Starting and continuing
treatment in epilepsy
Dr Sankalp Mohan
Resident ,Neurology
Epilepsy in India
• About 10 million people with epilepsy
(prevalence of about 1%);
• One fifth of Global figures
• 70-80 ...
DEFINING EPILEPSY
• Epilepsy is a chronic disorder characterized by
recurrent unprovoked seizures
• An epileptic seizure r...
CLASSIFICATION
• ILAE classification of epilepsies
• 1. Localization-related epilepsies are characterized
by seizures that...
DIAGNOSIS OF EPILEPSY
•
•
•
•

Detailed History and examination
Clues on Clinical ExaminationPresence of an aura
bilateral...
ILAE CLASSIFICATION OF SIEZURE
SYNCOPE VS SIEZURE
SIEZURE AND PSEUDOSIEZURE
INVESTIGATIONS FOR FIRST SIEZURE
• Baseline blood counts, liver enzymes and renal
functions, serum electrolytes ,-Metaboli...
EEG
• An EEG should be performed only to support a
diagnosis of epilepsy in children and young
people
• Normal variants . ...
3 Hz spike and wave – absence
siezures
Generalised polyspike - JME

2 hz spike and wave –
Lennox Gestaut syndrome
VIDEO EEG
• Long term Video EEG is time consuming
• Short term video EEG to distinguish from
psychogenic
• Done for 24 hrs...
Neuroimaging Studies
•
•
•
•

Neuroimaging in epilepsy is useful in:
• Focal seizures
• Seizures suspected to be symptomat...
• Advanced epilepsy protocols and newer imaging
modalities [functional magnetic resonance
imaging (fMRI), single photon em...
Invsestigations in suspected siezure
TREATMENT OF EPILEPSY
• Treatment should be initiated following the
occurrence of two or more unprovoked seizures
• Risk o...
WHEN TO TREAT FIRST SIEZURE ?
AED treatment may occasionally be deferred
• Infrequent seizures with extremely long / several
years interval
• Rolandic e...
Principles of AED treatment
• Treatment should be started with a single
conventional antiepileptic drug-monotherapy
• Star...
CHOICE OF ANTIEPILEPTIC DRUG
• Preferable to use a conventional AED Phenytoin
(PHT), Phenobarbitone (PB), Carbamazepine
(C...
Partial siezures
• Carbemzepine is more effective for complex partial
siezures
Disadvantages – potent enzyme
inducer,autoi...
GENERALISED SIEZURES
• Valproate is the AED of choice
• Phenytoin .CBZ and oxcarbazepine may be
considered
• Newer AED – T...
SUBSTITUTION MONOTHERAPY
• Choice of substitution depends on reason for
failure of orignal AED (ADR or lack of response)
•...
ADJUNCTIVE THERAPY
DEPENDS ON
• Pharmacokinetic interactions –eg enzyme
inducer with hepatically metabolized drug
• Newer ...
Newer drugs
- All newer drugs FDA approved for adjunctive
therapy for partial siezures
- Lamotrigine,Topiramate and Levite...
NEWER ANTIEPILEPTICS
• People who have not benefited from treatment
with the conventional AED
• contraindications to the f...
Specific syndromes
• Benign Rolandic Epilepsy – Treament may not
be necessary . Valproate or Carbamzepine
• Lennox Gestaut...
COMMONLY USED DRUGS
Adverse reactions
• A.) Acute CNS ADR –
- somonolence ,dizziness ,ataxia ,vertigo,cognitive
dysfunction .
- depends on Hig...
C) IDIOSYNCRATIC REACTIONS –
• -RASH – Highest with Phenytoin -10% ,CBZ8.7%, LTG -6.2%
• -serious idiosyncratic reactions ...
• HEPATOTOXICITY• - Acute hepatitis occurs usually within first 3
months
• Coexisting liver disease ,other enzyme inducing...
• Hematotoxicity
• -Macrocytic Anemia – PHT,CBZ,PHB ,VPA
• Aplastic Anemia – CBZ .5-20 cases per million
• Agranulocytosis...
• Valproate induce pancreatitis – infrequent
• Poor corelation with amylase.Lipase more
helpful
• Changes in Body weightCl...
Teratogenicity
• Major or minor malformations
• Fetal anticonvulsant syndrome – many drugs share
same effects
• Prenatal e...
