Unit
- Seizure definition: A seizure is a transient occurrence of signs or symptoms due to abnormal excessive or synchronous neuronal activity in the brain. This electrical disturbance can manifest as altered consciousness, motor movements, sensory changes, or behavioral automatisms. Understanding this fundamental definition is essential for distinguishing seizures from other paroxysmal events such as syncope or psychogenic nonepileptic seizures.
- International League Against Epilepsy classification: Seizures are classified into focal onset, generalized onset, and unknown onset based on where the abnormal activity begins. Focal seizures originate in one hemisphere and may be aware or impaired awareness. Generalized seizures involve both hemispheres from onset and include absence, tonic-clonic, myoclonic, atonic, and clonic types.
- Focal aware seizures: These occur without loss of consciousness and may present with simple motor symptoms like twitching of a limb or sensory symptoms such as tingling or visual changes. The individual remains fully responsive and can describe the experience during and after the event. This subtype is often mistaken for other neurological conditions.
- Focal impaired awareness seizures: Consciousness is affected partially, leading to confusion, automatisms (e.g., lip smacking, picking motions), and unresponsiveness. The person may appear dazed and not recall the event afterward. Duration is typically 30 seconds to 2 minutes. Post-ictal confusion and fatigue are common.
- Generalized tonic-clonic seizures: Characterized by sudden loss of consciousness, stiffening (tonic phase) followed by rhythmic jerking (clonic phase), often with cyanosis and salivation. This type is what most people recognize as a "grand mal" seizure. It typically lasts 1-3 minutes and requires careful first response to prevent injury.
- Absence seizures: Brief episodes of staring and impaired awareness lasting 5-10 seconds, commonly seen in children. There is no post-ictal confusion and the individual resumes activity immediately. These can occur dozens of times per day and are often mistaken for daydreaming or inattention in school settings.
- Myoclonic and atonic seizures: Myoclonic seizures involve sudden, brief shock-like jerks of a muscle group, often bilaterally. Atonic seizures cause sudden loss of muscle tone, leading to drop attacks that can cause head or facial injuries. Both types are associated with specific epilepsy syndromes and require tailored safety planning.
- Unknown onset seizures: When the beginning of a seizure is not observed or determined, it is classified as unknown onset. This can later be reclassified as focal or generalized if more information becomes available. Documentation should note the uncertainty to guide further diagnostic evaluation.
Scope of Practice
Role: Epilepsy Support Coordinator in Community Health Setting
Within scope:
- Educating patients and families about seizure types and classification using approved materials.
- Documenting seizure descriptions provided by observers or individuals to assist clinical teams.
- Recognizing common seizure patterns to trigger appropriate referral for diagnostic workup.
- Using standardized seizure classification terminology in reports and care plans.
Outside scope:
- Diagnosing seizure type or epilepsy syndrome without physician oversight.
- Interpreting EEG or neuroimaging results independently.
- Differentiating epileptic from nonepileptic events without direct medical input.
- Prescribing or adjusting antiseizure medications.
Quick Revision
- Seizures are transient abnormal brain electrical activity with diverse manifestations.
- Classification focuses on onset location: focal, generalized, or unknown.
- Focal aware seizures preserve consciousness; focal impaired awareness alters it.
- Generalized tonic-clonic seizures involve stiffening and jerking; absence seizures involve brief staring.
- Myoclonic and atonic seizures are distinct with specific management needs.
- Support coordinators educate and document but do not diagnose.