Deter R L, Rossavik I K, Carpenter R J
Department of Obstetrics and Gynecology, Baylor College of Medicine, Houston, Texas 77030.
J Clin Ultrasound. 1989 Feb;17(2):83-8. doi: 10.1002/jcu.1870170203.
Using a weight estimation procedure based of the Rossavik growth model, we have evaluated the possibility of establishing individual growth curve standards for fetal weight estimates and of predicting birth weights in the second trimester. In 20 normal fetuses delivered at term, 95% of the weight estimates obtained after 26 weeks' menstrual age (MA) were within +/- 22% of the predicted weight estimates. In these same fetuses the mean difference between birth weight estimates based on growth patterns before 26 weeks, MA, and actual birth weights was 1.2%, with 95% of the percent deviations being between 13.3% and - 8.8%. In a similar prospective study, the mean percent difference was -1.7%, with a range of 9.6% to -13.6%. Direct comparison of weight estimates obtained during the last week before delivery with birth weight projections indicated that birth weight estimates obtained 14 weeks before delivery had smaller systematic and random errors than those obtained within a week of delivery. These results indicate that individual growth curve standards for fetal weight estimates and the growth potential of individual fetuses can be determined from growth patterns in the second trimester.
采用基于罗萨维克生长模型的体重估计程序，我们评估了建立胎儿体重估计的个体生长曲线标准以及预测孕中期出生体重的可能性。在20例足月分娩的正常胎儿中，月经龄（MA）26周后获得的体重估计值中，95%在预测体重估计值的±22%范围内。在这些相同的胎儿中，基于26周MA前生长模式的出生体重估计值与实际出生体重之间的平均差异为1.2%，95%的偏差百分比在13.3%至 -8.8%之间。在一项类似的前瞻性研究中，平均百分比差异为 -1.7%，范围为9.6%至 -13.6%。将分娩前最后一周获得的体重估计值与出生体重预测值进行直接比较表明，分娩前14周获得的出生体重估计值比分娩前一周内获得的估计值具有更小的系统误差和随机误差。这些结果表明，可以根据孕中期的生长模式确定胎儿体重估计的个体生长曲线标准以及个体胎儿的生长潜力。
