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关键词：胎儿；大脑中动脉；血流参数
摘 要 目的：确定正常中孕胎儿大脑中动脉血流参数的正常值范围。方法：应用彩色多普勒能量图及脉冲多普勒技术对215例16～31孕周正常胎儿大脑中动脉血流参数进行检测。结果：正常胎儿大脑中动脉的最大流速及平均流速随孕周的增加而加快。阻力指数在孕16～24周时随孕周的增加而升高，孕24～31周时保持高水平。最大流速、平均流速及阻力指数与推算出的胎儿体重呈正相关。结论：本研究为多普勒超声早期预测胎儿高动力循环状态提供了理论依据。
ReferenceRanges of Blood Flow Parameters of the Normal
Second-trimester Fetal Middle Cerebral Artery
Luo Zhinong Wei Huaixin Guo Huiping
The 157th Hospital of PLA,Guangzhou,510510 China
ABSTRACT Objective:To assess reference ranges of bloodflow parameters of the normal second-trimester fetal middle cerebral artery.Methods：Bloodflow parameters of middle cerebral artery were assessed in 215 normal fetuses at 16 to 31weeks gestation by color Doppler power imaging and pulsed Doppler.Results:During 16 to31 weeks gestation,maximum and mean blood flow velocities of fetal middle cerebralartery were increased with gestation age.Resistance indexes of fetal middle cerebralartery were increased with gestation age during 16 to 24 weeks gestation and then kepthigh level during 24 to 31 weeks gestation.Maximum blood flow,mean blood flowvelocities,resistance index are all positively correlative to fetalweight.Conclusions:This study offers a theoretic basis for the early prediction of fetalhyperdynamic circulation with Doppler ultrasound.
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