• Prenatal exposure to AED cognitive slowing in
children
• Phenytoin associated with
lymphoma./pseudolymphoma
Drug interactions
• (PHT, PB, CBZ and OXC ) induce hepatic
enzymes and enhance the metabolism of lipid
soluble drugs. Redu...
Frequency of follow-up
• maintain a seizure diary-prescribed medication
is taken as advised and to detect any adverse
effe...
Role of AED level monitoring
• Routine monitoring of AED blood levels is not
recommended
Indications
• Non-compliance
• Su...
Failure of initial treatment
• Ascertain the accuracy of the diagnosis of
epilepsy
• The appropriateness of the drug for t...
STATUS EPILEPTICUS
• CONVULSIVE status epilepticus –
continous convulsive siezures lasting %min or
more in which the patie...
TREATMENT OF STATUS EPILEPTICUS
Treament of Refractory status
epilepticus
Withdrawal of AEDs
• seizure-free period of two to three years.
• Avoided in certain epilepsy syndromes (e.g.,juvenile
myo...
Women with Epilepsy
• (WWE) who continue appropriate AEDs under
proper supervision have more than 90% chance of
having a n...
• The risk of major fetal malformations is
approximately 5% more
• risk is further reduced when the mother is using
monoth...
Siezures in pregnancy
• Seizures may remain unchanged in 50% WWE or
improve (25%) or even worsen (25%) during
pregnancy.
•...
Recommendations
• All WWE should be given two doses of vitamin K 10 mg intramuscularly
(IM) at 34 and 36 weeks of pregnanc...
Epilepsy in Children and Neonates
• Subtle manifestations of seizures are common in
neonates and infants and these must be...
West Syndrome and Infantile Spasms
• corticotropin or corticosteroids should be used
as first-line treatment.
• benzodiaze...
EPILEPSY IN ADOLESCENTS
•
•
•
•

Avoiding sleep deprivation,
alcohol and substance abuse,
driving,
potentially risky leisu...
COMORBID CONDITIONS
• CARDIAC DISEASE – iv Phenytoin can cause
arrythmias , Hypotension
• In patients with cardiac disease...
• LIVER DISEASE – Hepatic metabolism of
drugs may be altered
• - Phenobarbitone ,benzodiazepines can
precipitate Hepatic E...
EPILEPSY IN ELDERLY
• Generalized tonic-clonic seizures dominate for metabolic
or toxic etiologies
• Every elderly patient...
MEDICALLY INTRACTABLE EPILEPSY
• Those in whom epilepsy is not controlled by two or more
appropriate AEDs used in their op...
• 30 -40 % SIEZURES persist despite multiple
AED
• Rule out erroneous diagnosis, non compliance
• Partial/localization rel...
SURGERY IN EPILEPSY
• GOOD SURGICAL CANDIDATE • Epileptogenic Area is Clearly Defined ,Amenable
to Rescetion with minimal ...
• Continuous video EEG- ictal and interictal
record with discontinuation of drug
• 75 % cases Localisation with Scalp Reco...
• Resective surgery includes
• lesionectomy (resection of the lesion and the
surrounding epileptogenic area),
• amygdalohi...
VAGAL NERVE STIMULATION
• Those who are not surgical candidates
• Pacemaker device implanted subcutaneously in
left infrac...
Thank you
References
• Indian Epilepsy Associationguidelines for the management of epilepsy in
India (GEMIND). -2008
- International...
starting and continuing treatment in epilepsy
starting and continuing treatment in epilepsy
starting and continuing treatment in epilepsy
starting and continuing treatment in epilepsy
starting and continuing treatment in epilepsy
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Dr Sankalp Mohan
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starting and continuing treatment in epilepsy

  1. 1. Starting and continuing treatment in epilepsy Dr Sankalp Mohan Resident ,Neurology
  2. 2. Epilepsy in India • About 10 million people with epilepsy (prevalence of about 1%); • One fifth of Global figures • 70-80 % can lead normal lives • Still 50-70% are receiving No treatment or inadequate treatment
  3. 3. DEFINING EPILEPSY • Epilepsy is a chronic disorder characterized by recurrent unprovoked seizures • An epileptic seizure refers to transient occurrence of signs and/or symptoms due to abnormally excessive or synchronous neuronal activity in the brain may be characterized by sensory, motor or autonomic phenomena with or without loss of consciousness. • Seizures occurring in a setting of an acute illness or medical condition like high fever, hypoglycemia, etc. are classified as acute symptomatic seizures.
