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• W2024163920 abstract "1. Serial examinations were carried out of the EEG under light Thiopentone anaesthesia in 42 patients receiving ECT. Twenty-two of the patients were studied at regular intervals before, during and after ECT. 2. A transformation of the Thiopentone EEG was observed at an early stage of treatment, when the routine record showed no change in the majority of cases. The typical response was fully developed in most cases after the third treatment and not seen in pre-ECT Thiopentone records. It consisted of a highly rhythmic, frontally predominant, bilaterally synchronous, paroxysmal, high voltage delta discharge at 2 – 3 c/s lasting 100 – 200 sec. 3. This slow discharge was followed by a quiescent stage in which rhythmic slow activity was absent from the record, even where it had been prominent in the routine EEG. Reasons are adduced for regarding this flattening as the result of an inhibitory process. 4. Some evidence has been obtained pointing to a relationship between the EEG and clinical changes. There is also a suggestion that an atypical EEG is associated with a poor therapeutic result. 5. The fact that Thiopentone revealed latent changes in the EEG before and after the changes in the routine record, and when the latter showed no alteration at any stage, is held to indicate that the primary effects of ECT are on diencephalic structures. The characteristics of the change suggest an influence in a midline structure with access to all cortical areas, though with a special functional relationship to the frontal lobes. Some part of the thalamus of man homologous with the diffuse projection system studied by Morison and Dempsey, and Jasper may be the region affected. 6. Sensory stimulation in the quiescent stage evokes changes in the EEG that are interpreted as an afferent after-discharge. Its characteristics are held to confirm the interpretation of the findings stated. 7. Reasons are put forward for regarding the total changes produced by ECT as a biologically purposive response of the homeostatic centres of the brain, which tends to restore the most stable pattern of cerebral and somatic functions hitherto attained. 8. The effectiveness of ECT in a diversity of disorders suggests a selective action on recently acquired behaviour patterns. The end result of a long course of treatment may be described as a dedifferentiation of cerebral activity. It is possible that such a change may reverse the subtle changes in the brain associated with these behaviour trends of recent origin." @default.
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• W2024163920 date "1951-08-01" @default.
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• W2024163920 title "Changes in the EEG under barbiturate anaesthesia produced by electro-convulsive treatment and their significance for the theory of ECT action" @default.
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