| Type | Definition |
| Seizure | - Sudden change in behavior due to increased electrical activity in cerebral cortex
|
| Acute symptomatic seizure | - Seizure due to systemic injury
- Examples include metabolic derangements, drug or alcohol withdrawal
- Seizure due to documented brain injury
- Examples include stroke, encephalitis, head injury
|
| Unprovoked seizure | - Seizure due to known preexisting brain lesion, progressive nervous system disorder, or an unknown etiology
|
| Epilepsy | - > 2 unprovoked seizures > 24 hours apart
- At least 1 unprovoked seizure with high risk for future seizures over the next 10 years due to the underlying etiology
|
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