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The significance of antepartum variable decelerations
American Journal of Obstetrics and Gynecology
|October 1, 1986
Summary
Variable decelerations during nonstress tests indicate a higher risk of fetal distress and adverse neonatal outcomes. However, the presence of accelerations or good variability is linked to positive outcomes, though not independently correlated.
Area of Science:
- Obstetrics and Gynecology
- Fetal Monitoring
- Perinatal Medicine
Background:
- Nonstress tests (NSTs) are crucial for evaluating fetal well-being.
- Variable decelerations are common fetal heart rate (FHR) patterns requiring interpretation.
- Understanding the prognostic significance of FHR patterns is vital for perinatal care.
Purpose of the Study:
- To investigate the relationship between antepartum variable decelerations and perinatal outcomes.
- To analyze the association between FHR components and variable decelerations.
- To determine the predictive value of FHR patterns in NSTs.
Main Methods:
- Retrospective review of 4886 antepartum nonstress tests.
- Defined variable decelerations as ≥3 decelerations, ≥15 bpm, lasting ≥15 seconds in 20 minutes.
- Correlated FHR patterns with neonatal outcomes and intrapartum events.
Main Results:
- Incidence of variable decelerations was 1.3%.
- Variable decelerations were associated with increased fetal distress, low Apgar scores, NICU admissions, and nuchal cord.
- Accelerations and normal variability correlated with good neonatal outcomes; absence indicated adverse outcomes.
Conclusions:
- Antepartum variable decelerations are indicators of potential adverse perinatal outcomes.
- Fetal heart rate accelerations and normal variability are positive prognostic indicators.
- While associated, accelerations and variability do not independently predict neonatal outcome in the presence of variable decelerations.