Pokharel P, Ansari M A
Department of Radiology, Institute of Medicine, Kathmandu, Nepal.
JNMA J Nepal Med Assoc. 2017 Jan-Mar;56(205):124-131.
The ductus venosus is a small funnel shaped vessel found posterior to the fetal liver connecting the intra-abdominal umbilical vein and the inferior vena cava. It is one of the three physiological shunts in the fetus. The main objective of this study is to construct the reference table and normogram for fetal ductus venosus Pulsatility Index and diameter with gestational age.
This was a prospective cross sectional study conducted during August 2011 to July 2012 taking 294 uncomplicated pregnancies using systemic random sampling method. Three measurements were made for ductus venosus diameter and Pulsatility Index in each fetus during period of fetal quiescence.
The ductus venosus diameter at <20weeks, 20-25 weeks, 25-30 weeks, >30 weeks were 1.16, 1.31, 1.62, 1.81 and Pulsatility Index at <20weeks, 20-25 weeks, 25-30 weeks, >30 weeks were 0.41, 0.44, 0.41 and 0.41 respectively.
The mean diameter of the ductus venosus was linear across gestational age. The Pulsatility Index shows a scattered distribution across the gestational age.
静脉导管是位于胎儿肝脏后方的一个小漏斗状血管，连接腹内脐静脉和下腔静脉。它是胎儿体内三种生理性分流之一。本研究的主要目的是构建胎儿静脉导管搏动指数和直径随孕周变化的参考表和正态图。
这是一项前瞻性横断面研究，于2011年8月至2012年7月进行，采用系统随机抽样方法选取294例无并发症的妊娠病例。在胎儿安静期，对每个胎儿的静脉导管直径和搏动指数进行三次测量。
孕周<20周、20 - 25周、25 - 30周、>30周时静脉导管直径分别为1.16、1.31、1.62、1.81，孕周<20周、20 - 25周、25 - 30周、>30周时搏动指数分别为0.41、0.44、0.41和0.41。
静脉导管的平均直径随孕周呈线性变化。搏动指数在整个孕周范围内呈离散分布。
