Watson W J, Harlass F E, Menard M K, McCurdy C M, Brady K, Miller R C
Department of Maternal Fetal Medicine, Sioux Valley Hospital, Sioux Falls, South Dakota, USA.
Am J Perinatol. 1995 Mar;12(2):122-4. doi: 10.1055/s-2007-994421.
A sonographic standard for assessment of amniotic fluid volume in normal twin pregnancy is provided. In 210 uncomplicated twin pregnancies, amniotic fluid volume was assessed sonographically, by measuring the total amniotic fluid index (AFI), as well as the deepest single vertical pocket in each sac. The mean AFI was greater than values found in singleton gestations; the AFI increased up to 27 weeks' gestation, and decreased thereafter. It correlated well with measurement of the deepest vertical pocket in each sac (r = 0.71; p < 0.0001). In twin pregnancy at 26 to 32 weeks' gestation a fluid pocket of at least 8 cm was found in 9.8% of cases and did not indicate pathologic states. Either AFI or measurement of the deepest fluid pocket in each sac can be used to assess fluid volume in twin pregnancy. A table specific to twin pregnancy should be used when evaluating twin gestations sonographically.
本文提供了一种用于评估正常双胎妊娠羊水量的超声标准。在210例无并发症的双胎妊娠中，通过测量总羊水指数（AFI）以及每个羊膜囊内最深的单个垂直羊水池，对羊水量进行超声评估。双胎妊娠的平均AFI大于单胎妊娠的值；AFI在妊娠27周前上升，之后下降。它与每个羊膜囊内最深垂直羊水池的测量值相关性良好（r = 0.71；p < 0.0001）。在妊娠26至32周的双胎妊娠中，9.8%的病例发现至少8 cm的羊水池，且这并不表明存在病理状态。AFI或每个羊膜囊内最深羊水池的测量均可用于评估双胎妊娠的羊水量。在对双胎妊娠进行超声评估时，应使用专门针对双胎妊娠的表格。
