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Epileptic Seizure – Causes, Symptoms and Treatment
An epileptic seizure is a sudden, uncontrolled electrical discharge in the brain that can cause convulsions, loss of consciousness, or other neurological symptoms.
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An epileptic seizure is a sudden, uncontrolled electrical discharge in the brain that can cause convulsions, loss of consciousness, or other neurological symptoms.
What is an Epileptic Seizure?
An epileptic seizure is a brief, usually spontaneous event caused by abnormal, excessive, or synchronized electrical activity of nerve cells in the brain. Symptoms vary widely depending on which area of the brain is affected – ranging from uncontrolled muscle convulsions and loss of consciousness to brief lapses in attention or unusual sensory experiences. When epileptic seizures occur repeatedly and without a clear trigger, the condition is diagnosed as epilepsy.
Causes
Epileptic seizures can have many different causes. A distinction is made between seizures triggered in otherwise healthy individuals and those caused by structural or functional changes in the brain that lead to recurring events.
- Structural causes: Brain injuries, stroke, brain tumors, cerebral malformations
- Genetic causes: Hereditary changes in ion channels or neural network function
- Metabolic causes: Low blood sugar (hypoglycemia), electrolyte imbalances, liver or kidney failure
- Infections: Meningitis, encephalitis
- Provoked seizures: Sleep deprivation, fever (febrile seizures in children), alcohol or drug use
- Idiopathic causes: No identifiable cause; genetic predisposition suspected
Symptoms
The symptoms of an epileptic seizure depend strongly on which part of the brain is involved. Several seizure types are distinguished:
Focal Seizures
Focal (also: partial) seizures begin in a specific area of the brain. They may occur with or without impairment of consciousness. Possible symptoms include:
- Twitching of one side of the body or individual limbs
- Tingling or numbness
- Olfactory or gustatory hallucinations
- Automatisms (e.g., lip-smacking, fidgeting)
Generalized Seizures
Generalized seizures involve both hemispheres of the brain from the outset. Well-known types include:
- Tonic-clonic seizure (Grand Mal): Sudden loss of consciousness, stiffening of the body (tonic phase), followed by rhythmic jerking (clonic phase)
- Absence seizure: Brief episodes of staring or inattentiveness, usually only a few seconds, typically without falling
- Myoclonic seizure: Brief, lightning-like muscle jerks
- Atonic seizure: Sudden loss of muscle tone, high risk of falls
Diagnosis
Diagnosing an epileptic seizure involves a thorough medical evaluation and a range of diagnostic procedures:
- Medical history: Detailed account of the seizure event from the patient and any witnesses
- EEG (Electroencephalogram): Measurement of brain electrical activity, often showing epilepsy-typical patterns
- MRI (Magnetic Resonance Imaging): Brain imaging to detect structural abnormalities
- Blood tests: To rule out metabolic causes (e.g., blood glucose, electrolytes)
- Lumbar puncture: If a central nervous system infection is suspected
Treatment
Treatment depends on the underlying cause, seizure type, and frequency of episodes.
First Aid During a Seizure
- Protect the person from injury by removing dangerous objects nearby
- Place the person in the recovery position (after the seizure ends)
- Do not put any objects in the mouth
- Call emergency services (911 or local number) for a first seizure, a seizure lasting more than 5 minutes, or multiple seizures in a row
Medication
For recurring seizures (epilepsy), antiepileptic drugs (also called anticonvulsants) are used. Commonly prescribed medications include:
- Valproate
- Lamotrigine
- Levetiracetam
- Carbamazepine
The choice of medication depends on the seizure type, the age of the patient, and any coexisting medical conditions.
Surgical Treatment
In cases of drug-resistant epilepsy, neurosurgery may be considered to remove the seizure-generating area of the brain.
Additional Treatment Options
- Ketogenic diet (particularly effective in children)
- Vagus nerve stimulation (VNS)
- Deep brain stimulation (DBS)
References
- Fisher RS et al. - ILAE Official Report: A practical clinical definition of epilepsy. Epilepsia, 55(4):475-482, 2014.
- World Health Organization (WHO): Epilepsy Fact Sheet. who.int, 2024.
- Scheffer IE et al. - ILAE classification of the epilepsies: Position paper of the ILAE Commission for Classification and Terminology. Epilepsia, 58(4):512-521, 2017.
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