Fetal heart rate (FHR) tracings are classified into 3 categories per the National Institute of Child Health and Human Development guidelines. There exists broad consensus on the recognition and management of categories I and III. However, a category II FHR tracing is considered “indeterminate” and cannot be classified as either reassuring or non-reassuring. Absence of variability and high frequency and increased depth of decelerations are the key determining factors that make a category II tracing non-reassuring and are associated with fetal metabolic acidosis. Periodic category II tracing is present in the majority of normal laboring patients. In the setting of a category II tracing, an initial attempt should be made for in utero resuscitation of the fetus. If the tracing fails to improve over a period of 1 to 2 hours, or the fetal tracing gradually deteriorates, a decision should be made for operative vaginal or cesarean delivery. Category II tracing management algorithms can aid in decision-making in this uncertain clinical scenario. Team training and simulation may improve team performance and have a positive impact on neonatal outcomes.
Fetal Heart Rate Tracing Category II: A Broad Category in Need of Stratification
Drs Shilkrut, Hsu, and Fuks have disclosed no financial relationships relevant to this article. This commentary does not contain a discussion of an unapproved/investigative use of a commercial product/device.
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Alexander G. Shilkrut, Richard C. Hsu, Aleksandr M. Fuks; Fetal Heart Rate Tracing Category II: A Broad Category in Need of Stratification. Neoreviews February 2021; 22 (2): e88–e94. https://doi.org/10.1542/neo.22-2-e88
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