫颈松弛,但尚未确诊者及被认为存在早产高危者,可在妊娠中期(16～26周)每周或每2周进行宫颈指检。指检之前行阴道超声检查宫颈长度。一般认为,妊娠的前半期超声检查发现突向宫颈管上部的漏斗状胎膜和宫颈变短提示宫颈机能不全。为明确阴道超声在早产高危诊断中的作用进行此项研究。选择23例妊娠16～26周,可能
Cervical relaxation, the second trimester of spontaneous abortion and multiple pregnancy is an important reason for miscarriage or premature birth in the middle and late pregnancy. However, the diagnosis of cervical relaxation in many women is not clear. For those who may have cervical relaxation, but not yet diagnosed and those who are considered to be pre-existing high risk of pregnancy in the second trimester (16 to 26 weeks) weekly or bi-weekly cervical smear. Finger examination before vaginal ultrasound cervical length. Is generally believed that the first half of pregnancy ultrasound examination revealed that the funnel-shaped fetal membranes and the cervix to the upper part of the cervix to shorten the tips of cervical incompetence. This study was conducted to clarify the role of vaginal ultrasound in the high-risk diagnosis of preterm birth. Select 23 cases of pregnancy 16 to 26 weeks, may