Department of Obstetrics and Gynecology of Nanfang Hospital, Southern Medical University, Guangzhou, 510515, China.
Imaging Department of Nanfang Hospital, Southern Medical University, Guangzhou, 510515, China.
Arch Gynecol Obstet. 2018 Aug;298(2):433-441. doi: 10.1007/s00404-018-4814-5. Epub 2018 Jun 13.
To analyze the relationship between fetal head size and maternal pelvis size using magnetic resonance imaging (MRI) with a 3-D reconstruction technique.
A total of 301 nulliparous full-term Chinese pregnant women with cephalic presentation were enrolled and received MRI examinations before labor onset. Data were collected and imported into Mimics software to reconstruct the maternal pelvis and fetus.
Of 301 pregnant women, 212 underwent vaginal delivery and 32 received cesarean section. The body mass index (BMI) was significantly different between the vaginal delivery group and the suspected cephalopelvic disproportion (CPD) group; the larger the BMI, the higher was the risk of CPD. The transverse diameter of the pelvic inlet and the posterior sagittal diameter of the midpelvis were significantly larger in the vaginal delivery group, compared with the suspected CPD group. Fetal weight > 3.5 kg could be used as a diagnostic indicator for CPD.
BMI is a risk factor for CPD, and fetal weight < 3.5 kg is an important diagnostic indicator for natural delivery in Chinese pregnant women.
利用磁共振成像（MRI）三维重建技术分析胎儿头围与母体骨盆大小的关系。
共纳入 301 例足月、头位的初产妇，于分娩前进行 MRI 检查。采集数据并导入 Mimics 软件，重建母体骨盆和胎儿。
301 例孕妇中，212 例经阴道分娩，32 例接受剖宫产。阴道分娩组与疑似头盆不称（CPD）组的体质量指数（BMI）差异有统计学意义；BMI 越大，CPD 风险越高。骨盆入口横径和中骨盆后矢状径在阴道分娩组明显大于疑似 CPD 组。胎儿体重>3.5kg 可作为 CPD 的诊断指标。
BMI 是 CPD 的危险因素，胎儿体重<3.5kg 是中国孕妇自然分娩的重要诊断指标。
