Morgan M A, Thurnau G R, Fishburne J I
Am J Obstet Gynecol. 1986 Sep;155(3):608-13. doi: 10.1016/0002-9378(86)90288-7.
The objective of this study was to develop a standardized method of identifying fetal-pelvic disproportion by comparing fetal head and abdomen circumferences with the respective maternal pelvic inlet and midpelvis circumferences. Fetal ultrasound and maternal x-ray pelvimetry measurements were performed on 75 term pregnant women with indications for a trial of labor. By means of individually measured fetal and maternal pelvic diameters, circumferences of the fetal head, fetal abdomen, maternal pelvic inlet, and maternal midpelvis were computed. Based on four circumference differences between the fetus and maternal pelvis (fetal head--maternal pelvic inlet, fetal head--maternal midpelvis, fetal abdomen--maternal pelvic inlet, and fetal abdomen--maternal midpelvis), a fetal pelvic index number was derived from the sum of the two most positive values. Of the 27 patients requiring cesarean sections for failure to progress in labor, all but four had positive fetal pelvic index values (sensitivity = 85%). Of the 48 patients who were delivered vaginally, all but four had negative fetal pelvic index values (specificity = 92%).
本研究的目的是通过比较胎儿头围和腹围与相应的母体骨盆入口和中骨盆周长，开发一种识别胎儿骨盆不称的标准化方法。对75名有引产指征的足月孕妇进行了胎儿超声和母体X线骨盆测量。通过单独测量胎儿和母体骨盆直径，计算胎儿头部、胎儿腹部、母体骨盆入口和母体中骨盆的周长。根据胎儿与母体骨盆之间的四个周长差异（胎儿头部-母体骨盆入口、胎儿头部-母体中骨盆、胎儿腹部-母体骨盆入口和胎儿腹部-母体中骨盆），从两个最正值的总和中得出胎儿骨盆指数。在27例因产程无进展而行剖宫产的患者中，除4例外，所有患者的胎儿骨盆指数值均为阳性（敏感性=85%）。在48例经阴道分娩的患者中，除4例外，所有患者的胎儿骨盆指数值均为阴性（特异性=92%）。
