What are the risk factors for recurrence of epileptic seizures?

Updated: May 30, 2019
  • Author: David Y Ko, MD; Chief Editor: Selim R Benbadis, MD  more...
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Answer

For patients who have had more than 1 unprovoked seizure, treatment with an anticonvulsant is recommended. However, the standard of care for a single unprovoked seizure is avoidance of typical precipitants (eg, alcohol, sleep deprivation); anticonvulsants are not recommended unless the patient has risk factors for recurrence.

The risk of recurrence in the 2 years after a first unprovoked seizure is 15-70%. Principal factors that increase the risk of recurrence are an abnormal brain magnetic resonance image (MRI) study, an abnormal electroencephalogram (EEG), and a partial-onset seizure.

On brain magnetic resonance imaging (MRI), a focal abnormality in the cortical or limbic regions that indicates a possible substrate for an epileptogenic zone is the finding that most often suggests increased risk for seizure recurrence. Diffuse abnormalities, such as hydrocephalus, may increase the risk by injuring the cerebral cortex.


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