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1 Division of Child and Adolescent Psychiatry, Columbia University College of Physicians and Surgeons and New York State Psychiatric Institute, New York; Gertrude H. Sergievsky Center, Columbia University College of Physicians and Surgeons, Michigan
2 Division of Child and Adolescent Psychiatry, Columbia University College of Physicians and Surgeons and New York State Psychiatric Institute, New York
3 Division of Child and Adolescent Psychiatry, Columbia University College of Physicians and Surgeons and New York State Psychiatric Institute, New York; City College of New York
4 Children's Hospital of Philadelphia and the University of Pennsylvania School of Medicine, Department of Pediatrics, Division of General Pediatrics and Biostatistics and Epidemiology, Michigan
5 Department of Pediatrics and Human Development, College of Human Medicine, Michigan State University, East Lansing, Michigan
Objective. To assess the independent relation of neonatal cranial ultrasound (US) abnormalities in low birth weight (LBW) infants to cognitive outcomes at 6 years of age.
Design. Prospective cohort study.
Sample and Methods. Six-year follow-up data were obtained on a regional birth cohort of LBW infants (<2 kg) systematically screened as neonates with serial US. US abnormalities were dichotomized into isolated germinal matrix/intraventricular hemorrhage (GM/IVH) and parenchymal lesions/ventricular enlargement (PL/VE). Global cognitive outcomes (mental retardation, borderline intelligence, and normal intelligence) and selected specific cognitive abilities were assessed at 6 years of age with standardized instruments. Multivariate techniques were used to assess the effects of US independent of maternal social disadvantage at birth and other perinatal and neonatal risk factors.
Results. The sample as a whole had a significantly elevated rate of mental retardation (MR; 5%), almost all moderate to profound in severity. PL/VE was independently related to MR (odds ratio [OR], 65.8; confidence interval [CI], 19.1 to 22.4) and borderline intelligence (OR, 3.7;CI, 1.3 to 10.8); isolated GM/IVH was more modestly related to MR (OR, 4.6; CI, 1.2 to 18.6) but not related to borderline intelligence. Approximately half of the cases of MR were attributable to PL/VE independent of other factors. Of non-US factors, the number of days receiving mechanical ventilation increased the risk for MR. Maternal social disadvantage increased the risk for borderline intelligence but not MR. Among children of normal intelligence, those with PL/VE, but not isolated GM/IVH, performed more poorly than those without US abnormalities on tests of visual perceptual organization but not on tests of language, memory, or quantitative skills.
Conclusion. Prevention of white matter injury would substantially improve cognitive outcomes for LBW infants.
Submitted on June 6, 1995
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