First trimester uterine artery pulsatility index in a normal pregnancy

Journal
ULTRASOUND in Obstetrics & Gynecology
Date Issued
2022-09
Author(s)
Abstract
Objectives: To determine the range of distribution of first
trimester uterine artery pulsatility index (Ut-A PI) in pregnancies
uncomplicated with pre-eclampsia (PE) and fetal growth restriction
(FGR) and to determine if there is a difference between 12+0-12+6
and 13+0-13+6 distribution.
Methods: Along with first trimester aneuploidy- screening, all
women underwent Ut-A PI measurement done by FMF protocol
(transabdominal approach, mid-sagittal cervical view, level of
internal cervical os, PSV > 60 cm/s, angle of insonation < 30◦
).
Mean PI from both uterine arteries was calculated. Women were
monitoring throughout the pregnancy. Data from pregnancies
uncomplicated with PE and/or FRG were evaluated.
Results: Total of 94 women represented data pool: 47 of them
were evaluated at 12+0-12+6 week of gestation and the rest 47 at
13+0-13+6 week of gestation. During 12+0-12+6 week of gestation
Ut-a PI ranged from 1.0 to 2.8 with mean of 1.8, median of 1.75
and IQR 0.615. Ut-a PI during 13+0-13+6 week of gestation ranged
from 0.71-2.74 with mean of 1.57, median of 1.6 and IQR 0.68.
The difference in Ut- A PI between these two intervals had p value
of 0.007.
Conclusions: In a normal i.e. a pregnancy uncomplicated with PE
and/or FGR uterine artery pulsatility index is lower in 13+ in
comparison with 12+ week of pregnancy (median of 1.6 versus the
median of 1.75) which represents a statically significant difference
(p < 0.01).
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