van Splunder I P, Wladimiroff J W
Department of Obstetrics and Gynaecology, Academic Hospital Rotterdam-Dijkzigt, Erasmus University, The Netherlands.
Br J Hosp Med. 1995;53(11):559-62.
Recent studies using combined transvaginal and transabdominal Doppler ultrasonography have demonstrated that fetal venous, cardiac and arterial flow velocity waveforms can be recorded as early as the late first trimester of pregnancy. Marked changes at all three levels have been described. An overview of the early fetal circulation is presented.
最近使用经阴道和经腹部联合多普勒超声检查的研究表明，早在妊娠早期晚期就能记录到胎儿静脉、心脏和动脉的血流速度波形。已经描述了这三个层面的显著变化。本文对早期胎儿循环进行了概述。
