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Uterine artery resistance index in first trimester and maternal neonatal outcome
Authors: Chhabra Shakuntala, Yadav Yojna, Borkar Pradeep
Number of views: 283
Objective: To study the uterine blood flow in early pregnancy, which might provide information
about maternal neonatal outcome. Methods: Pilot study was undertaken by measuring uterine
artery resistance index (UARI) at (10±2) weeks. Results: Of study subjects 801 primigravida
without past, present obstetric disorder, 307 (38.3%) had mean UARI above 95th centile, 494 (61.7%)
below 5th centile. Mean UARI above 95th centile of women had pregnancy problems (foetal
growth restriction, hypertensive disorders, placental abruption, oligohydramnios) compared to
below 5th centile. Of 307 women with mean UARI above 95th percentile, hypertensive disorders
occurred in 53 (17.3%) and 21 (40%) with foetal growth restriction. Of 494 with mean UARI below 5th
percentile, 30 (6.1%) developed hypertensive disorders (P<0.00006), 4 (13.3%) had FGR (P<0.00006).
Placental abruption, occurred in 37 (7.48%) and in 10 (2.02%) with mean UARI above 95th percentile
and below 5th percentile (P<0.001) respectively. There were 143 caesarean births, statistically
significantly more for foetal distress in with UARI above 95th percentile. With mean UARI above
95th centile, 296 (96.41%) had term, 11 (3.58%) preterm births. Of 67 (21.82%) caesarean births at
term, 17 (25.4%) were for foetal distress, with mean UARI below 5th centile, 487 (98.58%) had term
births. Conclusions: Women with higher UARI in first trimester had more often hypertensive
disorders, placental abruption, oligohydramnios, caesarean births and foetal distress.