{ "schemaVersion": 2, "eyebrow": "Neurology", "title": "Generalized Tonic-Clonic Seizure", "summary": "Manage an ongoing convulsion as status epilepticus at 5 minutes while establishing airway protection and reversible causes. After stabilization, distinguish generalized-onset epilepsy from focal-to-bilateral tonic-clonic seizure, acute symptomatic seizure, convulsive syncope, and eclampsia to guide EEG, imaging, recurrence counseling, and antiseizure therapy.", "seoDescription": "Physician approach to generalized tonic-clonic seizure: emergency treatment, etiologic workup, EEG and imaging interpretation, and treatment selection.", "clinicalQuestion": "How should physicians stabilize, evaluate, classify, and prevent recurrence after a generalized tonic-clonic seizure?", "specialty": "Neurology", "audience": "U.S. physicians and medical trainees", "tags": [ "generalized tonic-clonic seizure", "convulsive status epilepticus", "first unprovoked seizure", "EEG", "antiseizure medication", "eclampsia" ], "keyTakeaways": [ "Treat continuing generalized tonic-clonic activity lasting more than 5 minutes as a neurologic emergency; initiate benzodiazepine therapy while airway, breathing, circulation, and diagnostic measures proceed. [13][15]", "Do not infer generalized onset from bilateral convulsions alone: focal seizures can evolve to bilateral tonic-clonic seizures, and generalized tonic-clonic seizures can have asymmetric or focal-appearing features. [12][19]", "For a first apparent seizure, prioritize serum glucose, sodium, calcium, and magnesium testing; select imaging, lumbar puncture, toxicology testing, and pregnancy-specific evaluation from the clinical context. [3][20]", "Generalized spike-wave discharges after a first unprovoked tonic-clonic seizure identify a high untreated recurrence risk; treatment decisions should incorporate the electroclinical syndrome and reproductive potential. [7][10][22]", "In women and girls of childbearing potential with generalized-onset seizures, lamotrigine or levetiracetam should be offered as first-line monotherapy rather than valproate. [22]" ], "sections": [ { "id": "emergency-management", "eyebrow": "Immediate action", "heading": "Treat ongoing convulsions before completing the diagnostic workup", "intro": "Use the observed or reliably reported seizure duration to determine urgency.", "paragraphs": [ "Start resuscitative management immediately for active generalized convulsive seizures: address airway, breathing, and circulation while obtaining bedside glucose and pursuing the cause. Benzodiazepines—diazepam, midazolam, or lorazepam—are acceptable first-line agents for a continuing convulsion; monitor closely for respiratory depression. [15]", "Initiate status epilepticus treatment when generalized tonic-clonic seizure activity exceeds 5 minutes. Although video-EEG data have proposed 2 minutes as a practical point to consider rescue treatment for a prolonged convulsion, the 5-minute threshold remains the cited status-treatment trigger. [8][13]", "If seizure activity persists after two benzodiazepine doses, use an intravenously administered second-line antiseizure medication with appropriate monitoring: fosphenytoin/phenytoin, levetiracetam, phenobarbital, or valproic acid are listed options for established status epilepticus. [22]" ], "bullets": [ "Document onset time, witnessed tonic and clonic phases, recovery trajectory, and all prehospital or emergency benzodiazepine doses; duration determines escalation urgency. [12][13]", "Treat hypoglycemia or clinically important electrolyte derangement promptly when identified, rather than labeling the event unprovoked. Serum glucose, sodium, calcium, and magnesium are the highest-yield routine chemistry targets. [3]", "Obtain urgent neurologic assessment when consciousness does not recover as expected, because electrographic status epilepticus may persist despite cessation of visible motor activity. [2][15]" ], "subsections": [], "table": { "caption": "Escalation framework for an active generalized convulsion. [8][13][15][22]", "columns": [ "Clinical state", "Immediate action", "Decision point" ], "rows": [ [ "Convulsion in progress", "Stabilize airway, breathing, and circulation; check bedside glucose; administer a benzodiazepine while evaluating the cause. [15]", "Do not delay treatment for imaging, EEG, or laboratory results. [15]" ], [ "Convulsion lasting >2 minutes", "Consider rescue treatment because this duration has been proposed as prolonged convulsive seizure activity. [8]", "Risk of nontermination rises with ongoing seizure duration; continue timed reassessment. [8]" ], [ "Convulsion lasting >5 minutes", "Treat