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PEDIATRICS Vol. 102 No. 2 August 1998, pp. 315-322

Perinatal Correlates of Cerebral Palsy and Other Neurologic Impairment Among Very Low Birth Weight Children

Received Oct 28, 1997; accepted Feb 24, 1998.

Deanne Wilson-Costello*, Elaine BorawskiDagger , Harriet Friedman*, Raymond Redline§, Avroy A. Fanaroff*, and Maureen Hack*

From the Departments of * Pediatrics, Dagger  Epidemiology and Biostatistics, and § Pathology, Case Western Reserve University, Cleveland, Ohio.

Background and Objective.  The etiology of neurologic impairments among very low birth weight (VLBW, <1.5 kg) children is poorly understood. We sought to investigate the perinatal predictors of major neurologic impairment, including cerebral palsy, among VLBW children.

Methods.  Antenatal, intrapartum, and neonatal events and therapies were compared between 72 singleton inborn VLBW children born between 1983 to 1991 who had neurologic impairment at 20 months corrected age (including 50 with cerebral palsy and 22 with other neurologic impairments) and 72 neurologically normal VLBW children matched by birth weight, gestational age, race, and sex via a retrospective case-control method. Multiple logistic regression was conducted, entering only those variables found to be significant at the bivariate level.

Results.  There were no significant differences in the rates of pregnancy-induced hypertension, maternal tocolytic use including magnesium, or antenatal steroid therapy. Higher rates of clinical chorioamnionitis were found among the mothers of the neurologically impaired children as compared with controls (31% vs 11%), but not among the subgroup of mothers of children with cerebral palsy (22% vs 12%). Significant differences in neonatal factors among the total neurologically-impaired group (n = 72) versus controls included oxygen dependence at 36 weeks (31% vs 15%), septicemia (53% vs 31%), severe cranial ultrasound abnormality (50% vs 17%), and hypothyroxinemia (43% vs 25%). In the subgroup with cerebral palsy (n = 50), significant differences included days on the ventilator (23 vs 14 days), septicemia (54% vs 33%), and severe cranial ultrasound abnormality (52% vs 12%). Multivariate analysis controlling for birth weight, gestational age, race, sex, and the birth period (before 1990 versus 1990 and after) revealed direct and independent effects of clinical chorioamnionitis [odds ratio (OR), 3.79; confidence interval (CI), 1.34-10.78], severe cranial ultrasound abnormality (OR, 9.97; CI, 3.84-25.87), and septicemia (OR, 2.46; CI, 1.10-5.52) on total neurologic impairment. Consideration of the 50 cases with cerebral palsy revealed direct and independent effects of severe cranial ultrasound abnormality only (OR, 15.01; CI, 4.34-51.93).

Conclusions.  Both antenatal and neonatal risk factors contribute to the development of severe neurologic impairment, including cerebral palsy among VLBW children. Because prevention of chorioamnionitis may not be feasible in the near future, attempts to decrease neonatal risk factors such as severe cranial ultrasound abnormalities and sepsis may be most feasible at this time.

Key words: cerebral palsy, neurologic impairment, perinatal correlates, very low birth weight, magnesium.




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