Factors that Increase Risk of Recurrent Seizure
after first Seizure
Abnormal neurologic findings
Structural brain lesion on imaging study
Abnormal EEG
Presence of Spikes on EEG after first seizure: 50-90% chance of recurrent seizure
No paroxysmal discharge: 12 to 25% chance of recurrent seizure
Elderly
First degree relative has epilepsy
van Donselaar et al reported in 1992: prospective study of adults following an isolated idiopathic seizure
EEG findings
Chance of recurrent seizure
with epileptiform discharge
64%
non epileptiform abnormality
41%
normal EEG
22%
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