Topographic EEG mapping in cerebrovascular disease

Area of Science:

• Neuroscience
• Medical Imaging
• Neurology

Background:

• Cerebral infarction, or stroke, significantly impacts brain function.
• Assessing cerebral blood flow (CBF) and cerebral metabolic rate of oxygen (CMRO2) is crucial for understanding stroke-related brain changes.
• Electroencephalography (EEG) provides insights into brain electrical activity.

Observation:

• Topographic EEG power spectral data were analyzed in patients with cerebral infarction.
• Positron emission tomography (PET) was used to measure cortical CBF and CMRO2 in the same patients.
• Correlations between specific EEG frequency bands (delta, theta, alpha) and hemodynamic/metabolic parameters were investigated.

Findings:

• Delta and theta EEG activities showed a negative correlation with CBF and CMRO2.
• Alpha EEG activity demonstrated a positive correlation with CBF and CMRO2.
• Both absolute power (AP) and relative power (RP) of delta activity correlated significantly with CBF and CMRO2.
• Relative power (RP) of alpha activity exhibited a closer correlation with CBF and CMRO2 compared to absolute power (AP).
• Z-scores of EEG power data also correlated significantly with PET data, though they did not enhance the correlation degree.
• Topographic EEG maps (AP, RP, z-score) visually corresponded well with PET images.

Implications:

• Topographic EEG power spectral analysis can serve as a non-invasive method to assess functional changes in cerebral infarction.
• The findings suggest that specific EEG frequency band alterations reflect underlying hemodynamic and metabolic disturbances in stroke.
• Z-score maps of EEG power data may be a valuable tool for topographical analysis and feature extraction in clinical neurophysiology.
• This correlation provides a basis for using EEG as a complementary tool to PET in evaluating stroke patients.