产前超声诊断双胎绒毛膜性的临床价值

目的:探讨产前超声诊断双胎绒毛膜性的价值。方法:回顾分析我院172例经产后病理证实的双胎绒毛膜性的临床资料,总结其声像图特征。结果:在172例双胎中,其超声图像特点为:首诊孕周≤7孕周均可通过孕囊记数的方法诊断绒毛膜性,诊断符合率为100%,但很难确定羊膜囊性。首诊孕周为8～10孕周可通过记数来判断绒毛膜性和羊膜性,其诊断符合率为100%。首诊孕周为11～14孕周、14～28孕周及>28孕周可通过胎盘的记数、双胎峰征(A)字征、T字征及分隔膜的有无和厚度来判断绒毛膜性,其诊断符合率分别为100%、83.8%、51.9%(P分别>0.05、>0.05、<0.05)。结论:8～10孕周和11～14孕周是超声诊断双胎绒毛膜性的最佳时期。

Prenatalultrasonic Diagnosis of Chorionicity in Twin Pregnancy

Objective: To evaluate the value of prenatalultrasonic diagnosis of chorionicity in twin pregnancy.Methods: The chorionicity confirmed by postnatal pathology in172 twin pregnancy in our hospital were reviewed and the ultrasonic characters were analysised.Results: When the first ultrasonic diagnosis of gestational week ≤7 gestational weeks,chorionicity can be diagnosed by gestational sac count via 100% accuracy,however,it is difficult to confirm amniotic sac.When the first diagnosis of gestational week is during 8~10 gestational weeks,chorionic sac and amniotic sac can be counted via 100% accuracy.When the first diagnosis of gestational week is during 11~14,14~28,or larger than 28 gestational weeks,chorionicity can be diagnosed by placenta count,twin-peak-sign,T-sign,partitive membrane’s existence and thickness.For those different gestational weeks,the accuracy is 100%,83.8%,51.9% respectively(corresponding P>0.05,P>0.05,P<0.05).Conclusion: The 8~10 and 11~14 gestational weeks are the best time to determine the chorionicity of twin pregnancy with ultrasonography.