as status epilepticus with an organized emergency treatment cascade. [13]", "Escalate beyond initial benzodiazepine treatment if seizures continue. [13][22]" ], [ "Persistent seizures after two benzodiazepine doses", "Give IV fosphenytoin/phenytoin, levetiracetam, phenobarbital, or valproic acid with appropriate monitoring. [22]", "Choose the agent in context of seizure classification, comorbidity, pregnancy potential, and monitoring capacity. [22]" ] ] } }, { "id": "classify-the-event", "eyebrow": "Diagnostic branch point", "heading": "Confirm an epileptic convulsion and determine whether onset was generalized or focal", "intro": "The correct seizure classification determines the imaging differential and long-term medication strategy.", "paragraphs": [ "A generalized tonic-clonic seizure has a tonic phase of sustained muscle activity followed by clonic jerks that progressively slow before termination; loss of consciousness occurs during the event and postictal period. Bilateral motor activity need not be symmetric, and forced head version or other focal-appearing signs can occur in generalized tonic-clonic seizures. [12]", "Obtain a witness history that captures abrupt loss of consciousness, the sequence of tonic then clonic activity, any initial cry, lateral tongue injury, and postictal confusion. Lateral tongue biting supports a convulsive seizure, but urinary incontinence is neither required nor sufficiently discriminating alone. [15]", "Actively seek focal onset evidence: a preceding aura, stereotyped focal motor or nonmotor symptoms, focal EEG discharges, or focal structural imaging abnormalities support focal epilepsy with evolution to bilateral tonic-clonic seizure. In a first unprovoked tonic-clonic seizure, temporal or frontal lobe epilepsy, focal EEG abnormalities, and focal imaging changes were associated with increased focal-to-bilateral tonic-clonic recurrence risk. [5][19]", "Do not start chronic antiseizure medication for brief convulsive movements occurring at the end of syncope without evidence of epilepsy. Adults and children with syncope can have short generalized tonic-clonic movements during the attack, and those events should not be treated as epileptic seizures solely on that basis. [4]" ], "bullets": [ "Generalized spike-wave discharges on EEG after a first unprovoked tonic-clonic seizure support a generalized epilepsy pattern and identify a high risk of recurrence without treatment. [7][10]", "Ask specifically about sporadic myoclonic jerks, absence episodes, and seizures after awakening; these findings help identify genetic generalized epilepsy syndromes and predict further generalized tonic-clonic seizures. [5][12]", "Do not exclude generalized onset because of asymmetry or head version; reconcile semiology with EEG and brain imaging before assigning focal epilepsy. [12]" ], "subsections": [], "table": { "caption": "Features that redirect classification after a bilateral tonic-clonic convulsion. [4][5][7][10][12][19]", "columns": [ "Pattern", "Supporting findings", "Next action" ], "rows": [ [ "Generalized-onset epilepsy", "Generalized spike-wave EEG discharges; concurrent absence or myoclonic seizures; first seizure after awakening. [5][7][10][12]", "Select an antiseizure medication appropriate for generalized-onset seizures and assess reproductive potential before choosing valproate. [22]" ], [ "Focal to bilateral tonic-clonic seizure", "Aura or focal onset; focal EEG discharges; focal lesion on brain imaging; temporal or frontal epilepsy pattern. [5][19]", "Pursue structural etiology evaluation and choose therapy for focal epilepsy after specialist classification. [5][19]" ], [ "Convulsive syncope", "Brief generalized convulsive movements at the end of a syncopal attack. [4]", "Evaluate the cause of syncope; do not prescribe chronic antiseizure therapy solely for these movements. [4]" ], [ "Uncertain onset", "Witnessed loss of consciousness with bilateral tonic, clonic, tonic-clonic, or atonic motor manifestations, but insufficient onset information. [1]", "Use EEG, brain imaging, and longitudinal semiology rather than assuming generalized epilepsy. [5][7][19]" ] ] } }, { "id": "etiologic-workup", "eyebrow": "First presentation", "heading": "Separate acute symptomatic seizures from unprovoked epilepsy", "intro": "Identify reversible metabolic, toxic, infectious, structural, and pregnancy-related causes before assigning an epilepsy diagnosis.", "paragraphs": [ "For an adult with a first convulsive seizure, obtain targeted serum chemistry testing with emphasis on glucose, sodium, calcium, and magnesium. A broader standard evaluation has included CBC, electrolytes, blood