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Published on: February 25, 2016
Prenatal Substance Exposure and Early Childhood Adversity: Implications for Child Autonomic Functioning at Early
Madison R Kelm1, Olivia Bell2, Pamela Schuetze3
16386 Alvarado Court, Suite 100, San Diego, CA, 92120, San Diego State University.
Insights
Prenatal tobacco exposure impacts child autonomic nervous system (ANS) functioning, affecting skin conductance and heart rate regulation. Interventions promoting smoking cessation in pregnancy are crucial, especially for those using multiple substances.
Area of Science:
- Neuroscience
- Developmental Psychology
- Public Health
Background:
- Prenatal substance exposure, particularly tobacco, is a significant concern for child development.
- Understanding its impact on the autonomic nervous system (ANS) requires controlling for other exposures and postnatal factors.
- Autonomic regulation in infancy and childhood is a key indicator of neurodevelopmental outcomes.
Purpose of the Study:
- To investigate the associations between prenatal tobacco exposure and autonomic functioning at early school-age.
- To examine the mediating roles of infancy autonomic regulation, harsh parenting, and cumulative postnatal adversities.
- To differentiate the effects of prenatal tobacco from other substance exposures.
Main Methods:
- Prospective study of 216 mothers and infants, with detailed assessments of prenatal substance exposure (biomarkers, interviews).
- Measurement of harsh parenting and early childhood adversity from birth to early school-age.
- Assessment of child autonomic functioning via respiratory sinus arrhythmia (RSA) and skin conductance (SCL) at rest and during frustration.
Main Results:
- Prenatal tobacco and cannabis exposure uniquely predicted higher baseline SCL and RSA, respectively.
- Prenatal tobacco exposure indirectly led to lower SCL and blunted SCL reactivity through increased childhood adversity.
- Prenatal cocaine exposure was linked to higher SCL and reactivity, mediated by harsh parenting.
Conclusions:
- Prenatal tobacco exposure has direct and indirect effects on child ANS functioning, independent of other substance exposures.
- Smoking cessation interventions during pregnancy are vital, particularly for polysubstance users.
- Parenting interventions and support systems can mitigate risks associated with prenatal substance use.
Introduction:
We examined associations between prenatal tobacco exposure (controlling for other substance exposures) and autonomic functioning at early school-age via infancy autonomic regulation, harsh parenting, and cumulative postnatal adversities.
Methods:
216 mothers (74% Black/African-American) and infants (51% girls) recruited at delivery were assessed repeatedly. Prenatal substance exposure was measured using multiple biomarkers and calendar-based interviews. Harsh parenting and early childhood adversity were assessed from birth to early school-age. Child ANS functioning was indexed via respiratory sinus arrhythmia (RSA) and skin conductance (SCL) at early school-age (both at rest and reactivity to frustration).
Results:
Prenatal tobacco and cannabis exposure accounted for unique variance in higher baseline SCL and RSA, respectively. Prenatal tobacco exposure was also indirectly associated with lower baseline SCL and blunted SCL reactivity via increased early childhood adversity. There was stability in baseline RSA from infancy to early school-age with prenatal cocaine exposure and prenatal cannabis exposure associated with lower baseline RSA in infancy. Prenatal cocaine exposure was also associated with higher baseline SCL and higher SCL reactivity via more harsh parenting.
Conclusions:
Findings highlight unique direct and indirect effects of prenatal tobacco exposure on child ANS functioning at early school-age, controlling for exposure to other substances and co-occurring risks. Results underscore the importance of smoking cessation interventions in pregnancy that address prenatal polysubstance use.
Implications:
The present study adds to the sparse literature on effects of prenatal tobacco exposure on autonomic nervous system functioning controlling for other substance exposure and co-occurring postnatal risks in a prospective design. Findings highlight the importance of smoking cessation treatments for pregnant individuals who use other substances in addition to tobacco. Furthermore, universal parenting interventions may promote positive outcomes even in the context of substance use. Efforts to address parents' mental health and provide parental support in the context of substance use may be of great benefit to families.
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