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Does an amniotic fluid index of </=5 cm necessitate delivery in high-risk pregnancies? A case-control study
E F Magann1, M J Kinsella, S P Chauhan
1Department of Obstetrics and Gynecology, Naval Medical Center, Medical College of Georgia, University of Mississippi Medical Center, Jackson, USA.
Objective:
This study was undertaken to determine whether women with high-risk pregnancies and an amniotic fluid index of =5 cm require labor induction to prevent adverse perinatal outcomes.
Study Design:
All women at high risk at >/=34 weeks' gestation with an amniotic fluid index of =5 cm were admitted to the hospital for labor induction. Each woman was compared with the next patient at high risk seen with an amniotic fluid index of >5 cm and the same pregnancy complication. Case patients were also matched with control subjects for maternal race, age, parity, and gestational age.
Results:
Prospectively, 79 women at high risk with an amniotic fluid index of =5 cm were compared with 79 control subjects. There were no statistically significant differences between the 2 groups in the risks of thick meconium (P =.29), variable decelerations (moderate P =.27, severe P =.37), amnioinfusion (P =.37), cesarean delivery for fetal distress (P =.4), and umbilical artery pH <7.10 (P =.29).
Conclusion:
High-risk pregnancies with an amniotic fluid index of =5 cm appear to carry intrapartum complication rates similar to those of similar high-risk pregnancies with an amniotic fluid index of >5.