Department of Obstetrics and Gynecology, Japanese Red Cross Katsushika Maternity Hospital, 5-11-12 Tateishi, Katsushika-ku, Tokyo, Japan.
Arch Gynecol Obstet. 2010 Jan;281(1):65-9. doi: 10.1007/s00404-009-1064-6. Epub 2009 Mar 31.
We examined the incidence of abnormally shaped placentae such as circumvallate placenta and succenturiate lobes of placenta and their complications in twin compared with singleton pregnancies.
A retrospective cohort study was performed with 592 (174 monochorionic and 418 dichorionic) twin and 11,311 singleton pregnancies managed at our hospital between 2000 and 2007.
There was no measurable difference in the incidence of circumvallate placenta between twin and singleton pregnancies (1.2% vs. 1.9%), while the incidence of succenturiate lobes of placenta in twin pregnancies was significantly higher than that in singleton pregnancies (1.5% vs. 0.73%, P = 0.033). In singleton pregnancies, the incidences of placental complications such as placental abruption, vasa previa and retained placenta were observed to be associated with the presence of abnormally shaped placentae. In the twin pregnancies, however, there were no relation between the incidences of placental complications and the presence of abnormally shaped placentae.
Succenturiate lobes of placenta were more common in twin pregnancies compared with singleton pregnancies. However, the presence of abnormally shaped placentae does not seem to affect perinatal outcomes in twin pregnancies.
我们研究了在双胞胎妊娠中与单胎妊娠相比，异常形状胎盘（如环状胎盘和副叶胎盘）及其并发症的发生率。
对 2000 年至 2007 年在我院治疗的 592 例（174 例单绒毛膜和 418 例双绒毛膜）双胞胎和 11311 例单胎妊娠进行了回顾性队列研究。
双胞胎妊娠中环状胎盘的发生率与单胎妊娠无明显差异（1.2% vs. 1.9%），而双胞胎妊娠中副叶胎盘的发生率明显高于单胎妊娠（1.5% vs. 0.73%，P = 0.033）。在单胎妊娠中，胎盘并发症（如胎盘早剥、前置血管和胎盘滞留）的发生率与异常形状胎盘的存在有关。然而，在双胞胎妊娠中，胎盘并发症的发生率与异常形状胎盘的存在之间没有关系。
与单胎妊娠相比，副叶胎盘在双胞胎妊娠中更为常见。然而，异常形状胎盘的存在似乎并不影响双胞胎妊娠的围生期结局。
