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Treatment strategies after a single seizure : rationale for immediate versus deferred treatment
Laura C Miller1, Frank W Drislane
1Harvard Medical School, Beth Israel Deaconess Medical Center, Boston, Massachusetts 02115, USA.
Insights
Treating a first epileptic seizure is debated. Most neurologists wait for a second seizure to avoid unnecessary antiepileptic drug (AED) complications, as delaying treatment doesn't worsen epilepsy outcomes.
Area of Science:
- Neurology
- Clinical Medicine
Background:
- The decision to treat a first epileptic seizure is complex, with varying risks of recurrence.
- Existing studies on seizure recurrence often involve children or patients already on antiepileptic drugs (AEDs), potentially underestimating untreated recurrence risks.
Purpose of the Study:
- To examine the rationale for treating a first epileptic seizure versus deferring treatment until a second seizure occurs.
- To review the evidence regarding the impact of delayed treatment on epilepsy course and seizure control.
Main Methods:
- Review of existing studies on seizure recurrence risk after a first unprovoked seizure.
- Analysis of factors influencing seizure recurrence, including underlying causes and patient-specific conditions.
Main Results:
- The risk of a second unprovoked seizure is less than 50%, though study methodologies vary.
- Delaying antiepileptic drug (AED) treatment until a second seizure does not appear to worsen the long-term course of epilepsy or seizure control.
- Acute symptomatic seizures typically resolve with treatment of the underlying illness, often not requiring long-term AEDs.
Conclusions:
- Waiting for a second seizure is a common recommendation to prevent unnecessary antiepileptic drug (AED) exposure and side effects.
- Certain conditions like stroke, tumors, infections, dementia, head injury, or neurosurgery warrant special consideration for earlier treatment.
- Individual patient preferences regarding risk and benefit are crucial in the decision to initiate AED treatment after a single seizure.
Abstract:
What is the rationale for the treatment of an epileptic seizure? More specifically, should a first seizure be treated as soon as it is diagnosed or should one defer treatment until a second seizure occurs? Several studies indicate that the risk of a second (unprovoked) seizure is <50%, but studies vary in methodology and most have reviewed outcome in children only. Also, many patients were maintained on antiepileptic drugs (AEDs) during these studies, meaning that the risk for seizure recurrence was perhaps underestimated compared with the risk if untreated. Most neurologists recommend waiting for a second seizure in order to avoid complications of medications that might prove to be unnecessary. Several large studies show that delaying treatment until a second seizure occurs does not worsen the course of epilepsy or likelihood of eventual seizure control. Seizures attributable to an acute illness ('acute symptomatic', provoked seizures) usually resolve with treatment of the underlying illness and thus long-term AEDs are often unwarranted. Nevertheless, seizures arising in certain circumstances are more likely to recur and there are special considerations for patients with strokes, tumours, infections and dementia, and also after head injury or neurosurgery. Patient preferences with regard to risk and benefit also enter into the decision on whether to initiate AED treatment after a single seizure.
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