Physicians' subjectivity in evaluating oxytocin challenge tests

Area of Science:

• Obstetrics and Gynecology
• Maternal-Fetal Medicine
• Fetal Monitoring

Background:

• The oxytocin challenge test (OCT) is used to assess fetal well-being.
• Evaluating fetal heart rate (FHR) patterns is crucial for antepartum monitoring.
• Inter-observer variability in interpreting FHR tests can impact clinical decisions.

Purpose of the Study:

• To assess inter-observer agreement among maternal-fetal medicine specialists on OCT interpretation.
• To evaluate the correlation between OCT results, FHR reactivity, and neonatal outcomes.
• To identify the most significant variable in antepartum FHR monitoring for predicting neonatal outcome.

Main Methods:

• Five maternal-fetal medicine physicians independently reviewed 50 OCTs.
• Physicians assessed OCT results and FHR reactivity patterns.
• Neonatal outcomes were correlated with the physicians' interpretations.

Main Results:

• Considerable disagreement was observed among physicians regarding OCT interpretation (average agreement: 52%).
• Significant disagreement also occurred in evaluating FHR reactivity patterns.
• Majority agreement (≥3/5 physicians) on OCT or reactivity showed reasonable correlation with neonatal outcome.
• FHR accelerations, irrespective of OCT results, demonstrated a strong correlation with neonatal outcomes.

Conclusions:

• There is substantial inter-observer variability in interpreting OCTs and FHR reactivity.
• The presence or absence of FHR accelerations is a highly significant predictor of neonatal outcome.
• FHR acceleration patterns are the most critical variable in antepartum fetal heart rate monitoring.