urea nitrogen, creatinine, calcium, and magnesium, but testing should be driven by the presentation rather than performed as an undifferentiated panel. [3]", "Use neuroimaging when the clinical context raises concern for a structural lesion or an alternative acute intracranial diagnosis. Focal neurologic findings, focal EEG discharges, or focal imaging abnormalities change both classification and recurrence counseling toward focal epilepsy. [5][19]", "Reserve lumbar puncture, toxicology testing, and expanded laboratory testing for a compatible history or examination. In pregnancy, evaluate medications, substance exposure, and medical comorbidity; CBC, glucose, electrolytes, urine protein assessment, lumbar puncture, toxicology studies, and CT or MRI may be useful according to circumstances. [20]", "In adolescents and adults, the etiologic differential should be age- and context-sensitive: head trauma and infection are prominent causes in adolescents, whereas stroke is a common adult cause of focal seizures. A generalized convulsion can be the bilateral expression of either focal or generalized epilepsy, so imaging and EEG results must be interpreted together. [19]" ], "bullets": [ "Obtain EEG after stabilization when seizure classification or recurrence risk will alter treatment; generalized spike-wave discharges materially increase concern for recurrence after a first unprovoked tonic-clonic seizure. [7][10]", "Prioritize CT or MRI in a pregnant patient with a convulsion when another intracranial cause is under consideration; do not attribute every pregnancy-associated convulsion to eclampsia without evaluating competing etiologies. [20]", "If clinical recovery is delayed or fluctuating after motor activity ends, obtain EEG urgently to assess for nonconvulsive status epilepticus. [2][15]" ], "subsections": [ { "heading": "Pregnancy-associated convulsion", "paragraphs": [ "Treat eclampsia as a leading diagnosis when a generalized tonic-clonic convulsion occurs in a patient with a hypertensive disorder of pregnancy and no alternative medical cause. Eclampsia is defined by one or more such convulsions and occurs in approximately 0.8% of women with hypertensive disorders of pregnancy. [20]", "A generalized tonic-clonic seizure during pregnancy can cause fetal hypoxia; after maternal stabilization, perform cardiotocography and fetal monitoring and plan delivery in a setting capable of maternal and neonatal resuscitation. [14]" ], "bullets": [ "Severe hypertension, including a reported pressure of 190/110 mm Hg in a pregnancy-associated convulsion, should immediately heighten concern for eclampsia while alternative causes are assessed. [9][20]" ] } ], "table": { "caption": "Etiologic branches and targeted tests after a generalized tonic-clonic seizure. [3][5][19][20]", "columns": [ "Etiologic branch", "Clues", "Tests and next action" ], "rows": [ [ "Metabolic disturbance", "Acute illness, impaired intake, renal dysfunction, medication-related risk, or abnormal bedside glucose. [3]", "Measure glucose, sodium, calcium, and magnesium; correct the identified abnormality and reassess whether the seizure was acute symptomatic. [3]" ], [ "Focal structural epilepsy", "Aura, focal examination finding, focal EEG discharge, or focal imaging abnormality. [5][19]", "Obtain neuroimaging and classify as focal to bilateral tonic-clonic if electroclinical data support focal onset. [5][19]" ], [ "CNS infection or inflammation", "Compatible febrile, meningeal, encephalopathic, or immunocompromised presentation. [2][20]", "Use lumbar puncture and neuroimaging when clinically indicated; treat the identified cause alongside seizure management. [2][20]" ], [ "Toxic or medication-associated seizure", "Exposure history, substance use, or medication history suggesting a provoked event. [20]", "Order toxicology testing when the exposure history or presentation warrants it. [20]" ], [ "Eclampsia or alternate pregnancy-related cause", "Pregnancy with hypertensive disorder, proteinuria assessment needs, or neurologic concern for alternate pathology. [20]", "Evaluate for eclampsia while obtaining targeted laboratory studies and CT or MRI as clinically indicated. [20]" ] ] } }, { "id": "recurrence-and-maintenance-treatment", "eyebrow": "Long-term management", "heading": "Use EEG phenotype and reproductive potential to select maintenance therapy", "intro": "A first unprovoked convulsion is not managed identically across electroclinical syndromes.", "paragraphs": [ "The decision to start an antiseizure medication after a first unprovoked tonic-clonic seizure remains individualized, but generalized spike-wave discharges on EEG identify a group