January 2024
American Journal of Obstetrics and Gynecology
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January 2024
American Journal of Obstetrics and Gynecology
January 2024
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1 Read
American Journal of Obstetrics and Gynecology
January 2024
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1 Read
American Journal of Obstetrics and Gynecology
January 2024
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6 Reads
American Journal of Obstetrics and Gynecology
April 2023
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40 Reads
American Journal of Obstetrics and Gynecology
Background: Anemia is a commonly diagnosed comorbidity in pregnancy that is associated with an increased risk of maternal and neonatal complications. Recent data demonstrate that maternal anemia was associated with higher umbilical artery and umbilical vein O2 content at the time of delivery. Objective: We examined the relationship between maternal anemia and electronic fetal monitoring patterns associated with fetal hypoxia. Study design: This is a secondary analysis of a prospective cohort study of singleton term deliveries with universal admission completed blood count and cord gases between 2010 and 2014. Maternal anemia was defined as hemoglobin ≤ 11.0 g/dl on admission. The primary outcome was composite high-risk Category II electronic fetal monitoring in the last 60 minutes before delivery (recurrent late and/or variable decelerations, minimal variability, tachycardia, or >1 prolonged deceleration); secondary outcomes were total deceleration area and total deceleration area > 90th percentile. Of the 8,580 patients in the original study, 8,196 were included in the analysis. Outcomes were compared between patients with and without anemia. Multivariable logistic regression was used to adjust for potentially cofounding factors including hypertensive disorders of pregnancy and induction of labor. Results: Of the 8,196 patients with admission complete blood count and fetal monitoring data, 2,672 (32.6%, 2672/8196) were anemic and 5,524 (67.4%, 5524/8196) were not. Patients with anemia were significantly less likely to have composite high-risk Category II features on electronic fetal monitoring [34.2% vs 32.0%, aRR 0.93, 95% CI 0.86-0.99]. Women with anemia also had decreased total deceleration area and were less likely to have total deceleration area >90% [18.7% vs. 16.2%, aRR 0.85, 95% CI 0.77-0.94]. Conclusion: Patients with anemia are less likely to have high-risk category II electronic fetal monitoring features associated with fetal hypoxia. This finding is consistent with the association between maternal anemia and increased umbilical cord O2 content and suggests that maternal anemia may be protective against intrapartum fetal hypoxia.
January 2023
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7 Reads
American Journal of Obstetrics and Gynecology
January 2022
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8 Reads
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2 Citations
American Journal of Obstetrics and Gynecology
January 2022
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9 Reads
American Journal of Obstetrics and Gynecology