期刊
DEVELOPMENTAL BRAIN RESEARCH
卷 154, 期 1, 页码 45-55出版社
ELSEVIER
DOI: 10.1016/j.devbrainres.2004.10.002
关键词
disorders of the nervous system; ischemia; cerebral ischemia; fetal sheep; preterm brain injury; cortical injury; white matter injury; spectral edge frequency; electroencephalogram
资金
- EUNICE KENNEDY SHRIVER NATIONAL INSTITUTE OF CHILD HEALTH &HUMAN DEVELOPMENT [R01HD032752] Funding Source: NIH RePORTER
- NICHD NIH HHS [R01-HD32752] Funding Source: Medline
Suppression of electroencephalogram (EEG) spectral edge (SE) is a suggested marker for preterm white matter (WM) injury; however, there are few specific data. We examined the relationship between SE and EEG intensity and white and grey matter injury after a severe ischemic insult, induced by 30 min carotid occlusion (n=10) compared with sham-control (n=7) in preterm fetal sheep at 95-96 days of gestation (term=147 days). Fetuses were instrumented with a microdialysis probe placed within the left periventricular region and with EEG probes over the parietal cortex bilaterally. Fetuses that showed only brief suppression of the EEG during bilateral carotid occlusion (Mild group, n=4) were compared with those who exhibited persistent suppression (Severe group, n=6). After 72 h recovery, the severe ischemia group showed parasagittal cortical neuronal loss accompanied by diffuse WM damage in the right hemisphere, whereas the mild group showed little or no neuronal loss, either with (n=2) or without diffuse (n=2) WM damage. Left sided focal periventricular WM infarction corresponding with probe placement was seen in all groups. EEG intensity and SE were profoundly suppressed in the severe group, with only partial recovery after 72 h (P<0.01), in contrast with transient suppression in the mild group. There was no difference in baseline SE values or post-ischemic responses between the left and right hemisphere. These findings suggest that persistent suppression of EEG SE is primarily a consequence of cortical grey matter injury. (C) 2004 Elsevier B.V. All rights reserved.
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