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如何管理臀位孕妇及应否施外倒转术至今仍有争论。自然回转为头位的可能性以及何时应施行外倒转术尚未系统研究。本文拟研究妊娠末三月臀位自发回转为头位的总数,发生时间并评价有关因素。收集1982年7月至1983年10月孕32周以后妊娠经超声检查4,690例中有310例(6.7%)为单胎臀位,以后每周触诊复查胎位不明确时再次超声检查,直至分娩。孕妇分成两组:持续性臀位(PB)组133例(43%),自发回转为头位(SCV)组177例(57%)。孕32周超声检查显示两组胎双顶径、腹径、股骨长径、胎儿大小及胎盘位置均无差别;两组胎姿态不同。屈膝者 SCV 组(52%)比 PB 组(20%)多(P<0.001)。PB 组80%胎儿为伸腿。PB 组比 SCV 组更早发生早产(P<0.001)。PB 组胎儿体重,身长和脐带长度值均较小。如按分娩时
How to manage the breech pregnant women and should be out of body inversion surgery is still controversial. The possibility of a natural turn to the head and the timing of an external inversion have not been systematically studied. This article intends to study the end of March pregnancy breech spontaneous turn for the first time the total number of places, time and evaluate the relevant factors. 310 cases (6.7%) of the 4,690 pregnancies were examined by ultrasound during the 32 weeks of pregnancy from July 1982 to October 1983 after pregnancy, and single fetus breechination was performed after the weekly palpation examination. The fetal position was ambiguously examined again until the childbirth . Pregnant women were divided into two groups: 133 (43%) in the persistent breech (PB) group and 177 (57%) spontaneously in the SCV group. Thirty-two weeks pregnant ultrasound examination showed that there was no difference between the two groups of fetal biparietal diameter, abdominal diameter, femur length, fetal size and placenta position; In knees SCV group (52%) was more than PB group (20%) (P <0.001). PB group 80% of the fetus for stretching. Premature labor occurred in PB group earlier than in SCV group (P <0.001). PB group fetus weight, length and umbilical cord length values are small. Such as by childbirth