摘要
目的 研究在不同胎盘缺血情况下胎羊脐带动静脉血流信号的变化。方法 双胎妊娠母羊 2只 ,分别对其胎羊进行结扎脐动脉 ,结扎胎盘小叶及螺旋脐带等处理 ,观察脐血流的改变。结果 结扎一根脐动脉使脐血流阻力增高 ,胎盘小叶被结扎 60 %时 ,脐动静脉血流均有改变。结论 胎盘代偿功能正常下出现胎盘缺血情况 ,胎羊通过一系列生理调节将脐血流维持在正常范围 ,胎盘功能失代偿时 ,先出现脐动脉血流变化 ,继而出现不可逆脐静脉血流变化。在胎盘缺血情况下 ,脐带螺旋易引起脐血流改变。
Objective To study the cord artery and vein blood flow change during different placenta ischemic states.Methods Two twin pregnant sheep were tested by ligating cord artery or placenta cytelydon, and then spiraling several rounds, blood flow change were observed. Results When one cord artery was ligated, the resistance of cord artery blood flow increased, when 60% cytelydon were ligated, both cord artery and vein blood flow changed. Conclusion Under normal placenta condition, when ischemia happened, fetal sheep would keep the blood flow in place by physical adaptation. When the compensation ability of placenta lost, irreversible change of vein blood flow began, and even the least spiral of cord would cut the cord blood flow down.
出处
《中国医学影像技术》
CSCD
2003年第12期1597-1599,共3页
Chinese Journal of Medical Imaging Technology
