Uterine artery pulsatility index in the first trimester: assessment of intersonographer and intersampling site measurement differences

First trimester screening for pre‐eclampsia in Chinese pregnancies: case–control study

“…A follow‐up study conducted at our unit both confirmed Ridding et al. findings as well as demonstrating that UtA‐PI measurements taken by sonographers in our present study were consistent with UtA‐PI measurements 2 cm distal to the internal os by a sonographer who underwent training and mentorship at the FMF . The UtA‐PI measured by the FMF trained sonographer were respectively ≈8%, 15–17%, and 21–24% lower than those taken at the level of the internal os when measured 1, 2, and 3 cm distally .…”

“…43,44 The UtA-PI measured by the FMF trained sonographer were respectively %8%, 15-17%, and 21-24% lower than those taken at the level of the internal os when measured 1, 2, and 3 cm distally. 44 Relying on UtA-PSV > 60 cm/second to ensure measurements are taken at the level of the os and not at other locations may not be adequate. Mean UtA-PSV readings in the Ridding et al study (81 cm/second) at the 3 cm distal site were similar to the 83.6 cm/second we observed in our study.…”

“…This may also further reduce potential inter‐sonographer differences. There was a greater than 10% difference in UtA‐PIs measured using the sagittal technique by two experienced sonographers, one trained at the FMF and the other, also accredited by the FMF and with over 15 years of experience …”

“…There was a greater than 10% difference in UtA-PIs measured using the sagittal technique by two experienced sonographers, one trained at the FMF and the other, also accredited by the FMF and with over 15 years of experience. 44 One confounding factor in our cohort study was that women with previous history of PE were prescribed daily aspirin to prevent recurrence. Only 1 of the 25 women with previous history of PE developed PE, potentially explaining why the observed PE incidence rate was lower than anticipated.…”

Quality assessment of uterine artery Doppler measurement in first‐trimester combined screening for pre‐eclampsia

“…This study included a large number of patients and sonographers and confirms that measurements of UtA‐PI are reliable when measured by trained staff and following the recommended technique in the clinical setting. According to the described technique, UtA‐PI in the first trimester is ideally measured using transabdominal ultrasound, with the identification of the UtAs at the level of the internal cervical os in a parasagittal sonographic view, using a 2‐mm gate and angle < 30°. Measurements performed using a transvaginal examination may produce higher PI values, but this finding could not be reproduced in all studies.…”