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Seizure – Causes, Symptoms and Treatment
A seizure is a sudden, uncontrolled burst of electrical activity in the brain that can cause muscle spasms, loss of consciousness, or other neurological symptoms.
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A seizure is a sudden, uncontrolled burst of electrical activity in the brain that can cause muscle spasms, loss of consciousness, or other neurological symptoms.
What Is a Seizure?
A seizure is a temporary neurological event caused by sudden, excessive, and uncontrolled electrical activity in a group of nerve cells in the brain. This abnormal electrical discharge can produce a wide range of symptoms, including involuntary muscle movements, altered consciousness, sensory disturbances, or behavioral changes. Seizures may occur as a single episode or recur over time. When seizures recur without a clearly identifiable trigger, the condition is referred to as epilepsy.
Causes
Seizures can be triggered by many different factors. A key distinction is made between provoked seizures, which have an identifiable cause, and unprovoked seizures, where no clear underlying trigger is found.
Common Causes
- Epilepsy: The most common cause of recurrent seizures.
- High fever: Particularly in young children, high fevers can cause febrile seizures.
- Stroke or brain hemorrhage: Disruption of blood supply to the brain can trigger seizures.
- Brain tumors: Both benign and malignant tumors within the brain.
- Infections: Meningitis (inflammation of the membranes surrounding the brain) or encephalitis (brain inflammation).
- Metabolic disorders: Low blood sugar (hypoglycemia), electrolyte imbalances (e.g., low sodium).
- Alcohol or drug withdrawal: Alcohol withdrawal in particular can provoke severe seizures.
- Head injuries: Traumatic brain injury can cause seizures immediately or weeks later.
- Medications: Certain drugs can trigger seizures when taken at high doses or in combination with other substances.
Symptoms
The symptoms of a seizure depend on which area of the brain is affected and how far the abnormal electrical activity spreads.
Generalized Seizures
Generalized seizures involve the entire brain. The most common type is the tonic-clonic seizure (formerly known as grand mal), in which the body first becomes rigid (tonic phase) and then shakes rhythmically (clonic phase). Other generalized seizure types include:
- Absence seizures: Brief lapses in awareness lasting only a few seconds, without convulsions.
- Myoclonic seizures: Sudden, brief muscle jerks.
- Atonic seizures: Sudden loss of muscle tone, often causing the person to fall.
Focal Seizures
Focal seizures (also called partial seizures) begin in one specific area of the brain. Depending on the region involved, symptoms may include twitching of one limb, abnormal sensations, unusual smells, or changes in awareness. Focal seizures can sometimes spread and become generalized.
General Symptoms
- Sudden loss of or change in consciousness
- Uncontrolled muscle jerking or stiffening
- Blank stare or eye rolling
- Tongue biting or foaming at the mouth
- Loss of bladder or bowel control
- Confusion and fatigue after the seizure (postictal phase)
Diagnosis
Diagnosis begins with a thorough medical history and a detailed account of the seizure from the person affected and any witnesses. Key diagnostic tools include:
- Electroencephalography (EEG): Records electrical brain activity to detect epilepsy-related patterns.
- Neuroimaging: MRI (magnetic resonance imaging) or CT (computed tomography) scans to identify structural abnormalities.
- Blood tests: To rule out metabolic causes, infections, or medication-related triggers.
- Lumbar puncture: Examination of cerebrospinal fluid if meningitis or encephalitis is suspected.
Treatment
First Aid During a Seizure
During a seizure, the person should not be restrained. Key steps include:
- Clear the surrounding area of dangerous objects.
- Gently place the person in the recovery position once the seizure subsides.
- Time the seizure – if it lasts longer than 5 minutes, call emergency services immediately (911 or local emergency number).
- Do not put anything in the person's mouth.
Medication
Recurrent seizures (epilepsy) are typically managed with antiseizure medications (also called antiepileptic drugs). Commonly used agents include:
- Valproic acid
- Lamotrigine
- Levetiracetam
- Carbamazepine
- Topiramate
For acute management of a prolonged seizure (status epilepticus), benzodiazepines such as diazepam or lorazepam are administered.
Additional Treatment Options
- Surgery: In certain focal epilepsies, surgical removal of the seizure focus can lead to seizure freedom.
- Vagus nerve stimulation: A device that delivers electrical impulses to the vagus nerve to reduce seizure frequency.
- Ketogenic diet: A high-fat, low-carbohydrate diet that can be effective in certain epilepsy syndromes, particularly in children.
References
- Fisher RS et al. – ILAE Official Report: A practical clinical definition of epilepsy. Epilepsia, 2014; 55(4): 475–482. PubMed PMID: 24730690.
- World Health Organization (WHO) – Epilepsy Fact Sheet, 2024. Available at: www.who.int/news-room/fact-sheets/detail/epilepsy
- Stafstrom CE, Carmant L – Seizures and epilepsy: an overview for neuroscientists. Cold Spring Harbor Perspectives in Medicine, 2015; 5(6): a022426. PubMed PMID: 26033084.
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