Seizure Disorders
Basics
Description
- Seizure disorders refer to a group of conditions characterized by recurrent, unprovoked seizures due to abnormal neuronal activity in the brain. Epilepsy, the most recognized seizure disorder, is diagnosed when an individual experiences two or more unprovoked seizures separated by at least 24 hours, or one unprovoked seizure with a high risk of recurrence.
- Status epilepticus is defined as a seizure lasting >5 minutes or recurrent seizures without recovery between them; prompt management is critical due to the risk of morbidity and mortality (1).
Epidemiology
Epilepsy affects approximately 50 million people globally, making it one of the most common neurologic conditions (2).
Prevalence
Prevalence of up to 1.2% in the U.S. population as of 2023
Etiology and Pathophysiology
Seizures arise due to imbalances between excitatory and inhibitory neuronal signaling. Etiologies include structural lesions (stroke, trauma), genetic mutations, infections (e.g., neurocysticercosis), metabolic derangements, or unknown causes (3)
Genetics
Family history increases the risk 5-fold, particularly in generalized epilepsies. Mutations in genes affecting ion channels (e.g., SCN1A, KCNQ2) are implicated in various syndromes.
Risk Factors
Risk factors include febrile seizures, traumatic brain injury, CNS infections, perinatal complications, and genetic predisposition (3).
General Prevention
Primary prevention includes managing CNS infections and head trauma. Secondary prevention targets early diagnosis and adherence to therapy to reduce recurrence (2).
Commonly Associated Conditions
Common comorbidities include depression, anxiety, cognitive impairment, and migraines. Neurodevelopmental disorders often coexist in pediatric populations (3).
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