The REG technique permitting an estimation of the grey matter flow was applied in conjunction with the simultaneous recording of the EEG analysed by the SULG manual method with 21 normal adult subjects. A relationship was established between the REG index and the EEG frequency index in a resting situation with eyes closed. An increase of the REG index was observed when the eyes were open, for looking at a picture and during a test of visual attention. At opening of the eyes a delay is observed between the desynchronisation of the EEG and the increase of the REG.
Cerebral blood flow variation patterns have been studied in 20 control subjects and in 30 schizophrenics. This study demonstrates ‘hypofrontality’ in schizophrenics and their lack of reactivity to strong verbal and somesthetic stimulations.
Ten cases of cerebrovascular accidents have been studied by rheoencephalography. The REG curves are interpreted quantitatively and our method gives a measure of the regional circulatory resistance but also of another parameter that we call the ‘reserve’. With this last value, measured before an injection of 100 mg of papaverine pyridoxinate, we can predict in which direction the regional circulatory resistance will vary 10 min after the injection of papaverine pyridoxinate. The study of our results shows that an infarcted or ischaemic territory has a low reserve value and that a therapeutic effect is characterized by a ‘squeeze effect’.
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