Reference ranges for time‐related analysis of ductus venosus flow velocity waveforms in singleton pregnancies

Abstract

With advancing gestational age, prolongation of the diastolic phase of DV-FVW and of the E-wave of tricuspid flow was observed, suggesting maturation of ventricular diastolic function. Time-related analysis of Doppler signals of DV-FVW may provide detailed insights into fetal cardiac function.

Time‐interval analysis of ductus venosus flow velocity waveforms in twin‐to‐twin transfusion syndrome treated with laser surgery

“…All measurements were taken by the same investigator (D.T.). The high reproducibility of these measurements has been shown in our previous study.…”

A Novel Translational Model of Percutaneous Fetoscopic Endoluminal Tracheal Occlusion - Baboons (<b><i>Papio</i></b> spp.)

“…The PI of ductus venosus blood flow in the reported experiments was higher than those reported by us for the baboons at the same gestational age [42], but similar to those published for human fetuses [31]. The uterine artery PI was higher than estimated by some authors [43], but within the range reported by others [22].…”

“…Nakagawa et al [31] reported the fetal loss in monkeys which underwent fetal surgeries to be between 6.7 and 50%, where the risk of complications was dependent on the degree of surgical manipulations [25,32]. Feitz et al [23,24] were able to establish the macaque model for endoscopic fetal manipulation of the urogenital tract, while Mattison and King [33] reported the percentage of fetal loss in macaques as high as 52.4% with major complications including maternal hemorrhage into the amniotic fluid, inability to enter the amniotic cavity, and abortion.…”

Time Interval Measurements of the Ductus Venosus During the Early Second Trimester of Pregnancy: Reference Ranges and Clinical Application

“…Nakagawa et al found that both the accelerating and decelerating periods of ventricular diastole were strongly positively correlated with advanced gestation. The different outcomes could have been due to ethnicity or the Doppler measurement technique or could have been the result of a small sample size during the early second trimester of pregnancy in the previous study …”

“…In contrast to ventricular contraction, the decelerating period of ventricular filling was significantly reduced. The changing trends in the systolic phase of the ductus venosus established in this study were in accordance with previous reports . Gallarreta et al also illustrated that the venosus acceleration time of the ductus venosus increased significantly from 22 to 26 weeks, but in the diastolic phase, the predicted directions were quite different.…”