Approximately 10% of the population will experience a seizure during their lifetime,
whereas only 2% to 3% will develop epilepsy.
1
,2
Determining whether a first seizure or recurrent seizures are provoked or unprovoked
is fundamentally essential for diagnosis and treatment. Patients with provoked seizures,
also known as acute symptomatic seizures (eg, electrolyte disorders, toxins, head
injury, or infectious processes) do not require long-term antiseizure medication (ASM)
therapy.
3
,
4
,
5
Certainly, a seizure provoked by a reversible insult does not fall under the definition
of epilepsy. On the other hand, patients with two unprovoked seizures are routinely
treated with ASM, given the high risk for recurrent seizures (epilepsy), up to 57%
by 1 year and 73% by 4 years.
6
Abbreviations and Acronyms:
AAN (American Academy of Neurology), ASM (antiseizure medication), EEG (electroencephalogram), ES (epileptic seizure), ILAE (International League Against Epilepsy), PNES (psychogenic nonepileptic seizures), pPNES (prolonged psychogenic nonepileptic seizures), RCT (randomized controlled trial)To read this article in full you will need to make a payment
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References
- Incidence of epilepsy and unprovoked seizures in Rochester, Minnesota: 1935-1984.Epilepsia. 1993; 34: 453-468
- The risk of seizure recurrence following a first unprovoked seizure: a quantitative review.Neurology. 1991; 41: 965-972
- ILAE official report: a practical clinical definition of epilepsy.Epilepsia. 2014; 55: 475-482
- Recommendation for a definition of acute symptomatic seizure.Epilepsia. 2010; 51: 671-675
- Autoimmune encephalitis-related seizures and epilepsy: diagnostic and therapeutic approaches.Mayo Clin Proc. 2021; 96: 2029-2039
- Risk of recurrent seizures after two unprovoked seizures.N Engl J Med. 1998; 338: 429-434
- Evidence-based guideline: management of an unprovoked first seizure in adults: report of the Guideline Development Subcommittee of the American Academy of Neurology and the American Epilepsy Society.Neurology. 2015; 84: 1705-1713
- Is the first seizure epilepsy — and when?.Epilepsia. 2015; 56: 1425-1431
- The first seizure in adult life. Value of clinical features, electroencephalography, and computerised tomographic scanning in prediction of seizure recurrence.Lancet. 1988; 1: 721-726
- Risk of recurrence after an initial unprovoked seizure.Epilepsia. 1986; 27: 43-50
- First seizure presentations in adults: beyond assessment and treatment.J Neurol Neurosurg Psychiatry. 2019; 90: 1039-1045
- Immediate versus deferred antiepileptic drug treatment for early epilepsy and single seizures: a randomised controlled trial.Lancet. 2005; 365: 2007-2013
- Seizure recurrence after a 1st unprovoked seizure: an extended follow-up.Neurology. 1990; 40: 1163-1170
- Risk of recurrence after a first unprovoked seizure.Epilepsia. 2008; 49: 13-18
- Prediction of risk of seizure recurrence after a single seizure and early epilepsy: further results from the MESS trial.Lancet Neurol. 2006; 5: 317-322
- Short- and long-term outcomes of immediate and delayed treatment in epilepsy diagnosed after one or multiple seizures.Epilepsy Behav. 2021; 117107880
- Randomized clinical trial on the efficacy of antiepileptic drugs in reducing the risk of relapse after a first unprovoked tonic-clonic seizure. First Seizure Trial Group (FIR.S.T. Group).Neurology. 1993; 43: 478-483
- First seizure in adults: to treat or not to treat.Clin Neurol Neurosurg. 1992; 94: S61-S63
- No prevention or cure of epilepsy as yet.Neuropharmacology. 2020; 168107762
- 30 years of second-generation antiseizure medications: impact and future perspectives.Lancet Neurol. 2020; 19: 544-556
- Prediction tools for psychiatric adverse effects after levetiracetam prescription.JAMA Neurol. 2019; 76: 440-446
- The FDA alert on suicidality and antiepileptic drugs: fire or false alarm?.Epilepsia. 2009; 50: 978-986
- Tolerability of antiseizure medications in individuals with newly diagnosed epilepsy.JAMA Neurol. 2020; 77: 574-581
- Treatment of the first tonic-clonic seizure does not affect long-term remission of epilepsy.Neurology. 2006; 67: 2227-2229
- Quality of life outcomes of immediate or delayed treatment of early epilepsy and single seizures.Neurology. 2007; 68: 1188-1196
- Treatment of first tonic-clonic seizure does not affect mortality: long-term follow-up of a randomised clinical trial.J Neurol Neurosurg Psychiatry. 2011; 82: 924-927
- Hospital-onset seizures: an inpatient study.JAMA Neurol. 2013; 70: 360-364
- Incidence of first seizures, epilepsy, and seizure mimics in a geographically defined area.Neurology. 2020; 95: e576-e590
- Medical health care utilization cost of patients presenting with psychogenic nonepileptic seizures.Epilepsia. 2019; 60: 349-357
- Psychogenic nonepileptic seizures.Mayo Clin Proc. 1996; 71: 493-500
- Evaluation of the Patient With Paroxysmal Spells Mimicking Epileptic Seizures.The Neurologist. 2022;
- Misdiagnosis of prolonged psychogenic nonepileptic seizures as status epilepticus: epidemiology and associated risks.J Neurol Neurosurg Psychiatry. 2021; 92: 1341-1345
- Intramuscular versus intravenous therapy for prehospital status epilepticus.N Engl J Med. 2012; 366: 591-600
- Randomized trial of three anticonvulsant medications for status epilepticus.N Engl J Med. 2019; 381: 2103-2113
- Mind the gap: multiple events and lengthy delays before presentation with a "first seizure.Epilepsia. 2015; 56: 1534-1541
- Operational classification of seizure types by the International League Against Epilepsy: position paper of the ILAE Commission for Classification and Terminology.Epilepsia. 2017; 58: 522-530
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Published online: December 02, 2022
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