o_1977r8vv9vk1ts2ms0kd8pksa.pdf

a Chapter 16 Doppler Velocimetry of the Uteroplacental Circulation 239
Fig. 16.16. Spiral (left), right
uterine (top right), and left
uterine (bottom right) artery
velocity waveforms in a preeclamptic
woman at 31 weeks'
gestation. The right lateral placentation
resulted in divergent
uterine velocity waveforms,
with the right uterine artery
circulation much more compliant
than that on the left
R.I.
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
Nonplacental Arcuate
n = 614, mean
5th and 95th confidence intervals
0.2
0.1
16 18 20 22 24 26
Gestation
R.I.
Placental Arcuate
n = 614, mean
1.0
5th and 95th confidence intervals
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
16 18 20 22 24 26
Gestation
Fig. 16.17. Reference ranes of
the uterine and arcuate resistance
index, demonstrating
the effect of placental site.
(Reprinted from [34] with permission)
R.I.
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
Nonplacental Uterine
n = 618, mean
5th and 95th confidence intervals
16 18 20 22 24 26
Gestation
R.I.
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
Placental Uterine
n = 618, mean
5th and 95th confidence intervals
0.2
0.1
16 18 20 22 24 26
Gestation