with high recurrence risk if untreated. Counsel patients that recurrence estimates differ by etiology, EEG pattern, imaging, and seizure phenotype rather than relying on a single pooled estimate. [7][10]", "For generalized-onset seizures in women and girls of childbearing potential, offer lamotrigine or levetiracetam as first-line monotherapy. This selection reflects the clinically important reproductive risk tradeoff associated with sodium valproate. [22]", "Valproate has historically been a preferred treatment for idiopathic generalized epilepsy, but levetiracetam is an effective alternative. In a recent comparative study of juvenile myoclonic epilepsy and epilepsy with generalized tonic-clonic seizures alone, one-year seizure-free rates were comparable between levetiracetam and valproate, while time to treatment withdrawal was longer with levetiracetam. [24]", "A study protocol in idiopathic generalized tonic-clonic seizures used levetiracetam 500 mg/day in two divided doses, increasing by 500 mg/week to 2,000 mg/day if needed; valproate began at 500 mg/day and increased by 500 mg/week to 1,500 mg/day in two divided doses, with higher doses after recurrence at clinician discretion. These are study dosing methods, not a substitute for product labeling, patient-specific renal or hepatic assessment, or specialist-directed prescribing. [21]" ], "bullets": [ "If generalized spike-wave EEG is accompanied by absence or myoclonic seizures, avoid treating the presentation as isolated focal epilepsy; the broader generalized syndrome should drive medication selection. [5][7][12]", "For patients whose convulsions recur despite antiseizure medication, verify adherence, reassess seizure classification, and review EEG and imaging for a focal lesion or an incorrectly assigned generalized syndrome. [5][21][24]", "Monitor seizure recurrence, adverse effects, and adherence at planned follow-up; one comparative protocol assessed these outcomes at weeks 4, 12, and 26 after treatment initiation. [21]" ], "subsections": [ { "heading": "Pregnancy and antiseizure medication monitoring", "paragraphs": [ "For women with epilepsy who become pregnant, generalized tonic-clonic seizures require particular prevention because of fetal hypoxia risk. Therapeutic drug monitoring is addressed in pregnancy-focused epilepsy care, and delivery should occur at a facility with maternal and neonatal resuscitation capability when clinically indicated. [14]" ], "bullets": [ "Reassess antiseizure medication selection before conception whenever possible; levetiracetam is specifically favored over valproate for women and girls of childbearing potential with generalized-onset seizures. [22]" ] } ], "table": { "caption": "Medication selection considerations for generalized-onset tonic-clonic seizures. [21][22][24]", "columns": [ "Clinical context", "Treatment direction", "Key tradeoff" ], "rows": [ [ "Woman or girl of childbearing potential with generalized-onset seizures", "Offer lamotrigine or levetiracetam as first-line monotherapy. [22]", "Avoid the reproductive safety concerns that materially constrain valproate use in this population. [22]" ], [ "Idiopathic generalized epilepsy without pregnancy potential considerations", "Valproate remains a historically preferred therapy; levetiracetam is an effective alternative. [24]", "Some patients respond only to valproate, whereas levetiracetam may provide comparable one-year seizure freedom in comparative data. [24]" ], [ "Idiopathic generalized tonic-clonic seizures requiring titration in a study protocol", "Levetiracetam: 500 mg/day divided twice daily, increased by 500 mg/week to 2,000 mg/day if needed; valproate: 500 mg/day, increased by 500 mg/week to 1,500 mg/day in two divided doses. [21]", "Use only with individualized prescribing, adverse-effect surveillance, and pregnancy counseling. [21][22]" ], [ "Persistent convulsive status after two benzodiazepine doses", "Use IV fosphenytoin/phenytoin, levetiracetam, phenobarbital, or valproic acid with monitoring. [22]", "This is acute status treatment, not a maintenance-monotherapy selection algorithm. [22]" ] ] } }, { "id": "disposition-and-follow-up", "eyebrow": "After stabilization", "heading": "Plan follow-up around recurrence risk, classification certainty, and safety", "intro": "The postictal disposition decision depends on recovery, provoked causes, and unresolved diagnostic risk.", "paragraphs": [ "Arrange timely neurology follow-up after a first unprovoked tonic-clonic seizure for EEG interpretation, review of neuroimaging, syndrome classification, and a shared decision about maintenance therapy. The presence of generalized spike-wave