  4. 4. CLASSIFICATION • ILAE classification of epilepsies • 1. Localization-related epilepsies are characterized by seizures that have a focal or partial and generalized epilepsies are characterized by generalized onset of seizures. • 2. Idiopathic epilepsies are those that are inherited or occur without identifiable pathologic cause. Symptomatic epilepsies are those associated with a known or suspected brain disease or lesion. • 3. Epilepsy syndromes are age specific and may begin during infancy, childhood or adolescence
  5. 5. DIAGNOSIS OF EPILEPSY • • • • Detailed History and examination Clues on Clinical ExaminationPresence of an aura bilateral tonic clonic movements, sudden jerking, deviation of eyes and head, alteration or loss of consciousness, and may be associated with injuries, tongue bite or incontinence • Postictally the patient may have confusion, drowsiness, headache or weakness.
  6. 6. ILAE CLASSIFICATION OF SIEZURE
  7. 7. SYNCOPE VS SIEZURE
  8. 8. SIEZURE AND PSEUDOSIEZURE
  9. 9. INVESTIGATIONS FOR FIRST SIEZURE • Baseline blood counts, liver enzymes and renal functions, serum electrolytes ,-Metabolic screen Serum Calcium If diagnosis of siezure in doubt - Serum Prolactin – within 10 -20 minutes of the event .sensitivity for GTC -60 %. CPS -46 % - Can be false positive in syncope - Serum Creatine kinase- elevated for hours
  10. 10. EEG • An EEG should be performed only to support a diagnosis of epilepsy in children and young people • Normal variants . False positive in syncope • Within 24 hrs of siezure • Predicts recurrence • Nature ,Type of Epilepsy, epilepsy syndrome • sensitivity – variable ,specificity -99 %
  11. 11. 3 Hz spike and wave – absence siezures
  12. 12. Generalised polyspike - JME 2 hz spike and wave – Lennox Gestaut syndrome
  13. 13. VIDEO EEG • Long term Video EEG is time consuming • Short term video EEG to distinguish from psychogenic • Done for 24 hrs with documentation of 3 or more events • Carried in centres with expertise
  14. 14. Neuroimaging Studies • • • • Neuroimaging in epilepsy is useful in: • Focal seizures • Seizures suspected to be symptomatic in origin • Difficult to control seizures (MRI using special epilepsy protocol). • Computed tomography scan should be the initial investigation in epilepsy patients in India
  15. 15. • Advanced epilepsy protocols and newer imaging modalities [functional magnetic resonance imaging (fMRI), single photon emission CT (SPECT), positron emission tomography (PET)
  16. 16. Invsestigations in suspected siezure
  17. 17. TREATMENT OF EPILEPSY • Treatment should be initiated following the occurrence of two or more unprovoked seizures • Risk of developing a second seizure following a single unprovoked seizure is about 35- 40% • Therapy started only after diagnosis of epilepsy is confirmed. • Treament after first siezure reduces recurrence by 50 %..15 % discontinue due to ADR
  18. 18. WHEN TO TREAT FIRST SIEZURE ?
  19. 19. AED treatment may occasionally be deferred • Infrequent seizures with extremely long / several years interval • Rolandic epilepsy in children
  20. 20. Principles of AED treatment • Treatment should be started with a single conventional antiepileptic drug-monotherapy • Start with a low dose and gradually increase the dose • If ineffective or poorly tolerated, then monotherapy using another AED , first drug slowly tapered • Combination therapy -considered when two attempts at monotherapy with AEDs have not resulted in seizure freedom.
