Murakami M, Kanzaki T, Utsu M, Chiba Y
Nihon Sanka Fujinka Gakkai Zasshi. 1985 May;37(5):776-82.
In the present study, we intended to depict the changes occurring during labor in the fetal umbilical blood flow. Simultaneously, we also investigated the characteristics of the changes and their relation to the fetal heart rate patterns. In 15 human labors, the blood flow velocity in the intra-abdominal part of the umbilical vein was recorded continuously by the pulsed Doppler ultrasound technique. At the same time, direct fetal ECG and uterine contraction were monitored. The umbilical venous blood flow during the uterine contraction was equal to or lower than that between the uterine contractions. The maximum umbilical blood flow was decreased by 50% or more at variable deceleration and reduction of the umbilical venous blood flow was followed by a decrease in heart rate. Otherwise at late deceleration, the umbilical venous blood flow reduction was not so marked and biphasic pulsation became evident following the heart rate decrease. The present study has revealed that the umbilical venous blood flow shows characteristic patterns at variable deceleration and late deceleration.
在本研究中，我们旨在描绘胎儿分娩过程中脐血流的变化情况。同时，我们还研究了这些变化的特征及其与胎儿心率模式的关系。在15例人类分娩过程中，采用脉冲多普勒超声技术连续记录脐静脉腹腔内部的血流速度。与此同时，对胎儿直接心电图和子宫收缩进行监测。子宫收缩期间的脐静脉血流等于或低于子宫收缩之间的血流。在变异减速时，脐血流最大值降低50%或更多，且脐静脉血流减少后心率随之下降。否则在晚期减速时，脐静脉血流减少并不明显，心率下降后双相搏动变得明显。本研究表明，脐静脉血流在变异减速和晚期减速时呈现出特征性模式。
