Health outcomes among infants born to women deployed to United States military operations during pregnancy

Effect of active-duty military service on neonatal birth outcomes: a systematic review

INTRODUCTION

Increasing numbers of women serve in the armed forces in countries worldwide. Stress experienced during pregnancy is associated with adverse birth outcomes including preterm delivery (PTD) and low birth weight (LBW). Several characteristics of military employment and lifestyle can increase stress acting on active-duty servicewomen (ADSW) and hence may increase the risk of adverse neonatal outcomes. This paper reviews the prevalence of PTD, preterm labour (PTL), LBW and stillbirth in babies born to ADSW in the armed forces.

METHODS

This systematic review followed the Preferred Reporting Items for Systematic Reviews and Meta-Analyses protocol. Medline, EMBASE, Web of Science, Global Health and CINAHL Plus databases were searched from inception to July 2021 (November 2023, EMBASE) using subject heading and keyword searches for English language journal articles on babies born to ADSW in any military branch and any country. The Joanna Briggs Institute prevalence critical appraisal tool assessed risk of bias in included papers. Studies were paired with a comparator non-active-duty population to generate a prevalence ratio as the effect measure. A narrative synthesis was conducted.

RESULTS

21 observational studies fulfilled the eligibility criteria. They were all conducted in the US military, involved a total of 650 628 participants, and were published between 1979 and 2023. Their results indicate increased LBW in ADSW compared with non-service women. There was insufficient evidence to conclude or rule out whether ADSW have increased rates of PTD or PTL.

CONCLUSIONS

ADSW may be at increased risk of having an LBW baby. However, caution is needed if seeking to generalise the findings beyond the US context. This review highlights a growing need for female-specific research in other armed forces and, specifically, into reproductive health. Such research is necessary to inform military maternity pathways and policies in ways that safeguard mothers and their babies while enhancing military readiness.

A Scoping Review of Pregnancy, Childbirth, and the Postpartum Period in Active Duty U.S. Military Women

PURPOSE

Women in the U.S. military encounter unique challenges during the perinatal period that are driven by military requirements for mission readiness. The purpose of this scoping review was to systematically examine the extent, range, and nature of the literature on pregnancy, childbirth, and the postpartum period of active duty military women. A secondary aim was to identify leverage points for changes to improve perinatal health of servicewomen.

METHODS

We used a PRISMA-ScR protocol to guide this scoping review of research and non-research articles germane to the perinatal health of servicewomen. In the protocol, we identified the rationale, objectives, eligibility criteria, search strategy, sources of evidence, and data charting processes for the review. We used the social ecological model for military women's health framework to guide the synthesis of results.

FINDINGS

Eighty-four articles on the topics of pregnancy, childbirth, and the postpartum period of servicewomen published from 2000 to 2018 were identified. The articles were mainly research studies (n = 76), of which 49 had observational designs. Leverage points to promote workplace safety and support of pregnant women, perinatal screening, recognition of pregnancy and postpartum depression, and maintaining physical fitness during pregnancy and the postpartum period were identified in multiple levels of the social ecological model for military women's health.

CONCLUSIONS

Literature published from 2000 to 2018 is broad in scope, yet generally lacks a robust body of evidence on any one topic. Implementing strategies and military policies that are directed at the identified leverage points could enhance the health of childbearing servicewomen.

Australian Veterans of the Middle East Conflicts 2001–2010: Select Reproductive Health Outcomes Part 2 — Prenatal, Fetal, and Neonatal Outcomes

Background: Following on from Part 1 of these companion articles, which described the maternal and paternal cohort of the Middle East Area of Operations (MEAO) Census Study, this manuscript aims to describe fetal and infant characteristics and outcomes from the self-report data, including live deliveries, stillbirths, all other pregnancy losses, and unknown outcomes.

Methods: A descriptive analysis was performed on the clinical variables where data were reported. Descriptive statistics (means, frequencies, percentiles) were used to describe the occurrence of adverse gestational outcomes. Odds ratios were also calculated for perinatal outcomes. Infant characteristics and outcomes were evaluated using statistical analysis software IBM SPSS v26.

Results: There were 15,417 pregnancies reported by respondents to the MEAO Census Study. Of these, 74% (11,367) resulted in a live delivery, 0.75% in a stillbirth, and 20% in another type of pregnancy loss (ectopic pregnancy, miscarriage, termination). The unadjusted odds of an adverse perinatal outcome were higher in the MEAO Census population than in the general Australian population, notably stillbirth (OR = 3.11, 95% CI 2.56–3.80), perinatal death (OR = 3.80, 95% CI 3.26–4.44), and neonatal death (OR = 5.43, 95% CI 4.27–6.91). There were 499 cases of birth defects reported and 85 cases of childhood cancer in the MEAO population. The unadjusted odds of childhood cancer were slightly higher (OR = 1.7, 95% CI 0.09–3.28) in the MEAO population, and the unadjusted odds of birth defects were lower (OR = 0.52, 95% CI 0.40–0.68). The male:female infant sex ratio of babies born to respondents was 102 (5939 males:5823 females).

