孕早期单绒毛膜多胎妊娠中卵黄囊数量不能预测羊膜性。
Number of yolk sacs does not predict amnionicity in early first-trimester monochorionic multiple gestations.
作者信息
Shen O, Samueloff A, Beller U, Rabinowitz R
机构信息
Department of Obstetrics and Gynecology, Shaare Zedek Medical Center, Faculty of Health Sciences, Ben-Gurion University of the Negev, Jerusalem, Israel.
出版信息
Ultrasound Obstet Gynecol. 2006 Jan;27(1):53-55. doi: 10.1002/uog.2637.
OBJECTIVE
To determine the relationship between amnionicity and number of yolk sacs before 11 weeks of gestation.
METHODS
Twenty-two cases of monochorionic multiple pregnancy were scanned before 11 weeks of gestation. There were 21 sets of twins and one of triplets. Amnionicity was determined by visualization of a dividing amniotic membrane between the gestational sacs. The number of yolk sacs was recorded and compared with the presence or absence of a dividing membrane for all fetuses.
RESULTS
In 17/20 (85%) cases of monochorionic diamniotic twins, two yolk sacs were seen. In 3/20 (15%) cases of monochorionic diamniotic twins, a single yolk sac was seen. In the one case of monochorionic diamniotic triplets, two yolk sacs were visualized. In one case of monoamniotic twins, a single yolk sac was observed.
CONCLUSIONS
In monochorionic pregnancies, the presence of two yolk sacs predicts diamnionicity. However, the use of the number of yolk sacs as a predictor of amnionicity may not be accurate in a small proportion of patients. The diagnosis of monoamnionicity can be made only following a careful search for a dividing amniotic membrane.
目的
确定妊娠11周前羊膜性与卵黄囊数量之间的关系。
方法
对22例单绒毛膜多胎妊娠在妊娠11周前进行超声扫描。其中有21对双胞胎和1例三胞胎。通过观察妊娠囊之间的分隔羊膜来确定羊膜性。记录所有胎儿的卵黄囊数量，并与是否存在分隔膜进行比较。
结果
在17/20（85%）的单绒毛膜双羊膜囊双胎病例中，可见两个卵黄囊。在3/20（15%）的单绒毛膜双羊膜囊双胎病例中，可见一个卵黄囊。在1例单绒毛膜双羊膜囊三胞胎病例中，可见两个卵黄囊。在1例单羊膜囊双胎病例中，观察到一个卵黄囊。
结论
在单绒毛膜妊娠中，两个卵黄囊的存在预示着双羊膜性。然而，在一小部分患者中，使用卵黄囊数量作为羊膜性的预测指标可能不准确。单羊膜性的诊断只能在仔细寻找分隔羊膜后做出。
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