Uterine Artery Resistance Index above 95 Percentile : Pre
valence and Adverse Perinatal Outcome Prediction in Preg
nancies Complicated by Hypertensive Disorders
PORNPIMOL RUANGVUTILERT, MD, PhD*,
ANUWAT SUTANTA WIBUL, MD*,
PRASERT SUNSANEEVITHA YAKUL, MD*,
DITTAKARN BORIBOONHIRUNSARN, MD, MPH, PhD**
Affiliation : * Division of Maternal Fetal Medicine,
** Division of Epidemiology, Department of Obstetrics and Gynecology, Faculty of Medicine Siriraj Hospital, Mahidol
University, Bangkok 10700, Thailand.
AbstractUterine artery resistance index (UARI) was determined in a cohort of pregnant women com
plicated by a hypertensive disorder. The prevalence of the value above 95 percentile (UARI95) and its
prediction of adverse perinatal outcomes were evaluated. Fifty-eight women were included in the study.
The prevalence of UARI95 in this group of women was 27.6 per cent. The correlations between mean
UARI95 and ad verse perinatal outcomes were: 31.6 per cent sensitivity, 74.4 per cent specificity, with
only 60.3 per cent accuracy. The mean UARI95 does not qualify as a reliable screening test for adverse
perinatal outcomes in pregnancies complicated by hypertensive disorders.
Keywords : Uterine Artery Resistance Index, Gestational Hypertension, Hypertensive Disorder, Doppler
Ultrasonography
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