(Abstracted from JAMA Pediatr 2018;172(9):818–823)
Category II fetal heart tracings are defined by the National Institute of Child Health and Human Development as a broad class of electronic fetal monitoring observed in more than 80% of laboring patients. This categorization does not necessarily predict neonatal acidemia, but the presence of category II fetal heart tracings often results in intrauterine resuscitation efforts aimed at improving fetal oxygenation.
Department of Obstetrics and Gynecology, Washington University School of Medicine in St Louis, St Louis, MO (N.R., L.W., C.W., G.A.M., M.G.T., A.G.C.); and Department of Obstetrics and Gynecology, Carolinas Medical Center, Charlotte, NC (L.A.T.)