3264 consecutive routine EEG were reviewed to determine the prevalence of epileptiform abnormalities. Epileptiform activity occurred in 117 out of 527 unselected EEGs of epileptic patients (22,2%) and in 96 out of 2737 EEGs of other categories of patients (3,6%). Patients with 'definite' epilepsy had highest prevalence rates (29,39%); the overall prevalence of abnormalities in this group, including 'slow' abnormalities, was 55,2%. The chance of epileptiform activity was increased in EEG reports of epileptic with 'mixed' seizures (56,2% of cases), with frequent seizures (65% of cases with more than 5 seizures/year), and, furthermore, in young patients between 5 and 19 (48,7% of cases). We can conclude that in a EEG laboratory with unselected afferences the routine EEG evaluated for epileptiform patterns shows a good 'specificity' (96,4%) and a moderate 'sensibility'. In other words, the false-positive rate is small, whereas the false-negative rate is quite high.
|Title of host publication||Bollettino - Lega Italiana contro l'Epilessia|
|Number of pages||3|
|Publication status||Published - 1988|
ASJC Scopus subject areas
- Clinical Neurology