The 5-tier system of assessing fetal heart rate tracings is superior to the 3-tier system in identifying fetal acidemia.

@article{Coletta2012The5S,
  title={The 5-tier system of assessing fetal heart rate tracings is superior to the 3-tier system in identifying fetal acidemia.},
  author={Jaclyn M Coletta and Elizabeth Murphy and Zachary Rubeo and Cynthia Gyamfi-Bannerman},
  journal={American journal of obstetrics and gynecology},
  year={2012},
  volume={206 3},
  pages={226.e1-5}
}
OBJECTIVE Electronic fetal heart rate monitoring was developed to identify fetuses at risk of acidemia for intervention before adverse outcomes. Our objective was to compare the 3-tier system with a 5-tier system in evaluation of fetal acidemia. STUDY DESIGN Retrospective case-control study of patients with a fetal arterial pH <7 matched to the next birth that resulted in a pH >7.2. Tracings were categorized into 3- and 5-tier systems by a single reviewer. Sensitivities and specificities were… CONTINUE READING