Haney A F, Crenshaw M C, Dempsey P J
Obstet Gynecol. 1978 May;51(5):609-13. doi: 10.1097/00006250-197805000-00022.
Twins of dissimilar size have increased risks both at delivery and in the neonatal period. When dissimilar growth is severe, it should be reflected in birthweight and biparietal diameter (BPD) growth. Sonograms were done on 74 of 106 sets of twins delivered from July 1, 1973, to June 30, 1977. Excluding prematurity and birth trauma, the difference in BPD between twins with normal outcomes in the last scan prior to delivery was 1.32 +/- 0.20 mm (mean +/- SE) and the difference in birthweight was 250.3 +/- 31.4 g (mean +/- SE). In 7 sets of twins with poor outcomes (intrauterine fetal demise or severe intrauterine growth retardation) without central nervous system anomalies the difference in BPD between twins in the last scan, while both fetuses were alive, was 6.86 +/- 1.06 mm (mean +/- SE) and the difference in birthweight was 604.3 +/- 217.2 g (mean +/- SE). Both the BPDs and birthweights are significantly different at the P less than 0.01 level. Large differences in BPD between twins may possibly indicate compromise of one twin.
大小不同的双胞胎在分娩时和新生儿期都有更高的风险。当生长差异严重时，应反映在出生体重和双顶径（BPD）的增长上。对1973年7月1日至1977年6月30日分娩的106对双胞胎中的74对进行了超声检查。排除早产和出生创伤，分娩前最后一次扫描结果正常的双胞胎之间的双顶径差异为1.32±0.20毫米（平均值±标准误），出生体重差异为250.3±31.4克（平均值±标准误）。在7对结局不良（宫内胎儿死亡或严重宫内生长迟缓）且无中枢神经系统异常的双胞胎中，在最后一次扫描时两个胎儿均存活，双胞胎之间的双顶径差异为6.86±1.06毫米（平均值±标准误），出生体重差异为604.3±217.2克（平均值±标准误）。双顶径和出生体重在P<0.01水平上均有显著差异。双胞胎之间双顶径的巨大差异可能表明其中一个胎儿存在问题。
