Umbilical vein vasomotion detected<i>in vivo</i>by serial three-dimensional pixelwise spatially angle-corrected volume flow measurements

Scholbach, Thomas; Heien, C.; Eggebø, Torbjørn Moe

doi:10.1002/uog.14890

Cited by 2 publications

(1 citation statement)

References 24 publications

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“…6 The umbilical vein velocity has been reported to be persistently lower in FGR fetuses, with the trend evident in both longitudinal and cross-sectional studies, in all sample sizes and across a range of gestational ages. 5,8,[11][12][13][14] Umbilical vein blood flow has been investigated since the 1980s, with many researchers finding a reduction in blood flow in the presence of FGR 5,8,11,12,[15][16][17][18][19][20] and some concluding that reduced blood flow was present prior to other ultrasound changes associated with FGR. 12,21 The aim of this research was to measure the diameter, PV and calculate the Q ucv of the intra-amniotic umbilical cord vein between the gestational ages of 16-42 weeks and establish reference ranges for each parameter using quantile regression.…”

Section: Introductionmentioning

confidence: 99%

Reference ranges for the intra‐amniotic umbilical cord vein diameter, peak velocity and blood flow in a regional NSW population

Spurway

Logan

Pak

et al. 2017

Australas J Ultrason Med

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Aim: To construct gestational age (GA)-related reference ranges of the intra-amniotic umbilical cord vein (UCV) diameter, peak velocity (PV) and blood flow (Qucv) using a Central West New South Wales population. Materials and Methods: This was a prospective, quasi-experimental study of low risk, singleton pregnancies (n = 321) between 16 and 42 weeks of gestation. Participation was voluntary following informed consent. The UCV diameter and PV were measured using B mode and duplex Doppler respectively, and Qucv calculated. Percentile values and reference range graphs were established using quantile regression modelling in R statistical software. Intraclass correlation coefficients (ICCs) were calculated to assess the intra and intersonographer reliability. Results: Reference ranges for the UCV diameter, PV and Qucv were established and graphed. All three UCV measurements increased with advancing GA, with both diameter and Qucv exhibiting a decline in the late third trimester. The intrasonographer and intersonographer ICCs for the UCV diameter and PV showed almost perfect agreement within and between sonographers. Conclusion: Gestational age-related reference ranges for the UCV diameter, PV and Qucv were developed using quantile regression from a cohort of low risk, singleton pregnancies in Central West NSW. These reference ranges have the potential to assist in the diagnosis and monitoring of fetal growth restriction.

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Section: Introductionmentioning

confidence: 99%

Reference ranges for the intra‐amniotic umbilical cord vein diameter, peak velocity and blood flow in a regional NSW population

Spurway

Logan

Pak

et al. 2017

Australas J Ultrason Med

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Correlation Between Fetal Weight Gain and Birth Weight with Blood Flow in the Uterine Arteries Calculated with the PixelFlux Technique

Arneberg

Andersen

Lorås

et al. 2018

Ultrasound Int Open

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Introduction The aim was to investigate correlations between fetal weight gain/day and birthweight with blood flow estimates in the uterine arteries calculated with the PixelFlux technique and with measurements from TAmax. We also aimed to examine the agreement between estimates using the two methods. Material and methods We conducted a prospective observational pilot study in pregnancy week 24–25 in women with risk pregnancies referred to the fetal medical centre at St. Olavs Hospital, Trondheim, Norway from March 2016 to June 2016. Blood flow in the uterine arteries was calculated using time-averaged peak velocity (TAmax) and the PixelFlux technique. PixelFlux is a method based on pixelwise calculation of spatially angle-corrected velocities and areas of all pixels inside a vessel during a heart cycle. Results The mean flow calculated from PixelFlux and TAmax was 811 ml/minute and 787 ml/minute, respectively. The intra-class correlation coefficient was 0.83 (95% CI 0.72-0.90) and limits of agreement were −441 ml/minute (95% CI -558 to −324 ml/minute) to 489 ml/minute (95% CI 372 to 606 ml/minute). We observed a significant correlation between mean flow calculated from PixelFlux and birthweight (r=0.41; p<0.01) and between flow calculated from PixelFlux and weight gain/day (r=0.33; p=0.02). Calculation based on TAmax was significant correlated to birthweight (r=0.34; p=0.02), but not to weight-gain/day. Pulsatile index was not correlated to flow, birthweight or fetal weight-gain/day. Conclusions We found significant correlations between estimated blood flow in the uterine arteries using the PixelFlux technique with fetal weight-gain/day and with birthweight. Estimates from two methods showed good agreement.

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Umbilical vein vasomotion detectedin vivoby serial three-dimensional pixelwise spatially angle-corrected volume flow measurements

Abstract: ABSTRACT

Cited by 2 publications

References 24 publications

Reference ranges for the intra‐amniotic umbilical cord vein diameter, peak velocity and blood flow in a regional NSW population

Reference ranges for the intra‐amniotic umbilical cord vein diameter, peak velocity and blood flow in a regional NSW population

Correlation Between Fetal Weight Gain and Birth Weight with Blood Flow in the Uterine Arteries Calculated with the PixelFlux Technique

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