The semiology of febrile seizures: Focal features are frequent

- The semiology of febrile seizures (FS) is widely different among children.
- The seizure symptoms suggestive of focal onset are frequently observed in FS.
- One-third of children with FS had symptoms suggestive of limbic onset.

ObjectiveTo clarify the semiology of febrile seizures (FS) and to determine the frequency of FS with symptoms suggestive of focal onset.MethodsFS symptoms in children were reported within 24 h of seizure onset by the parents using a structured questionnaire consisting principally of closed-ended questions. We focused on events at seizure commencement, including changes in behavior and facial expression, and ocular and oral symptoms. We also investigated the autonomic and motor symptoms developing during seizures. The presence or absence of focal and limbic features was determined for each patient. The associations of certain focal and limbic features with patient characteristics were assessed.ResultsInformation was obtained on FS in 106 children. Various events were recorded at seizure commencement. Behavioral changes were observed in 35 children, changes in facial expression in 53, ocular symptoms in 78, and oral symptoms in 90. In terms of events during seizures, autonomic symptoms were recognized in 78, and convulsive motor symptoms were recognized in 68 children. Focal features were evident in 81 children; 38 children had two or more such features. Limbic features were observed in 44 children, 9 of whom had two or more such features. There was no significant relationship between any patient characteristic and the numbers of focal or limbic features.SignificanceThe semiology of FS varied widely among children, and symptoms suggestive of focal onset were frequent. FS of focal onset may be more common than is generally thought.