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Patterns of 1-day and 4-month motor functioning in infants of women on methadone
Insights
Infants exposed to methadone in utero showed poorer motor functioning at both 1 day and 4 months. This developmental difference was consistently identified using behavioral assessments, highlighting long-term motor skill impacts.
Area of Science:
- Neonatal Development
- Developmental Psychology
- Neuroscience
Background:
- Prenatal exposure to substances like methadone can impact infant neurodevelopment.
- Understanding the long-term effects of in utero methadone exposure on motor skills is crucial for early intervention.
Purpose of the Study:
- To assess and compare the motor functioning of infants exposed and not exposed to methadone in utero.
- To investigate the continuity of motor development from the neonatal period to 4 months of age.
Main Methods:
- Utilized the Brazelton Neonatal Behavioral Assessment Scale with Kansas Supplements (NBAS-K) at 1 day.
- Employed the Bayley Infant Behavior Record (IBR) at 4 months.
- Applied Guttman's Multidimensional Scalogram Analysis (MSA) and scatterplot analysis for motor item profiles and behavioral continuity.
Main Results:
- Infants exposed to methadone exhibited poorer motor coordination, increased tenseness, heightened interest in body motion, and higher activity levels at 4 months.
- Multidimensional Scalogram Analysis demonstrated near-perfect discrimination between methadone-exposed and non-exposed infants based on IBR motor items.
- A significant correlation between 1-day and 4-month motor functioning was observed, with methadone-exposed infants consistently showing poorer motor skills.
Conclusions:
- Prenatal methadone exposure is associated with persistent deficits in motor functioning from infancy through early childhood.
- Behavioral continuity analyses confirm the reliable identification of motor impairments in methadone-exposed infants.
- These findings underscore the importance of monitoring and supporting motor development in infants with prenatal substance exposure.
Abstract:
Motor functioning of 38 infants, 15 exposed in utero to methadone, was assessed on Brazelton Neonatal Behavioral Assessment Scale with Kansas Supplements (NBAS-K) (Items: General Tonus, Motor Maturity, Activity, and Tremulousness) at 1 day, and at 4 months on Bayley Infant Behavior Record (IBR) (Items: Tension, Activity, Interest in Body Motion, Gross Coordination, and Fine Coordination). At 4 months, methadone infants generally showed a profile of poorer motor coordination, greater tenseness and interest in body motion, and higher activity level than did non-methadone infants. Guttman's Multidimensional Scalogram Analysis (MSA) of the 5 IBR motor-item profiles showed that a line can be drawn that almost perfectly discriminates the methadone and non-methadone infants by their joint performance on these 5 variables. A scatterplot of each infant's sum scores of the Brazelton versus IBR motor items revealed a significant correlation between 1-day and 4-month motor functioning. Methadone infants showed poorer motor functioning at both ages. This analysis of behavioral continuity again revealed an almost perfect discrimination between the two groups.