Heavy prenatal alcohol exposure and overall morbidities: a Danish nationwide cohort study from 1996 to 2018

An overview of current advances in perinatal alcohol exposure and pathogenesis of fetal alcohol spectrum disorders

The adverse use of alcohol is a serious global public health problem. Maternal alcohol consumption during pregnancy usually causes prenatal alcohol exposure (PAE) in the developing fetus, leading to a spectrum of disorders known as fetal alcohol spectrum disorders (FASD) and even fetal alcohol syndrome (FAS) throughout the lifelong sufferers. The prevalence of FASD is approximately 7.7 per 1,000 worldwide, and is even higher in developed regions. Generally, Ethanol in alcoholic beverages can impair embryonic neurological development through multiple pathways leading to FASD. Among them, the leading mechanism of FASDs is attributed to ethanol-induced neuroinflammatory damage to the central nervous system (CNS). Although the underlying molecular mechanisms remain unclear, the remaining multiple pathological mechanisms is likely due to the neurotoxic damage of ethanol and the resultant neuronal loss. Regardless of the molecular pathway, the ultimate outcome of the developing CNS exposed to ethanol is almost always the destruction and apoptosis of neurons, which leads to the reduction of neurons and further the development of FASD. In this review, we systematically summarize the current research progress on the pathogenesis of FASD, which hopefully provides new insights into differential early diagnosis, treatment and prevention for patents with FASD.

Dose-response effect of prenatal alcohol exposure on perinatal outcomes

BACKGROUND

A better understanding of the effects of lower levels of prenatal alcohol exposure (PAE), as a common exposure, is needed. The goal of this study was to examine the effects of mild-moderate PAE and episodic binge drinking on perinatal outcomes.

METHODS

The data were obtained from three prospective cohorts with a combined sample of 281 participants: 125 with PAE and 156 without PAE. Alcohol-related measures included the Alcohol Use Disorders Identification Test, timeline follow-back questionnaires (covering the periconceptional period, mid-gestation, and late gestation), and biomarkers. Absolute alcohol per day (AAD) and per drinking day (AADD), number of binge episodes, and maximum number of drinks in a 24-h period were estimated. Perinatal outcomes included gestational age and anthropometric measures. Data were analyzed using correlation and multivariable regression analysis.

RESULTS

Among women with PAE, average alcohol consumption across the periconceptional period and pregnancy was 0.37 oz ± 0.74 AA/day (~5 drinks/week). After adjusting for tobacco co-exposure and sociodemographic characteristics, significant associations between all alcohol measures and gestational age at delivery were observed, including cumulative measures of AAD (β = -0.58; 95% CI: -0.98; -0.17) and AADD (β = -0.58; 95% CI: -0.90; -0.26) during pregnancy and the periconceptional period. A significant association between the maximum number of drinks in a 24-h period and birth length percentile (β = -0.70; 95% CI: -1.36; -0.04) was observed in the final model. PAE was associated with lower birth weight percentile in univariate analyses only.

CONCLUSIONS

Results of this study demonstrate a negative association between mild-moderate PAE and episodic binge drinking with gestational age at delivery and birth length percentile after controlling for other factors. Robust negative effects of PAE, including in the periconceptional period before pregnancy recognition, on duration of gestation highlight the need for primary prevention efforts aimed at PAE in persons of reproductive age.

Association between maternal social vulnerability and cesarean delivery: A cohort study

OBJECTIVE

Although social vulnerability has been correlated to adverse obstetrical outcomes, its definition as well as its correlation to mode of delivery vary between different studies. The aim of this study is to evaluate the association between maternal social vulnerabilities and cesarean section with the inclusion of a wide range of social vulnerability characteristics.

STUDY DESIGN

The current study is a retrospective single center cohort study in a tertiary care maternity unit between January 2020 and December 2021. All women who delivered after 24 gestational weeks were included. Multiple component analysis (MCA) grouped vulnerability characteristics in three independent vulnerability axes, named after their clinical relevance as administrative, psychological, and dependency axis. Multiple logistic regression was performed, controlling for obstetrical, medical factors as well as the Robson classification.

RESULTS

In total, 7707 patients were identified. After adjustment for the aforementioned factors, a statistically significant association was shown between administrative vulnerability index and cesarean section before labor or during labor respectively (aOR 1.48 [1.23 - 1.78] and aOR 1.46 [OR 1.23 - 1.73]). In contrast, no significant correlation was found for the psychological vulnerability index (aOR 1.09 [0.86 - 1.38] and aOR 0.99 [0.78 - 1.25]) or the dependency vulnerability index (aOR 0.98 [0.76 - 1.26] and aOR 0.85 [0.64 - 1.12]).

CONCLUSIONS

The current study provides new insight into the correlation between social vulnerabilities and the risk of cesarean section. It demonstrates that administrative vulnerability is an independent risk factor of cesarean delivery. These patients should be identified and offered an adapted pregnancy monitoring in order to reduce cesarean section rates.

Association of Pregnancy-Specific Alcohol Policies With Infant Morbidities and Maltreatment

Importance

Research has found associations of pregnancy-specific alcohol policies with increased low birth weight and preterm birth, but associations with other infant outcomes are unknown.

Objective

To examine the associations of pregnancy-specific alcohol policies with infant morbidities and maltreatment.

Design, Setting, and Participants

This retrospective cohort study used outcome data from Merative MarketScan, a national database of private insurance claims. The study cohort included individuals aged 25 to 50 years who gave birth to a singleton between 2006 and 2019 in the US, had been enrolled 1 year before and 1 year after delivery, and could be matched with an infant. Data were analyzed from August 2021 to April 2023.

Exposures

Nine state-level pregnancy-specific alcohol policies obtained from the National Institute on Alcohol Abuse and Alcoholism's Alcohol Policy Information System.

Main Outcomes and Measures

The primary outcomes were 1 or more infant injuries associated with maltreatment and infant morbidities associated with maternal alcohol consumption within the first year. Logistic regression, adjusting for individual-level and state-level controls, and fixed effects for state, year, state-specific time trends, and SEs clustered by state were used.

Results

A total of 1 432 979 birthing person-infant pairs were included (mean [SD] age of birthing people, 32.2 [4.2] years); 30 157 infants (2.1%) had injuries associated with maltreatment, and 44 461 (3.1%) infants had morbidities associated with alcohol use during pregnancy. The policies of Reporting Requirements for Assessment/Treatment (adjusted odds ratio [aOR], 1.28; 95% CI, 1.08-1.52) and Mandatory Warning Signs (aOR, 1.18; 95% CI, 1.10-1.27) were associated with increased odds of infant injuries but not morbidities. Priority Treatment for Pregnant Women Only was associated with decreased odds of infant injuries (aOR, 0.83; 95% CI, 0.76-0.90) but not infant morbidities. Civil Commitment was associated with increased odds of infant injuries (aOR, 1.26; 95% CI, 1.08-1.48) but decreased odds of infant morbidities (aOR, 0.57; 95% CI, 0.53-0.62). Priority Treatment for Pregnant Women and Women With Children was associated with increased odds of both infant injuries (aOR, 1.12; 95% CI, 1.00-1.25) and infant morbidities (aOR, 1.08; 95% CI, 1.03-1.13). Reporting Requirements for Child Protective Services, Reporting Requirements for Data, Child Abuse/Neglect, and Limits on Criminal Prosecution were not associated with infant injuries or morbidities.

Conclusions and Relevance

In this cohort study, most pregnancy-specific alcohol policies were not associated with decreased odds of infant injuries or morbidities. Policy makers should not assume that pregnancy-specific alcohol policies improve infant health.