  21. 21. CHOICE OF ANTIEPILEPTIC DRUG • Preferable to use a conventional AED Phenytoin (PHT), Phenobarbitone (PB), Carbamazepine (CBZ), Oxcarbazepine (OXC) • partial seizures -CBZ, OXC, PHT, VPA • GTC S - VPA, PHT,PB, CBZ, OXC • Absence seizures –VPA • myoclonic jerks- VPA and benzodiazepines
  22. 22. Partial siezures • Carbemzepine is more effective for complex partial siezures Disadvantages – potent enzyme inducer,autoinduction –accelerates own metabloism - Newer AED Topiramate and oxcarbezepine –FDA approved as monotherapy oxcarbezepine – weaker enzyme induction, no autoinduction ,more likely to cause hyponatremia
  23. 23. GENERALISED SIEZURES • Valproate is the AED of choice • Phenytoin .CBZ and oxcarbazepine may be considered • Newer AED – Topiramate is the only FDA approved for GTC s Lamotrigine and leviteracetam for adjunctive therapy
  24. 24. SUBSTITUTION MONOTHERAPY • Choice of substitution depends on reason for failure of orignal AED (ADR or lack of response) • Usually a period of adjunctive therapy . • Any AED can be considered .
  25. 25. ADJUNCTIVE THERAPY DEPENDS ON • Pharmacokinetic interactions –eg enzyme inducer with hepatically metabolized drug • Newer drugs advantageous –less interactions eg Gabapentin,Leviteractam,Pregabalin • ADR – sodium channel blockers similar ADR • Different mechanism of actions • Synergistic effects – Valproate and Lamotrigine,
  26. 26. Newer drugs - All newer drugs FDA approved for adjunctive therapy for partial siezures - Lamotrigine,Topiramate and Leviteracteam – adjunctive for GTC s - Leviteracetam FDA approved for adjunctive therapy in Myoclonic siezures .(lamotrigine,Topiramate and zonisamide may be considered) - No FDA approved newer drugs for adjunctive therapy in absence siezures
  27. 27. NEWER ANTIEPILEPTICS • People who have not benefited from treatment with the conventional AED • contraindications to the first line drugs • If The first line drugs interact with other drugs
  28. 28. Specific syndromes • Benign Rolandic Epilepsy – Treament may not be necessary . Valproate or Carbamzepine • Lennox Gestaut syndrome –difficult to control multiple siezure types . Valproate ,Clonazepam - FDA approved.Lamotrigine ,topiramate used - Juvenile Myoclonic Epilepsy – Myoclonic,90% GTC s ,30% absence ..Valproate –DOC .Leviteracetam –Adjunctive therapy
  29. 29. COMMONLY USED DRUGS
  30. 30. Adverse reactions • A.) Acute CNS ADR – - somonolence ,dizziness ,ataxia ,vertigo,cognitive dysfunction . - depends on High initial dose ,rapid escaltion - phenytoin,CBZ (peak dose dependent) - cognitive dysfunction- Barbiturates ,BZD ,Topiramate - Hyponatremia ,water intoxication –OXC ,CBZ B) Acute CVS – Arrythmias ,hypotension – CBZ,PHT
  31. 31. C) IDIOSYNCRATIC REACTIONS – • -RASH – Highest with Phenytoin -10% ,CBZ8.7%, LTG -6.2% • -serious idiosyncratic reactions – SJS ,TEN • Discontinuation of drug always recommended ,switch to BZD ,LEV – low rash potentialid avoid switching if cross reacitvity
  32. 32. • HEPATOTOXICITY• - Acute hepatitis occurs usually within first 3 months • Coexisting liver disease ,other enzyme inducing drugs • Fulminant liver failure can occur • ALT,AST poor predictors • Felbamate ,Lamotrigine
  33. 33. • Hematotoxicity • -Macrocytic Anemia – PHT,CBZ,PHB ,VPA • Aplastic Anemia – CBZ .5-20 cases per million • Agranulocytosis – CBZ,PHT • Mild decrease in leucocyte count – CBZ • Mild decrease in platelet count –VPA . -Psychiatric- Vigabatrin ,Topiramate, Leviteracetam - Paradoxical Aggravation of Siezures-Typical Absence ,Myoclnic aggravated by PHT,OXC,VGB - CBZ cause myoclonus ,Absence status
  34. 34. • Valproate induce pancreatitis – infrequent • Poor corelation with amylase.Lipase more helpful • Changes in Body weightClinically significant weight gain – 62% seen with valproate - BONE HEALTH- Higher risk of Fractures ,Osteoporosis .-PHT,CBZ Barbituartes .Enzyme inducing drugs
  35. 35. Teratogenicity • Major or minor malformations • Fetal anticonvulsant syndrome – many drugs share same effects • Prenatal exposure is associated with 9% risk of major malformation (2-4 % in normal population) • Number of AED used ,First trimester • Valproate – maximum chance • Risk lower for CBZ,lamotrigine • Substitute VPA for lamotrigine • Newer drugs not extensively studied
  36. 36. • Prenatal exposure to AED cognitive slowing in children • Phenytoin associated with lymphoma./pseudolymphoma
