Kadji Caroline, Cannie Mieke M, Van Wettere Morgane, Bevilacqua Elisa, Dütemeyer Vivien, Strizek Brigitte, Khalifé Joe, Kang Xin, Jani Jacques C
Fetal Medicine Unit, Department of Obstetrics and Gynecology, University Hospital Brugmann, Université Libre de Bruxelles, Brussels, Belgium.
Fetal Diagn Ther. 2017;42(3):181-188. doi: 10.1159/000453356. Epub 2017 Apr 14.
To prospectively compare magnetic resonance (MR) estimation of fetal weight (MR-EFW) performed at third trimester with ultrasound (US) estimation of fetal weight (US-EFW) and actual birth weight, and to evaluate factors influencing fetal growth rate near term.
US-EFW and MR-EFW were calculated at a median of 33.0 and 37.7 weeks of gestation in 37 fetuses and plotted on curve centiles to predict birth weights at 39.3 weeks of gestation. The median absolute relative errors for predicted US-EFW and MR-EFW were calculated. Regression analysis was used to investigate the effect of different variables on fetal growth rate at 35.2 weeks of gestation.
The relative error of actual birth weight as predicted by US at 33.0 weeks was significantly higher compared with MR (7.33 vs. 4.11%; p = 0.001). This was also the case for fetal weight predicted by US at 37.7 weeks as compared with MR (6.63 vs. 2.60%; p < 0.01). Fetal growth rate was significantly and independently positively associated with the mother's weight and with gestational age at estimation (p < 0.05 for both variables).
Fetal weight estimates predicted using MR at third trimester are better than those given by prenatal US. Fetal growth rate depends on fetal and maternal characteristics.
前瞻性比较孕晚期磁共振成像（MR）估算胎儿体重（MR-EFW）与超声（US）估算胎儿体重（US-EFW）及实际出生体重，并评估影响孕晚期胎儿生长速率的因素。
对37例胎儿在妊娠33.0周和37.7周时分别计算US-EFW和MR-EFW，并绘制在百分位数曲线上以预测妊娠39.3周时的出生体重。计算预测的US-EFW和MR-EFW的中位数绝对相对误差。采用回归分析研究不同变量对妊娠35.2周时胎儿生长速率的影响。
在33.0周时，US预测的实际出生体重相对误差显著高于MR（7.33%对4.11%；p = 0.001）。在37.7周时，US预测的胎儿体重相对误差与MR相比也是如此（6.63%对2.60%；p < 0.01）。胎儿生长速率与母亲体重和估算时的孕周显著且独立正相关（两个变量p均< 0.05）。
孕晚期使用MR预测的胎儿体重优于产前US预测的结果。胎儿生长速率取决于胎儿和母亲的特征。
