Seizure classification
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]
Overview
Classification
There are many types of seizures. These can be classified into two broad groups:
- Primary generalized seizures—seizures begin with widespread involvement of both sides of the brain. Generalized seizures are divided according to the effect on the body, but all involve loss of consciousness. These include absence, myoclonic, clonic, tonic, tonic–clonic, and atonic seizures.
- Partial seizures—seizures begin with involvement of a smaller, localized area of the brain. With some partial seizures, the disturbance can still spread within seconds or minutes to involve widespread areas of the brain (secondary generalized seizure). Partial seizures are further divided on the extent to which consciousness is affected (simple partial seizures means consciousness unaffected, and complex partial seizures means consciousness is affected).