Ultrasound Clinical Trial
Official title:
Clinical Utility of Uterine, Fetal Cerebral Doppler and Oligohydramnios to Predict Abnormal Heart Rate Tracings in Pregnancies at or Beyond 41 Weeks
Objective: To estimate the value of uterine, fetal cerebral Doppler and oligohydramnios to predict abnormal fetal heart rate tracings in pregnancies at or beyond 41 weeks
This will be a nested case-control study that was conducted at University Hospital Dr. Jose
E. Gonzalez after the approval of Institutional ethical committee. Women with low risk late
term or postterm pregnancy (at least 41 weeks) with confirm gestational age who will be
referred to our Maternal-fetal unit and admitted 1 to 2 days prior to induction of labour
according institutional protocol will be recruited and constitute the cohort.
Cases will be patients with abnormal intrapartum cardiotocogram (category III fetal heart
rate tracing). For each case, four controls will be matched. The primary outcome will be to
obtain odds ratios for the Doppler parameters (middle cerebral artery pulsatility index, mean
uterine artery pulsatility index and Middle cerebral artery pulsatility index to mean uterine
artery pulsatility index ratio) and amniotic fluid index that would be associated with
intrapartum category III fetal heart rate tracing.
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