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Updated: Aug 15, 2026
The Hypoxic Ischemic Encephalopathy Model of Perinatal Ischemia
Published on: November 19, 2008
Rolandic type cerebral palsy in children as a pattern of hypoxic-ischemic injury in the full-term neonate
A I Maller1, L L Hankins, J W Yeakley
1Department of Neurology, University of Texas-Houston, Medical School, 77030, USA.
Insights
Hypoxic-ischemic brain injury in term neonates can cause a specific type of cerebral palsy. This pattern of injury, seen on brain MRIs, is linked to active myelination during development.
Area of Science:
- Neuroscience
- Pediatric Neurology
- Medical Imaging
Background:
- Cerebral palsy (CP) is a group of disorders affecting movement and posture, often stemming from brain damage before, during, or shortly after birth.
- Hypoxic-ischemic (HI) encephalopathy is a significant cause of brain injury in neonates, particularly those born at term.
- Understanding the specific patterns of brain injury and their correlation with clinical outcomes is crucial for diagnosis and management.
Observation:
- Magnetic resonance images (MRIs) of 11 patients (1 week to 12 years) with a distinctive CP pattern were analyzed.
- Lesions were predominantly in bilateral perirolandic cortical/subcortical regions, often involving basal ganglia and thalami.
- Clinical review correlated perinatal asphyxia with spastic quadriparesis, speech impairment, and cognitive delays in older children.
Findings:
- The observed pattern of HI brain injury correlates with metabolically active areas of primary myelination in term neonates.
- This injury pattern does not align with typical arterial border zones or single cerebral artery territories.
- Brain maturity and regional metabolic rates during myelination are key determinants of HI injury extent.
Implications:
- This study identifies a specific type of cerebral palsy that may serve as a hallmark of hypoxic-ischemic injury in term neonates.
- Findings support the role of myelination susceptibility in determining the severity and pattern of neonatal brain injury.
- Results confirm and extend previous neuropathological and neuroimaging data on asphyxiated neonates.
Abstract:
Magnetic resonance images (MRIs) of the brains of 11 patients aged from 1 week to 12 years with a distinctive type of cerebral palsy were selected based on distribution of cerebral lesions, which were restricted to bilateral perirolandic cortical and subcortical regions, including frequent symmetric involvement of basal ganglia and ventrolateral nucleus of thalami. Retrospectively, the perinatal history and clinical features were reviewed to correlate clinical data with this distinctive pattern of brain injury. Clinically affected neonates had an encephalopathy associated with a severe perinatal asphyxial event. Older children with cerebral palsy survived a similar perinatal course and demonstrated spastic quadriparesis with bulbar or pseudobulbar involvement, lack of verbal speech and variable delays in cognitive development. The distribution of hypoxic-ischemic lesions involving bilateral perirolandic regions, basal ganglia, and thalami, appears to correlate with increased metabolic areas of primary myelination in full-term neonates, but not with arterial border zones nor a single cerebral artery distribution. Myelination is a critical process in maturing brain associated with marked increase in tissue respiration and thus greater susceptibility to oxygen deprivation. It is believed that the extent of hypoxic-ischemic brain injury is determined principally by brain maturity and regional metabolic rates at time of insult and this correlates with active myelination in full-term neonates. This study confirms previous data from neuropathologic literature and recent reports of neuroimaging studies of asphyxiated neonates. In addition, retrospective analysis of the clinical data enables recognition of a type of cerebral palsy that might be the hallmark of hypoxic-ischemic injury in term neonates.
