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Overview and Recommendations
Background
- •Define epilepsy as a clinical syndrome of recurrent unprovoked seizures, distinguishing between ictogenesis (the acute transition to a seizure) and epileptogenesis (the chronic process of brain transformation into a seizure-prone state). The condition affects approximately 1% of the population and carries significant risks of morbidity, cognitive decline, and sudden unexpected death in epilepsy (SUDEP).
- •Recognize the core pathophysiology involving the tripartite synapse, where disruptions in ion channels (e.g., SCN1A, KCNQ2) and glial regulation of glutamate (via TREK-1 channels) lead to neuronal hyperexcitability. In many cases, an initial insult such as traumatic brain injury or status epilepticus triggers neuroinflammation and maladaptive plasticity, cementing the epileptic network.
- •Classify seizures by onset as focal (originating in one hemisphere), generalized (involving bilateral networks from the start), or unknown. Focal seizures are further categorized by the preservation or impairment of awareness, which is a primary classifier in the 2025 ILAE update.
- •Identify key genetic variants that dictate clinical phenotypes, such as SCN1A loss-of-function in affecting inhibitory interneurons, or KCNQ2 variants leading to a spectrum from self-limited neonatal epilepsy to severe developmental and epileptic encephalopathy (DEE).
- •Understand the role of metabolic and inflammatory triggers, including succinic semialdehyde dehydrogenase deficiency (SSADHD) and autoimmune encephalitis, which may present with drug-resistant seizures and require targeted metabolic or immunosuppressive therapy.
Evaluation
- •Suspect epilepsy in any patient presenting with paroxysmal alterations in consciousness, motor activity, or sensory perception. Prioritize a meticulous reconstruction of the event from witnesses, as patient self-reporting is frequently inaccurate, especially in focal onset impaired awareness seizures (FIAS).
- •Ask about the pre-ictal phase to identify triggers such as sleep deprivation, fever, or specific reflex stimuli like reading. In cases of Febrile Infection-Related Epilepsy Syndrome (FIRES), look for a febrile illness occurring 24 hours to 7 days prior to the onset of status epilepticus.
- •Examine for systemic markers of genetic syndromes, such as macrocephaly in ODLURO syndrome (KMT2E variants) or distinct facial features and microcephaly in Mowat-Wilson syndrome. Assess for neurodevelopmental delays or regression, which suggest a DEE rather than a benign epilepsy syndrome.
- •Obtain a routine or sleep-deprived EEG within 24 hours of the first seizure event to maximize the diagnostic yield for interictal epileptiform discharges (IEDs). If the initial EEG is normal, utilize functional tests or sleep induction (e.g., using melatonin 5 mg in children) to increase sensitivity.
- •Order a high-resolution 3T MRI using a dedicated epilepsy protocol to rule out structural lesions such as focal cortical dysplasia (FCD), hippocampal sclerosis, or multinodular and vacuolating neuronal tumors (MVNT).
- •Rule out non-epileptic mimics by assessing serum biomarkers within 60 minutes of the event; a serum lactate > 2.5 mmol/L or elevated prolactin and ammonia levels strongly suggest an epileptic seizure over syncope or functional/psychogenic non-epileptic seizures (PNES).
- •Monitor for autonomic red flags, such as ictal heart rate increases > 50 bpm or significant peripheral oxygen desaturation (SpO2), which may serve as biomarkers for increased SUDEP risk.
- •Screen for pediatric-specific red flags, including bruising in non-exploratory areas (ears, neck, torso) in infants < 1 year old, which may indicate abusive head trauma as the underlying cause of new-onset seizures.
- •Consider genetic testing (e.g., epilepsy panels or whole-exome sequencing) in patients with early-onset seizures, developmental delay, or a family history of epilepsy, as over 1,000 genes are now associated with epileptic phenotypes.
- •Utilize the STAMP scale (Scale for Objective Diagnostic Components of Paroxysmal Events) to objectively grade the likelihood of an epileptic seizure versus syncope based on clinical semiology.
Management
- •Administer first-line monotherapy for focal epilepsy using Lamotrigine (titrated slowly to 100-200 mg BID) or Levetiracetam (500-1500 mg BID). Lamotrigine is preferred in patients of childbearing potential due to its lower teratogenic risk compared to other agents.
- •Avoid Valproate in women of childbearing potential whenever possible due to high risks of major congenital malformations and adverse neurodevelopmental outcomes; if required, use the lowest effective dose with concurrent folic acid supplementation.
- •Manage Infantile Epileptic Spasms Syndrome (IESS) urgently by initiating ACTH monotherapy, followed by a clinical and EEG assessment on Day 7; if spasms persist, add Vigabatrin (50 mg/kg/day, titrated up to 150 mg/kg/day) to the regimen.
- •Treat status epilepticus (seizure > 5 minutes) as a neurological emergency: start with IV Lorazepam 4 mg (repeated once if needed), followed immediately by a second-line ASM such as IV Levetiracetam 60 mg/kg (max 4500 mg) or Fosphenytoin 20 mg PE/kg.
- •Escalate to Cenobamate (starting at 12.5 mg/day and titrating slowly to 200-400 mg/day) for adults with drug-resistant focal seizures, as it has shown high potency in reducing seizure frequency across all focal subtypes.
- •Refer patients for a comprehensive presurgical evaluation if they fail two appropriately chosen and tolerated ASM trials (drug-resistant epilepsy). Surgical options include anterior temporal lobectomy (ATL) for mesial temporal lobe epilepsy or Laser Interstitial Thermal Therapy (LITT) for deep-seated lesions.
- •Consider palliative procedures such as Vagus Nerve Stimulation (VNS) or Responsive Neurostimulation (RNS) for patients who are not candidates for resective surgery or who have multifocal seizure onsets.
- •Monitor for medication-induced autonomic changes, such as hypohidrosis (reduced sweating) and hyperthermia in patients taking Zonisamide or Topiramate, particularly in warm environments.
- •Perform therapeutic drug monitoring (TDM) during pregnancy, as physiological changes (increased glomerular filtration) can significantly lower ASM plasma levels, necessitating dose adjustments to maintain seizure control.
- •Implement an Acute Seizure Action Plan for all patients, including rescue medications (e.g., intranasal Midazolam 5-10 mg) for clusters or prolonged events to prevent progression to status epilepticus.
- •Avoid routine ASM prophylaxis in seizure-naive patients with newly diagnosed brain tumors, as evidence from the SPRING trial suggests it does not meaningfully reduce the risk of a first seizure.
- •Evaluate for ASM withdrawal only after a minimum of 2 years of seizure freedom, counseling the patient that the risk of recurrence is approximately 15% compared to 7% if treatment is continued.
- •Refer for specialized metabolic management in cases of vitamin B6-dependent epilepsy (PLPBP-related), where high-dose pyridoxine is the definitive treatment.
- •Monitor cognitive and neuropsychiatric comorbidities, particularly ADHD (present in ~30% of pediatric cases) and depression, which can significantly impact quality of life and ASM adherence.
Board Review — High Yield
- •SCN1A mutation — The hallmark of Dravet Syndrome; avoid sodium channel blockers as they worsen seizures.
- •3 Hz spike-and-wave — Classic EEG finding for Childhood Absence Epilepsy.
- •Hypsarrhythmia — The chaotic EEG pattern associated with West Syndrome (Infantile Spasms).
- •Drug-Resistant Epilepsy — Defined as failure of 2 tolerated and appropriately chosen ASM schedules.
- •SUDEP — Sudden Unexpected Death in Epilepsy; risk is highest with uncontrolled generalized tonic-clonic seizures and nocturnal events.
- •Gelastic seizures — Associated with hypothalamic hamartomas; present as inappropriate bursts of laughter.
