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Periodic lateralized epileptiform discharges (PLEDs) following stroke are associated with metabolic abnormalities.
PLEDs are an electroencephalographic phenomenon consisting of high voltage stereotyped periodic transients distributed over one hemisphere, associated with acute or subacute structural lesions as well as with metabolic abnormalities. We have evaluated the contribution of metabolic factors in patients with acute hemispheric stroke. Temperature, serum electrolytes, glucose, kidney and liver function tests were examined in two groups of 14 patients each following acute hemispheric stroke differing in regard to the appearance of PLEDs in the EEG. CT features of the infarcts were also compared. Patients with PLEDs had more metabolic derangements as compared to patients with no PLEDs (Mann-Whitney ranking test P = 0.01). Hyperglycemia and fever were significantly associated with PLEDs (logistic regression model, P < 0.05). There was no significant difference regarding radiological findings between the two groups. We conclude that acute stroke as a structural lesion predisposes to PLEDs but the latter may be triggered by metabolic disturbances, mainly hyperglycemia and fever.
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