Placental Pathology in Relation to Uterine Artery Doppler Findings in Pregnancies with Severe Intrauterine Growth Restriction and Abnormal Umbilical Artery Doppler Changes

Abstract

Objectives Current guidelines for diagnosis and management of early-onset intrauterine growth restriction (IUGR) rely on umbilical artery Doppler (UAD), without including uterine artery Doppler (UtAD). We hypothesized that IUGR cases with abnormal UAD but normal UtAD has a different spectrum of placental pathology compared with those with abnormal UtAD.

Study Design Retrospective review of pregnancies with sonographic evidence of IUGR and abnormal UAD prior to delivery. Cases with ≥ 1 UtAD record(s) after 18⁺⁰ weeks' gestation and placental pathology were included. Cases were stratified according to initial UtAD pulsatility index (PI) values (n = 196): normal (n = 19; PI < 95th centile for gestational age/no notching), intermediate (n = 69; PI ≥ 95th centile/no/unilateral notching) and abnormal (n = 108; PI ≥ 95th centile/bilateral notching). Pregnancy outcomes and placental pathology were compared between groups.

Results Women in the normal group delivered later than those in the abnormal group (30.1 ± 3.5 vs. 28.0 ± 3.5 weeks; mean ± standard deviation; p = 0.03). Their placentas exhibited higher rates of chronic intervillositis (15.8 vs. 0.9%; p = 0.01), chorangiosis (15.8 vs. 0.9%; p < 0.0001), and massive perivillous fibrin deposition (21.1 vs. 7.4%; p = 0.05), but had lower rates of uteroplacental vascular insufficiency (26.3 vs. 79.6%; p < 0.0001).

Conclusion Approximately 10% of pregnancies with early-onset IUGR and abnormal UAD exhibited normal UtAD waveforms. They delivered later, and their placentas exhibited unusual placental pathologies.

Keywords

placental pathology - early-onset IUGR - uterine artery Doppler - umbilical artery Doppler

^* These authors contributed equally to this work.

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