- •Todd's Paralysis — Focal neurological deficit (usually hemiparesis) following a focal seizure, typically resolving within 24 hours.
- •BECTS (SeLECTS) — Most common childhood epilepsy; characterized by centrotemporal spikes and nocturnal orofacial seizures.
Deep Dive — Evidence Details
Pathophysiology
- ▸SCN1A loss-of-function primarily impairs GABAergic interneuron excitability, leading to network hyperexcitability in Dravet syndrome.
- ▸SCN8A-related disorders often present within the first year of life (80.77% of cases) and involve both gain-of-function and loss-of-function mechanisms.
- ▸KCNQ2 and STXBP1 are major genetic drivers of early infantile developmental and epileptic encephalopathy with burst-suppression (EIDEE-BS).
- ▸SLC6A1 mutations cause epilepsy by impairing the GAT-1 GABA transporter, leading to deficient inhibitory tone.
- ▸Neuroinflammatory pathways involving IL-1β, MyD88, and JAK/STAT3 contribute to the transformation of healthy brain tissue into an epileptogenic state.
- ▸Novel genetic therapies like base editing and prime editing are being developed to correct SCN1A mutations at the genomic level.
The pathophysiology of epilepsy is increasingly understood as a complex interplay between genetic mutations, ion channel dysfunction, and neuroinflammatory cascades that disrupt the balance of neuronal excitation and inhibition. Recent evidence emphasizes the role of specific genetic variants in developmental and epileptic encephalopathies (DEEs), where the underlying molecular defect often dictates the clinical phenotype and treatment response [241]C[256]D.
Ion Channelopathies and Synaptic Dysfunction
Voltage-gated sodium channels (VGSCs) are central to the initiation and propagation of action potentials. Mutations in SCN1A, which encodes the NaV1.1 subunit, are the primary cause of Dravet syndrome (DS) and Genetic Epilepsy with Febrile Seizures plus (GEFS+) [20]D[250]D. In DS, loss-of-function (LoF) variants in SCN1A specifically impair the excitability of GABAergic interneurons, leading to reduced inhibitory signaling and subsequent network hyperexcitability [250]D[254]D. This interneuron-specific failure is a hallmark of DS pathophysiology, contributing to drug-resistant seizures and cognitive deficits [1]D[249]D. Conversely, SCN8A (NaV1.6) variants often present with early-onset epilepsy, with 80.77% of patients experiencing onset within the first year of life [246]. While many SCN8A variants are gain-of-function, recent studies have identified a significant proportion of LoF variants (65.38%) associated with intellectual disability and movement disorders [246][245]C. SCN2A (NaV1.2) LoF variants are typically associated with later-onset epilepsy (onset ≥3 months), autism spectrum disorder, and intellectual disability, though the specific mechanism of channel dysfunction does not always predict the clinical phenotype [256]D.
Potassium channel dysfunction also plays a critical role. KCNQ2 and KCNQ3 encode Kv7 channels, which provide the 'M-current'—a fundamental molecular brake against pathological firing [248]D. Variants in KCNQ2 are major causes of early infantile developmental and epileptic encephalopathy with burst-suppression (EIDEE-BS) [241]C. Similarly, KCNA2 (Kv1.2) variants are associated with epilepsy onset at a median age of 6 months, often involving spike-and-wave activation in sleep (SWAS) [251]D. Novel associations include KCNJ4 (Kir2.3), where variants disrupt inward-rectifier potassium currents, and KCNC1 (Kv3.1), where the p.Ala421Val variant impairs the high-frequency firing of parvalbumin-positive fast-spiking GABAergic interneurons [255]D[12]D. Calcium channel involvement is exemplified by CACNA1A (Cav2.1) mutations, which can cause a spectrum of focal seizures, ataxia, and migraine, sometimes showing sex-stratified penetrance [242].
Non-Ion Channel Genetic Mechanisms
Beyond ion channels, mutations in genes regulating synaptic vesicle release and intracellular metabolism contribute to epileptogenesis. STXBP1 variants are frequently identified in MRI-negative EIDEE-BS cohorts [241]C. SLC6A1 encodes the GAT-1 transporter, the primary synaptic GABA transporter; heterozygous LoF variants lead to GABAergic deficiency, resulting in early-onset epilepsy and autistic features [247]D. In progressive myoclonic epilepsy (PME), biallelic variants in KCTD7 cause neuroregression and myoclonus, often with a median onset of 11 months [8]D. Furthermore, variants in the PRUNE1 gene, specifically the DHH motif, are thought to disrupt ion coordination, providing a new insight into the pathogenesis of refractory seizures and developmental delay [243].
Neuroinflammation and Glial Remodeling
Emerging research highlights the role of the innate immune system and glial cells in maintaining or exacerbating the epileptic state. Activation of the NLRP3 inflammasome and the P2×7 receptor pathway leads to the maturation of interleukin-1β (IL-1β), which triggers the MyD88 and PI3K/AKT/mTOR cascades [252]D. These pathways enhance NMDA receptor activity and glutamate release while suppressing GABAergic inhibition, creating a self-perpetuating cycle of hyperexcitability [252]D. In models of Dravet syndrome, long-lasting remodeling of hippocampal and cortical astrocytes has been observed, suggesting that glial changes persist from the initial disease aggravation through long-term stabilization [254]D.
Therapeutic Implications of Pathophysiology
Understanding the molecular root cause is driving the development of precision therapies. While traditional antiseizure medications (ASMs) like valproate often fail in severe DEEs, targeted approaches are emerging [242][244]C. Fenfluramine has shown efficacy in SCN1A-related GEFS+, potentially by modulating serotonergic pathways to compensate for reduced inhibition [244]C. Second-generation Kv7 (KCNQ) agonists are being developed as high-precision 'molecular brakes' for focal epilepsy [248]D. Most significantly, genetic therapies such as adenine base editing (ABE) and prime editing are being investigated to directly correct SCN1A mutations, offering the potential to ameliorate the root cause of Dravet syndrome and GEFS+ rather than merely managing symptoms [249]D[250]D.
| Gene | Protein/Channel | Primary Mechanism | Clinical Phenotype |
|---|---|---|---|
| SCN1A | NaV1.1 (Sodium) | Loss-of-function (Interneurons) | Dravet Syndrome, GEFS+ |
| SCN8A | NaV1.6 (Sodium) | LoF (65%) or GoF | Early-onset DEE, Movement disorders |
| KCNQ2 | Kv7.2 (Potassium) | Impaired M-current | EIDEE-BS, Benign neonatal seizures |
| SLC6A1 | GAT-1 (GABA Transporter) | Reduced GABA reuptake | DEE with Absence seizures, ASD |
| KCNC1 | Kv3.1 (Potassium) | Impaired fast-spiking interneurons | Myoclonic epilepsy, DEE |
| PRUNE1 | PRUNE1 Exonuclease | DHH motif/Ion coordination defect | Refractory epilepsy, Neuroregression |
History and Physical Examination
- ▸Progressively worsening severe headaches in epilepsy patients in endemic areas are highly suggestive of neurocysticercosis [191].
- ▸Physical frailty, defined by weight loss, exhaustion, and slow gait, is a longitudinal risk factor for incident epilepsy [258].
- ▸Ictal heart rate increases of > 50 bpm are significant markers for automated seizure detection [34].
- ▸Antiseizure medications like valproate and carbamazepine significantly increase the risk of obesity and hyperlipidemia [31, 262].
- ▸Pediatric epilepsy is associated with interictal ECG abnormalities, including T-wave alternans and P-wave dispersion [263, 264].
- ▸Successful epilepsy surgery can normalize cardiac repolarization biomarkers like TWA [263].
- ▸7T MRI can identify volume loss in the thalamus and brainstem in patients previously classified as non-lesional [259].
- ▸Thalamic volume asymmetry is a potential predictor of response to vagus nerve stimulation [261].
