Nandini Raghuraman’s research while affiliated with Washington University in St. Louis and other places

Objective Untreated opioid use disorder (OUD) is associated with significant morbidity in pregnancy. Recent reports have highlighted the rise of xylazine in the nonprescribed fentanyl supply. The frequency with which pregnant people with OUD are exposed to xylazine has not been characterized. We sought to describe the rate of xylazine detection in urine drug screens (UDS) from pregnant people admitted to a labor unit. Methods We performed a cross sectional study of all UDS results from an inpatient obstetric unit at an urban tertiary care center from December 2022, when xylazine was added to the detection panel, through July 2023. We perform universal verbal drug screening, with subsequent urine drug screening only performed after a positive verbal screen and consent. The trend of opioid-positive urine drug screens also positive for xylazine from December to July was measured with the Cochran-Armitage test. Results Of 5662 people admitted to Labor and Delivery during the study period, 138 UDS were sent for 123 unique individuals. Ninety-eight (71%) of UDS were positive for nonprescribed substances. Of positive UDS, 36 (37%) were positive for nonprescribed opioids, and of these, 17 (47.2%) were positive for xylazine among 14 pregnant people. The trend of UDS positive for opioids that were also positive for xylazine increased significantly over time ( P = 0.030), from 0% in December 2022 to 100% in July 2023. Conclusions Over 8 months, xylazine positivity significantly increased in UDSs positive for nonprescribed opioids in an urban Midwestern hospital. These results underscore the critical need to study the impact of xylazine on obstetric outcomes.

Objective The American College of Obstetricians and Gynecologists recommends speculum exams, rather than digital exams, for evaluation of the cervix after preterm prelabor rupture of membranes (PPROM). However, in clinical practice, digital exams may be necessary. We examined whether increasing numbers of digital exams were associated with adverse outcomes in PPROM. Study Design This was a single-center retrospective cohort study of patients admitted between 2019 and 2021 with PPROM at 24 to 34 weeks of gestation. The primary outcome was intra-amniotic infection and inflammation (triple I), compared between patients who had ≤1 or ≥2 digital exams during expectant management of PPROM. Secondary outcomes included latency, antepartum events, and other maternal and neonatal morbidities. Groups were compared using univariate analysis and Cox proportional hazards model to account for time between admission and delivery and potential confounders. Results Of 125 patients included in the analysis, 46 (36.8%) had ≤ 1 and 79 (63.2%) had ≥2 digital exams. There was no significant difference in triple I between groups (adjusted hazard ratio [aHR]: 1.03, 95% confidence interval [CI]: 0.47, 2.26). There were no significant differences in composite maternal or neonatal morbidities or latency from admission to delivery between groups (8 days [interquartile range (IQR): 3, 14] vs. 6 days [IQR: 3, 12]). There was a higher rate of spontaneous labor as the indication for delivery in the group with ≥2 exams (aHR: 2.07, 95% CI: 1.04, 4.11). Conclusion In this retrospective cohort study, ≥2 digital exams during expectant management of PPROM was not associated with change in infectious morbidity or pregnancy latency. There was an increase in spontaneous labor in the group with more digital exams; this may be due to confounding by indication, as patients who are in prodromal labor are more likely to receive digital exams. These results suggest equipoise in exam type in the management of PPROM. Key Points

Objective We sought to assess the impact of a prolonged latent phase (PLP) on maternal and neonatal morbidity. Study Design This is a secondary analysis of a prospective cohort study conducted 2010 to 2015 that included all term gravidas who reached active labor (6 cm). Primary outcomes were composite maternal morbidity (maternal fever, postpartum hemorrhage, transfusion, endometritis, and severe perineal lacerations) and composite neonatal morbidity (respiratory distress syndrome, mechanical ventilation, birth injury, seizures, hypoxic ischemic encephalopathy, therapeutic hypothermia, or umbilical artery pH ≤ 7.1). Outcomes were compared between patients with and without PLP, defined as ≥90th percentile of labor duration between admission and active phase. Results were stratified by induction of labor (IOL) versus spontaneous labor. A stratified analysis was performed by mode of delivery. Multivariable logistic regression was used to adjust for confounders. Results In this cohort of 6,509 patients, 51% underwent IOL. A total of 650 patients had a PLP with a median length of 8.5 hours in spontaneous labor and 18.8 hours in IOL. Among patients with PLP, there was a significant increase in composite maternal morbidity with both IOL (adjusted odds ratio [aOR]: 1.36, 95% confidence interval [CI]: 1.01, 1.84) and spontaneous labor (aOR: 1.49, 95% CI: 1.09, 2.04) and an increase in composite neonatal morbidity with spontaneous labor only (aOR: 1.57, 95% CI: 1.01, 2.45). Cesarean delivery occurred more often in PLP group (14.0 vs. 25.1%). Among patients who underwent cesarean delivery, PLP remained associated with increased odds of maternal morbidity compared with those with normal latent phase. Conclusion PLP at or above the 90th percentile in patients who reach active labor is associated with increased risk of maternal morbidity that is not mediated by cesarean delivery. PLP in spontaneous labor is associated with increased neonatal morbidity. These data suggest that further research is needed to establish latent phase cutoffs that may be incorporated into labor management guidelines. Key Points

( Am J Obstet Gynecol . 2023;229(4):449.e1–449.e6. doi: 10.1016/j.ajog.2023.04.018) Anemia is a common co-occurring diagnosis in pregnancy that is associated with an increased risk of several adverse pregnancy outcomes, including fetal growth restriction, preterm labor, and perinatal death. Prior studies demonstrated that maternal and fetal physiology may be protective against maternal anemia and decreased oxygen delivery to the fetus. In a 2021 study, it was observed that anemic pregnant patients had increased levels of partial pressure of oxygen in both the umbilical artery and vein at delivery compared with patients without anemia. Following these results, the present study sought to investigate how maternal anemia may be connected with electronic fetal monitoring (EFM) patterns associated with fetal hypoxia.