The electroencephalogram in psychiatry.
نویسنده
چکیده
AT present the interpretation of electroencephalograms is necessarily an empirical process. Whenever interpretation is attempted, a prediction is made which is entirely a matter of probability. It is rarely possible therefore to state with confidence that a particular pattern is diagnostic of any specific clinical entity. Seldom is it advisable to claim more than that the EEG findings support or fail to support the diagnosis suggested by the clinician. In many conditions-and this is particularly true of psychiatric disorders-the incidence of abnormal records is relatively low and the finding of a normal EEG does nothing to exclude the possibility of such an illness. Only in a few conditions, such as cerebral abscess or subacute progressive encephalitis, is the incidence of abnormality so high that the finding of a normal EEG virtually rules out its existence. The request made by so many clinicians to the electroencephalographer, to exclude a certain condition, is on the whole an unreasonable one. Apart from the fact that normal EEG findings are frequent in the presence of indisputable disease, the repertoire of the EEG is very limited :so that specific patterns of abnormality are consequently rare. The same appearances are com-monly produced by a variety of conditions of widely differing atiology, and it is a dangerous practice to attempt to correlate EEG abnormalities with specific pathologies. In psychiatry the position is made even more difficult by our limited knowledge of etiological factors and by lack of agreement on such matters as classification.
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ورودعنوان ژورنال:
- Postgraduate medical journal
دوره 39 شماره
صفحات -
تاریخ انتشار 1963