Initial Clinical History and Risk Assessment
The clinical evaluation of epilepsy begins with a comprehensive history focused on seizure semiology, comorbid symptoms, and underlying risk factors. In low- and middle-income countries (LMICs), clinicians must specifically screen for neurocysticercosis (NCC), a leading cause of epilepsy [191]D. The presence of progressively worsening severe headaches (PWSH) in conjunction with seizures is a significant clinical indicator for NCC, necessitating cerebral computed tomography (cCT) to identify characteristic lesions [191]D. In pediatric populations presenting with new-onset seizures or injuries, a high index of suspicion for physical abuse is required, particularly in children younger than 1 year [32]. Identifying abusive injuries early is critical, as many children who suffer fatal maltreatment have unidentified prior injuries [32].
In adult populations, physical frailty has emerged as a significant longitudinal predictor of incident epilepsy [258]. The history should assess for the five components of the Fried frailty phenotype: unintentional weight loss, exhaustion, low physical activity, slow gait speed, and low grip strength [258]. Individuals categorized as prefrail or frail exhibit a higher risk of developing epilepsy compared to nonfrail counterparts [258]. Furthermore, long-term monitoring of circadian rhythms via wearable sensors has revealed that intraindividual variability in these rhythms is higher in people with epilepsy (PWE), suggesting that disruption of the 24-hour light-dark cycle synchronization may modulate seizure susceptibility [51]D.
Physical and Metabolic Examination
The physical examination must include a detailed assessment of metabolic and endocrine status, as both the disease and its treatment significantly impact these systems. Obesity and overweight status are common in PWE, influenced by a complex interaction between genetic susceptibility (polygenic risk scores for BMI), lifestyle factors, and antiseizure medications (ASMs) [262]. Specifically, medications such as valproate (VPA) and carbamazepine (CBZ) are associated with weight gain and hyperlipidemia, whereas levetiracetam (LEV) and lamotrigine (LTG) generally have more neutral profiles [31][262]. Clinical monitoring for lipid derangements is recommended after ≥ 3 months of ASM monotherapy [31].
Endocrine evaluation, particularly thyroid function, is essential in pediatric patients. Children receiving levetiracetam monotherapy should be monitored for changes in thyroid volume and function, including fT3, fT4, and TSH levels [44]D. While routine tests may appear normal, subtle changes in central thyroid hormone sensitivity (e.g., TFQI, TSHI) and peripheral metabolism (FT3/FT4 ratio) are often present in pediatric epilepsy, potentially linked to long-term ASM use and metabolic health [266].
Autonomic and Cardiac Evaluation
Autonomic dysfunction is a critical component of the physical assessment due to its link to Sudden Unexpected Death in Epilepsy (SUDEP). Ictal autonomic changes, such as a heart rate (HR) increase exceeding 50 bpm, are highly sensitive markers for seizure detection and can be monitored using wearable ECG devices [34]. These devices also assist in determining the impairment of consciousness during events [34].
Interictal cardiac abnormalities are frequently detectable on a standard 12-lead ECG. Pediatric patients often exhibit subclinical alterations in ventricular repolarization and conduction, including increased corrected QT dispersion (QTcd), Tpeak-Tend (Tp-e) intervals, and P-wave dispersion (PWD) [264]. Furthermore, interictal T-wave alternans (TWA), a biomarker of cardiac repolarization instability, is elevated in children with drug-resistant epilepsy (DRE) [263]. Notably, successful surgical intervention (Engel class IA) has been shown to normalize TWA levels, suggesting that seizure control can mitigate cardiac risk [263]. Phenotype-specific disruptions in hypercapnic cardioventilatory responses also exist; for instance, chronic generalized tonic-clonic seizures are associated with more profound impairments in autonomic regulation during CO2 challenges compared to absence seizures [265]. The cingulo-insular region plays a pivotal role in this balance, with specific subdivisions modulating the sympathetic-parasympathetic equilibrium [42]D.
Neurological and Neuropsychological Findings
The neurological examination should be supplemented by assessments of cognitive and emotional processing. Patients with temporal lobe epilepsy (TLE), particularly those with comorbid depression, demonstrate significant deficits in emotion recognition (ER) [46]D. Eye-tracking studies show that these patients exhibit more fixations in static facial regions when attempting to identify emotions like anger, disgust, or sadness [46]D.
Advanced neuroimaging serves as a "physical exam" of brain structure. In non-lesional epilepsy, 7T MRI can detect subtle, local volume reductions in the hippocampal subfields, thalamic nuclei, and brainstem that are invisible to the human eye [259]C. In mesial temporal lobe epilepsy (mTLE), hippocampal atrophy is a defining feature, often involving the contralateral side to varying degrees [260]. Thalamic volume asymmetry is also clinically relevant; preoperative assessment of this asymmetry can predict outcomes for vagus nerve stimulation (VNS), with responders typically showing distinct structural patterns compared to non-responders (defined as ≥ 50% seizure reduction) [261]C. Overall, global gray matter volume (GMV) reductions are associated with poorer clinical outcomes and lower rates of seizure freedom [267].
| Parameter | Clinical Significance | Relevant ASMs |
|---|---|---|
| Weight/BMI | Increased risk of obesity; genetic interaction | Valproate, Carbamazepine [31][262] |
| Lipid Profile | Hyperlipidemia risk after ≥ 3 months | Valproate, Carbamazepine [31] |
| Thyroid Volume | Potential enlargement or dysfunction | Levetiracetam [44]D |
| Thyroid Sensitivity | Central/peripheral hormone resistance | Various (long-term use) [266] |
Clinical Features and Seizure Variants
- ▸Brain-responsive neurostimulation (RNS) achieves a 67% median reduction in focal seizures at 3 years.
- ▸Super-refractory status epilepticus (SRSE) is defined by persistence >24 hours despite anesthetics.
- ▸Vagus Nerve Stimulation (VNS) is an emerging adjunctive treatment for SRSE and NORSE.
- ▸Genetic variants in UNC13A, YWHAG, and CACNA1A define specific pediatric epilepsy phenotypes.
- ▸Rural patients in the US face higher mortality and higher rates of status epilepticus presentation.
- ▸Epileptiform EEG patterns post-cardiac arrest predict poor neurological recovery.
Focal Seizure Variants and Diagnostic Challenges
Focal seizures remain a primary clinical presentation in drug-resistant epilepsy, often requiring advanced neuromodulation when medication fails. In a large post-approval study of brain-responsive neurostimulation (RNS System), patients with focal epilepsy demonstrated a median percent change in seizure frequency of 67% at 3 years [268]. Clinical recognition of focal seizures can be challenging; for instance, in patients with pleomorphic xanthoastrocytomas (PXAs), 31.6% had unrecognized focal seizures prior to their index presentation [276]. Furthermore, non-invasive detection of focal seizures is evolving through multimodal wearable devices (e.g., Sensor Dot) using EEG and ECG, which aim to provide accurate out-of-hospital monitoring for diverse focal seizure types [281].
Status Epilepticus and Super-Refractory Variants
Super-refractory status epilepticus (SRSE) is defined as status epilepticus persisting for more than 24 hours despite anesthetic management [271]C. This condition carries high morbidity and requires aggressive intervention. Surgical options, including resective surgery, multiple subpial transections, and Vagus Nerve Stimulation (VNS), are increasingly utilized [271]C. VNS has specifically shown promise as an adjunctive therapy for SRSE, including New-Onset Refractory Status Epilepticus (NORSE), with some patients achieving seizure cessation during hospitalization [70].
In the management of SRSE, intravenous ketamine is employed, with treatment response potentially predicted by specific inflammatory biomarkers and EEG patterns [272]C. Notably, peri-ictal abnormalities on diffusion-weighted MRI (DWI-PMA) are well-documented in status epilepticus; however, patients with idiopathic generalized epilepsy (IGE) who develop SE show lower rates of these abnormalities compared to those with other etiologies, correlating with generally more favorable outcomes [275].
