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

2017 ◽  
Vol 20 (4) ◽  
pp. 155-162
Author(s):  
Jacqueline Spurway ◽  
Patricia Logan ◽  
Sok Cheon Pak ◽  
Sharon Nielsen
Keyword(s):  
Blood Flow ◽  
Umbilical Cord ◽  
Peak Velocity ◽  
Reference Ranges ◽  
Vein Diameter ◽  
Umbilical Cord Vein

Effect of compression stockings on venous blood velocity and blood flow

2010 ◽  
Vol 103 (01) ◽  
pp. 138-144 ◽  
Author(s):  
Fadi Matta ◽  
Abdo Yaekoub ◽  
Syed Ahsan ◽  
Aaref Badshah ◽  
Fahad Younas ◽  
...  
Keyword(s):  
Blood Flow ◽  
Peak Velocity ◽  
Venous Blood ◽  
Blood Velocity ◽  
Popliteal Vein ◽  
Compression Stockings ◽  
Mean Velocity ◽  
Pulsed Wave Doppler ◽  
Vein Diameter ◽  
Time Average

SummaryThe effects of graduated compression stockings (GCS) on venous blood velocity have not been established. In healthy subjects, most investigations showed no effect on blood velocity, but mixed results have been reported. In this investigation we to test the hypothesis that popliteal blood velocity is increased by properly fitted GCS. Time average peak velocity in the popliteal vein, as well as time average mean velocity, vein diameter and mean volumetric flow were measured by pulsed wave Doppler ultrasound in 25 healthy male volunteers without compression stockings and repeated with fitted thigh-length compression stockings. Measurements were obtained while supine and while sitting at rest and during ankle exercise. Thigh-length GCS did not increase popliteal vein blood velocity, diameter, or volumetric blood flow while supine or sitting, with or without ankle exercise.

Z ‐Score Reference Ranges for Umbilical Vein Diameter and Blood Flow Volume in Normal Fetuses

2021 ◽  
Author(s):  
Ling Wang ◽  
Qichang Zhou ◽  
Chunhui Zhou ◽  
Jiqing Wang ◽  
Chunlan Shi ◽  
...  
Keyword(s):  
Blood Flow ◽  
Umbilical Vein ◽  
Reference Ranges ◽  
Flow Volume ◽  
Z Score ◽  
Blood Flow Volume ◽  
Vein Diameter

Hemodynamic Analysis of Arterial Blood Flow in the Coiled Umbilical Cord

2009 ◽  
Vol 17 (3) ◽  
pp. 258-268 ◽  
Author(s):  
Aaron D. Kaplan ◽  
Ariel J. Jaffa ◽  
Ilan E. Timor ◽  
David Elad
Keyword(s):  
Blood Flow ◽  
Umbilical Cord ◽  
Arterial Blood Flow ◽  
Arterial Blood

Lack of evidence for impaired preload or Bezold-Jarisch activation during brief umbilical cord occlusions in fetal sheep

2021 ◽  
Author(s):  
Christopher A. Lear ◽  
Laura Bennet ◽  
Benjamin S. A. Lear ◽  
Jenny A. Westgate ◽  
Alistair Jan Gunn
Keyword(s):  
Blood Flow ◽  
Umbilical Cord ◽  
Cardiovascular Responses ◽  
Diastolic Filling ◽  
Fetal Sheep ◽  
Blood Flows ◽  
Rapid Fall ◽  
Filling Time ◽  
Cervical Vagotomy ◽  
Femoral Blood

Impaired cardiac preload secondary to umbilical cord occlusion (UCO) has been hypothesized to contribute to intrapartum decelerations, brief falls in fetal heart rate (FHR), through the activation of the Bezold-Jarisch reflex. This cardioprotective reflex increases parasympathetic and inhibits sympathetic outflows triggering hypotension, bradycardia and peripheral vasodilation but its potential to contribute to intrapartum decelerations has never been systematically examined. In this study we performed bilateral cervical vagotomy to remove the afferent arm and the efferent parasympathetic arm of the Bezold-Jarisch reflex. 22 chronically instrumented fetal sheep at 0.85 of gestation received vagotomy (n=7) or sham-vagotomy (control, n=15), followed by three 1-min complete UCOs separated by 4-min reperfusion periods. UCOs in control fetuses were associated with a rapid fall in FHR and reduced femoral blood flow mediated by intense femoral vasoconstriction, leading to hypertension. Vagotomy abolished the rapid fall in FHR (p<0.001), and despite reduced diastolic filling time, increased both carotid (p<0.001) and femoral (p<0.05) blood flow during UCOs, secondary to carotid vasodilation (p<0.01) and delayed femoral vasoconstriction (p<0.05). Finally, vagotomy was associated with an attenuated rise in cortical impedance during UCOs (p<0.05), consistent with improved cerebral substrate supply. In conclusion, increased carotid and femoral blood flows after vagotomy are consistent with increased left and right ventricular output, which is incompatible with the hypothesis that labor-like UCOs impair ventricular filling. Overall, the cardiovascular responses to vagotomy do not support the hypothesis that the Bezold-Jarisch reflex is activated by UCO. The Bezold-Jarisch reflex is therefore mechanistically unable to contribute to intrapartum decelerations.

scholarly journals Portal Vein Dopplerflowmetry in healthy sheep according to age

2017 ◽  
Vol 37 (10) ◽  
pp. 1172-1176 ◽  
Author(s):  
Alexandra F. Belotta ◽  
Bianca P. Santarosa ◽  
Danilo O.L. Ferreira ◽  
Sílvia M.F. Carvalho ◽  
Roberto C. Gonçalves ◽  
...  
Keyword(s):  
Blood Flow ◽  
Portal Vein ◽  
Portal Blood Flow ◽  
Portal Blood ◽  
Mean Values ◽  
Pulsed Doppler Ultrasound ◽  
Healthy Sheep ◽  
Vein Diameter ◽  
Congestion Index ◽  
Post Hoc

ABSTRACT: Pulsed Doppler ultrasound was used to evaluate portal blood flow, portal velocity and portal congestion index in 24 healthy sheep divided into groups (lambs, yearlings and ewes), according to age. Measurements were performed at the 11th right intercostal space using ideal insonation angle and uniform insonation method. Mean values obtained in each group were compared with one-way ANOVA, followed by Tukey post-hoc test. Portal velocity and portal blood flow were statistically similar between the groups (P>0.05). Mean portal velocity were 17.75; 17.13 and 16.75; while mean portal blood flow were 26.65; 31.04 and 24.32 for lambs, yearlings and ewes, respectively. Portal congestion index was statistically distinct between the groups and values for lambs, yearlings and ewes were 0.009; 0.058 and 0.09, respectively (P<0.01). Statistical differences were observed in portal vein diameter, portal vein area and portal congestion index between the groups, presumably due to influence of weight and not to age.

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