[Studies of the correlations between morphological brain changes on MRI and computerized EEG changes in schizophrenics].
Several researchers have investigated the relationships between computed tomographic and electroencephalographic abnormalities in schizophrenics. In this present investigation, 28 medicated schizophrenic patients fulfilling the DSM-III-R criteria for schizophrenia and 21 normal volunteers were studied by means of MRI and EEG examinations. All subjects had given informed consent to the investigation. The schizophrenic patients (14 males, 14 females) were aged from 21 to 39 with a mean age of 30.2. The control group consisted of age- and sex-matched healthy volunteers (11 males, 11 females) with no history of neurological disease or head trauma. All the subjects were right-handed as determined by the Edinburgh Inventory. Schizophrenic and control subjects underwent MRI scan and EEG within two weeks. Three trained psychiatrists evaluated patients for BPRS and SANS and the score each item was the median of the three raters. MRI scans were performed by a Asahi Super 200 scanner operating at a 2.0 Tesla magnetic field. A midsagittal scan (8 mm thickness, Spin Echo 500/26) was taken. Subsequently, 15 axial and coronal slices of 5 mm interslice with 2 mm gap were obtained using an Inversion-Recovery sequence (TR: 3000, TI: 800, TE: 14). For measurement purposes, the three MRI scans (Fig-1) were recorded on transparent film, and the boundaries of the cerebral structures were taken traced from the film onto a digitizing tablet. The EEGs were recorded from 16 scalp electrodes of the standard 10/20 system referenced to linked ear electrodes at rest and digitized by a topographic system (Neuromap system MCE-5100, QCE-510B, Nihon Kohden). To calculate EEG power, the frequency spectrum was divided into six EEG frequency bands by 0.25 Hz bands. Each power value was taken from the average percentage of total power and then log-transformed. Schizophrenic patients showed a significantly larger VBR on the axial and coronal planes than control subjects. The areas of the bilateral anterior horns, left body, left posterior horn of the lateral ventricle and the third ventricle were significantly larger in schizophrenic patients than in control subjects. The area of middle half of the corpus callosum in schizophrenic patients was smaller than in control subjects. Schizophrenic patients showed more delta and theta activities in the centro-parieto-occipital regions than control subjects. Schizophrenic patients also showed more beta 1 and beta 2 activities in front-central regions than control subjects. On the other hand, schizophrenic patients showed a markedly decrease in alpha 2 activity in all regions.(ABSTRACT TRUNCATED AT 400 WORDS)
Takeuchi
K
K
Department of Neuropsychiatry, Faculty of Medicine, Kagoshima University.
D000328:Adult; D001921:Brain / Q000473:pathology*; D004569:Electroencephalography / Q000295:instrumentation*; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D012559:Schizophrenia / Q000175:diagnosis*