Characteristics of epilepsy occurring in the first four months.

Introduction: Epilepsies with an onset during the early infantile period are relatively rare and their characteristics are not well recognized. The aim of this study was to determine the clinical characteristics of epilepsies with an onset during the early infantile period.

Methods: Clinical information on 73 patients with the onset of epilepsy within the first four months was collected from hospitals affiliated with Nagoya University. Patients were categorized into three groups: the idiopathic (20 patients), cryptogenic (19 patients), and symptomatic groups (34 patients).

Results: Fourteen (70%) of the 20 patients in the idiopathic group, nine (47%) of the 19 patients in the cryptogenic group, and 10 (29%) of the 34 patients in the symptomatic group had their first seizure within the first month of life. All patients in the idiopathic group, 12 patients (63%) in the cryptogenic group, and 18 patients (53%) in the symptomatic group had partial seizures (PS) alone throughout their clinical course. Four patients in the cryptogenic group and nine in the symptomatic group had PS at the onset, but evolved into spasms later. All patients in the idiopathic group, 13 patients (68%) in the cryptogenic group, and 13 patients (38%) in symptomatic group had experienced no seizures for at least one year at the time of the last follow-up.

Conclusions: In patients with non-idiopathic epilepsy, an age-dependent evolution of seizure types was often observed. Recognition of this subgroup of patients could be important for the identification of appropriate candidates for early epilepsy surgery.