  37. 37. Drug interactions • (PHT, PB, CBZ and OXC ) induce hepatic enzymes and enhance the metabolism of lipid soluble drugs. Reduced efficacy of drugs like oral contraceptives and oral anticoagulants. • VPA inhibits hepatic enzymes . slows down the metabolism of concomitant AEDs causing toxicity • Anti-tubercular drugs (like isoniazid and rifampicin are enzyme inducers and also hepatotoxic)
  38. 38. Frequency of follow-up • maintain a seizure diary-prescribed medication is taken as advised and to detect any adverse effects of AED. • The first follow-up -within 2-4 weeks of initiation of treatment • Subsequent follow-ups at every 3-6 months,
  39. 39. Role of AED level monitoring • Routine monitoring of AED blood levels is not recommended Indications • Non-compliance • Suspected toxicity. • Adjustment of AED dose while managing drug interactions • Specific clinical conditions-status epilepticus, liver or renal disease and pregnancy
  40. 40. Failure of initial treatment • Ascertain the accuracy of the diagnosis of epilepsy • The appropriateness of the drug for the particular seizure type, • the adequacy of dosage • compliance of the individual • should be encouraged to make a record seizure on a cell phone camera.
  41. 41. STATUS EPILEPTICUS • CONVULSIVE status epilepticus – continous convulsive siezures lasting %min or more in which the patient doesn t return to baseline consiousness • Non convulsive stutus Epilepticus – Change in Mental status for at least 30 minutes associated with ictal discharges on EEG • Refractory status Epilepticus –Siezure activity that continues after 1st and 2nd line drugs have failed
  42. 42. TREATMENT OF STATUS EPILEPTICUS
  43. 43. Treament of Refractory status epilepticus
  44. 44. Withdrawal of AEDs • seizure-free period of two to three years. • Avoided in certain epilepsy syndromes (e.g.,juvenile myoclonic epilepsy) because of the higher risk of seizure relapse • withdrawn gradually over several months (at least 36 months or longer). • Withdraw one drug at a time in those patients who are on multiple AEDs • The tapering may be performed at a slower rate for benzodiazepines (6 months or longer). • If seizure recurs during withdrawal person may be advised to revert to their AED dose
  45. 45. Women with Epilepsy • (WWE) who continue appropriate AEDs under proper supervision have more than 90% chance of having a normal pregnancy and children. • All WWE should be advised to plan their pregnancies. • cautioned that some AEDs may make OCPs ineffective • All WWE in the reproductive age group should be started on folic acid (5 mg/day) at the time of starting AED
  46. 46. • The risk of major fetal malformations is approximately 5% more • risk is further reduced when the mother is using monotherapy (a single AED) • VPA at higher doses carries higher risk for neural tube defects
  47. 47. Siezures in pregnancy • Seizures may remain unchanged in 50% WWE or improve (25%) or even worsen (25%) during pregnancy. • Antiepileptic drugs should be continued in pregnancy. • All pregnant WWE should be advised screening for fetal malformations by serum alpha fetoprotein at 16 weeks and by detailed ultrasound scanning by an experienced ultrasonologist at 18 weeks.
  48. 48. Recommendations • All WWE should be given two doses of vitamin K 10 mg intramuscularly (IM) at 34 and 36 weeks of pregnancy, unless there is a contraindication for the same. • All infants born to mothers taking AEDs should be given vitamin K 1 mg IM at birth. • If preterm labor is threatened in women taking enzyme-inducing AEDs, 48 mg betamethasone (double the normal dose) should be given over 48 hours. • Seizures during labor should be terminated as soon as possible using intravenous (IV) lorazepam (4 mg IV) or diazepam • All WWE should be encouraged to breast-feed their babies
  49. 49. Epilepsy in Children and Neonates • Subtle manifestations of seizures are common in neonates and infants and these must be looked for very carefully • Febrile Seizures • during fever between 6 months and 5 years of age in the absence of intracranial infection • Single FS occur in 3–5% children
  50. 50. West Syndrome and Infantile Spasms • corticotropin or corticosteroids should be used as first-line treatment. • benzodiazepines, VPA, vigabatrin and topiramate are used as second choice
  51. 51. EPILEPSY IN ADOLESCENTS • • • • Avoiding sleep deprivation, alcohol and substance abuse, driving, potentially risky leisure activities like rock climbing, horse riding, • prolonged television (TV) viewing, playing video games and • dancing in dark rooms with flickering/flashing lights (discotheques).