Conclusions: The MEAO Census Study presents a generally reassuring picture of reproductive health for women serving in the Australian Defence Force with regards to the risk of pregnancy loss and perinatal outcomes. The increased odds of perinatal and neonatal death and stillbirth are worthy of further study and evaluation, as is the increase in likelihood of childhood cancer in the offspring of MEAO veterans.

Deployment Among Active-Duty Military Women and Pregnancy-Related Hypertensive Disorders

INTRODUCTION

Today women comprise 15% of the U.S. active-duty military, but are often overlooked in research of the Armed Forces. While some of the challenges faced by women are similar to men, they encounter unique stressors, including pregnancy-related issues. Hypertensive disorders of pregnancy (HDPs) affect 5-10% of pregnancies annually and have been linked to maternal stress, but no studies have assessed the impact of maternal military deployment on HDP incidence. Thus, the purpose of the current study was to quantify the risk of HDP among active-duty U.S. military mothers who deployed in the post-9/11/2001 era.

MATERIALS AND METHODS

We conducted a retrospective cohort study using a U.S. Department of Defense database comprised of all active-duty women who gave birth to their first, live-born singleton infant using Tricare from January 1, 2004 to December 31, 2008. The database included records for maternal/infant birth hospitalizations and deployment. HDP was defined with ICD-9-CM codes in the maternal birth hospitalization record. We evaluated the risk of HDP associated with several deployment measures for the cohort overall and among racial/ethnic groups: (1) deployment in general (yes vs. no); (2) timing of deployment ending prior to birth (<12 months or ≥12 months prior vs. non-deployed); and, (3) cumulative time spent deployed since 9/11/2001. We used multivariable logistic regression and reported odds-ratios (OR) and 95% confidence intervals (CI). We also explored meaningful categorization of certain continuous deployment measures associated with HDP incidence. The study was approved by the University of South Florida Institutional Review Board.

RESULTS

There were a total of 36,667 births and 13.4% of mothers experienced at least one HDP. No increased risk of HDP was observed for deployed mothers compared with non-deployed mothers in the complete cohort (OR = 1.02, 95% CI: 0.95-1.09), but cumulative deployment length ≥1 year was identified as a potential risk factor for HDP vs. <1 year deployment (OR = 1.17, 95% CI: 1.00-1.36).

CONCLUSION

Our study was the first to quantify the incidence of HDP among active-duty military women giving birth to their first child. It was slightly higher than in the general population, but deployment overall is seemingly not responsible for the elevated incidence.

Deployment and Preterm Birth Among US Army Soldiers

With increasing integration of women into combat roles in the US military, it is critical to determine whether deployment, which entails unique stressors and exposures, is associated with adverse reproductive outcomes. Few studies have examined whether deployment increases the risk of preterm birth; no studies (to our knowledge) have examined a recent cohort of servicewomen. We therefore used linked medical and administrative data from the Stanford Military Data Repository for all US Army soldiers with deliveries between 2011 and 2014 to estimate the associations of prior deployment, recency of deployment, and posttraumatic stress disorder with spontaneous preterm birth (SPB), adjusting for sociodemographic, military-service, and health-related factors. Of 12,877 deliveries, 6.1% were SPBs. The prevalence was doubled (11.7%) among soldiers who delivered within 6 months of their return from deployment. Multivariable discrete-time logistic regression models indicated that delivering within 6 months of return from deployment was strongly associated with SPB (adjusted odds ratio = 2.1, 95% confidence interval: 1.5, 2.9). Neither multiple past deployments nor posttraumatic stress disorder was significantly associated with SPB. Within this cohort, timing of pregnancy in relation to deployment was identified as a novel risk factor for SPB. Increased focus on servicewomen's pregnancy timing and predeployment access to reproductive counseling and effective contraception is warranted.

Depression, Anxiety, and Pharmacotherapy Around the Time of Pregnancy in Hawaii

BACKGROUND

Depression and anxiety are common conditions among pregnant and postpartum women, but population-based information is lacking on treatments and help-seeking behaviors.

PURPOSE

This study described the prevalence of depression, anxiety, pharmaceutical treatment, and help-seeking behaviors among a multiethnic population of women with recent live births in Hawaii.

METHOD

Hawaii Pregnancy Risk Assessment Monitoring System data from 4735 respondents were weighted to be representative of all pregnancies resulting in live births in Hawaii in 2009-2011 and were used to estimate the prevalence of several indicators related to anxiety and depression before, during, and after pregnancy among women with recent live births.

