1-1-05. Electroencephalographic diagnosis of prion disease in Japanese CJD surveillance

The electroencephalographic finding of periodic synchronous discharges (PSDs) is a basic clue for the diagnosis of Creutzfeldt-Jacob disease (CJD). We proposed grading of PSDs. We defined grade A as typical PSDs, grade B as PSDs of relatively longer periodic intervals, grade C as PSDs of relatively rare appearance, grade D as PSDs of rudimentary appearance, and grade E as absent PSDs. The occurrence rate of PSDs in Japanese CJD surveillance was 62% in total CJD (490/794), 72% in sporadic CJD (441/610), 24% in genetic CJD (41/171), and 61% in dura CJD patients (8/13).

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