discharges, focal EEG abnormalities, or focal imaging changes changes the recurrence discussion and should not be deferred to an unspecified later evaluation. [5][7][10]", "Provide explicit return precautions for another convulsion, prolonged seizure activity, incomplete recovery, or new focal neurologic symptoms. A recurrent convulsion lasting more than 5 minutes requires emergency status epilepticus treatment; a patient with prior status epilepticus, a temporal focus, or a lesional MRI has factors associated with longer seizures in video-EEG data. [8][13]", "Document whether the event was likely acute symptomatic, unprovoked, focal to bilateral tonic-clonic, generalized onset, convulsive syncope, or still uncertain. That working diagnosis determines whether the next step is correction of a reversible cause, epilepsy treatment, cardiac/syncope evaluation, or additional electroclinical characterization. [3][4][5][7][19]" ], "bullets": [ "Reconcile a normal or nonspecific initial history with subsequent witness video, EEG, and imaging rather than making irreversible treatment decisions from the bilateral convulsive phenotype alone. [5][12][19]", "For patients with established epilepsy, review missed doses and serum medication exposure when clinically relevant; low antiseizure medication levels have been associated with status epilepticus in observational data. [8]", "Coordinate obstetric and neurology management for pregnancy-associated seizures, particularly when hypertension or eclampsia remains in the differential. [14][20]" ], "subsections": [], "table": { "caption": "Post-event disposition priorities by diagnostic certainty. [3][4][5][7][10][13][20]", "columns": [ "Working diagnosis", "Priority before discharge or transfer", "Follow-up focus" ], "rows": [ [ "Acute symptomatic seizure", "Correct and document the metabolic, toxic, infectious, structural, or pregnancy-related trigger. [3][20]", "Confirm resolution of the trigger and reassess future seizure risk in the responsible specialty context. [3][20]" ], [ "First unprovoked seizure with generalized spike-wave EEG", "Discuss high untreated recurrence risk and initiate syndrome-appropriate treatment planning. [7][10]", "Neurology follow-up for generalized epilepsy classification and medication monitoring. [7][22]" ], [ "Suspected focal to bilateral tonic-clonic seizure", "Complete EEG and structural imaging review. [5][19]", "Assess focal lesion and focal epilepsy treatment strategy. [5][19]" ], [ "Pregnancy-associated convulsion", "Assess for eclampsia and alternate neurologic causes; provide maternal stabilization and fetal monitoring. [14][20]", "Coordinate obstetric, neurologic, and neonatal-capable care. [14][20]" ] ] } } ], "faq": [], "references": [ { "number": 1, "title": "Supplementary appendix", "detail": "www.thelancet.com", "url": "https://www.thelancet.com/cms/10.1016/S2214-109X(25)00096-8/attachment/7fc731ab-ecf9-4976-b2b1-e2f74b404636/mmc1.pdf", "authors": "www.thelancet.com", "host": "www.thelancet.com" }, { "number": 2, "title": "Publication OnlyEBMT 2014", "detail": "www.nature.com", "url": "https://www.nature.com/articles/bmt201450.pdf", "authors": "www.nature.com", "host": "www.nature.com" }, { "number": 3, "title": "EVALUATION OF THE PATIENT WITH SEIZURES: AN EVIDENCE BASED APPROACH - ScienceDirect", "detail": "www.sciencedirect.com", "url": "https://www.sciencedirect.com/science/article/abs/pii/S0733862705700535", "authors": "www.sciencedirect.com", "host": "www.sciencedirect.com" }, { "number": 4, "title": "Tonic-Clonic Seizure - an overview", "detail": "www.sciencedirect.com", "url": "https://www.sciencedirect.com/topics/medicine-and-dentistry/tonic-clonic-seizure", "authors": "www.sciencedirect.com", "host": "www.sciencedirect.com" }, { "number": 5, "title": "Epileptology of the first tonic‐clonic seizure in adults and prediction of seizure recurrence - 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ScienceDirect", "detail": "www.sciencedirect.com", "url": "https://www.sciencedirect.com/science/article/abs/pii/S105913112500069X", "authors": "www.sciencedirect.com", "host": "www.sciencedirect.com" } ], "editorialNote": "Prepared from cited clinical literature using Astra's research workflow. Verify recommendations against current guidance and patient-specific factors.", "citations": [ { "number": 1, "title": "Supplementary appendix", "detail": "www.thelancet.com", "url": "https://www.thelancet.com/cms/10.1016/S2214-109X(25)00096-8/attachment/7fc731ab-ecf9-4976-b2b1-e2f74b404636/mmc1.pdf", "authors": "www.thelancet.com", "host": "www.thelancet.com", "snippet": "Generalised convulsive seizures. Level 1. Witnessed sudden loss