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Does a nonreactive fetal heart rate pattern really mean fetal distress?
H J Odendaal1, W Steyn, G B Theron
1Department of Obstetrics and Gynaecology, Tygerberg Hospital, University of Stellenbosch, South Africa.
American Journal of Perinatology
|May 1, 1994
Summary
Poor long-term variability in fetal heart rate (FHR) patterns, both during nonstress tests and labor, is linked to poorer infant outcomes. This includes lower Apgar scores and increased rates of small for gestational age newborns, highlighting the importance of FHR monitoring.
Area of Science:
- Obstetrics and Gynecology
- Fetal Medicine
- Neonatal Outcomes
Background:
- Fetal heart rate (FHR) patterns are crucial indicators of fetal well-being.
- Nonreactive and reactive FHR patterns, distinguished by long-term variability, have varying clinical significance.
- Understanding the prognostic value of different FHR patterns is essential for timely intervention.
Purpose of the Study:
- To compare the predictive value of three distinct FHR patterns: reactive, nonreactive with good variability, and nonreactive with poor variability.
- To assess the association between these FHR patterns and neonatal outcomes, including Apgar scores, intrauterine growth retardation, and umbilical blood gas values.
- To evaluate FHR patterns from both nonstress tests and during labor.
Main Methods:
- Retrospective analysis of nonstress tests (NSTs) and intrapartum FHR tracings.
- Categorization of FHR patterns into reactive, nonreactive with good variability (≥5 beats/min), and nonreactive with poor variability (<5 beats/min).
- Comparison of outcomes: 5-minute Apgar scores, small for gestational age (SGA) status, and umbilical artery blood gas values.
Main Results:
- NSTs: Poor variability nonreactive patterns showed significantly higher rates of low 5-minute Apgar scores (24%) and SGA newborns (60.6%) compared to reactive (7.2%, 8%) and good variability (5.3%, 17.6%) patterns.
- Intrapartum: Similar trends observed, with poor variability nonreactive patterns associated with higher low Apgar scores (23%) and SGA rates (80%) versus reactive (3.5%, 8.8%) and good variability (6%, 15.6%) patterns.
- Umbilical blood gas values showed no significant differences between reactive and good variability groups; only the poor variability group had a significantly lower pH.
Conclusions:
- Fetal heart rate patterns with poor long-term variability, identified via NST or during labor, are strong predictors of adverse neonatal outcomes.
- Poor FHR variability is significantly associated with increased risk of low Apgar scores and intrauterine growth retardation (small for gestational age).
- While blood gas values were largely similar, the lower pH in the poor variability group warrants attention, underscoring the clinical relevance of FHR monitoring.