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作者对所有作产前诊断的孕妇,于羊膜穿刺术前常规地进行超声显像检查,如果判断为双胎,用染料注射法(即用1～3毫升的靛胭脂稀释液)以区别不同的羊膜囊,接着吸出第一个羊水标本,随即在超声显像判定第二个胎儿位置同时作第二个羊膜穿刺术,如吸出无色的羊水则提示已进入第二个。羊膜囊。相反,如吸出有染料色的羊水:则提示又进入原来的羊膜囊。对单羊膜囊双胎用本法不可能对每个胎儿进行研究。作者遇到17例双胎妊娠,有2例未作穿刺术,13例穿刺成功证明为两个羊膜囊及两。个胎儿。1例由于穿刺第2个羊膜囊数次而未成功。在1例不常见的病例中,两个胎儿中之一有严重的胎儿发育迟缓,并伴有羊水
The author of all prenatal diagnosis of pregnant women, routine amniocentesis before ultrasound imaging examination, if judged twins, with dye injection (ie with 1 to 3 ml of indigo carmine dilution) to distinguish between different Amniotic sac, and then sucked out the first amniotic fluid specimens, then in the ultrasound imaging to determine the location of the second fetus for the second amniocentesis, aspiration of colorless amniotic fluid is prompted to have entered the second. Amniotic sac. On the contrary, aspirated with a dye-colored amniotic fluid: it prompts into the original amniotic sac. It is not possible to study each fetus with single amniotic sac twins. The authors met 17 twin pregnancies, two had no puncture, and 13 successfully demonstrated two amniotic sacs and two amniocentesis. A fetus One case failed due to puncturing the second amniotic sac several times. In one unusual case, one of the two fetuses had severe fetal retardation and was associated with amniotic fluid