Chan Karen K L, Lao Terence T
Department of Obstetrics and Gynaecology, University of Hong Kong, Hong Kong, SAR, China.
Acta Haematol. 2006;116(1):41-5. doi: 10.1159/000092346.
Placental size may be influenced by maternal factors, placental function as well as the fetal condition. So far, no studies have examined how the fetal oxygen-carrying capacity or haemoglobin/haematocrit levels would affect placental growth in normal human pregnancies. The aim of this study was to investigate the relationships between placental size and fetal arterial cord blood haemoglobin and haematocrit levels at the time of caesarean delivery. Umbilical arterial cord blood was taken for arterial haemoglobin and haematocrit levels immediately after delivery. The relative placental size (defined by the ratio of placental weight to fetal weight) was inversely correlated with both arterial haemoglobin (r = -0.455, p = 0.001) and haematocrit levels (r = -0.425, p = 0.003) in women who had undergone elective caesarean sections. No significant correlation was found between the relative placental size with other maternal and fetal factors.
胎盘大小可能受母体因素、胎盘功能以及胎儿状况的影响。迄今为止，尚无研究探讨胎儿携氧能力或血红蛋白/血细胞比容水平如何影响正常人类妊娠中的胎盘生长。本研究的目的是调查剖宫产时胎盘大小与胎儿动脉脐带血血红蛋白和血细胞比容水平之间的关系。分娩后立即采集脐动脉血以测定动脉血红蛋白和血细胞比容水平。在接受择期剖宫产的女性中，相对胎盘大小（由胎盘重量与胎儿重量之比定义）与动脉血红蛋白（r = -0.455，p = 0.001）和血细胞比容水平（r = -0.425，p = 0.003）均呈负相关。未发现相对胎盘大小与其他母体和胎儿因素之间存在显著相关性。
