Doppler-derived umbilical artery absolute velocities and their relationship to fetoplacental volume blood flow: a longitudinal study

2005 ◽  
Vol 25 (5) ◽  
pp. 444-453 ◽  
Author(s):  
G. Acharya ◽  
T. Wilsgaard ◽  
G. K. R. Berntsen ◽  
J. M. Maltau ◽  
T. Kiserud
Keyword(s):  
Blood Flow ◽  
Longitudinal Study ◽  
Umbilical Artery ◽  
Volume Blood ◽  
Volume Blood Flow

scholarly journals Volume blood flow‐based indices of fetal brain sparing in the second half of pregnancy: A longitudinal study

2020 ◽  
Vol 99 (12) ◽  
pp. 1717-1727
Author(s):  
Maria Stefopoulou ◽  
Jonas Johnson ◽  
Tom Wilsgaard ◽  
Peter Lindgren ◽  
Lotta Herling ◽  
...  
Keyword(s):  
Blood Flow ◽  
Longitudinal Study ◽  
Fetal Brain ◽  
Volume Blood ◽  
Volume Blood Flow

Relationships among Doppler-derived umbilical artery absolute velocities, cardiac function, and placental volume blood flow and resistance in fetal sheep

2004 ◽  
Vol 286 (4) ◽  
pp. H1266-H1272 ◽  
Author(s):  
Ganesh Acharya ◽  
Tiina Erkinaro ◽  
Kaarin Mäkikallio ◽  
Tomi Lappalainen ◽  
Juha Rasanen
Keyword(s):  
Blood Flow ◽  
Doppler Ultrasonography ◽  
Umbilical Artery ◽  
Fetal Sheep ◽  
Arterial Blood ◽  
Blood Pressures ◽  
Volume Blood ◽  
Volume Blood Flow ◽  
Blood Flow Velocities ◽  
Placental Volume

We hypothesized that umbilical artery (UA) absolute blood flow velocities measured by Doppler ultrasonography reflect placental volume blood flow (QUA) and placental vascular resistance ( RUA) in a late gestation fetal sheep model. In addition, we examined the relationships between umbilical artery absolute blood flow velocities and parameters of fetal cardiac function. Twenty-six sheep fetuses were instrumented at 112–132 days of gestation. After a 5-day recovery period, experiments were performed under general anesthesia in 16 normal fetuses, in 5 fetuses after maternal administration of phenylephrine, and in 5 fetuses after placental embolization. The QUA and arterial blood pressures were measured using a transit-time ultrasonic flow probe and a catheter placed into the descending aorta, respectively. UA peak systolic velocity (PSV), end-diastolic velocity (EDV), time-averaged maximum velocity (TAMXV), pulsatility index (PI), mean velocity ( Vmean), fetal cardiac output, ventricular ejection forces, and the proportion of isovolumetric relaxation time (IRT%) in the cardiac cycle were measured with the use of Doppler ultrasonography. Significant positive linear correlations were found between UA EDV, TAMXV, and Vmean versus QUA, whereas UA PI had a significant negative correlation with QUA. Significant negative correlations were shown between UA EDV, TAMXV, and Vmean versus RUA. A significant positive correlation was present between UA PI and RUA. Doppler-derived UA parameters did not correlate with fetal arterial blood pressures, cardiac output, ventricular ejection forces or IRT%. In fetal sheep, Doppler-derived UA PI and absolute velocities, except PSV, are closely related to directly measured QUA and RUA, validating the use of noninvasive Doppler velocimetry in the assessment of placental circulation.

Quantification of Volume Blood Flow

1972 ◽  
Vol 7 (5) ◽  
pp. 390-395
Author(s):  
Charles A. Braak ◽  
James C. Stanley ◽  
Joseph J. Bookstein
Keyword(s):  
Blood Flow ◽  
Volume Blood ◽  
Volume Blood Flow

scholarly journals The Effects of Changes in PaCO2Cerebral Blood Volume, Blood Flow, and Vascular Mean Transit Time

Stroke ◽  
1974 ◽  
Vol 5 (5) ◽  
pp. 630-639 ◽  
Author(s):  
ROBERT L. GRUBB ◽  
MARCUS E. RAICHLE ◽  
JOHN O. EICHLING ◽  
MICHEL M. TER-POGOSSIAN
Keyword(s):  
Blood Flow ◽  
Blood Volume ◽  
Transit Time ◽  
Mean Transit Time ◽  
Volume Blood ◽  
Volume Blood Flow
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