In addition, the diagnostic value of sleep EEG is high. However, some reports indicate that the more EEG examinations are repeated, the higher is the epileptic discharges detection rate on EEG 3). Regarding the question of how many EEG examinations are needed to exclude a diagnosis of epilepsy, there is no solid evidence-based answer. In a systematic review of 12 articles with evidence levels of classes I and II comprising 1,766 adult patients, approximately 50% of the patients with epilepsy had normal EEG 2). However, in a considerable number of patients, seizure discharges cannot be detected by a single routine EEG examination. Regarding the EEG recording methods, it is desirable to follow the guidelines of the Japanese Society of Clinical Neurophysiology 1). Thus, EEG findings are essential in addition to clinical seizure types and neurological symptoms. ![]() CommentÄiagnosis of epilepsy is conducted in accordance with the International League Against Epilepsy (ILAE) classification of epileptic seizure types (1981) as well as classification of epilepsies, epileptic syndromes and related seizure disorders (1989). In a considerable number of patients, however, epileptic discharges cannot be detected by only a single routine EEG examination, and multiple EEG recordings including sleep or sleep-deprived EEG are required. How useful is EEG for the diagnosis of epilepsy? SummaryÄ®lectroencephalography (EEG) is the most useful clinical examination for the diagnosis of epilepsy.
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