Hohler C W, Doherty R A, Lea J, Newhouse J, Felix J
Obstet Gynecol. 1978 Nov;52(5):555-7.
In an unselected, consecutive series of 137 midtrimester amniocenteses for prenatal genetic diagnosis, it was found that the incidence of blood contamination of amniotic fluid samples was similar regardless of placental site as determined by ultrasound localization. Three (5.8%) patients with anterior placental location versus 5 (9.1%) patients with posterior placentas had gross blood in the amniotic fluid by visual inspection. These results support the view that placental penetration during amniocentesis is not the major cause of bloody taps. Ultrasound studies done prior to midtrimester amniocentesis should, perhaps, be more specifically evaluated in relation to pregnancy information obtained rather than solely as an aid to improve technical performance of amniocentesis.
在一组未经筛选的、连续的137例孕中期羊膜腔穿刺术用于产前基因诊断中，发现无论超声定位确定的胎盘位置如何，羊水样本血液污染的发生率相似。经肉眼检查，胎盘位于前位的3例（5.8%）患者与胎盘位于后位的5例（9.1%）患者羊水内有明显血液。这些结果支持这样一种观点，即羊膜腔穿刺术期间胎盘穿刺不是血性穿刺的主要原因。或许，孕中期羊膜腔穿刺术前进行的超声检查应根据所获得的妊娠信息进行更具体的评估，而不仅仅作为提高羊膜腔穿刺术技术操作的辅助手段。
