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Hypoxic-ischemic encephalopathy in areas of primary myelination: a neuroimaging and PET study
B Azzarelli1, K S Caldemeyer, J P Phillips
1Department of Pathology, Indiana University School of Medicine, Indianapolis, USA.
Insights
Hypoxic-ischemic brain lesions in neonates are linked to developmental stage. Areas with higher oxygen-glucose utilization showed the most damage in term newborns.
Area of Science:
- Neuroscience
- Developmental Biology
- Neonatal Medicine
Background:
- Perinatal hypoxic-ischemic (HI) injury is a major cause of neurological deficits.
- The distribution of brain lesions in perinatal HI is not fully understood.
- Regional development of the central nervous system (CNS) may influence lesion patterns.
Purpose of the Study:
- To describe the pattern of brain lesions in perinatal HI.
- To investigate the relationship between CNS developmental stage and lesion distribution.
- To test the hypothesis that areas with higher oxygen-glucose utilization are more vulnerable.
Main Methods:
- Case series of 12 patients with perinatal HI.
- Clinical data including gestational age and age at death.
- Autopsy findings describing brain lesions.
- Review of positron emission tomography (PET) studies on neonatal brain metabolism.
Main Results:
- Cerebral cortical damage was primarily in areas of primary myelination and adjacent white matter.
- Thalamic, basal ganglia, brainstem, and spinal cord damage were also observed.
- Lesion distribution correlated with areas of high oxygen-glucose utilization in the neonatal brain, following a phylogenetic pattern.
Conclusions:
- The developmental stage of the CNS is a critical determinant of lesion distribution in perinatal HI.
- Areas with higher metabolic activity (oxygen-glucose utilization) are selectively vulnerable during hypoxic-ischemic insults.
- This understanding can inform strategies for predicting and potentially preventing brain injury in neonates.
Abstract:
The stage of regional structural and biochemical development of the central nervous system appears as a critical factor determining the distribution of hypoxic-ischemic lesions during the perinatal period. We describe the brain lesions in 12 patients who suffered hypoxia-ischemia during the perinatal period. The gestational age ranged from 35 to 42 weeks and the age at death from 2 to 16 weeks. There is one patient alive at age 18 years and a second patient at age 1 year. The cerebral cortical damage is mainly restricted to areas of primary myelination and adjacent subcortical white matter. In addition, there is thalamic, basal ganglia, brainstem, and spinal cord damage. It is postulated that selective damage occurs in those areas which at the moment of the hypoxic-ischemic insult had achieved higher rates of oxygen-glucose utilization. This hypothesis is supported by studies utilizing positron emission tomography which indicates that glucose utilization in the normal human neonatal brain follows a phylogenetic order. Regions that achieved higher levels of glucose consumption are those that suffered the brunt of the damage in our term neonates.