Pediatric and Genetic Epilepsy Phenotypes
Genetic etiologies are major contributors to pediatric epilepsy, particularly those complicated by status epilepticus [86]D. Several specific genetic syndromes have recently been characterized:
- YWHAG-NDD: Associated with early-onset epilepsy and epileptic encephalopathy; natural history studies are ongoing to define its progression [273].
- PTEN Hamartoma Tumor Syndrome (PHTS): While primarily known for tumor risks, PHTS is associated with a significant prevalence of epilepsy, necessitating clinical management guidelines [280].
- UNC13A-related Disorders: These present with diverse epilepsy phenotypes in children, with missense variants often localized in the Munc13-1 hinge regions [283]C.
- CACNA1A Variants: Mutations such as c.5610del can result in a spectrum of epilepsy, ataxia, and migraine, with evidence suggesting sex-stratified penetrance [242].
- Infantile Epileptic Spasms Syndrome (IESS): This age-specific encephalopathy is linked to neuroinflammation, specifically the HMGB1-TLR4 signaling pathway, which may serve as a clinical biomarker for treatment response [278].
Prognostic Indicators and Clinical Outcomes
Predicting outcomes in epilepsy involves both clinical and environmental factors. In survivors of cardiac arrest, the presence of epileptiform patterns on EEG and clinical myoclonic seizures are strong predictors of unfavorable neurological outcomes [270]. For patients undergoing VNS, prognostic factors for a positive response include age at onset, age at implantation, and genetic etiology [269].
Environmental and systemic factors also play a role; in the United States, rural residence is associated with higher in-hospital mortality and a higher likelihood of presenting in status epilepticus compared to urban counterparts, likely due to limited access to specialized epilepsy centers [277]. Additionally, seizure-type-specific disruptions in autonomic regulation, such as impaired hypercapnic cardioventilatory responses, are observed in chronic generalized tonic-clonic models, potentially increasing the risk of Sudden Unexpected Death in Epilepsy (SUDEP) [265].
| Gene/Condition | Clinical Features | Evidence Level |
|---|---|---|
| UNC13A | Pediatric neurodevelopmental disorder; missense variants in Munc13-1 | 4 [283]C |
| YWHAG | Early-onset epilepsy; 14-3-3 protein family involvement | 2b [273] |
| CACNA1A | Epilepsy, ataxia, and migraine; sex-stratified penetrance | 3b [242] |
| IESS | Infantile spasms; HMGB1-TLR4 neuroinflammatory markers | 3b [278] |
| PXA | Tumor-related epilepsy; 31.6% unrecognized focal seizures | 3b [276] |
Diagnosis and Workup
- ▸EEG should be performed within 24 hours of a first seizure to reduce the risk of status epilepticus and ICU admission [88].
- ▸Genetic testing is indicated in early-onset or syndromic epilepsies, as over 1,000 genes are now linked to the condition [90].
- ▸Advanced neuroimaging, including fMRI and AI-assisted EZ localization, is critical for presurgical planning in drug-resistant cases [92, 106].
The diagnosis of epilepsy is a multi-dimensional process that integrates clinical semiology, electrophysiological data, and advanced neuroimaging to identify the underlying etiology and localize the epileptogenic zone (EZ) [89]. Early and accurate diagnosis is critical, as delays in performing an electroencephalogram (EEG) after a seizure event significantly increase the risk of progression to status epilepticus (SE) and subsequent intensive care unit (ICU) admission [88]D.
Diagnostic Criteria
Epilepsy is formally diagnosed based on the occurrence of at least two unprovoked seizures occurring >24 hours apart, or one unprovoked seizure with a high probability of recurrence (at least 60%) over the next 10 years. In pediatric populations, the workup of first seizure-like events requires careful differentiation from non-epileptic mimics, with future epilepsy risk being higher in children with abnormal baseline EEGs or specific neuroimaging findings [91]. For specialized forms such as diffuse glioma-related epilepsy (dGRE), diagnosis requires spatial correlation between the tumor and the EZ, often necessitating a combination of EEG and molecular biomarkers [89].
Laboratory and Genetic Testing
Laboratory workup aims to identify metabolic, genetic, or inflammatory triggers.
- Genetic Testing: Genetic epilepsies involve pathogenic variants in over 1,000 genes [90]. Early genotype-phenotype interpretation is essential for precision . For example, PLPBP-related vitamin B6-dependent epilepsy presents with severe neurodevelopmental delay and requires specific genetic confirmation [93].
- Metabolic Markers: In cases of infantile epileptic spasms syndrome (IESS), a 7-day assessment of response to adrenocorticotropic hormone (ACTH) is used to guide sequential treatment with vigabatrin (VGB) [98].
- Inflammatory Biomarkers: In insular gliomas, peripheral inflammatory cell counts may serve as biomarkers for brain reorganization and associated epilepsy [105]D.
Electrodiagnostic Studies
EEG remains the gold standard for confirming network hyperexcitability. Guidelines emphasize the use of "functional tests" (formerly stress tests) to increase diagnostic yield [94][95].
- Routine and Sleep-Deprived EEG: Standard scalp EEG (scEEG) may miss interictal epileptiform discharges (IEDs), particularly those originating in the mesial temporal lobe (MTL). Advanced Support Vector Machine classifiers can now detect "hidden" MTL IEDs on scEEG with high accuracy using 58 specific features [111]D.
- Sleep Monitoring: Sleep-predominant network hyperexcitability is a key finding in early-stage Alzheimer's disease, where IEDs may accelerate cognitive decline [96].
- Long-term Monitoring: Video-EEG monitoring is essential for characterizing seizure semiology. In idiopathic generalized epilepsy (IGE), absence status epilepticus (ASE) is a frequent but often misdiagnosed presentation [62]C.
- Automated Detection: Deep learning models, such as the Multi-scale Kernel and Electrode Attention Network (MKEANet), allow for automated seizure detection from full-channel EEG signals without information loss [102]D[113]D.
Neuroimaging
High-resolution MRI using an epilepsy protocol is the first-line imaging modality to detect structural lesions such as focal cortical dysplasia or tumors [89][106]D.
- Advanced MRI Techniques: Morphometric analysis in conditions like self-limiting epilepsy with centrotemporal spikes (SeLECTS) reveals cortical thinning and subcortical volume changes linked to cognitive function [103]D. Functional MRI (fMRI) is used to assess the default mode network (DMN) and somatomotor network (SMN), which are frequently altered in focal epilepsy [104]D.
- SUDEP Risk Assessment: Breath-holding fMRI can identify brainstem respiratory center dysfunction in patients at risk for sudden unexpected death in epilepsy (SUDEP) [110]D.
- Artificial Intelligence (AI): AI architectures are increasingly used for EZ localization, segmentation of resection cavities, and predicting surgical outcomes [92][106]D.
Diagnostic Algorithm
- Step 1: Clinical Assessment: Detailed history of the event, semiology, and family history [90][91].
- Step 2: Initial EEG: Perform within 24 hours of the event to minimize SE risk [88]D. Use functional tests if the initial routine EEG is normal [95].
- Step 3: Structural Imaging: High-resolution MRI (3T preferred) with epilepsy-specific sequences [89].
- Step 4: Specialized Workup: If drug-resistant, proceed to long-term video-EEG, genetic panels [90], or metabolic screening [93].
