Epilepsy

Epilepsy is a neurological disorder characterized by a lasting predisposition to generate epileptic seizures — brief, excessive electrical discharges in the brain that can cause changes in behavior, movement, sensation, or awareness. A diagnosis of epilepsy is typically made after two or more unprovoked seizures occurring more than 24 hours apart, or after one unprovoked seizure when the risk of recurrence is high.

Epilepsy has many causes and forms, from genetic syndromes beginning in childhood to seizures related to stroke, trauma, or brain tumors in later life. Most people with epilepsy achieve good seizure control with anti-seizure medicines. Surgery, devices, and dietary therapies help selected patients with drug-resistant epilepsy.

Seizure symptoms depend on where in the brain the seizure starts and how it spreads:

• Focal seizures (aware or with impaired awareness) — may include motor automatisms, staring, unusual sensations, emotional changes, or jerking of one limb
• Generalized tonic-clonic seizures — stiffening, rhythmic jerking, loss of consciousness, possible tongue biting and incontinence
• Absence seizures — brief staring spells, mainly in children
• Myoclonic seizures — sudden brief jerks
• Atonic seizures — sudden loss of muscle tone (“drop attacks”)

After a seizure, people may experience confusion, fatigue, muscle soreness, or temporary weakness (Todd’s paralysis). A first seizure requires medical evaluation; prolonged or repeated seizures without recovery (status epilepticus) are a medical emergency.

Causes of epilepsy include:

• Genetic and developmental disorders
• Structural brain lesions (stroke, trauma, tumors, cortical malformations, prior infection or inflammation)
• Infectious causes (neurocysticercosis in endemic areas, encephalitis, meningitis)
• Metabolic and immune-mediated epilepsies
• Unknown (a substantial fraction of cases)

Provoked seizures from acute metabolic disturbance, alcohol withdrawal, or acute brain injury do not by themselves define epilepsy.

Risk factors include family history of epilepsy, prior serious head injury, stroke, brain infection, dementia, developmental brain abnormalities, and certain genetic conditions. Febrile seizures in childhood slightly increase later epilepsy risk in some children.

Possible complications include:

• Injury during seizures (falls, burns, drowning)
• Status epilepticus
• Sudden unexpected death in epilepsy (SUDEP) — rare but higher with frequent generalized tonic-clonic seizures and poor control
• Medication side effects
• Mood disorders, cognitive effects, and social stigma
• Restrictions on driving and certain occupations until seizures are controlled

Not all epilepsy is preventable. Reducing head injury risk (helmets, seat belts, fall prevention), controlling vascular risk factors for stroke, and treating CNS infections promptly help. For people with epilepsy, adherence to medication, adequate sleep, limited alcohol, and avoidance of known personal triggers reduce breakthrough seizures.

Evaluation includes:

• Detailed seizure history from the patient and witnesses
• Neurologic examination
• EEG (routine, sleep-deprived, or prolonged/video-EEG monitoring)
• Brain MRI to look for structural causes
• Blood tests and other studies as indicated to exclude metabolic or genetic causes
• Classification of seizure types and epilepsy syndrome to guide treatment

Seek emergency care for a first seizure, a seizure lasting longer than 5 minutes, repeated seizures without full recovery between them, difficulty breathing, or injury. See a neurologist for evaluation after any unprovoked seizure and for ongoing management of epilepsy.

Anti-seizure medications are first-line; choice depends on seizure type, age, sex, comorbidities, and side-effect profile. Many people achieve control with one medicine; others need combinations.

Drug-resistant epilepsy (failure of two appropriately chosen drugs) warrants referral to a comprehensive epilepsy center for consideration of:

• Epilepsy surgery (resection, laser ablation, disconnection procedures)
• Neurostimulation (vagus nerve stimulation, responsive neurostimulation, deep brain stimulation)
• Dietary therapies (ketogenic diet, modified Atkins diet) especially in certain pediatric syndromes

Rescue medicines (e.g., nasal or rectal benzodiazepines) are prescribed for clusters or prolonged seizures. Counseling on lifestyle, contraception, pregnancy, and SUDEP risk is part of comprehensive care.

Practical steps:

• Take anti-seizure medicine consistently; do not stop abruptly
• Keep a seizure diary
• Prioritize sleep and manage stress
• Limit alcohol; avoid recreational drugs
• Use rescue medication as prescribed
• Take water and height safety precautions if seizures are not fully controlled
• Discuss driving laws and workplace safety with your clinician
• Wear medical identification if advised

Bring:

• A detailed description or video of typical seizures and any triggers
• List of current and past anti-seizure medicines and responses
• Previous EEG and MRI reports
• Family history of seizures
• Questions about medication choices, surgery options, pregnancy, and driving