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Cocaine/polydrug use in pregnancy: two-year follow-up
I J Chasnoff1, D R Griffith, C Freier
1Department of Pediatrics, Northwestern University Medical School, Chicago, IL.
Insights
Cocaine-exposed infants show catch-up growth but maintain smaller head circumference at two years. Developmental scores were similar, but more exposed infants had significantly lower scores.
Area of Science:
- Obstetrics and Gynecology
- Pediatrics
- Neonatology
Background:
- The long-term effects of prenatal drug exposure on infant development are not fully understood.
- While neonatal outcomes of cocaine exposure are documented, data on later developmental trajectories are limited.
Purpose of the Study:
- To evaluate the 2-year growth and developmental outcomes of infants exposed prenatally to cocaine, marijuana, and/or alcohol compared to unexposed controls.
- To identify specific drug effects on infant development and growth parameters.
Main Methods:
- A longitudinal study comparing three groups of infants: cocaine-exposed (with or without other drugs), non-cocaine drug-exposed, and drug-unexposed controls.
- Assessment of physical growth (weight, length, head circumference) and developmental milestones using the Bayley Scales of Infant Development up to 2 years of age.
Main Results:
- Cocaine-exposed infants had significantly smaller birth measurements but achieved catch-up growth in weight and length by one year.
- All drug-exposed infants, particularly those exposed to cocaine, exhibited significantly smaller head circumference through age two.
- While overall mean developmental scores were comparable, a higher proportion of drug-exposed infants scored below two standard deviations on cognitive and psychomotor indices.
Conclusions:
- Prenatal cocaine exposure is a strong predictor of reduced head circumference in infants.
- Despite catch-up physical growth, subtle long-term neurodevelopmental deficits may persist in infants exposed to cocaine and other substances.
- Continued monitoring and intervention are crucial for infants with prenatal drug exposure.
Abstract:
The impact of cocaine on pregnancy and neonatal outcome has been well documented over the past few years, but little information regarding long-term outcome of the passively exposed infants has been available. In the present study, the 2-year growth and developmental outcome for three groups of infants is presented: group 1 infants exposed to cocaine and usually marijuana and/or alcohol (n = 106), group 2 infants exposed to marijuana and/or alcohol but no cocaine (n = 45), and group 3 infants exposed to no drugs during pregnancy. All three groups were similar in racial and demographic characteristics and received prenatal care through a comprehensive drug treatment and follow-up program for addicted pregnant women and their infants. The group 1 infants demonstrated significant decreases in birth weight, length, and head circumference, but by a year of age had caught up in mean length and weight compared with control infants. The group 2 infants exhibited only decreased head circumference at birth. Head size in the two drug-exposed groups remained significantly smaller than in control infants through 2 years of age. On the Bayley Scales of Infant Development, mean developmental scores of the two groups of drug-exposed infants did not vary significantly from the control group, although an increased proportion of group 1 and 2 infants scored greater than two standard deviations below the standardized mean score on both the Mental Developmental Index and the Psychomotor Developmental Index compared with the control infants. Cocaine exposure was found to be the single best predictor of head circumference.(ABSTRACT TRUNCATED AT 250 WORDS)