- Step 5: Presurgical Evaluation: For surgical candidates, utilize stereo-electroencephalography (sEEG), which is less invasive than subdural electrodes [101]D, and integrate intraoperative ultrasound (ioUS) with depth-electrode electrocorticography (iECoG) for real-time EZ delineation [108]D.
| Test | Primary Finding | Timing | Clinical Utility |
|---|---|---|---|
| Scalp EEG | Interictal epileptiform discharges (IEDs) | Within 24h of seizure | Confirms diagnosis; predicts recurrence [88]D[91] |
| High-Res MRI | Structural lesions (e.g., FCD, glioma) | At initial workup | Identifies etiology; guides surgery [89][106]D |
| Genetic Panel | Pathogenic variants (e.g., KCNQ2, PLPBP) | Early in pediatric cases | Precision diagnosis; guides therapy [90][93] |
| sEEG | Intracranial seizure onset zone | Presurgical phase | Less invasive than subdural grids [101]D |
| fMRI | Network connectivity/Respiratory center | Presurgical/SUDEP screening | Evaluates functional risk [104]D[110]D |
Differential Diagnosis of Epilepsy
- ▸Serum lactate and ammonia measured within 60 minutes are highly effective for distinguishing epileptic seizures from syncope and functional seizures.
- ▸Home video recordings provide high interobserver reliability and diagnostic accuracy for differentiating sleep-related hypermotor epilepsy from non-epileptic disorders of arousal.
- ▸Advanced imaging like MR fingerprinting and metabolic network analysis can identify subtle epileptogenic lesions that conventional MRI may miss.
The differential diagnosis of epilepsy is broad, as many transient neurological events can mimic epileptic seizures (ES). Accurate differentiation is critical because misdiagnosis leads to inappropriate treatment with antiseizure medications (ASMs) and delays the of the underlying condition [119]D[126]D. The diagnostic process relies on a combination of clinical semiology, serum biomarkers, and electrophysiological data to distinguish ES from functional seizures, syncope, and sleep disorders [121][139]D.
Diagnostic Criteria
Formal diagnosis of epilepsy requires evidence of an enduring predisposition to generate seizures [119]D. The following criteria are utilized to differentiate epilepsy from its mimics:
- Required Features: At least one unprovoked (or reflex) seizure and a probability of further seizures similar to the general recurrence risk (at least 60%) after two unprovoked seizures, occurring over the next 10 years [119]D.
- Supportive Features: Presence of interictal epileptiform discharges (IEDs) on EEG, though these can occasionally be incidental in healthy infants [133]D; focal lesions on MRI such as multinodular and vacuolating neuronal tumors (MVNT) [117]C or focal cortical dysplasia (FCD) [129]D; and specific serum biomarker elevations (e.g., lactate, prolactin) within 60 minutes of the event [121][142]D.
- Exclusion Criteria: Events clearly triggered by transient systemic factors (e.g., hypoglycemia, acute alcohol withdrawal, or hyponatremia) are classified as acute symptomatic seizures rather than epilepsy [126]D. Events with purely psychological triggers and no EEG correlate are classified as functional/psychogenic non-epileptic seizures (PNES) [122][135]D.
Laboratory Tests
Laboratory evaluation is most effective when performed immediately following a paroxysmal event. Serum biomarkers help distinguish ES from functional/cognitive seizures (FCS) and syncope [121].
- Lactate and Ammonia: Serum lactate and ammonia levels are significantly higher in patients with ES compared to those with FCS or syncope when measured within 1 hour of the event [121]. Lactate is particularly sensitive for generalized tonic-clonic seizures due to intense muscle contraction and anaerobic metabolism.
- Prolactin and Cortisol: A significant rise in serum prolactin and cortisol is observed within 20–60 minutes after an ES, whereas these levels typically remain stable or show minimal change after PNES [142]D.
- Neurofilament Light (NfL) and GFAP: Plasma NfL and glial fibrillary acidic protein (GFAP) are elevated in patients with chronic epilepsy compared to those with PNES, reflecting cumulative neuroaxonal and astrocytic injury [125]D[140]D.
- Metabolomic Profiling: NMR-based metabolomics can differentiate (AE) from drug-resistant epilepsy (DRE) by identifying distinct plasma signatures [141]D.
Imaging
Neuroimaging is essential to identify structural mimics or triggers of seizures.
- Magnetic Resonance Imaging (MRI): The modality of choice. It can identify rare tumors like MVNT, which present as T2/FLAIR hyperintense subcortical nodules that may mimic other dysplastic lesions [117]C.
- MR Fingerprinting (MRF): This advanced technique uses T1 and T2 relaxometry maps to differentiate epileptogenic cortical malformations from non-epileptogenic ones with higher precision than conventional MRI [129]D.
- PET and Network Analysis: 18F-FDG-PET metabolic networks can help differentiate "temporal plus" epilepsy (involving the insula) from isolated temporal lobe epilepsy (TLE) [132]D.
Electrodiagnostic Studies
EEG remains the gold standard for supporting a diagnosis of epilepsy, though its sensitivity is limited in the interictal period.
- Sleep-Deprived EEG: While sleep deprivation is commonly used to increase the yield of IEDs, meta-analyses show conflicting evidence regarding its overall diagnostic superiority over standard EEG [115]. In pediatric populations, 5 mg of melatonin is an effective and better-tolerated alternative to sleep deprivation for inducing sleep during nap-EEGs [116].
- Video-EEG Monitoring (VEM): Long-term VEM is the definitive tool for capturing semiology and simultaneous electrographic correlates. It is crucial for distinguishing sleep-related hypermotor epilepsy (SHE) from disorders of arousal (DoA) [130]D.
- Cortical Myoclonus Studies: In conditions like Familial Adult Myoclonus Epilepsy (FAME), electrophysiological studies must demonstrate cortical hyperexcitability to differentiate the tremor-like myoclonus from (ET) [118]D.
Diagnostic Algorithm
The following protocol should be used when a patient presents with a transient loss of consciousness or paroxysmal motor event:
- Step 1: Clinical History and Semiology: Obtain a detailed description from witnesses. Use the STAMP scale (Scale for Objective Diagnostic Components of Paroxysmal Events) to grade the likelihood of ES vs. syncope [139]D. Review home videos if available, as they have high diagnostic accuracy for functional seizures [122][130]D.
- Step 2: Immediate Post-Event Bloods: Within 60 minutes, draw serum lactate, ammonia, and prolactin. Elevated lactate (>2.5 mmol/L) strongly suggests ES over syncope or PNES [121].
- Step 3: Baseline EEG and MRI: Perform a standard EEG to look for IEDs. Order a high-resolution MRI (3T preferred) with an epilepsy protocol to rule out structural lesions like FCD or MVNT [117]C[129]D.
- Step 4: Specialized Testing: If the diagnosis remains uncertain, proceed to sleep-deprived EEG or VEM. For suspected autoimmune cases, check for neural antibodies and consider plasma metabolomics [141]D. For suspected FAME, perform electrophysiological testing for cortical myoclonus [118]D.
- Step 5: Cardiorespiratory Monitoring: In focal epilepsy, monitor for ictal central apnea (ICA), which may be a marker for specific genetic etiologies like DEPDC5 mutations and carries a risk for SUDEP [128]D[131]D.
| Test | Finding in Epilepsy | Timing | Sensitivity | Specificity |
|---|---|---|---|---|
| Serum Lactate | Elevated (>2.5 mmol/L) | <60 min post-event | High (for GTCS) | High |
| Serum Prolactin | Significant rise | 20–60 min post-event | Moderate | High |
| Interictal EEG | IEDs (spikes/waves) | Any time | Low (25-50%) | High |
| Video-EEG | Ictal electrographic discharge | During event | Gold Standard | Very High |
| MRI (3T) | FCD, MVNT, or Sclerosis | Any time | Moderate | High |
| Home Video | Stereotyped semiology | During event | Moderate | High [122][130]D |
Surgical and Interventional Management
- ▸Resective surgery is the most effective treatment for drug-resistant focal epilepsy, with complete EZ resection being the primary predictor of success [108, 144].
