Acute Symptomatic Seizures: Definition, Etiology, and Management Strategies

Acute symptomatic seizures are defined as seizures occurring in close temporal association with an identifiable precipitating insult, such as an acute structural lesion of the central nervous system, metabolic derangements, toxic exposures, infections, or systemic illnesses. Because acute symptomatic seizures differ fundamentally from unprovoked seizures in terms of pathophysiology, prognosis, and long-term risk of subsequent epilepsy, accurate differentiation is of substantial clinical importance. The most recent definition proposed by the International League Against Epilepsy has further refined etiological assessment and diagnostic criteria, thereby contributing to improved classification of acute-phase seizures and the development of appropriate treatment strategies. The cornerstone of management is the prompt correction of the underlying cause, while decisions regarding the initiation and duration of antiseizure medication should be individualized according to the etiology and estimated risk of recurrence. In particular, structural etiologies such as stroke, traumatic brain injury, and central nervous system infections have been associated with a relatively higher risk of later unprovoked seizures. In addition, drug-induced seizures caused by certain antibiotics and neuroactive agents represent an important and potentially preventable category of acute symptomatic seizures. Recently, prognostic prediction tools have been proposed, facilitating risk-stratified follow-up and clinical decision-making. This review summarizes the current evidence on the definition, etiological classification, diagnostic approach, and management strategies for acute symptomatic seizures, with particular emphasis on prognostic evaluation and medication-related seizure risk.