B超错误预测巨大儿对正常体重儿剖宫产率的影响

目的探讨B超错误预测胎儿体重对正常体重儿剖宫产率的影响.方法采用回顾性队列研究方法,对我院2年间全部单胎、头位、正常初产妇(196例)按B超结果分为预测巨大儿组(46例)和预测正常体重儿组(150例),比较B超预测假阳性与真阴性产妇的剖宫产率.结果B超预测假阳性组剖宫产率较真阴性组明显增高(75.8%与55.2%),相对危险度(RR)=1.37,RR 95%可信区间(1.877,1.003).结论正常体重儿B超错误预测为巨大儿可增加其剖宫产率.

Ultrasonographic prediction of fetal weight and the cesarean section rate resulting from it

Objective:To investigate if the incorrect ultrasonographic prediction of macrosomia affects the cesarean delivery rate among non - macrosomic neonatal group. Methods:Retrospective cohort strdy. All normal primigravidae (total 196 cases) with singleton, vertex presentation were grouped according to their sonography predictive result, as macrosomic group (46 cases) and normal group (150 cases). C-section rate of false - positive and true - positive groups was compared. Results: The rate of cesarean delivery was significantly higher among those falsely diagnosed by ultrasonography with a macrosomic fetus as compared to those with a fetus truly diagnosed as non - macrosomic( 75.8% vs 55.2%; relative risk (KR)=1.37;95% confidence interval 1 877, 1.003). Conclusion: Ultrasonographic diagnosis of suspected macrosomia is associated with a significant increase in cesarean delivery rates even in normal neonates group.