Kok M, Cnossen J, Gravendeel L, Van Der Post J A, Mol B W
Department of Obstetrics and Gynecology, Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands.
Ultrasound Obstet Gynecol. 2009 Jan;33(1):76-84. doi: 10.1002/uog.6277.
To systematically review the medical literature reporting on ultrasound factors that can be predictive for the outcome of an attempt at external cephalic version (ECV).
MEDLINE, EMBASE and Cochrane Central Register of Controlled Trials were searched. Studies reporting on potential ultrasound prognosticators and ECV success rates that allowed construction of a 2x2 table were selected.
We selected 37 primary articles reporting on 7709 women. Posterior placental location (odds ratio (OR), 1.9; 95% CI, 1.5-2.4), complete breech position (OR, 2.3; 95% CI, 1.9-2.8) and an amniotic fluid index>10 (OR, 1.8; 95% CI, 1.5-2.1) were predictors of successful ECV.
Success of an ECV attempt is associated with ultrasound parameters such as fetal position, amniotic fluid and placental location. This knowledge can be used to develop a prognostic model to predict successful ECV.
系统回顾医学文献中关于可预测外倒转术（ECV）尝试结果的超声因素。
检索了MEDLINE、EMBASE和Cochrane对照试验中央登记册。选择了报告潜在超声预后因素和ECV成功率且允许构建2×2表格的研究。
我们选择了37篇关于7709名女性的原始文章。胎盘后置（比值比（OR），1.9；95%置信区间，1.5 - 2.4）、完全臀位（OR，2.3；95%置信区间，1.9 - 2.8）和羊水指数>10（OR，1.8；95%置信区间，1.5 - 2.1）是ECV成功的预测因素。
ECV尝试的成功与诸如胎儿位置、羊水和胎盘位置等超声参数相关。这些知识可用于开发预测ECV成功的预后模型。
