Is there a relationship between estimated fetal weight and umbilical artery Doppler impedance indices?
Is there a relationship between estimated fetal weight and umbilical artery Doppler impedance indices?
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DOI：
10.1002/uog.188
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发表时间：
2003-08-01
影响因子：
7.1
通讯作者：
Farrell, T
中科院分区：
文献类型：
--
作者：
Owen, P;Murphy, J;Farrell, T
目的探讨孕晚期估计胎儿体重（EFW）与脐动脉多普勒波形阻抗指数之间是否存在相关性。方法获取2 74例低危妊娠的胎儿搏动指数（PI）和S/D（收缩/舒张）比值以及EFW。从妊娠 30 周直至分娩，每两周进行一次测量。在 30-32、33-35、36-38 和 39-41 周的胎龄范围内寻找两个阻抗指数和 EFW 之间的关系。结果 有 918 对 PI（带 S/D）和 EFW 可用于分析。正如预期的那样，阻抗指数的平均值随着胎龄的增加而下降。在任何胎龄范围内，阻抗指数和 EFW 之间不存在临床相关性。结论 脐动脉多普勒波形的阻抗指数随着胎龄的增加而降低，至少部分是由于胎盘血管树的扩张。在妊娠晚期的狭窄胎龄范围内，胎儿体重和阻抗指数之间没有有意义的相关性。因此，无需调整脐动脉多普勒阻抗指数来考虑胎儿大小。版权所有 (C) 2003 ISUOG。
Objective To establish whether there is a relationship between estimated fetal weight (EFW) and umbilical artery Doppler waveform impedance indices in the third trimester.Methods The pulsatility index (PI) and S/D (systolic/diastolic) ratio were obtained together with the EFW from 2 74 low-risk pregnancies. Measurements were made at fortnightly intervals from 30 weeks' gestation until delivery. A relationship between the two impedance indices and EFW was sought at gestational age ranges of 30-32, 33-35, 36-38 and 39-41 weeks.Results There were 918 pairs of PI (with S/D) and EFW available for analysis. The mean of the impedance indices decreased with advancing gestational age as expected. There was no clinically relevant correlation between impedance indices and EFW within any of the gestational age ranges.Conclusion Impedance indices from the umbilical artery Doppler waveform decrease with advancing gestational age due, at least partially, to expansion of the placental vascular tree. Within narrow gestational age ranges in the third trimester, there is no meaningful correlation between fetal weight and impedance indices. It is therefore not necessary to adjust umbilical artery Doppler impedance indices to account for fetal size. Copyright (C) 2003 ISUOG.