Bora S A, Papageorghiou A T, Bottomley C, Kirk E, Bourne T
Early Pregnancy and Gynaecological Ultrasound Unit, St George's, University of London, London, UK.
Ultrasound Obstet Gynecol. 2008 Oct;32(5):618-21. doi: 10.1002/uog.6133.
To assess the agreement in the diagnosis of chorionicity and amnionicity between transvaginal ultrasound examination at 7-9 weeks' gestation and at the 11-14-week transabdominal scan.
This was a retrospective analysis of prospectively collected data of twin pregnancies over a 3-year period. Chorionicity and amnionicity were assessed in women with viable twin pregnancies who underwent a transvaginal ultrasound scan at between 7 and 9 weeks' gestation. These findings were compared with the diagnoses of chorionicity and amnionicity at the subsequent 11-14-week scan in these women.
Chorionicity and amnionicity were documented in 67 viable twin pregnancies at both 7-9 and 11-14 weeks' gestation. There was agreement in the chorionicity and amnionicity reported at each of the two scans in 65 out of 67 (97%) cases. Of the dichorionic-diamniotic (DCDA) pregnancies reported at 7-9 weeks, 53 out of 54 (98%) were confirmed at the 11-14-week scan and one (2%) was found to be monochorionic-diamniotic (MCDA). However, at birth these twins were of different sex, confirming DCDA twins as initially diagnosed at 7-9 weeks. Of the 12 pregnancies diagnosed as MCDA at 7-9 weeks, all were found to be MCDA at the 11-14-week scan. There was one monochorionic-monoamniotic (MCMA) pregnancy diagnosed at 7-9 weeks that was subsequently found to be MCDA at the 11-14-week scan.
Transvaginal ultrasound examination at 7-9 weeks' gestation shows very high agreement with the 11-14-week scan in the diagnosis of chorionicity and amnionicity in twin pregnancies, suggesting that it provides a similar level of accuracy. Accuracy may be higher for DC twins than MC twins, which may relate to the gestational age at which the sonographic appearance of the amniotic sac develops.
评估妊娠7 - 9周经阴道超声检查与妊娠11 - 14周经腹超声检查在绒毛膜性和羊膜性诊断上的一致性。
这是一项对3年期间前瞻性收集的双胎妊娠数据的回顾性分析。对妊娠7至9周接受经阴道超声扫描的存活双胎妊娠女性进行绒毛膜性和羊膜性评估。将这些结果与这些女性随后在11 - 14周扫描时的绒毛膜性和羊膜性诊断结果进行比较。
在妊娠7 - 9周和11 - 14周时，对67例存活双胎妊娠记录了绒毛膜性和羊膜性情况。67例中的65例（97%）在两次扫描中报告的绒毛膜性和羊膜性情况一致。在妊娠7 - 9周报告为双绒毛膜双羊膜囊（DCDA）的妊娠中，54例中的53例（98%）在11 - 14周扫描时得到证实，1例（2%）被发现为单绒毛膜双羊膜囊（MCDA）。然而，出生时这对双胞胎性别不同，证实最初在7 - 9周诊断的DCDA双胞胎情况。在妊娠7 - 9周诊断为MCDA的12例妊娠中，在11 - 14周扫描时均被发现为MCDA。有1例在妊娠7 - 9周诊断为单绒毛膜单羊膜囊（MCMA）的妊娠，随后在11 - 14周扫描时被发现为MCDA。
妊娠7 - 9周经阴道超声检查在双胎妊娠绒毛膜性和羊膜性诊断方面与11 - 14周扫描显示出非常高的一致性，表明其准确性相当。双绒毛膜双胎的准确性可能高于单绒毛膜双胎，这可能与羊膜囊超声表现出现的孕周有关。
