Relevance of computerized electroencephalographic topography (brain mapping) in ischemic stroke.
OBJECTIVE
Computerized electroencephalographic topography (CET) (brain mapping) is a non-invasive, spatially oriented procedure for depicting amplitude and frequency patterns by two-dimensional color-coded frequency and amplitude display of the electroencephalograph (EEG).


METHODS
We prospectively studied the relationship between CT scan lesions, conventional EEG and brain mapping in 40 patients with ischemic stroke within 1 week of onset. EEG and brain mapping was done within 24 hours of doing CT scan.


RESULTS
There were 32 males and 8 females and the mean age was 56 years (range 27-75 years). CET/EEG was normal in 2 patients with capsular infarct. Brain mapping showed abnormalities (most commonly low-frequency high-amplitude changes) in 95% of patients, whereas EEG abnormalities were seen in only 40%. Brain mapping abnormalities were appropriate to the side of the CT scan lesion in 20 (52.63%) patients and were present bilaterally n 18 (47.37%) patients. Brain mapping abnormalities were ipsilateral to the side of the CT lesion when the lesion was < 2 cm in diameter and they were bi-hemispherical when the CT lesion was > 2 cm in diameter.


CONCLUSIONS
There was no correlation between motor deficits and brain map abnormalities.
Department of Neurology, St. John's Medical College and Hospital, Bangalore 560-034, India.
L
L
Pinheiro
A K
AK
Roy
G R K
GR
Sarma
A
A
Kumar
D000328:Adult; D000368:Aged; D002545:Brain Ischemia / Q000150:complications*; D001931:Brain Mapping / Q000379:methods; D003936:Diagnosis, Computer-Assisted; D004569:Electroencephalography; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D020521:Stroke / Q000175:diagnosis* / Q000209:etiology*