Assessment of dystocia pelvis by ultrasound pelvimetry.

H Nakano
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Abstract

Following successful preceding studies, a quantitative analysis of the female pelvic cavity was made using contact compound scanning procedures. The subjects were seventy-seven, 3 day postpartum women and ultrasonic tomograms were obtained concerning the five pelvic transections in each individual. For the quantitative analysis, variables of binary digits were used. Such were based on the standard of "normopelvis" in the polar coordinate system plus the external criteria, normal progress of labor, protraction and arrest disorders. Characteristics of the dystocia pelvis included an abnormal side wall of the small pelvis as well as an increased resistance of the muscles of the pelvic floor. The efficiency of the discrimination was greatest when those variables were adopted from each transection (78.3%). Arrest disorders could be clearly distinguished from the normal cases, however, cases of protraction disorder presented more difficulty as the distribution was wide between normal and the arrest disorder. Here, the pelvic floor muscles contribute significantly. The newly developed numerical system should make feasible an early prediction of dystocia, assist in screening processes and pave the way for accurate assessments of the interaction of anatomical factors related to the mechanics and processes of labor.

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超声盆腔测量评估难产骨盆。
在之前成功的研究之后,使用接触复合扫描程序对女性盆腔进行了定量分析。研究对象为77名产后3天的妇女,对每名妇女的5例盆腔切断术进行超声断层扫描。为了进行定量分析,我们使用了二进制数作为变量。这是基于极坐标系统的“normopelvis”标准加上外部标准,劳动的正常进展,延长和停止障碍。骨盆难产的特征包括小骨盆侧壁异常以及骨盆底肌肉阻力增加。当从每个横断面中采用这些变量时,识别效率最高(78.3%)。骤停障碍与正常病例可以明显区分,但由于在正常和骤停障碍之间的分布较宽,因此,拖延障碍的病例比较困难。这里,骨盆底肌肉起着重要作用。新开发的数字系统应该可以早期预测难产,协助筛选过程,并为准确评估与劳动力学和过程相关的解剖因素的相互作用铺平道路。
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