ductus venosus


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ductus venosus

[′dək·təs ve′nō·səs]
(embryology)
Blood shunt between the left umbilical vein and the right sinus venosus of the heart in the mammalian embryo.
References in periodicals archive ?
The role of ductus venosus blood flow assessment in screening for chromosomal abnormalities at 10-16 weeks of gestation.
Investigations continue exploring additional ultrasound parameters for DS risk assessment, (21) Recent studies have found that blood flow through the fetal Ductus Venosus (19,20), fetal tricuspid regurgitation, and the frontomaxillary facial angles (22) are all promising.
The imbalance in blood flow exchange between the co-twins' circulations--again, the primary contributor to the development of TTTS--also can be examined using Doppler assessments of two additional vascular beds: the middle cerebral artery (MCA) and the ductus venosus.
Techniques used to evaluate risk for Down syndrome during the first trimester include nuchal translucency (NT) sonography, assay of first-trimester maternal serum markers, nasal bone sonography, and Doppler sonography of the ductus venosus.
4) At 10 to 14 weeks' gestation, the ductus venosus vessel may be as small as 2 mm while the Doppler gate size may be 0.
Ductus venosus studies in fetuses at high risk for chromosomal or heart abnormalities: Relationship with nuchal translucency measurement and fetal outcome.
The prevalence of an abnormal A-wave in the ductus venosus in fetuses without major cardiac defects increased with fetal NT thickness, but in those with cardiac defects, it did not change significantly with NT thickness," Dr.
Whereas experts are able to obtain tricuspid and ductus venosus Doppler recordings from a 12-week fetus in less than a minute, the learning curve for beginners is long and arduous," he said.
All outcomes increased significantly with umbilical artery reversal, abnormal ductus venosus and umbilical vein Doppler, and abnormal biophysical parameters, Dr.
Absent ductus venosus atrial systole (a-wave), umbilical vein pulsations, loss of movement, and oligohydramnios were the strongest predictors of stillbirth and acidemia.
When a fetus senses it's receiving less oxygen, it dilates the ductus venosus to shunt the best-oxygenated blood to the heart and brain.
Reverse diastolic flow in the ductus venosus or inferior vena cava reflects a stiff heart unable to pump properly.