(06-02-08) -seizure disorders - 2015
DESCRIPTION
seizure disordersTRANSCRIPT
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Seizures
An epileptic seizure is a transient occurrence of signs and/or symptoms due to abnormal excessive or synchronous neuronal activity in the brain.
Fischer RS et al., Epileptic Seizures and Epilepsy. Epilepsia, 46(4):470–472, 2005
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Epilepsy
Epilepsy is a disorder of the brain characterized by an enduring predisposition to generate epileptic
seizures and by the neurobiologic, cognitive, psychological, and social consequences of this
condition. Epilepsy is not a singular disease entity but a variety of disorders reflecting underlying brain dysfunction
that may result from many different causes.
Fischer RS et al., Epileptic Seizures and Epilepsy. Epilepsia, 46(4):470–472, 2005
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EpilepsyChronic disorder intermittent expressionno obvious physical signshistory is everything
– correct diagnosis of seizure– classification of seizure– epilepsy syndrome– management, titration of medication
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EpidemiologySeizures; lifetime cumulative risk, of 1 seizure,
5-9% – 1/3 children, febrile seizures– 1/3 patients single seizure – 1/3 epilepsy
Epilepsy; at least 2 seizures, on more than 1 occasion– prevalence, number of cases at a given time– approximately 6 per 1,000, 0.5-1.0%
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Diagnosis of EpilepsyEpilepsy is a disease of the brain defined by
any of the following conditionsAt least two unprovoked (or reflex) seizures
occurring >24 h apartOne 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
Diagnosis of an epilepsy syndrome
Fischer RS et al., A practical clinical definition of Epilepsy. Epilepsia, 55(4):475-485, 2014
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Classification of seizures
International League Against Epilepsy Classification of Epileptic Seizures, 1981– based upon clinical seizure, interictal EEG and
ictal EEGPathophysiology
– Partial seizures– Generalised seizures– Unclassified
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– Display of fluctuations in voltage which occur over the scalp generated by postsynaptic potentials in cortical neurones.
– To record at the scalp, there must be summation of synchronous potentials generated by many synapses.
ElectroencephalographyEEG
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Revision of classification scheme
Epilepsia, 51(4):676–685, 2010
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Generalized seizures
"those in which the first clinical changes indicate initial involvement of both hemispheres"– Tonic-clonic seizures – Absence seizures, "petit mal" – Myoclonic– Tonic seizures– Atonic seizures
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Generalized epileptic seizures are thought to originate within bilaterally distributed networks. These include cortical and subcortical structures, but not necessarily the entire cortex. They can arise from focal lesions.
Ingrid Scheffer with permission, 2013
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200uV
Rhythmical voltage fluctuations as a result of interaction between the cortex and thalamus.
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Rhythmical voltage fluctuations as a result of interaction between the cortex and thalamus.
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Generalised tonic clonic seizure
Convulsion, Grand mal seizure, “fit”Sudden onset no warning for patientMay see myoclonic jerks firstTonic phase with tremor Interupted by brief atonia = clonic phaseUnconscious afterward, confused
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Focal (Partial) seizures
"the first clinical and EEG changes indicate initial activation of a system of neurons limited to part of one cerebral hemisphere" – ? consciousness is preserved or lost during the
seizures. » Simple partial seizures » Complex partial seizure, automatisms are
semipurposeful movements
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Focal epileptic seizures originate within networks limited to one hemisphere. These may be discretely localized or more widely distributed.…
Ingrid Scheffer with permission, 2013
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15 year old girl
Seizures started at age 10 years– abnormal movements of the right arm– followed by weakness
Second daily seizures despite medication trials– carbamazepine, increasing doses– carbamazepine and levetiracetam
Normal motor and sensory function
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•Axial T1 MRI images•post central encephalomalcia
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27 year old male, seizures since 11 yrs
Seizures begin in right frontal lobe– spread to frontal eye field– patient aware of head &
eye deviation to left – then loss of awareness– secondarily generalised
tonic clonic seizure
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Seizure onset
footleg
hand
facetongue
Frontal eye field
Examination of the seizure evolution
Head and eye version
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Key features in Seizures
Focal onset– Aura?– Consciousness lost?– May progress to generalised seizure
Generalised – with in a rapidly engaged network– Non-convulsive, absence– Generalised tonic clonic seizures
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Aetiology of Epilepsy Infancy & childhood
– Birth injury– Inborn error metabolism– Congenital malformn.
