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Lack of relationship between variable decelerations during reactive nonstress tests and oligohydramnios
1Department of Obstetrics and Gynecology, University of Rochester School of Medicine and Dentistry, New York 14642, USA.
American Journal of Perinatology
|June 21, 2001
Summary
Variable decelerations on nonstress tests do not predict low amniotic fluid volume. These decelerations were not associated with oligohydramnios or adverse perinatal outcomes in this study.
Area of Science:
- Obstetrics
- Fetal Monitoring
- Perinatal Medicine
Background:
- Nonstress tests (NSTs) are commonly used to assess fetal well-being.
- Interpretation of specific fetal heart rate patterns, such as variable and lambda decelerations, requires further clarification regarding their predictive value.
Purpose of the Study:
- To prospectively evaluate the predictive value of variable and lambda decelerations on reactive nonstress tests for oligohydramnios and perinatal outcomes.
Main Methods:
- Prospective study involving 651 women undergoing reactive nonstress tests and same-day amniotic fluid index (AFI) ultrasound.
- Categorization into Group 1 (with variable decelerations) and Group 2 (without variable decelerations).
- Comparison of demographic, perinatal outcome, and AFI data between groups.
Main Results:
- No significant difference in oligohydramnios rates between groups (14.5% vs. 13.3%).
- Variable decelerations did not correlate with AFI, even in cases of oligohydramnios (AFI <8 cm).
- Variable decelerations were associated with intrapartum fetal distress, but lambda decelerations showed no correlation with outcomes.
Conclusions:
- Variable decelerations on a reactive nonstress test do not reliably predict amniotic fluid volume.
- These decelerations, in the context of a reactive NST, did not warrant intervention in this study.
- Lambda decelerations did not correlate with any assessed perinatal outcomes.