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NCBI NIH PubMed.gov Abstract of Finland study investigating reproductive maternal risk factors of intrapartum fetal asphyxia. The study concluded that the incidence of intrapartum fetal asphyxia was 2.5%. Placental abruption, primiparity, alcohol use during pregnancy, low birth weight, preeclampsia, male fetuses, and small-for-gestational age births were independent risk factors of intrapartum asphyxia, with adjusted relative risks of 3.74, 3.10, 1.75, 1.57, 1.49, 1.48 and 1.33, respectively. Most cases of intrapartum fetal asphyxia occur in low-risk pregnancies and, therefore, risk screening in antenatal care cannot accurately predict which women will eventually need emergency care for fetal asphyxia.

Canadian study to examine the roles of clinical risk scoring, electronic fetal heart monitoring and fetal blood gas and acid-base assessement in the prediction of intrapartum fetal asphyxia in term pregnancies. The study concluded that although fetal heart rate patterns will not discriminate all asphyxial exposures, continuous fetal heart rate monitoring supplemented by fetal blood gas and acid-base assessment can be a useful fetal assessment paradigm for intrapartum fetal asphyxia

NIH, NCBI PubMed article abstract: Significance of intrapartum asphyxia for the onset of fetal brain damage