如何判断骨盆出口平面的头盆不称

【目的】探讨一种更好判断骨盆出口平面头盆不称的方法。【方法】选择 2 0 0例正常足月妊娠的孕妇 ,用骨盆出口后三角外接圆面积与胎头横截面积比较的方法和传统的判断试产的方法来决定孕妇分娩的方式。然后用精确概率计算的方法比较两种方法判断试产的准确性。【结果】传统的判断试产的方法 ,剖宫产率为 11 8%。而骨盆后三角外接圆面积与胎头横截面积比较的方法 ,剖宫产率为 5 8%。两者的差异经统计学的处理 ,有显著性意义。【结论】骨盆出口后三角外接圆面积与胎头横截面积比较是一个定量的判断试产的标准 ,判断试产的准确性高。

How to Judge Cephalopelvic Disproportion on Plane of the Pelvic Outlet

Objective To study a better method of judging cephalopelvic disproportion on plane pelvic outlet. Methods 200 term pregnant women were enrolled. The way of parturition was determined by comparing circumcircle area of posterior triangle of exitus pelvis with fetal head cross section area and traditional method. Then assessed the accuracy of each method with Fisher's exact test. Results The Cesarean section rate of traditional method for judging trial of labour was 11 8%. That of comparing circumcircle area of posterior triangle of exitus pelvis with fetal head cross section area for judging trial of labour was 5 8%. The difference between two methods was statistical significant. Conclusion The method of comparing circumcircle area of posterior triangle of exitus pelvis with fetal head cross section area is a quantitative criteria for iudging trial of labour. It's accuracy of judging trial of labour is high.