Imai S, Takemura T, Nabuchi K, Nakayama M
Nihon Sanka Fujinka Gakkai Zasshi. 1987 Jul;39(7):1069-72.
Eleven of 157 twin pregnancies were complicated with polyhydramnios. Chorionicity, vascular anastomosis and insertion of the umbilical cord were analyzed with relation to polyhydramnios. 1. Polyhydramnios was found commonly in monochorionic placentation. 2. Vascular anastomosis was found in 40% of monochorionic polyhydramnotic placentas, which was lower than the anastomosis of monochorionic non-polyhydramniotic placentas. 3. The placentas with hydramnios had a higher incidence of abnormal umbilical insertion (marginal or velamentous insertion). These data indicate that incompetent vascular connections between the two fetoplacental circulations may be the pathogenesis of polyhydramnios.
157例双胎妊娠中有11例合并羊水过多。分析了绒毛膜性、血管吻合情况及脐带附着与羊水过多的关系。1. 羊水过多常见于单绒毛膜胎盘妊娠。2. 在40%的单绒毛膜羊水过多胎盘病例中发现有血管吻合，低于单绒毛膜非羊水过多胎盘的吻合率。3. 羊水过多的胎盘脐带附着异常（边缘性或帆状附着）发生率更高。这些数据表明，两个胎儿 - 胎盘循环之间血管连接功能不全可能是羊水过多的发病机制。
