经阴道超声对前置胎盘的诊断价值

目的：探讨经阴道超声（TVS）对前置胎盘的诊断价值。方法：对78例孕妇的胎盘分别采用经腹部超声（TAS）和TVS检查进行定位，并与产时诊断进行比较。结果：TVS检查诊断与产时诊断比较，敏感性、特异性、假阳性率和符号率分别为100％，90％，10％和93．6％；TAS则分别为71．4％，40％和64．1％。TVS的符号率与TAS比较，差异有显著性（P＜0．01）。结论：TVS对前置胎盘的诊断优于TAS。

Value of transvaginal sonography in diagnosis of placenta previa]

OBJECTIVE: To investigate the value of transvaginal sonography (TVS) in diagnosis of placenta previa. METHODS: Transabdominal sonography(TAS) and TVS localization of the placenta were performed in 78 pregnant women after 35 week's gestation. It was suspected of having placenta previa when the placental edge appeared to be over or within 2 cm in diameter of the internal cervical os demonstrated by TAS or TVS. Final diagnosis depended on diagnosis at delivery. The diagnostic sensitivity, specificity, false-positive rate and coincidence rate were made in comparison between TVS and TAS. RESULTS: The sensitivity, specificity, false-positive rate and coincidence rate of TVS were 100%, 90%, 10% and 93.6%, while that of TAS were 71.4%, 60%, 40% and 64.1%, respectively. The coincidence rate of TVS was better than TAS (p < 0.01). CONCLUSION: TVS is superior to TAS in diagnosis of placenta previa.