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是什么原因阻碍了胎儿的自动回转而发生臀位,我们设想:胎盘在子宫腔不同部位附着,使宫腔形态发生改变,胎儿自动回转受到阻碍可能是臀位发生的一个重要原因。因此我们对这个问题采用本院病例进行回顾性探讨。资料分析一、资料来源:回顾抽查了本院自1984年3月～1988年3月初产妇单胎,孕周>37周,无骨盆异常、胎儿畸形及子宫异常,新生儿体重>2500克,无脐带异常的臀位200例,分娩方式均为剖宫产,正常初产头位,足月阴道顺产200例。该400例均在产前一周以内接受过“B”超胎盘定位诊断,对两组病历根据“B”超胎盘定位在宫腔不同部位附着进行了对照分析。二、胎盘在宫腔内附着部位的分类:(一)子宫前壁附着胎盘:胎盘最厚部分的中心位于子宫前壁中央部或稍偏左右侧壁,但胎盘组织大部分位于前壁。(二)子宫后壁附着胎盘:胎盘最厚部分的中心位于子宫后壁中央部或稍偏左右侧壁,但胎盘大部位于后壁。
What causes obstruction of the fetus’s auto-turn occurs breech, we assume that: the placenta attached to different parts of the uterine cavity, the uterine cavity morphology changes, obstruction of fetal autorotation may be an important reason for the occurrence of breech. Therefore, we retrospectively analyzed the case of our hospital on this issue. Data Analysis I. Source: Review of randomized hospital from March 1984 to March 1988 early maternal singleton, gestational age> 37 weeks, no pelvic abnormalities, fetal malformations and uterine anomalies, neonatal body weight> 2500 grams, no Abnormal umbilical cord breech 200 cases, cesarean delivery methods are normal, normal first born head, full-term vaginal delivery in 200 cases. All 400 cases were diagnosed as “B” hyperplasia within one week before delivery. The two groups of medical records were analyzed according to “B” hyperplasia localization in different parts of the uterine cavity. Second, the placenta attached to the uterine cavity in the classification: (a) the anterior wall of the uterus placenta attached placenta: the thickest part of the center of the anterior wall of the uterus is located in the center or slightly lateral wall, but most of the placenta is located in the anterior wall. (B) the posterior wall of the uterus attached to the placenta: the thickest part of the center of the placenta is located in the center of the posterior wall of the uterus or slightly lateral wall, but most of the placenta in the posterior wall.