of consciousness. AND. Generalised tonic, clonic, tonic-clonic, or atonic motor manifestations.", "score": 0.26418555 }, { "number": 2, "title": "Publication OnlyEBMT 2014", "detail": "www.nature.com", "url": "https://www.nature.com/articles/bmt201450.pdf", "authors": "www.nature.com", "host": "www.nature.com", "snippet": "episodes of generalized tonic-clonic seizures. Eletroencepha- logram (EEG) showed status epilepticus. Lumbar puncture was negative for infections and", "score": 0.46249792 }, { "number": 3, "title": "EVALUATION OF THE PATIENT WITH SEIZURES: AN EVIDENCE BASED APPROACH - ScienceDirect", "detail": "www.sciencedirect.com", "url": "https://www.sciencedirect.com/science/article/abs/pii/S0733862705700535", "authors": "www.sciencedirect.com", "host": "www.sciencedirect.com", "snippet": "Title: EVALUATION OF THE PATIENT WITH SEIZURES: AN EVIDENCE BASED APPROACH - ScienceDirect\n# EVALUATION OF THE PATIENT WITH SEIZURES: AN EVIDENCE BASED APPROACH. Seizures are common presenting problems to emergency departments (EDs). A MEDLINE literature search was performed for articles from 1966 t", "score": 0.6244086 }, { "number": 4, "title": "Tonic-Clonic Seizure - an overview", "detail": "www.sciencedirect.com", "url": "https://www.sciencedirect.com/topics/medicine-and-dentistry/tonic-clonic-seizure", "authors": "www.sciencedirect.com", "host": "www.sciencedirect.com", "snippet": "### GENERALIZED TONIC-CLONIC SEIZURES\n\nThere is rarely any difficulty in correctly diagnosing generalized tonic-clonic (GTC) seizures (formerly termed _grand mal seizures_). The only caution is that toddlers with breath-holding attacks and adults and children with syncope may have brief generalized ", "score": 0.44912744 }, { "number": 5, "title": "Epileptology of the first tonic‐clonic seizure in adults and prediction of seizure recurrence - Koutroumanidis - 2018 - Epileptic Disorders - Wiley Online Library", "detail": "onlinelibrary.wiley.com", "url": "https://onlinelibrary.wiley.com/doi/10.1684/epd.2018.1014", "authors": "onlinelibrary.wiley.com", "host": "onlinelibrary.wiley.com", "snippet": "To understand their effect in people with early diagnosed new epilepsy, we assessed the risk of recurrence of focal to bilateral tonic-clonic or generalized tonic-clonic seizures and the associated factors in a clinically well-characterized cohort of adults with a first unprovoked tonic-clonic seizu", "score": 0.27656642 }, { "number": 6, "title": "Factors influencing the duration of generalized tonic–clonic seizure", "detail": "www.sciencedirect.com", "url": "https://www.sciencedirect.com/science/article/pii/S1059131115002800", "authors": "www.sciencedirect.com", "host": "www.sciencedirect.com", "snippet": "### Deep learning–based detection of generalized convulsive seizures using a wrist-worn accelerometer [...] ### Paroxysmal events during prolonged video-video electroencephalography monitoring in refractory epilepsy [...] The mean GTCS duration per patient was 74.6 s. The results indicated that pati", "score": 0.26239195 }, { "number": 7, "title": "Risk of recurrence in patients with an unprovoked tonic–clonic seizure and generalized epileptiform discharges on EEG - Jomaa - 2023 - Epilepsia - Wiley Online Library", "detail": "onlinelibrary.wiley.com", "url": "https://onlinelibrary.wiley.com/doi/10.1111/epi.17671", "authors": "onlinelibrary.wiley.com", "host": "onlinelibrary.wiley.com", "snippet": "# Risk of recurrence in patients with an unprovoked tonic–clonic seizure and generalized epileptiform discharges on EEG. The decision to initiate treatment in patients with a first unprovoked seizure remains controversial. Studies have reported a recurrence rate ranging from 21%–50%, but most have i", "score": 0.23736413 }, { "number": 8, "title": "Duration of focal complex, secondarily generalized tonic–clonic, and primarily generalized tonic–clonic seizures — A video-EEG analysis - ScienceDirect", "detail": "www.sciencedirect.com", "url": "https://www.sciencedirect.com/science/article/pii/S1525505015001286", "authors": "www.sciencedirect.com", "host": "www.sciencedirect.com", "snippet": "Identifying seizures with prolonged duration during video-electroencephalographic (EEG) monitoring is of importance to inform clinicians when to start emergency treatment of seizures to prevent status epilepticus. The aims of this study were to assess the clinical and EEG seizure duration (SD) in co", "score": 0.20505768 }, { "number": 9, "title": "e‐Poster - 2024 - Journal of Obstetrics and Gynaecology ...", "detail": "obgyn.onlinelibrary.wiley.com", "url": "https://obgyn.onlinelibrary.wiley.com/doi/10.1111/jog.16161", "authors": "obgyn.onlinelibrary.wiley.com", "host": "obgyn.onlinelibrary.wiley.com", "snippet": "Within 