Adapted ST analysis during labor: relative versus absolute ST events, a case-control study.
Alexandra D J Hulsenboom1,2, Daisy A A van der Woude1, Martina M Porath1
1Department of Obstetrics and Gynecology, Máxima Medical Center, Veldhoven, The Netherlands.
Summary
Relative ST analysis shows promise for improving fetal acidemia detection during labor compared to absolute ST analysis. Further research in larger studies is recommended to confirm these findings and enhance diagnostic accuracy.
Area of Science:
- Obstetrics and Gynecology
- Fetal Monitoring
- Cardiology
Background:
- The effectiveness of ST analysis of the fetal electrocardiogram (ECG) in reducing fetal asphyxia and cesarean section rates remains unclear.
- Physiological variations in fetal heart electrical axis can lead to false alarms in conventional (absolute) ST analysis.
- Relative ST analysis, which accounts for these variations, may offer improved diagnostic accuracy.
Purpose of the Study:
- To compare the diagnostic accuracy of absolute ST analysis versus relative ST analysis in identifying fetal acidemia.
- To evaluate the utility of relative ST analysis in overcoming limitations of conventional ST analysis.
Main Methods:
- A retrospective case-control study was conducted.
- Twenty healthy women were monitored during labor, with 10 cases (umbilical cord artery pH < 7.05) and 10 controls (pH > 7.20).
- Sensitivity, specificity, positive and negative likelihood ratios were calculated for both absolute and relative ST analysis.
Main Results:
- Relative ST analysis demonstrated higher sensitivity (90% vs. 70%) and specificity (100% vs. 70%) compared to absolute ST analysis.
- Positive likelihood ratios were significantly higher (infinity vs. 2.3) and negative likelihood ratios lower (0.1 vs. 0.4) for relative ST analysis.
- While trends favored relative ST analysis, McNemar's test showed no statistically significant difference in sensitivity and specificity between the two methods in this small cohort.
Conclusions:
- Relative ST analysis exhibited improved diagnostic indicators, including higher positive and lower negative likelihood ratios, compared to absolute ST analysis.
- Despite promising trends, this small study did not find a statistically significant difference between the methods.
- Larger studies are warranted to further investigate the potential of relative ST analysis in fetal monitoring.
Keywords:
Diagnostic accuracyST eventT/QRSfetal electrocardiographyfetal monitoringmetabolic acidosisMore Related Videos
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