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Factors that Increase Risk of Recurrent Seizure
after first Seizure

bulletAbnormal neurologic findings
bulletStructural brain lesion on imaging study
bulletAbnormal EEG
bulletPresence of Spikes on EEG after first seizure: 50-90% chance of recurrent seizure
bulletNo paroxysmal discharge: 12 to 25% chance of recurrent seizure
bulletElderly
bulletFirst 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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