THE EARLY EXTERNAL CEPHALIC VERSION 2 TRIAL (EEVC2)

该子项目是利用NIH/NCRR资助的中心赠款提供的资源的许多研究子项目之一。子项目和研究者（PI）可能从另一个NIH来源获得主要资金，因此可以在其他CRISP条目中表示。所列机构为中心，不一定是研究者所在机构。本研究的目的是证实一项初步研究的结果，该研究表明，早期头外倒转（ECV）后出生时非头位（臀位）的发生率降低了9.5%，并确定早期开始ECV（34-35周vs 37周妊娠）将降低剖宫产率（CS），而不会增加预产率。足月分娩或严重的胎儿并发症。所有足月妊娠中有3%到4%是臀位妊娠。研究表明，臀位分娩最安全的方法是剖宫产。CS是复杂的孕产妇死亡率和发病率。一种称为头外倒转术（ECV）的技术，从孕37周开始可以降低CS率，但在美国和欧洲的经验中，未经产妇女的成功率为30%。本研究旨在评估从34-35周开始的早期ECV的成功率，并在随机对照试验设计中与妊娠37周的延迟ECV（标准护理）进行比较。

This subproject is one of many research subprojects utilizing the resources provided by a Center grant funded by NIH/NCRR. The subproject and investigator (PI) may have received primary funding from another NIH source, and thus could be represented in other CRISP entries. The institution listed is for the Center, which is not necessarily the institution for the investigator. The goals of this study are to confirm findings of a pilot study that demonstrated a 9.5% reduction in the rate of non-cephalic (breech) presentation at birth following early external cephalic version (ECV) and to determine that beginning ECV early (34-35 vs 37 weeks gestation) will decrease the rate of Cesarean section (CS) without an increase in the rate of pre-term births or serious fetal complications. Three to four percent of all term pregnancies will be breech. Research has indicated that the safest method of delivery of breech presentation is CS. CS is complicated by maternal mortality and morbidity. A technique called external cephalic version (ECV) beginning at 37 weeks gestation can lower the CS rate but the success rate has been 30% for nulliparous women in American and European experience. This research study seeks to evaluate the success rate of early ECV beginning at 34-35 weeks and compare in a randomized controlled trial design to that of delayed ECV at 37 weeks gestation (standard of care).