EVALUATING THE PREDICTIVE EFFICACY OF FIRST-TRIMESTER UTERINE ARTERY DOPPLER IN IDENTIFYING ADVERSE PREGNANCY OUTCOMES
Main Article Content
Keywords
Uterine artery Doppler, Pulsatility Index, Pre-eclampsia, Fetal Growth Restriction, First trimester screening, Pregnancy outcomes
Abstract
Background: Early identification of high-risk pregnancies is essential to reduce maternal and fetal morbidity and mortality. Pre-eclampsia (PE) and fetal growth restriction (FGR) are major contributors to adverse outcomes and are often linked to impaired placentation. First-trimester uterine artery Doppler ultrasonography provides a non-invasive assessment of uteroplacental perfusion and may serve as a useful screening tool.
Objective: To evaluate the predictive value of first-trimester uterine artery Doppler parameters—particularly Pulsatility Index (PI) and early diastolic notch—in forecasting adverse pregnancy outcomes including PE, FGR, low birth weight (LBW), preterm delivery, and oligohydramnios.
Methods: A prospective cohort study was conducted on 121 antenatal women between 11 and 13+6 weeks of gestation. Uterine artery Doppler was performed to measure PI and detect early diastolic notching. Participants were followed until delivery, and pregnancy outcomes were documented. Diagnostic performance was assessed using sensitivity, specificity, positive predictive value (PPV), negative predictive value (NPV), likelihood ratios, and Youden Index.
Results: Elevated PI (>2.4) was observed in 26.4% of participants; early diastolic notch was detected in 2.5%. Adverse outcomes occurred in 19.8% of cases, with PE in 12.4%, FGR in 6.6%, LBW in 13.2%, preterm delivery in 12.4%, and oligohydramnios in 8.3%. PI >2.59 predicted PE with 60% sensitivity and 85.8% specificity. PI >2.22 predicted FGR with 100% sensitivity and 63.7% specificity. The highest Youden Index was observed for FGR (0.64) and oligohydramnios (0.51). The presence of early diastolic notch was significantly associated with FGR, LBW, and preterm birth.
Conclusion: First-trimester uterine artery Doppler is a valuable screening modality for predicting adverse pregnancy outcomes, particularly placenta-mediated disorders such as PE and FGR. Elevated PI and early diastolic notch are reliable indicators of impaired placentation and should be integrated into routine antenatal screening protocols to enhance early risk stratification, especially in resource-limited settings.
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