Risk of Adverse Neonatal Outcomes After Combined Prenatal Cannabis and Nicotine Exposure.

Importance: The prevalence of cannabis use in pregnancy is rising and is associated with adverse perinatal outcomes. In parallel, combined prenatal use of cannabis and nicotine is also increasing, but little is known about the combined impact of both substances on pregnancy and offspring outcomes compared with each substance alone. Objective: To assess the perinatal outcomes associated with combined cannabis and nicotine exposure compared with each substance alone during pregnancy. Design, Setting, and Participants: This retrospective population-based cohort study included linked hospital discharge data (obtained from the California Department of Health Care Access and Information) and vital statistics (obtained from the California Department of Public Health) from January 1, 2012, through December 31, 2019. Pregnant individuals with singleton gestations and gestational ages of 23 to 42 weeks were included. Data were analyzed from October 14, 2023, to March 4, 2024. Exposures: Cannabis-related diagnosis and prenatal nicotine product use were captured using codes from International Classification of Diseases, Ninth Revision, Clinical Modification, and International Statistical Classification of Diseases, Tenth Revision, Clinical Modification. Main Outcome and Measures: The main outcomes were infant and neonatal death, infants small for gestational age, and preterm delivery. Results were analyzed by multivariable Poisson regression models. Results: A total of 3 129 259 pregnant individuals were included (mean [SD] maternal age 29.3 [6.0] years), of whom 23 007 (0.7%) had a cannabis-related diagnosis, 56 811 (1.8%) had a nicotine-use diagnosis, and 10 312 (0.3%) had both in pregnancy. Compared with nonusers, those with cannabis or nicotine use diagnoses alone had increased rates of infant (0.7% for both) and neonatal (0.3% for both) death, small for gestational age (14.3% and 13.7%, respectively), and preterm delivery (<37 weeks) (12.2% and 12.0%, respectively). Moreover, risks in those with both cannabis and nicotine use were higher for infant death (1.2%; adjusted risk ratio [ARR], 2.18 [95% CI, 1.82-2.62]), neonatal death (0.6%; ARR, 1.76 [95% CI, 1.36-2.28]), small for gestational age (18.0%; ARR, 1.94 [95% CI, 1.86-2.02]), and preterm delivery (17.5%; ARR, 1.83 [95% CI, 1.75-1.91]). Conclusions and Relevance: These findings suggest that co-occurring maternal use of cannabis and nicotine products in pregnancy is associated with an increased risk of infant and neonatal death and maternal and neonatal morbidity compared with use of either substance alone. Given the increasing prevalence of combined cannabis and nicotine use in pregnancy, these findings can help guide health care practitioners with preconception and prenatal counseling, especially regarding the benefits of cessation.

The amniotic fluid proteome changes across gestation in humans and rhesus macaques.

Amniotic fluid is a complex biological medium that offers protection to the fetus and plays a key role in normal fetal nutrition, organogenesis, and potentially fetal programming. Amniotic fluid is also critically involved in longitudinally shaping the in utero milieu during pregnancy. Yet, the molecular mechanism(s) of action by which amniotic fluid regulates fetal development is ill-defined partly due to an incomplete understanding of the evolving composition of the amniotic fluid proteome. Prior research consisting of cross-sectional studies suggests that the amniotic fluid proteome changes as pregnancy advances, yet longitudinal alterations have not been confirmed because repeated sampling is prohibitive in humans. We therefore performed serial amniocenteses at early, mid, and late gestational time-points within the same pregnancies in a rhesus macaque model. Longitudinally-collected rhesus amniotic fluid samples were paired with gestational-age matched cross-sectional human samples. Utilizing LC-MS/MS isobaric labeling quantitative proteomics, we demonstrate considerable cross-species similarity between the amniotic fluid proteomes and large scale gestational-age associated changes in protein content throughout pregnancy. This is the first study to compare human and rhesus amniotic fluid proteomic profiles across gestation and establishes a reference amniotic fluid proteome. The non-human primate model holds promise as a translational platform for amniotic fluid studies.