- ▸SEEG is the preferred invasive monitoring modality for deep-seated or complex networks due to its lower morbidity compared to subdural grids [101, 146].
- ▸Neuromodulation (VNS, RNS, DBS) serves as a critical palliative option for patients who are not candidates for resective surgery [74, 156, 164].
Surgical intervention is the definitive treatment for the approximately 33% of epilepsy patients who remain drug-resistant despite optimized medical therapy [144]. While resective surgery remains the gold standard for achieving seizure freedom, the field is rapidly evolving toward personalized, network-based interventions and minimally invasive techniques [165]D. Early surgical referral is critical, particularly in pediatric populations with focal cortical dysplasia (FCD), where intervention prior to meeting formal drug-resistance criteria may improve long-term neurodevelopmental and seizure outcomes [160]D.
Step 1: Presurgical Evaluation and Localization
The primary goal of the presurgical workup is to delineate the epileptogenic zone (EZ) while preserving eloquent cortex. This often requires a transition from non-invasive monitoring to invasive intracranial electroencephalography (iEEG).
- Multimodal Mapping: Utilize 3T MRI, PET, and ictal SPECT to identify structural and functional abnormalities. In cases of polymicrogyria (PMG), surgical success depends heavily on identifying the specific localized network, as PMG-related epilepsy often involves complex cortical malformations [147].
- Stereoelectroencephalography (SEEG): SEEG is preferred over subdural grids for its ability to sample deep-seated structures (e.g., the cingulate gyrus or insula) with lower morbidity [101]D[146]. For planning, dedicated MR arteriography-venography (MRAV) is superior to standard contrast-enhanced T1-weighted MRI for visualizing vascular structures and planning avascular trajectories to minimize hemorrhage risk [161]D.
- Electrode Implantation: Robot-assisted SEEG implantation offers comparable accuracy and safety to traditional frame-based methods while potentially increasing procedural efficiency [150].
Step 2: Resective and Disconnective Procedures
Resective surgery aims for the complete removal of the EZ, which is the strongest predictor of postoperative seizure freedom [108]D.
- Anterior Temporal Lobectomy (ATL): The most common procedure for mesial temporal lobe epilepsy (MTLE). In patients over 50 years of age or those with significant comorbidities, temporal lobe disconnection may be a safer alternative to formal resection, reducing the risk of vascular complications [155]C.
- Lesionectomy: Targeted resection of highly epileptogenic lesions such as gangliogliomas. Postoperative seizure freedom is high, and anti-seizure medication (ASM) withdrawal can often be considered within 2 years if the patient remains seizure-free [154].
- Hemispherectomy: In infants with catastrophic hemispheric epilepsy, modified functional hemispherectomy (combining hemispherotomy and anatomical resection) is effective and physiologically tolerated, despite the young age [162]D.
- Corpus Callosotomy: A palliative procedure for drop attacks. Total corpus callosotomy (TCC) provides superior seizure reduction compared to anterior (ACC) or posterior (PCC) callosotomy, though it carries a higher risk of disconnection syndrome [153].
Step 3: Minimally Invasive Interventions
Laser Interstitial Thermal Therapy (LITT) has emerged as a significant alternative for patients seeking less invasive options or those with deep-seated lesions.
- LITT Protocol: Under real-time MRI thermometry, a laser fiber is used to ablate the EZ. In nontumoral epilepsy, LITT offers shorter hospital stays and faster recovery than open surgery, though open resection may still provide slightly higher rates of complete seizure freedom [144].
- Special Populations: In children with (TSC), LITT can target specific tubers, leading to significant reductions in seizure frequency and potentially allowing for a reduction in ASM burden [166]D. For tumor-associated epilepsy, LITT can be combined with a stereotactic biopsy in a single session to provide histomolecular diagnosis before ablation [168]D.
Step 4: Neuromodulation for Non-Resectable Epilepsy
When the EZ involves eloquent cortex or is multifocal, neuromodulation is the preferred strategy.
- Vagus Nerve Stimulation (VNS): A palliative option that reduces seizure frequency and may decrease the incidence of status epilepticus in pediatric populations [74].
- Responsive Neurostimulation (RNS): A closed-loop system that detects and stimulates in response to specific electrographic patterns. Targeting the pulvinar nucleus with RNS is an emerging strategy for refractory posterior quadrant epilepsy [156]C.
- Deep Brain Stimulation (DBS): Typically targets the anterior nucleus of the thalamus (ANT). For multifocal drug-resistant epilepsy, 4-lead DBS systems are being utilized to cover broader seizure networks [164]D.
Step 5: Intraoperative Guidance and Monitoring
To optimize the extent of resection, surgeons utilize real-time feedback mechanisms.
- Intraoperative Ultrasound (ioUS): Provides real-time anatomical feedback to account for brain shift after craniotomy [108]D.
- Intraoperative Electrocorticography (iECoG): Used to delineate the EZ acutely. High-density (HD) grids are more effective at detecting sporadic interictal activity than standard strip electrodes [167]D. The absence of epileptiform activity on post-resection iECoG is associated with improved seizure outcomes in pediatric patients [159]D.
- Functional Mapping: In the language-dominant hemisphere, asleep-awake-asleep (AAA) anesthesia allows for intraoperative language mapping, which is essential to minimize postoperative language decline [158]D.
Step 6: Postoperative and Transition
Postoperative care focuses on monitoring for complications and assessing cognitive changes.
- Cognitive Assessment: Patients must be monitored for declines in language (specifically confrontation naming) and executive function [149][152]. Language outcomes should be formally assessed within the first 2 years post-surgery [149].
- ASM Titration: ASM withdrawal should be gradual. In patients with post-stroke epilepsy or vascular insults, the decision to taper medications depends on achieving at least 12-24 months of seizure freedom [148].
| Intervention | Primary Indication | Typical Outcome | Key Risk/Complication | Evidence Level |
|---|---|---|---|---|
| Open Resection | Focal DRE, MRI-positive | High seizure freedom | Language/Memory decline | 2a [144][152] |
| LITT | Deep lesions (e.g., HH), TSC | Minimally invasive | Visual field deficits | 2a [144][166]D |
| SEEG | EZ Localization | Diagnostic accuracy | Intracranial hemorrhage | 2a [146][157]C |
| VNS | Multifocal DRE, Palliative | Seizure frequency reduction | Hoarseness, cough | 2b [74] |
| DBS (ANT) | Multifocal/Generalized DRE | Seizure frequency reduction | Depression, paresthesia | 5 [164]D |
| Callosotomy | Drop attacks, Atonic seizures | Reduction in falls | Disconnection syndrome | 2a [153] |
Special Populations: Pediatrics, Pregnancy, and Geriatrics
- ▸Levetiracetam is effective and cardiac-safe for pediatric epilepsy monotherapy [284, 288].
- ▸Perampanel shows a 47.4% responder rate at 12 months in children as young as 7 months [290].
- ▸In utero exposure to lamotrigine and levetiracetam does not appear to impair long-term neurocognition [289].
- ▸Severe maternal morbidity is a risk factor for epilepsy in offspring [294].
- ▸Late-onset epilepsy (LOE) in seniors is frequently comorbid with TBI, stroke, and hydrocephalus [293, 299].
- ▸Sedatives like propofol and midazolam can mask epileptiform activity on EEG [287].
Pediatrics
Pediatric epilepsy management requires addressing unique etiologies, such as tubulinopathies, which present with significant genotypic and phenotypic heterogeneity. Variants in genes like TUBA1A, TUBB2A, and TUBB3 are associated with diverse neurodevelopmental disorders and seizure profiles [292]C. Recent evidence highlights the efficacy of Levetiracetam (LEV) as a primary treatment; a 2026 meta-analysis confirms its favorable pharmacokinetics and efficacy in achieving seizure freedom and ≥50% responder rates in children up to 16 years of age [284]. Furthermore, longitudinal data indicates that one year of LEV monotherapy in children with genetic generalized epilepsy does not significantly alter cardiac repolarization or echocardiographic parameters [288]C.