6 h, she experienced a 1-min generalized tonic-clonic seizure and loss of consciousness. At the ER, her blood pressure was 190/110 mm", "score": 0.20074598 }, { "number": 10, "title": "Risk of recurrence in patients with an unprovoked tonic– ...", "detail": "onlinelibrary.wiley.com", "url": "https://onlinelibrary.wiley.com/doi/abs/10.1111/epi.17671", "authors": "onlinelibrary.wiley.com", "host": "onlinelibrary.wiley.com", "snippet": "by N Jomaa · 2023 · Cited by 10 — Patients with a first unprovoked GTC seizure and evidence of GSWDs on EEG have a high risk of recurrence if left untreated. Valproate is the", "score": 0.67037153 }, { "number": 11, "title": "The pharmacological treatment of epilepsy in adults", "detail": "onlinelibrary.wiley.com", "url": "https://onlinelibrary.wiley.com/doi/full/10.1002/epd2.20093", "authors": "onlinelibrary.wiley.com", "host": "onlinelibrary.wiley.com", "snippet": "by T Tomson · 2023 · Cited by 68 — Randomized clinical trial on the efficacy of antiepileptic drugs in reducing the risk of relapse after a first unprovoked tonic-clonic seizure.", "score": 0.49084634 }, { "number": 12, "title": "A practical guide to the updated seizure classification 2025", "detail": "pmc.ncbi.nlm.nih.gov", "url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC12747708", "authors": "pmc.ncbi.nlm.nih.gov", "host": "pmc.ncbi.nlm.nih.gov", "snippet": "treatment approach differs from that used for IESS (Figure3). _Generalized tonic seizure_ is defined as sustained muscular contraction resulting in stiffness or tense posture, that usually causes an extension, but it may also affect the flexor muscles. The median duration of generalized tonic seizur", "score": 0.67166495 }, { "number": 13, "title": "Refining General Principles of Antiepileptic Drug Treatments for Epilepsy", "detail": "pmc.ncbi.nlm.nih.gov", "url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC7354982", "authors": "pmc.ncbi.nlm.nih.gov", "host": "pmc.ncbi.nlm.nih.gov", "snippet": "Treatment of status epilepticus requires special care since this condition leads to abnormally prolonged seizures, and is considered a neurological emergency.1314 The treatment of status epilepticus should be initiated when generalized tonic-clonic seizures and focal seizures last longer than 5 and ", "score": 0.41122967 }, { "number": 14, "title": "Treatment and care of women with epilepsy before, during, and after pregnancy: a practical guide", "detail": "pmc.ncbi.nlm.nih.gov", "url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC9189531", "authors": "pmc.ncbi.nlm.nih.gov", "host": "pmc.ncbi.nlm.nih.gov", "snippet": "generalized syndromes associated with tonic-clonic seizures’.183 [...] (CTG) should be performed and the fetus should be monitored to prevent respiratory complications,218,220,221 as generalized tonic-clonic seizures are associated with fetus hypoxia.220 Finally, WWE should deliver in a center with ", "score": 0.3727797 }, { "number": 15, "title": "Seizure - StatPearls - NCBI Bookshelf", "detail": "www.ncbi.nlm.nih.gov", "url": "https://www.ncbi.nlm.nih.gov/books/NBK430765", "authors": "www.ncbi.nlm.nih.gov", "host": "www.ncbi.nlm.nih.gov", "snippet": "As with many medical conditions, history is key in assessment and guide further evaluations. The first question posed to the caregiver is whether the event was a seizure or some other type of transient event. A sudden alteration in consciousness with associated motor movements is the common descript", "score": 0.3339163 }, { "number": 16, "title": "Incidence of childhood and youth epilepsy: A population‐based prospective cohort study utilizing current International League Against Epilepsy classifications for seizures, syndromes, and etiologies", "detail": "pmc.ncbi.nlm.nih.gov", "url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC11908673", "authors": "pmc.ncbi.nlm.nih.gov", "host": "pmc.ncbi.nlm.nih.gov", "snippet": "Overall, 622 CYE (59%) had a history of tonic–clonic seizures during follow‐up of epilepsy, including focal, generalized, and unknown onset types. Tonic–clonic seizures were most frequent in CYE with DEE (187/266, 70%), focal structural epilepsies (146/223, 65%), and self‐limited epilepsy with centr", "score": 0.31526196 }, { "number": 17, "title": "Ethosuximide - StatPearls - NCBI Bookshelf", "detail": "www.ncbi.nlm.nih.gov", "url": "https://www.ncbi.nlm.nih.gov/books/NBK544244", "authors": "www.ncbi.nlm.nih.gov", "host": "www.ncbi.nlm.nih.gov", "snippet": "The International League Against Epilepsy (ILAE) recommends ethosuximide for treating neurodevelopmental delay with generalized