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Updated: Apr 17, 2026
Early Pathological and Magnetic Resonance Detection of Cerebral Injury Using a Rat Model of Neonatal Hypoxic Ischemic Encephalopathy
Published on: October 28, 2022
Cognitive outcomes after neonatal encephalopathy
Athina Pappas1, Seetha Shankaran2, Scott A McDonald3
1Department of Pediatrics, Wayne State University, Detroit, Michigan; apappas@med.wayne.edu.
Insights
Neonatal encephalopathy can lead to cognitive impairment in children, even those without cerebral palsy (CP). Early developmental testing helps predict long-term IQ, highlighting the need for ongoing support services.
Area of Science:
- Neuroscience
- Developmental Pediatrics
- Public Health
Background:
- Neonatal encephalopathy (NE) is a serious condition affecting newborns.
- Cognitive outcomes in survivors of NE, particularly those with cerebral palsy (CP), require thorough investigation.
- Understanding the long-term impact of NE on cognitive development is crucial for early intervention.
Purpose of the Study:
- To characterize the range of cognitive outcomes in children with and without CP following NE.
- To assess the predictive accuracy of early developmental assessments for later cognitive function.
- To document the utilization of school services and additional therapies in this population.
Main Methods:
- School-aged survivors from a randomized controlled trial of whole-body hypothermia were evaluated.
- Participants underwent neurological examinations and cognitive testing at 18-22 months (Bayley Scales) and 6-7 years (Wechsler scales, DNP).
- Parental interviews gathered data on functional status and access to educational/support services; multiple regression models identified outcome predictors.
Main Results:
- Over a quarter of children exhibited subnormal IQ scores; 96% of those with CP had IQ <70, while 9% without CP also scored <70.
- Children with a Mental Developmental Index <70 at 18 months had significantly lower adjusted IQs at 6-7 years (average difference of 42 points).
- Educational support or grade repetition was utilized by 20% of children with normal IQ and 28% with IQ scores of 70-84.
Conclusions:
- Cognitive impairment is a significant and persistent concern for all children who have experienced neonatal encephalopathy.
- Early developmental assessments show prognostic value for long-term cognitive outcomes.
- A substantial proportion of children, including those with seemingly normal or borderline IQ, require educational support services.
Objectives:
To describe the spectrum of cognitive outcomes of children with and without cerebral palsy (CP) after neonatal encephalopathy, evaluate the prognostic value of early developmental testing and report on school services and additional therapies.
Methods:
The participants of this study are the school-aged survivors of the National Institute of Child Health and Human Development Neonatal Research Network randomized controlled trial of whole-body hypothermia. Children underwent neurologic examinations and neurodevelopmental and cognitive testing with the Bayley Scales of Infant Development-II at 18 to 22 months and the Wechsler intelligence scales and the Neuropsychological Assessment-Developmental Neuropsychological Assessment at 6 to 7 years. Parents were interviewed about functional status and receipt of school and support services. We explored predictors of cognitive outcome by using multiple regression models.
Results:
Subnormal IQ scores were identified in more than a quarter of the children: 96% of survivors with CP had an IQ <70, 9% of children without CP had an IQ <70, and 31% had an IQ of 70 to 84. Children with a mental developmental index <70 at 18 months had, on average, an adjusted IQ at 6 to 7 years that was 42 points lower than that of those with a mental developmental index >84 (95% confidence interval, -49.3 to -35.0; P < .001). Twenty percent of children with normal IQ and 28% of those with IQ scores of 70 to 84 received special educational support services or were held back ≥1 grade level.
Conclusions:
Cognitive impairment remains an important concern for all children with neonatal encephalopathy.
