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Neurobehavioral and Developmental Traiectories Associated with Level of Prenatal Cocaine Exposure

Claudia A Chiriboga1, Louise Kuhn2, Gail A Wasserman3

  • 1Division of Pediatric Neurology, Department of Neurology, College of Physicians and Surgeons, Columbia University, New York, USA ; Sergievsky Center, Columbia University, New York, NY, USA ; Harlem Hospital Center, New York, NY, USA.

Journal of Neurology and Psychology
|February 10, 2015
PubMed

Insights

Prenatal cocaine exposure negatively impacts infant mental development, but early neurological issues like hypertonia resolve over time. Microcephaly plays a role in these developmental differences.

Area of Science:

  • Neuroscience
  • Developmental Psychology
  • Pediatrics

Background:

  • Prenatal cocaine exposure is known to disrupt GABA and dopamine development in experimental models.
  • Clinical observations note abnormalities in tone, posture, and state regulation in infants exposed to cocaine prenatally.
  • The longitudinal evolution of these findings over time is not well-documented.

Purpose of the Study:

  • To assess the longitudinal effects of prenatal cocaine exposure on developmental, behavioral, and neurological trajectories.
  • To examine these effects in a dose-dependent manner over the first two years of life.

Main Methods:

  • Three hundred eighty infants (113 cocaine-exposed) were enrolled at birth.
  • Exposure was confirmed via maternal interview and hair, meconium, and urine analyses.
  • Developmental, behavioral, and neurological assessments were conducted blindly at 6, 12, and 24 months using mixed-effects linear modeling.

Main Results:

  • A negative mental developmental growth curve (–2.2 points/year) was observed in cocaine-exposed children (p=.04).
  • Microcephaly at 6 months modified the association between cocaine exposure and mental development.
  • Early hypertonia resolved more rapidly in cocaine-exposed infants, and this neurological finding did not predict long-term impairment.

Conclusions:

  • Prenatal cocaine exposure has a sustained teratogenic effect on brain development, mediated by microcephaly, impacting mental performance.
  • Early neurological and behavioral deficits associated with prenatal cocaine exposure tend to improve over time.
  • Transient neurobehavioral manifestations may reflect postnatal homeostatic mechanisms for GABA and dopaminergic systems.
Abstract

Keywords:
BehaviorChild developmentCocaine exposureDrug useHypertoniaNeurologicPerinatal

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