Application Of Fetal Oxygen Saturation In Intrapartum Fetal Monitoring

Objective The clinical efficience and safety of mtrapartum fetal oxygen (FSaO₂) monitoring were studied in order to explore reasonable route of diagnosis of fetal acidosis by combining FSaO₂ monitoring system and electronic fetal monitoring (EFM).Methods Continuous fetal oxygen saturation rate combining with external EFM was monitored at 50 term fetuses during all of stage. The two monitoring methods were validated with standard sensitivity , specificity, positive predictive value, negative predictive value and accuracy on the bases of Apgar score and cord artery blood gases analysis results.Results(1) Fetal oxygen saturation rate was significantly correlated with PH, PO₂, PCO₂ and BE of cord artery blood gases. There was linear regression between fetal oxygen saturation rate and cord artery blood PH.(2) With a 30% cutoff, predicting fetal acidosis of using fetal oxygen saturation monitoring system was more accurate than that of using external FHR monitoring. Standard sensitivity was 83.3%, specificity was 93.8%, positive predict value was 76.9%, negative predict value was 95.7% and accuracy was 91.7%.Conclusion(1) FSaO₂ monitoring is an efficient diagnostic method of fetal acidosis.