Abstract
Scalp electroencephalograms (EEGs) of brain dead patients are macroscopically flat under 7 or 10 μV/mm electroencephalograph sensitivity, but significant noises are detected in EEGs under 2 μV/mm sensitivity, interfering with the analysis. EEGs of 20 brain dead patients (17−76 years old) were therefore analyzed quantitatively as equivalent electric potentials in frequency bands δ, θ, α and β using the automatic EEG analysis system developed in Kansai Medical University. The equivalent electric potentials in each band were about or less than 1 μV, which is used as a criterion of judgment of flat-line EEGs or brain death. Then, macroscopically flat EEGs of 12 comatose patients including infants (3−67 years old) were analyzed by the system, confirming their brain death. Thus, the automatic EEG analysis system could be used as a supporting tool to confirm flat-line EEGs of brain dead patients. ATAMAP II for Windows software was also evaluated.
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