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Published on: August 25, 2014
Prenatal cocaine exposure: drug and environmental effects at 9 years
Lynn T Singer1, Suchitra Nelson, Elizabeth Short
1Department of Pediatrics, Case Western Reserve University, Cleveland, OH, USA. Lynn.Singer@case.edu
Insights
Prenatal cocaine exposure (CE) is linked to lower IQ in children, particularly in perceptual reasoning, with effects mediated by fetal brain development. School achievement was not impacted.
Area of Science:
- Neuroscience
- Developmental Psychology
- Pediatrics
Background:
- Prenatal substance exposure is a significant concern for child development.
- Cocaine's long-term effects on cognitive and achievement outcomes require further investigation.
- Controlling for confounding factors is crucial in understanding these effects.
Purpose of the Study:
- To evaluate the impact of prenatal cocaine exposure on school-age cognitive and achievement outcomes.
- To identify and control for confounding variables, including drug and environmental factors.
- To explore the relationship between cocaine metabolite concentration and cognitive impairment.
Main Methods:
- A longitudinal, prospective study followed 371 children from birth to age 9.
- Cognitive (IQ) and school achievement were assessed in 192 children with prenatal cocaine exposure (CE) and 179 non-cocaine exposed (NCE) children.
- Confounding variables included caregiving environment, polydrug exposure, blood lead level, iron-deficiency anemia (IDA), and foster/adoptive care.
Main Results:
- Prenatal cocaine exposure predicted lower perceptual reasoning IQ, with impairment correlating linearly with benzoylecgonine concentration.
- Effects were mediated by reduced birth head circumference, suggesting an impact on fetal brain growth.
- Negative effects of alcohol, lead, and marijuana exposure, and positive effects of the home environment, were additive; school achievement was unaffected.
Conclusions:
- Persistent teratologic effects of prenatal cocaine exposure on specific cognitive functions were observed.
- Additive effects of other prenatal exposures (alcohol, lead, marijuana), IDA, and home environment were significant.
- Documenting environmental factors is vital, as CE was associated with better home environments and lower risks in a notable portion of the sample.
Objective:
To assess school-age cognitive and achievement outcomes in children with prenatal cocaine exposure, controlling for confounding drug and environmental factors.
Study Design:
At age 9 years, 371 children (192 cocaine exposure [CE]; 179 non-cocaine exposure [NCE]) were assessed for IQ and school achievement in a longitudinal, prospective study from birth. An extensive number of confounding variables were controlled, including quality of caregiving environment, polydrug exposure, blood lead level, iron-deficiency anemia (IDA), and foster/adoptive care.
Results:
Prenatal cocaine exposure predicted poorer perceptual reasoning IQ, with a linear relationship of the concentration of the cocaine metabolite benzoylecgonine to the degree of impairment. Effects were mediated through birth head circumference, indicating a relationship with fetal brain growth. Negative effects of alcohol, lead, and marijuana exposure and positive effects of the home environment were additive. The CE children in foster/adoptive care had better home environments and lower lead levels. School achievement was not affected.
Conclusions:
Persistent teratologic effects of CE on specific cognitive functions and additive effects of alcohol, lead, and marijuana exposure; IDA; and the home environment were identified. Documenting environmental factors in behavioral teratology studies is important, because in this sample, CE was associated with better home environment and lower environmental risk in a substantial number of children.