For drug-resistant epilepsy (DRE) in young children, adjunctive therapies show promise. Perampanel (PER) administered to children aged 7–46 months resulted in a 39.5% responder rate at 3 months, increasing to 47.4% by 12 months [290]. Cenobamate has also emerged as a viable adjunctive option for pediatric focal DRE, though data remains more limited than in adults [301]. In developmental and epileptic encephalopathies (DEEs) such as Dravet and Lennox-Gastaut syndromes, pharmaceutical-grade cannabidiol (CBD) is effective, though its impact varies by age band and clobazam co-medication [285].
Beyond pharmacology, the psychosocial burden is significant. Stigma negatively impacts the social, emotional, and physical wellbeing of children [291]. Families often engage in intensive 'information work' to manage the intersection of sleep disturbances and seizures, highlighting the need for behavioral sleep interventions [286]. Additionally, children with intellectual disabilities face a higher risk of incident challenging behaviors following the onset of new physical health or sensory impairments [296].
Pregnancy and Maternal Factors
Management during pregnancy necessitates balancing seizure control with fetal neurodevelopment. A 2026 cohort study found that in utero exposure to levetiracetam and lamotrigine monotherapies was not associated with poorer neurocognitive outcomes in children aged 3–18 years compared to unexposed controls [289]C. However, maternal health during gestation significantly influences offspring risk; severe maternal morbidity (SMM) occurring between 20 weeks’ gestation and 42 days postpartum is associated with an increased risk of epilepsy diagnosis in the child [294].
Geriatrics and Late-Onset Epilepsy
Epilepsy in older adults (≥65 years) is categorized into early-onset persistent epilepsy (EOPE) and late-onset epilepsy (LOE). LOE is increasingly relevant in aging populations and may be bidirectionally associated with other neurologic conditions. For instance, older veterans with traumatic brain injury (TBI) show an increased incidence of epilepsy, while pre-existing epilepsy may also predispose individuals to TBI [299]. Furthermore, adult-onset hydrocephalus is linked to an increased hazard ratio for incident epilepsy [293]. In clinical practice, the use of sedatives like midazolam and propofol in the ICU can reduce the diagnostic yield of EEG for detecting epileptiform activity in patients with altered consciousness [287].
Health Disparities and Systemic Factors
Outcomes in epilepsy are influenced by geographic and socioeconomic factors. Rural residence in the United States is associated with disparities in clinical outcomes, likely due to limited access to specialized epilepsy centers and neurologists [277]. Additionally, tumor-related epilepsy, such as that seen in pleomorphic xanthoastrocytomas (PXAs), often presents with unrecognized focal seizures prior to diagnosis, emphasizing the need for early neurophysiologic evaluation [276].
| Medication | Age Group | Outcome Metric | Result |
|---|---|---|---|
| Perampanel | 7–46 months | 12-month Responder Rate | 47.4% [290] |
| Cenobamate | Pediatrics | Focal Seizure Reduction | Effective (Real-world) [301] |
| Cannabidiol | All Ages (DEE) | Seizure Frequency | Significant Reduction [285] |
Landmark Trials and Key Evidence
- ▸The speed of second-line ASM administration in status epilepticus is a more significant predictor of outcome than the specific drug choice [192].
- ▸Cenobamate demonstrates high efficacy in drug-resistant focal epilepsy but requires a slow titration starting at 12.5 mg to ensure safety [197, 200].
- ▸Routine ASM prophylaxis is not recommended for seizure-naive glioma patients, as it does not significantly reduce the risk of future epilepsy [193].
The of has been fundamentally shaped by large-scale randomized controlled trials (RCTs) that define the efficacy of (ASMs), the timing of interventions in , and the role of surgical or neuromodulatory treatments. Modern evidence emphasizes not only seizure freedom but also the prevention of long-term neurodevelopmental sequelae and the identification of biomarkers for (SUDEP) [68][202].
ESETT (Secondary Analysis): Real-World Status Epilepticus Timelines
Design: Secondary analysis of a multicenter RCT | N: Patients aged ≥2 years | Population: Generalized convulsive status epilepticus (SE) unresponsive to | Intervention: , , or | Primary Outcome: Adherence to guideline-recommended treatment timeframes.
Key Result: While the primary ESETT trial established the equivalence of second-line ASMs, this secondary analysis revealed significant real-world delays in treatment administration [192]. Adherence to the recommended 10-minute window for second-line therapy was frequently missed, potentially worsening neurological outcomes [192].
Clinical Impact: This evidence underscores that the choice of drug (fosphenytoin vs. levetiracetam) may be less critical than the speed of administration. It reinforces the need for standardized protocols to minimize the interval between benzodiazepine failure and second-line initiation.
Cenobamate Asian Multinational Study (C035 / NCT04557085)
Design: Randomized, double-blind, placebo-controlled | N: 547 | Population: Adults with uncontrolled focal seizures despite 1–3 ASMs | Intervention: Cenobamate 100, 200, or 400 mg/day vs. Placebo | Primary Outcome: Percent change in 28-day seizure frequency.
Key Result: Cenobamate demonstrated a dose-dependent reduction in seizure frequency. In the 400 mg group, the median reduction was significantly higher than placebo [200]. Post-hoc analyses showed that even during the early titration phase (starting at 12.5 mg/day), significant seizure reduction was observable [197]. Furthermore, cenobamate was effective across all focal seizure subtypes, including focal aware motor (FAM), focal impaired awareness (FIA), and focal to bilateral tonic-clonic (FBTC) seizures [203].
Clinical Impact: Cenobamate has emerged as a highly potent option for drug-resistant focal epilepsy. The evidence supports a slow titration protocol to mitigate the risk of severe adverse events like DRESS syndrome while maintaining efficacy [65][197].
SPRING RCT: Prophylaxis in Glioma Surgery
Design: Randomized controlled trial | N: Seizure-naive patients with newly diagnosed glioma | Population: Patients undergoing neurosurgery | Intervention: Prophylactic levetiracetam (pre-op and ≥1 year post-op) vs. No prophylaxis | Primary Outcome: >50% reduction in the risk of developing seizures.
Key Result: The trial found that routine prophylactic levetiracetam in seizure-naive glioma patients did not produce a meaningful reduction in the risk of developing future seizures [193].
Clinical Impact: This trial challenges the common neurosurgical practice of routine ASM prophylaxis in all brain tumor patients, suggesting that treatment should be reserved for those who experience a clinical seizure or are at exceptionally high risk.
PACIFIC Trial: Bexicaserin in DEEs
Design: Phase 1b/2a randomized, double-blind trial | N: Adolescents and adults | Population: Developmental and epileptic encephalopathies (DEEs), including and | Intervention: Bexicaserin (5-HT2C receptor agonist) vs. Placebo | Primary Outcome: Safety, tolerability, and seizure frequency.
Key Result: Bexicaserin, a novel selective 5-HT2C agonist, showed a favorable safety profile and a reduction in seizure frequency across multiple DEE types [201].
Clinical Impact: This trial provides a potential new therapeutic pathway for refractory DEEs, expanding the armamentarium beyond traditional sodium channel blockers or GABAergic agents.
MONARCH and ADMIRAL: Zorevunersen in Dravet Syndrome
Design: Phase 1-2a open-label, multicenter studies | N: Patients aged 2–18 years | Population: Dravet syndrome with SCN1A haploinsufficiency | Intervention: Zorevunersen (antisense oligonucleotide) | Primary Outcome: Safety and NaV1.1 up-regulation.