epilepsy (NDD with generalized epilepsy). This type of epilepsy is characterized by generalized seizure activity along with neurodevelopmental delays and responds well to m", "score": 0.2370461 }, { "number": 18, "title": "Absence Seizure - StatPearls - NCBI Bookshelf", "detail": "www.ncbi.nlm.nih.gov", "url": "https://www.ncbi.nlm.nih.gov/books/NBK499867", "authors": "www.ncbi.nlm.nih.gov", "host": "www.ncbi.nlm.nih.gov", "snippet": "Absence status consists of generalized, nonconvulsive seizures characterized by impairment of awareness and intermittently has other manifestations such as automatisms or subtle myoclonic, tonic, atonic, or autonomic phenomena. Patients usually have a previous diagnosis of generalized epilepsy. Abse", "score": 0.23443334 }, { "number": 19, "title": "Focal Onset Seizure - StatPearls - NCBI Bookshelf", "detail": "www.ncbi.nlm.nih.gov", "url": "https://www.ncbi.nlm.nih.gov/books/NBK500005", "authors": "www.ncbi.nlm.nih.gov", "host": "www.ncbi.nlm.nih.gov", "snippet": "A seizure is a sign that refers to a transient occurrence of signs and symptoms due to episodic, excessive, and disorderly neuronal activity within the brain. Epilepsy is a brain disorder \"characterized by an enduring predisposition to generate epileptic seizures and by this condition's neurobiologi", "score": 0.22728102 }, { "number": 20, "title": "Eclampsia in the 21st century", "detail": "www.ajog.org", "url": "https://www.ajog.org/article/S0002-9378(20)31128-5/fulltext", "authors": "www.ajog.org", "host": "www.ajog.org", "snippet": "When an alternative diagnosis is considered, the path toward the diagnosis of a seizure in pregnant women will begin with a thorough history and physical examination. Underlying causes, including medications, substance abuse, and medical comorbidities, should be evaluated. Although not routinely rec", "score": 0.41962478 }, { "number": 21, "title": "[PDF] Levetiracetam Versus Valproate in Idiopathic Generalized Tonic ...", "detail": "cdn.clinicaltrials.gov", "url": "https://cdn.clinicaltrials.gov/large-docs/26/NCT03940326/Prot_SAP_000.pdf", "authors": "cdn.clinicaltrials.gov", "host": "cdn.clinicaltrials.gov", "snippet": "(EEG) and seizure symptomatology in favor of GTCS or JME were mandatory. Patients with history of hepatic, renal and hematologic disorders, known psychosis, psychogenic non-epileptic seizure, status epilepticus and illegal drug abuse, patients who had been treated with LEV or VPA in the last 6 month", "score": 0.7334523 }, { "number": 22, "title": "[PDF] Monotherapy with any of the standard antiseizure medications ...", "detail": "cdn.who.int", "url": "https://cdn.who.int/media/docs/default-source/essential-medicines/2023-eml-expert-committee/who-department-comments/a24_levetiracetam_msd.pdf?sfvrsn=f862ca0e_1", "authors": "cdn.who.int", "host": "cdn.who.int", "snippet": "and focal-onset seizures in men/boys and women/girls who are not of childbearing potential. - In women and girls of childbearing potential with generalized onset seizures, lamotrigine or levetiracetam should be offered as first line monotherapy. - In adults with established status epilepticus, i.e. ", "score": 0.6765563 }, { "number": 23, "title": "Epilepsies in children, young people and adults", "detail": "www.nice.org.uk", "url": "https://www.nice.org.uk/guidance/ng217/evidence/10-antiseizure-medications-for-repetitivecluster-seizures-monotherapy-and-addon-therapies-pdf-398366282773", "authors": "www.nice.org.uk", "host": "www.nice.org.uk", "snippet": "Levetiracetam versus phenytoin in management of generalized tonic clonic status epilepticus: a randomized open label study. Annals of Indian Academy of Neurology. 2014; 17(Suppl S2):S206 36. Chamberlain JM, Altieri MA, Futterman C, Young GM, Ochsenschlager DW, Waisman Y. A prospective, randomized st", "score": 0.54971373 }, { "number": 24, "title": "Long-term outcomes of treatment with levetiracetam and valproate in idiopathic generalized epilepsy - ScienceDirect", "detail": "www.sciencedirect.com", "url": "https://www.sciencedirect.com/science/article/abs/pii/S105913112500069X", "authors": "www.sciencedirect.com", "host": "www.sciencedirect.com", "snippet": "Title: Long-term outcomes of treatment with levetiracetam and valproate in idiopathic generalized epilepsy - ScienceDirect\n# Long-term outcomes of treatment with levetiracetam and valproate in idiopathic generalized epilepsy. Valproate has been the preferred treatment for idiopathic generalized epil", "score": 0.60610276 } ], "publishedAt": "2026-08-21T02:35:25.978834+00:00", "updatedAt": "2026-08-21T02:35:25.978834+00:00", "readingMinutes": 7, "slug": "generalized-tonic-clonic-seizure" }