Secher N J, Kaern J, Hansen P K
Obstet Gynecol. 1985 Jul;66(1):63-8.
In 80 consecutive twin pregnancies, prenatal measurements of fetal biparietal diameter (BPD) and abdominal diameter were made and growth curves were calculated using routine ultrasound examinations. Nineteen percent of the infants were growth retarded. Growth retardation was found in both fetuses in four pregnancies and in one fetus in 22 other pregnancies. Linear regression analysis between birth weight and gestational age showed the standard deviation of birth weight to be proportional to gestational age. A more linear growth curve also was found when the mean fetal weight was calculated by use of the BPD and abdominal diameter measurements in the formula developed for singletons. The estimated weight compared with birth weight in 62 twins who had ultrasound examinations less than seven days before delivery showed a significant correlation (r = 0.89, P less than .001) with a coefficient of variation of 12.4%. The identification of intrauterine growth retardation (IUGR) in twin pregnancies by ultrasound had a sensitivity of 62%, a specificity of 98%, and a predictive value of positive and negative test of 93% and 83%, respectively.
在80例连续双胎妊娠中，通过常规超声检查对胎儿双顶径（BPD）和腹径进行产前测量，并计算生长曲线。19%的婴儿生长受限。在4例妊娠中，两个胎儿均生长受限；在另外22例妊娠中，有一个胎儿生长受限。出生体重与孕周之间的线性回归分析显示，出生体重的标准差与孕周成正比。当使用为单胎制定的公式，通过双顶径和腹径测量计算胎儿平均体重时，也发现了更线性的生长曲线。对62例在分娩前不到7天接受超声检查的双胎进行估计体重与出生体重比较，结果显示两者显著相关（r = 0.89，P <.001），变异系数为12.4%。超声识别双胎妊娠中的宫内生长受限（IUGR），其敏感性为62%，特异性为98%，阳性和阴性试验的预测值分别为93%和83%。