Key Result: Zorevunersen was designed to specifically up-regulate NaV1.1 sodium channels to counteract the genetic deficit in Dravet syndrome [172]. Early data suggest the approach is feasible and well-tolerated.
Clinical Impact: This represents a shift toward precision medicine and gene-targeted therapies in epilepsy, moving beyond symptomatic seizure control to addressing the underlying genetic etiology [172].
PREVeNT Trial: Vigabatrin in (TSC)
Design: Phase IIb, multicenter, double-blind RCT | N: 84 infants | Population: Infants with TSC | Intervention: Early vigabatrin (initiated upon EEG changes) vs. Delayed vigabatrin (initiated after first clinical seizure) | Primary Outcome: Neurodevelopmental outcomes at 36 months.
Key Result: Early intervention with vigabatrin in infants with TSC-related EEG abnormalities did not significantly alter the long-term incidence of or intellectual disability at 36 months compared to waiting for the first seizure [202].
Clinical Impact: While vigabatrin remains a first-line treatment for TSC-associated spasms, this trial highlights the complexity of preventing neurodevelopmental comorbidities in genetic epilepsies.
BIA-2093-213: Post-Stroke Epilepsy Prevention
Design: Phase 2a, randomized, double-blind, placebo-controlled | N: Adults with acute stroke | Population: High risk for post-stroke epilepsy (SeLECT score ≥5) | Intervention: vs. Placebo | Primary Outcome: Incidence of unprovoked seizures.
Key Result: This proof-of-concept trial investigated the antiepileptogenic potential of eslicarbazepine in patients with high-risk features (e.g., cortical involvement, large artery atherosclerosis) [194].
Clinical Impact: It establishes a framework for using clinical scoring systems (SeLECT) to identify patients who may benefit from prophylactic antiepileptogenic therapy after an ischemic or hemorrhagic event [194][207].
| Trial | Year | Population | Intervention | Key Finding |
|---|---|---|---|---|
| ESETT (Analysis) [192] | 2026 | Convulsive SE | Fosphenytoin vs. LEV vs. VPA | Real-world delays in treatment are common; speed is critical. |
| SPRING [193] | 2026 | Seizure-naive Glioma | Levetiracetam Prophylaxis | No meaningful reduction in seizure risk vs. no prophylaxis. |
| C035 (Asian) [200] | 2026 | Focal Epilepsy | Cenobamate (100-400mg) | Dose-dependent reduction in focal seizures; high responder rates. |
| PACIFIC [201] | 2026 | DEEs (Dravet/LGS) | Bexicaserin | Selective 5-HT2C agonism reduces seizures in encephalopathies. |
| PREVeNT [202] | 2025 | TSC Infants | Early Vigabatrin | Early treatment did not prevent ASD/ID at 36 months. |
| PEACH [196] | 2026 | Supratentorial ICH | Levetiracetam | Explored EEG biomarkers to guide personalized prophylaxis. |
| Medication | Population | Evidence Level | Clinical Consideration |
|---|---|---|---|
| Cenobamate | Focal Epilepsy | 1b | Highest efficacy in drug-resistant cases; slow titration required. |
| Brivaracetam | Focal Epilepsy | 5 | High affinity for SV2A; often used as alternative to levetiracetam. |
| Lacosamide | Focal Epilepsy | 5 | Sodium channel slow-inactivator; well-tolerated in polytherapy. |
| Perampanel | Focal Epilepsy | 5 | AMPA receptor antagonist; long half-life; monitor for behavioral side effects. |
Guidelines and Resources
- ▸Valproate should be avoided in pregnancy due to high risks of major congenital malformations and cognitive impairment.
- ▸Prophylactic ASMs are not recommended for patients with brain tumors who have not had a seizure.
- ▸Lamotrigine, levetiracetam, and carbamazepine are preferred first-line monotherapies for focal epilepsy.
- ▸ASM tapering after 2 years of seizure freedom in adults doubles the recurrence risk (15% vs 7%).
- ▸Psychological interventions are the primary treatment for functional seizures.
- ▸Structural MRI is essential for infants with new-onset epilepsy due to high rates of structural abnormalities.
Clinical Practice Guidelines for Antiseizure Medication (ASM)
The management of epilepsy is guided by evidence-based protocols from the American Academy of Neurology (AAN), the International League Against Epilepsy (ILAE), and the American Epilepsy Society (AES). For patients with new-onset focal epilepsy, lamotrigine is recommended (Level B), while levetiracetam and zonisamide are also established options [217]. In pediatric and adult populations with focal onset seizures, carbamazepine, lamotrigine, or levetiracetam are recommended as first-line monotherapy [222]. While oxcarbazepine is an alternative for children, its evidence level varies [222]. For generalized tonic-clonic seizures, data on the efficacy of third-generation ASMs remain limited [217].
Management in Special Populations
Pregnancy and Childbearing Potential
Updated 2024 guidelines emphasize the risks of in utero exposure to ASMs. Valproate (VPA) exposure in the first trimester carries a significantly higher risk of major congenital malformations (MCMs) compared to carbamazepine, and likely higher than phenytoin or lamotrigine [215], [233]. Polytherapy further increases the risk of MCMs and reduced cognitive outcomes compared to monotherapy [233]. Preconceptional folic acid supplementation is possibly effective in reducing MCM risk [231]. Regarding obstetric outcomes, there is no substantially increased risk (>2 times expected) of cesarean delivery or late pregnancy bleeding for women with epilepsy [232]. While primidone and levetiracetam transfer into breast milk, the clinical impact on infants requires careful monitoring [231].
Brain Tumors and Cavernomas
In patients with newly diagnosed brain tumors who have not experienced a seizure, clinicians should not routinely prescribe prophylactic ASMs to reduce the risk of a first seizure [220]. For cavernoma-related epilepsy (CRE), surgical resection is a primary consideration, though seizure freedom is achieved in only approximately 75% of cases, often due to inadequate definition of the epileptogenic zone [224].
Diagnostic and Monitoring Standards
Neuroimaging and EEG
Structural MRI is recommended for infants (1–24 months) presenting with a first afebrile seizure or new-onset epilepsy, as structural abnormalities are frequent in this age group [302]. In older pediatric populations, nearly 50% of imaging studies in localization-related epilepsy are abnormal, with 2–4% providing information that immediately alters medical management [221]. Minimum standards for routine and sleep EEG have been established by the IFCN and ILAE to ensure diagnostic consistency [218].
Therapeutic Drug Monitoring (TDM)
While randomized studies are lacking, TDM is clinically valuable for establishing an individual's therapeutic concentration once a desired clinical outcome is reached [216]. It is particularly indicated when assessing changes in drug response, suspected toxicity, or adherence [216].
Long-term Management and Withdrawal
ASM Withdrawal
In adults who have been seizure-free for 2 years, the risk of recurrence after tapering ASMs is approximately 15%, compared to 7% in those who continue medication [219]. In pediatric patients, there is no significant difference in recurrence risk between tapering after 2 years versus 4 years of seizure freedom [219].
Functional Seizures
Management of functional (psychogenic non-epileptic) seizures should prioritize psychological interventions, which are possibly effective in increasing seizure freedom, reducing anxiety, and improving psychosocial functioning [226].
Wearable Technology
Automated seizure detection using wearable devices is now recommended for outpatient and ambulatory settings to improve seizure frequency tracking and safety [227], [228].
| Seizure Type | Recommended ASMs | Evidence Level |
|---|---|---|
| New-onset Focal (Adult) | Lamotrigine, Levetiracetam, Zonisamide | Level B [217] |
| Focal Monotherapy (Pediatric) | Carbamazepine, Lamotrigine, Levetiracetam | Strong [222] |
| Focal Monotherapy (Alternative) | Oxcarbazepine | Level A/C [222] |
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