  52. 52. COMORBID CONDITIONS • CARDIAC DISEASE – iv Phenytoin can cause arrythmias , Hypotension • In patients with cardiac disease infusion rate <10 mg/min. • Iv Valproate is safe, Leviteracetam may be safe • Chronic treatment –CBZ,OXC,PHT should be avoided in AV conduction defects • Respiratory disease – iv benzodiazepines ,iv Phenytoin can cause respiratory depression • Respiratory rate ,HR to be monitored • Valproate .Leviteractam safer
  53. 53. • LIVER DISEASE – Hepatic metabolism of drugs may be altered • - Phenobarbitone ,benzodiazepines can precipitate Hepatic Encephalopathy • Valproate C/I due to hepatotoxicity • Phenytoin highly protein bound hypoalbuminemia – toxicity • Leviteracetam,oxcarbazepine,topiramate • Renal disease- Drugs eliminated by kidneys require dose reduction .LEV,LTG,OXC,PB,TPM
  54. 54. EPILEPSY IN ELDERLY • Generalized tonic-clonic seizures dominate for metabolic or toxic etiologies • Every elderly patient with epilepsy should undergo, at least a CT scan, though MRI is preferable as symptomatic epilepsy is common in elderly • nonconvulsive status epilepticus (NCSE) • The choice of AEDs in elderly depends on many factors: changes in liver, kidney, gastrointestinal (GI) system • Bioavailability of the drug in elderly is altered
  55. 55. MEDICALLY INTRACTABLE EPILEPSY • Those in whom epilepsy is not controlled by two or more appropriate AEDs used in their optimal dosage • Adults (16 years or above) who continue to have seizures even after 2 years of treatment. • Pediatric epilepsy patients can be labeled as MIE much earlier (sometime even within weeks of onset of seizures), if they present with epileptic encephalopathy, infantile spasms, catastrophic onset of epilepsy, seizure frequency of more than one per month
  56. 56. • 30 -40 % SIEZURES persist despite multiple AED • Rule out erroneous diagnosis, non compliance • Partial/localization related epilepsy(30 -70 % cure ), MTS (20 -50 % cure), secondary genralised epilepsy ,Lennox gestaut syndrome
  57. 57. SURGERY IN EPILEPSY • GOOD SURGICAL CANDIDATE • Epileptogenic Area is Clearly Defined ,Amenable to Rescetion with minimal morbidity • Presurgical Evaluation – • High Resolution MRI- Thin Cuts Along Temporal Lobes – For detection of MTS • Structural Lesion correspomding to Epileptogenic Zone
  58. 58. • Continuous video EEG- ictal and interictal record with discontinuation of drug • 75 % cases Localisation with Scalp Recordings • Functional Neuroimaging• Ictal or Interictal SPECT- Radioactive isotope – Technitium 99 – siezure area has highest Perfusion • FDG –PET – interictally done to indentify decreased metabolism
  59. 59. • Resective surgery includes • lesionectomy (resection of the lesion and the surrounding epileptogenic area), • amygdalohippocampectomy with or without temporal lobe resection • Anterotemporal Lobectomy • Nonresective surgery includes multiple subpial transections corpus colostomy and vagus nerve stimulation (VNS
  60. 60. VAGAL NERVE STIMULATION • Those who are not surgical candidates • Pacemaker device implanted subcutaneously in left infraclavicular region • Efficacy is less in partial epilepsy ..10% of patients benefit • Better response in lennox gestaut syndrome
  61. 61. Thank you
  62. 62. References • Indian Epilepsy Associationguidelines for the management of epilepsy in India (GEMIND). -2008 - International League against Epilepsy(ILAE) – Guidleines 2006 - NICE GUIDELINES - Seminars in neurology –july 2008 - European journal of epilepsy -review
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