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Relevance of computerized electroencephalographic topography (brain mapping) in ischemic stroke
L Pinheiro1, A K Roy, G R K Sarma
1Department of Neurology, St. John's Medical College and Hospital, Bangalore 560-034, India.
Neurology India
|October 23, 2003
Summary
Brain mapping detected abnormalities in 95% of ischemic stroke patients, significantly more than conventional EEG (40%). This advanced technique shows promise for stroke assessment.
Area of Science:
- Neuroscience
- Medical Imaging
- Neurology
Background:
- Computerized electroencephalographic topography (CET), or brain mapping, is a non-invasive method to visualize EEG patterns.
- It uses a 2D color-coded display of amplitude and frequency.
Purpose of the Study:
- To investigate the relationship between CT scan lesions, conventional EEG, and brain mapping in ischemic stroke patients.
- To compare the sensitivity of brain mapping versus conventional EEG in detecting stroke-related abnormalities.
Main Methods:
- Prospective study of 40 ischemic stroke patients within one week of onset.
- CT scans, conventional EEG, and brain mapping were performed.
- EEG and brain mapping were conducted within 24 hours of CT scans.
Main Results:
- Brain mapping identified abnormalities in 95% of patients, compared to 40% with conventional EEG.
- Abnormalities were most commonly low-frequency, high-amplitude changes.
- Brain mapping findings correlated with CT lesion size and location, being ipsilateral for smaller lesions (<2 cm) and bilateral for larger lesions (>2 cm).
Conclusions:
- Brain mapping is more sensitive than conventional EEG in detecting abnormalities in ischemic stroke.
- No correlation was found between motor deficits and brain map abnormalities.