IMR Press / CEOG / Volume 48 / Issue 1 / DOI: 10.31083/j.ceog.2021.01.2228
Open Access Original Research
Difference between near-field and far-field of middle cerebral artery doppler pulsatility index and peak systolic velocity: a prospective study
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1 Tepecik Training and Research Hospital, Department of Obstetrics and Gynecology, Division of Perinatology, 35170 Izmir, Turkey
*Correspondence: (Duygu Adıyaman)
Clin. Exp. Obstet. Gynecol. 2021, 48(1), 66–72;
Submitted: 17 July 2020 | Revised: 19 October 2020 | Accepted: 21 October 2020 | Published: 15 February 2021
Copyright: © 2021 The Authors. Published by IMR Press.
This is an open access article under the CC BY 4.0 license (

Objective: We purposed to investigate the difference between near-field and far-field of PI (pulsatility index) and peak systolic velocity (PSV) of the middle cerebral artery (MCA) that are important in the management of fetal growth restriction and fetal anemia. Methods: This prospective study was conducted with 130 single uncomplicated pregnancies. Doppler was applied to near-and far-field of proximal MCA while PSV and PI were recorded and compared between two sides as well as according to body mass index (BMI) and gestational weeks of participants. Results: There was no statistically significant difference between near and far-fields of MCA PI (P = 0.75). However, a statistically significant difference in PSV was observed (P = 0.03), and this was especially noticeable in women with normal BMI (P = 0.009). On the other hand, there was no difference between MCA PI or PSV in women with a BMI higher than 25. Also, no significant difference was observed between groups, which were subcategorized according to gestational weeks. Conclusions: Our data suggest that the far-field PSV values may be higher than near-field MCA PSV values; sonographers should bear in mind that while far and near-field PSV can differ, conversely MCA PI can safely be assessed from both the near and far-fields of MCA in case of technical difficulty.

Doppler ultrasound
Middle cerebral artery
Peak systolic velocity
Pulsatility index
Fig. 1.
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