Fetal pressure gradient estimations across the ductus venosus in early pregnancy using Doppler ultrasonography

Ultrasound in Obstetrics & Gynecology : the Official Journal of the International Society of Ultrasound in Obstetrics and Gynecology
I P van SplunderJ W Wladimiroff

Abstract

Doppler ultrasonography was used to estimate the pressure gradient across the ductus venosus at 8-20 weeks of gestation. According to a cross-sectional study design, flow velocity waveform recordings were obtained from the umbilical vein and ductus venosus in 147 uncomplicated singleton pregnancies. Pressure gradients were calculated using the Bernoulli equation. The pressure gradient was estimated at 0.1-1.9 mmHg during ventricular systole and at 0-0.5 mmHg during atrial contraction. Time-averaged pressure gradients ranged between 0.1 and 1.3 mmHg. No statistically significant correlation could be established between the absence or presence of umbilical venous pulsations and estimated pressure gradient. Crude estimates of the pressure gradient across the ductus venosus can be established in the late first and early second trimester of pregnancy. The large scatter of data suggests limited accuracy of venous pressure gradient calculation in early gestation. However, it may also indicate that, in early gestation, venous hemodynamics function at very low pressures.

Citations

Jul 31, 1999·European Journal of Obstetrics, Gynecology, and Reproductive Biology·T Kiserud
Jul 1, 1999·Ultrasound in Medicine & Biology·T KiserudM A Hanson
Jul 21, 1999·Journal of Biomechanical Engineering·L R HellevikS H Eik-Nes
May 20, 1999·Acta Microbiologica Et Immunologica Hungarica·J C HorvathE Horvath

❮ Previous
Next ❯

Related Concepts

Trending Feeds

COVID-19

Coronaviruses encompass a large family of viruses that cause the common cold as well as more serious diseases, such as the ongoing outbreak of coronavirus disease 2019 (COVID-19; formally known as 2019-nCoV). Coronaviruses can spread from animals to humans; symptoms include fever, cough, shortness of breath, and breathing difficulties; in more severe cases, infection can lead to death. This feed covers recent research on COVID-19.

Blastomycosis

Blastomycosis fungal infections spread through inhaling Blastomyces dermatitidis spores. Discover the latest research on blastomycosis fungal infections here.

Nuclear Pore Complex in ALS/FTD

Alterations in nucleocytoplasmic transport, controlled by the nuclear pore complex, may be involved in the pathomechanism underlying multiple neurodegenerative diseases including Amyotrophic Lateral Sclerosis and Frontotemporal Dementia. Here is the latest research on the nuclear pore complex in ALS and FTD.

Applications of Molecular Barcoding

The concept of molecular barcoding is that each original DNA or RNA molecule is attached to a unique sequence barcode. Sequence reads having different barcodes represent different original molecules, while sequence reads having the same barcode are results of PCR duplication from one original molecule. Discover the latest research on molecular barcoding here.

Chronic Fatigue Syndrome

Chronic fatigue syndrome is a disease characterized by unexplained disabling fatigue; the pathology of which is incompletely understood. Discover the latest research on chronic fatigue syndrome here.

Evolution of Pluripotency

Pluripotency refers to the ability of a cell to develop into three primary germ cell layers of the embryo. This feed focuses on the mechanisms that underlie the evolution of pluripotency. Here is the latest research.

Position Effect Variegation

Position Effect Variagation occurs when a gene is inactivated due to its positioning near heterochromatic regions within a chromosome. Discover the latest research on Position Effect Variagation here.

STING Receptor Agonists

Stimulator of IFN genes (STING) are a group of transmembrane proteins that are involved in the induction of type I interferon that is important in the innate immune response. The stimulation of STING has been an active area of research in the treatment of cancer and infectious diseases. Here is the latest research on STING receptor agonists.

Microbicide

Microbicides are products that can be applied to vaginal or rectal mucosal surfaces with the goal of preventing, or at least significantly reducing, the transmission of sexually transmitted infections. Here is the latest research on microbicides.