[Influence of age at onset, age and duration of illness on cognitive abilities in patients with refractory epilepsy].

This retrospective study was performed as part of the controversial discussion whether increasing cognitive deficits in patients with refractory epilepsy are mainly an effect of normal aging or caused by epilepsy related noxious events during the course of an intractable epilepsy. Neuropsychological data and information about the course of the disease from 146 patients with refractory epilepsy were available. There were significant correlations between the age at onset and premorbid intelligence, duration of disease and fluid intelligence and age and difference between premorbid intelligence and fluid intelligence as a measure of cognitive deterioration. Discussing these results we conclude that beneath a clear effect of normal aging on cognitive deterioration there is probably a small effect of the refractory course of the epilepsy, which might be mediated by the number of seizures. Additionally we would like to encourage early cognitive screening and rehabilitation programmes for patients with epilepsy to minimize the effect of the age of onset on the level of education or premorbid intelligence.