Platt L D, Medearis A L, DeVore G R, Horenstein J M, Carlson D E, Brar H S
Department of Obstetrics and Gynecology, Women's Hospital, Los Angeles, California.
Obstet Gynecol. 1988 Apr;71(4):526-31.
The purpose of this study was to describe the ultrasonic measurement of fetal foot length and to develop mathematical models to quantify the relationships between menstrual age and commonly measured fetal structures. We evaluated 120 patients with known last menstrual periods and normal pregnancies to develop a cross-sectional study population. All patients had ultrasonic measurement of the fetal foot length, biparietal diameter, head circumference, abdominal circumference, and femur length. Least-squares estimation of linear models was used to select the best mathematical models to describe the relationship between menstrual age and fetal foot length. A similar evaluation of the relationship between fetal foot length and the other measured parameters was performed. All models were best described by a linear equation. An R2 value of 0.94, with a standard error of the estimate of 0.204, was obtained for menstrual age versus fetal foot length. When the model for fetal foot length and menstrual age was compared with published anatomical data, close agreement was seen over the time interval studied. Our results suggest that the measurement of fetal foot length with ultrasound gives a reliable assessment of anatomical fetal or neonatal foot length and is highly correlated to the menstrual age of the fetus.
本研究的目的是描述胎儿足长的超声测量方法，并建立数学模型以量化月经龄与常用测量的胎儿结构之间的关系。我们评估了120例末次月经日期已知且妊娠正常的患者，以建立一个横断面研究人群。所有患者均接受了胎儿足长、双顶径、头围、腹围和股骨长度的超声测量。使用线性模型的最小二乘法估计来选择最佳数学模型，以描述月经龄与胎儿足长之间的关系。对胎儿足长与其他测量参数之间的关系进行了类似评估。所有模型均可用线性方程进行最佳描述。月经龄与胎儿足长的R2值为0.94，估计标准误差为0.204。当将胎儿足长与月经龄的模型与已发表的解剖学数据进行比较时，在所研究的时间间隔内观察到密切一致。我们的结果表明，超声测量胎儿足长能可靠地评估胎儿或新生儿的解剖学足长，且与胎儿的月经龄高度相关。
