P-EG003. Electroencephalography (EEG) abnormalities pattern in brain tumor and stroke

Abstract

Introduction . Electroencephalography (EEG) is commonly used to identify epileptiform discharge confirming the diagnosis of epilepsy. However, EEG is rarely used in brain tumor and stroke patients. The EEG abnormalities in brain tumor and stroke patients are not well determined. Aim: To identify the EEG abnormalities pattern in brain tumor and stroke patients. Methods . Thirty-seven brain tumor patients and 28 stroke patients, during their hospitalization in general neurology ward and stroke unit, underwent the EEG examination at Electromedical Clinic in Sardjito Hospital, Yogyakarta, Indonesia. Results . EEG abnormal result was found in 32 (86.5%) brain tumor patients and 20 (71.4%) stroke patients. The most common type was the abnormalities of both epileptiform discharge and background. It was found in 19 (51,4%) brain tumor and 9 (32,1%) stroke patients. The second common type was the abnormality of background only; 5 (13,5%) brain tumor and 6 (21,4%) stroke patients. More than a half of brain tumor (73%) and stroke (53,6%) patients showed the existence of epileptiform discharge; dominated by sharp wave. The existence of epileptiform discharge may reveal the possibility of functional brain lesion; meanwhile the existence of background abnormality may reveal the possibility of structural brain lesion. Conclusion . EEG in brain tumor and stroke patients showed the same abnormalities pattern, which is the abnormalities of epileptiform discharge and background. It may suggest that there are both structural and functional brain lesions in brain tumor and stroke cases.