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Related Experiment Videos

Computerized fetal heart rate analysis in labor.

L C Pello1, S K Rosevear, G S Dawes

  • 1Nuffield Department of Obstetrics and Gynecology, Oxford, United Kingdom.

Obstetrics and Gynecology
|October 1, 1991
PubMed
Summary
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Computerized analysis of fetal heart rate (FHR) patterns can reduce observer variation. This study found that conventional FHR attributes did not reliably predict metabolic acidemia in newborns, but epidural analgesia significantly altered FHR patterns.

Area of Science:

  • Obstetrics and Gynecology
  • Perinatal Medicine
  • Fetal Monitoring

Background:

  • Visual analysis of fetal heart rate (FHR) records is subject to high observer variation.
  • Computerized numerical analysis offers a potential solution to improve objectivity in FHR interpretation.
  • Understanding FHR patterns and their correlation with neonatal outcomes is crucial for clinical decision-making.

Purpose of the Study:

  • To evaluate the relationship between various fetal heart rate (FHR) patterns and neonatal outcomes, specifically metabolic acidemia.
  • To assess the predictive value of conventional FHR attributes in identifying adverse neonatal conditions.
  • To investigate the impact of epidural analgesia on FHR patterns and its influence on neonatal status.

Main Methods:

  • On-line recording and computerized numerical analysis of FHRs from 394 women in labor (≥37 weeks' gestation).

Related Experiment Videos

  • Correlation of FHR patterns with umbilical arterial base deficit and Apgar scores at delivery.
  • Identification and analysis of confounding variables, particularly epidural analgesia in 240 women.

    • Main Results:

    • A wide range of normal FHR patterns and variations were observed in infants without acidemia.
    • Late decelerations showed poor prognostic value.
    • Conventional FHR attributes alone or combined did not reliably predict metabolic acidemia.
    • Epidural analgesia significantly altered FHR patterns (increased FHR, reduced variation, fewer decelerations) without affecting infant condition at birth.
    • Epidural analgesia was associated with longer labors, increased operative deliveries, and a threefold higher cesarean rate.

    Conclusions:

    • Computerized FHR analysis may reduce observer variability.
    • Conventional FHR analysis is insufficient for predicting metabolic acidemia.
    • Epidural analgesia is a significant confounding factor in FHR interpretation, potentially leading to increased interventions without improving neonatal outcomes.
    • The rise in basal FHR associated with epidural analgesia may contribute to higher intervention rates.