多普勒超声对正常晚期妊娠胎儿脐动脉血流的测定

The Measurement of Umbical Artery Flow Velocity Waveforms in Normal Late Pregnancy by Doppler Ultrasound

本文来用多普勒超声对28～41孕周81例正常晚期妊娠者的胎儿脐动脉血流速度波形进行了测定,以收缩期血流速度峰值与舒张期血流速度最低值之比值(A/B)和阻力指数(Pol值)作为估计胎盘血流阻力的指标。结果表明:A/B值(2.34±0.44)和Pol值(0.56±0.07)均随孕周增长而逐渐下降,二者均与孕周呈良好负相关(r_1==0.90、r_2=-0.93).提示胎盘血流阻力下降。该方法为临床提供了一项新的无创性监测胎盘血流阻力的手段。

Doppler ultrasound was adopted in astudy of fetal umbilical artery flow velo-city waveforms in 81 cases of late pregnan-cies (28--41 gestational weeks). The peaksystolic/end -- diastolicratio (A / B ) and thepourlot index were used as indices forassessing placental resistance. Both theA/B ratio (2.34±0.44) and Pourlot index(0.56±0. 07)decreased while the gestationalweek was increasing, and they had a goodcorrelation with the gestational week(r_1 =-0.90, r_2=-0.93).The results indicated thatthe placental resistance became lowerwhen the gestational week was increasing.This method has been documented auseful noninvasive technique for theexam of placental resistance.