Antepartum vaginal bleeding: characteristics associated with delivery within seven days.

Objective: To identify maternal and/or fetal characteristics associated with delivery within seven days for patients who present with vaginal bleeding in the antepartum period.Methods: This is a retrospective chart review performed at a community-academic tertiary care center. Three hundred and twenty-two consecutive charts associated with admission for vaginal bleeding during pregnancy between January 2015 and May 2020 were reviewed. One hundred and twenty-six women were included based on singleton gestation, gestational age 24 0/7 - 36 6/7 weeks, self-limited vaginal bleeding, vital sign stability (blood pressure >100/60 mmHg, heart rate >60 beats per minute, respiratory rate <20 breaths per minute), absence of signs of labor, no known placenta previa/accreta, recent vaginal intercourse, or trauma. Patient demographic and clinical characteristics were compared using Fisher's exact and two-sample t-tests tests when appropriate. Univariate and multivariate logistic regression models were fitted to predict delivery within 7 days.Results: Thirty-four percent of women who presented with light vaginal bleeding delivered within seven days, with a mean of 2.6 days (n = 44/126). Patients without evidence of labor but with sterile vaginal exam (SVE) >2 cm on admission were 14 times more likely to deliver within 7 days than SVE ≤ 2 cm (AOR 14.49, 95% CI 3.33-63.03); however, 35.2% of women with SVE ≤ 2 cm still delivered in this timeframe (n = 12/34). Of the 59 patients who had cervical lengths (CL) performed, those with CL ≤2.5 cm were 4.22 times more likely to deliver within 7 days (OR 4.22, 95% CI 1.10-16.20). Seventy-eight percent of the patients who had CL >2.5 cm and SVE 0-1 cm went on to deliver >14 days from their initial bleeds (n = 18/23).Conclusion: Patients who present with self-limited vaginal bleeding and SVE > 2 cm should be admitted for antenatal steroids. Prolonged inpatient observation beyond the typical steroid window of 48-72 h should be dependent on the individual patient. Given that CL ≤2.5 cm and regular contractions are known risk factors for preterm delivery, these characteristics alone may also warrant extended inpatient observation, though even in conjunction with vaginal bleeding, neither was a significant predictor for delivery in our study. In contrast, the majority of patients with vaginal bleeding and SVE <2 cm delivered >14 days after their initial bleeds and are likely eligible for shorter periods of observation.

California Cardiovascular Screening Tool: Findings from Initial Implementation.

Objective American College of Obstetricians and Gynecologists (ACOG) recently published the California (CA) cardiovascular disease (CVD) screening algorithm for pregnant and postpartum women. We aim to prospectively determine screen-positive and true-positive rates of CVD among women across two populations. Study Design This is a prospective cohort study of obstetrical patients from April 2018 to July 2019 at academic medical centers in CA and New York (NY). We attempted to screen all patients at least once during their pregnancy care (prenatal or postpartum). Women who screened positive ("Red Flags," >3-4 moderate risk factors, abnormal physical examination, and persistent symptoms) underwent further testing. The primary outcome was the screen-positive rate. Secondary outcomes included the true-positive rate and the strength of each moderate factor in predicting a positive CVD screen. Results We screened 846 women. The overall screen-positive rate was 8% (5% in CA vs. 19% in NY). The sites differed in ethnicity, that is, African American women (2.7% in CA vs. 35% in NY, p < 0.01) and substance use (2.7 vs. 5.6%, p < 0.04). The true-positive rate was 1.5% at both sites. The percentage of screen-positive patients who did not complete follow-up studies was higher in NY (70%) than in CA (27%). CVD was confirmed in 30% with positive screens with complete follow-up. Combinations of moderate factors were the main driver of screen-positive rates in both populations. Conclusion This is the first data describing the performance of the CVD screening algorithm in a general obstetric population. Factors, such as proportion of African American women affect the likelihood of a positive screen. The screening algorithm highlights patients at higher lifetime risk of CVD and may identify a group that could be targeted for more direct care transitions postpartum. Data may be used to design a larger validation study.