Wladimiroff J W, Huisman T W, Stewart P A, Stijnen T
Department of Obstetrics and Gynecology, Academic Hospital Rotterdam-Dijkzigt, Erasmus University, The Netherlands.
Am J Obstet Gynecol. 1992 Mar;166(3):921-4. doi: 10.1016/0002-9378(92)91363-f.
Our objectives were to determine flow velocity waveform patterns in the fetal inferior vena cava and to relate these waveforms to transtricuspid and umbilical artery waveforms and fetal heart rate in early gestation.
Doppler waveforms were recorded in 40 normal fetuses at 11 to 16 weeks of gestation. Only transvaginal scanning was carried out at 11 to 12 weeks and only transabdominal scanning was used at 15 to 16 weeks.
The ratio of time velocity integrals of flow from the inferior vena cava during systole and early diastole, the percentage of reverse flow in this vessel, the pulsatility index from the umbilical artery, and the fetal heart rate were negatively correlated with gestational age. Peak E-wave and A-wave velocities and E/A ratios from the transtricuspid waveforms were positively correlated with gestational age.
Early normal pregnancies are associated with remarkable changes in fetal flow velocity waveforms at both the cardiac and the extracardiac level.
我们的目的是确定胎儿下腔静脉内的血流速度波形模式，并将这些波形与三尖瓣和脐动脉波形以及妊娠早期的胎儿心率相关联。
对40例妊娠11至16周的正常胎儿记录多普勒波形。11至12周仅进行经阴道扫描，15至16周仅使用经腹扫描。
收缩期和舒张早期下腔静脉血流时间速度积分比值、该血管内反流百分比、脐动脉搏动指数以及胎儿心率与孕周呈负相关。三尖瓣波形的E波峰值和A波速度以及E/A比值与孕周呈正相关。
早期正常妊娠与心脏和心脏外水平的胎儿血流速度波形显著变化相关。