RESULTS

Of Hawaii women with live births in 2009-2011, 7.3 % reported visiting a healthcare worker to be checked or treated for depression or anxiety in the year before their most recent pregnancy, 4.9 % reported having depression in the 3 months before pregnancy, 5.9 % reported having anxiety in the same period, 9.1 % screened positive for postpartum depression, and 6.9 % reported asking a doctor, nurse, or other healthcare worker for help for anxiety postpartum. The prevalence of antianxiety and antidepressant prescription drug use was 2.3 % in the month before pregnancy and 1.4 % during pregnancy. Hawaii had lower prevalence of pre-pregnancy depression, anxiety, and depression/anxiety health visits than other US states. Pre-pregnancy depression and anxiety and postpartum anxiety help-seeking behaviors differed significantly by race/ethnicity.

CONCLUSION

Depression and anxiety are common among pregnant and postpartum women in Hawaii. More research could better inform heath care professionals and patients of the treatment options available and their potential risks and benefits.

Development of a mother-child database for drug exposure and adverse event detection in the Military Health System

PURPOSE

The aim of this study was to develop a mother-child linked database consisting of all eligible active duty military personnel, retirees, and their dependents in order to conduct medication-related analyses to improve the safety and quality of care in the Military Health System (MHS).

METHODS

Eligible women of reproductive age with at least one pregnancy-related encounter between January 2005 and December 2013 receiving care in the MHS were included in the study population. Building on previously published algorithms, we used pregnancy-related diagnostic and procedure codes, parameterized temporal constraints, and data elements unique to the MHS to identify pregnancies ending in live births, stillbirth, spontaneous abortion, or ectopic pregnancy. Pregnancies ending in live births were matched to presumptive offspring using birth dates and family-based sponsorship identification. Antidepressant and antiepileptic use during pregnancy was evaluated using electronic pharmacy data.

RESULTS

Algorithms identified 755,232 women who experienced 1,099,648 complete pregnancies with both pregnancy care encounter and pregnancy outcome. Of the 924,320 live birth pregnancies, 827,753 (90.0%) were matched to offspring. Algorithms also identified 5,663 stillbirths, 11,358 ectopic pregnancies, and 169,665 spontaneous abortions. Among the matched singleton live birth pregnancies, 7.1% of mothers were dispensed an antidepressant at any point during pregnancy, usually a selective serotonin reuptake inhibitor, (75.3%), whereas 1.3% of mothers were dispensed an antiepileptic drug.

Remodeling of axo-spinous synapses in the pathophysiology and treatment of depression

Dendritic spines provide a compartment for assembly and functional organization of synaptic machinery that plays a fundamental role in neuronal communication and neuroplasticity. Studies in humans as well as in animal models have demonstrated abnormal spine architecture in several psychiatric disorders, including depression and other stress-related illnesses. The negative impact of stress on the density and organization of spines is thought to contribute to the behavioral deficits caused by stress exposure. Moreover, there is now evidence that medication-induced recovery involves changes in synaptic plasticity and dendrite morphology, including increased expression of pre- and postsynaptic plasticity-related proteins, as well as the density and function of axo-spinous synapses. Here we review the evidence from brain imaging and postmortem studies demonstrating that depression is accompanied by structural and functional alterations of cortical and limbic brain regions, including the prefrontal cortex, hippocampus and amygdala. In addition, we present more direct evidence from basic research studies that exposure to stress alters spine morphology, function and plasticity and that antidepressants, particularly new rapid acting agents, reverse these effects. Elucidation of the signaling pathways and molecular mechanisms that control spine synapse assembly and plasticity will contribute to a better understanding of the pathophysiology of depression and development of novel, more effective therapeutic agents.

Prenatal Stress Alters Progestogens to Mediate Susceptibility to Sex-Typical, Stress-Sensitive Disorders, such as Drug Abuse: A Review

Maternal-offspring interactions begin prior to birth. Experiences of the mother during gestation play a powerful role in determining the developmental programming of the central nervous system. In particular, stress during gestation alters developmental programming of the offspring resulting in susceptibility to sex-typical and stress-sensitive neurodevelopmental, neuropsychiatric, and neurodegenerative disorders. However, neither these effects, nor the underlying mechanisms, are well understood. Our hypothesis is that allopregnanolone, during gestation, plays a particularly vital role in mitigating effects of stress on the developing fetus and may mediate, in part, alterations apparent throughout the lifespan. Specifically, altered balance between glucocorticoids and progestogens during critical periods of development (stemming from psychological, immunological, and/or endocrinological stressors during gestation) may permanently influence behavior, brain morphology, and/or neuroendocrine-sensitive processes. 5α-reduced progestogens are integral in the developmental programming of sex-typical, stress-sensitive, and/or disorder-relevant phenotypes. Prenatal stress (PNS) may alter these responses and dysregulate allopregnanolone and its normative effects on stress axis function. As an example of a neurodevelopmental, neuropsychiatric, and/or neurodegenerative process, this review focuses on responsiveness to drugs of abuse, which is sensitive to PNS and progestogen milieu. This review explores the notion that allopregnanolone may effect, or be influenced by, PNS, with consequences for neurodevelopmental-, neuropsychiatric-, and/or neurodegenerative- relevant processes, such as addiction.