Childhood & adolescence– Genetic syndromes– CNS infection
Adolescence & young adult– Head trauma
Older adult– Stroke– Brain tumor
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Proportion of incidence cases of epilepsy by aetiology in Rochester, Minnesota, 1935–1984
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Aetiology of epilepsy25-30% have an identifiable neurological or
systemic disorder» Stroke 12%, head injury 4%, infection 2.5%» brain tumour 3.5-5%, neurodegenerative 2%» birth trauma, developmental malformations of brain
– Age related incidence60-70% will not have an identifiable cause
for the epilepsy– epileptic syndromes can be defined
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Epilepsy syndrome
Classification of the epilepsies and epileptic syndromes, 1989
describes the patient’s illness– history and examination, aetiology– family history– seizure type(s)– electroencephalography– structural neuroimaging
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Mesial temporal sclerosis on MRI scan of the brainComplex partial seizures
loss of awareness, amnesia for events, automatisms
Mesial temporal lobe epilepsy
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Childhood absence epilepsy
peak onset 6-7 years, girls > boys – family history of epilepsy– Absences very frequent
EEG, 3Hz spike and wave complexes, » clinical seizures produced by hyperventilation
remission in approx. 80% by adolescence – generalised tonic clonic seizures, 20-40%– ethosuximide, valproate, lamotrogine
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Juvenile myoclonic epilepsy– age of onset, 12-16 years
» myoclonic seizures, early morning occurrence» generalized (clonic-)tonic-clonic seizures, 90-95%» absence seizures occur in 10-33% of cases
– genetic etiology, » ?chr 6, ?dominant pattern, ?autosomal recessive
– interictal EEG, normal background activities» generalised spike-wave discharges 4-6 Hz» photoparoxysmal responses, 30%
– Prognosis good, with 86-90% responding VPA
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Epilepsy Syndromes
Describe the patients epilepsy– Seizure types, aetiology, prognosis
Many epilepsy syndromes exist without a known aetiology– Idiopathic or Genetic epilepsy– Ion channel disorders
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IdiopathicGeneralized
IdiopathicPartial
Symptomatic Generalized
Symptomatic Partial
1989 Classification
But many patients could not be classified
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The Epilepsies (2014)Generalized Focal
Genetic GeneticStructural StructuralMetabolic MetabolicImmune Immune
Infectious InfectiousUnknown Unknown
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Genetic contribution to epilepsy Relatives of probands with epilepsy > controls
– prevalence studies 4.8% vs 1.9%
Risks are greater for generalised than focal epilepsies
– Generalised epilepsies: risk to sibs ~ 10%
– Focal epilepsies: risk to sibs < 5%
– Febrile seizures: risk to sibs ~ 8%
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Genetic contribution to epilepsy
– Twin studies» “idiopathic” epilepsy syndromes (genetic);
eg. Childhood Absence Epilepsy
» monozygotic 70.2%, dizygotic 7.5%» Structural focal epilepsy (acquired);
eg. Head injury, encephalitis, tumour » monozygotic 10.8%, dizygotic 5.6%
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Epilepsy with Mendelian inheritance
Autosomal dominant– eg. tuberous sclerosis, Familial cavernous angiomas
Autosomal recessive– eg . phenylketonuria, pyridoxine dependency, Lissencephaly
X linked– eg. Subcortical band heterotopia
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Epilepsies with Simple Inheritance Voltage-gated Channelopathies
– Benign Familial Neonatal Seizures; Potassium channel genes– Benign Familial Neonatal-Infantile Seizures; Sodium channel gene– Generalized Epilepsy with Febrile Seizures Plus, Sodium channel
Ligand-gated Channelopathies– Autosomal Dominant Nocturnal Frontal Lobe Epilepsy; Nicotinic
receptor subunit genes– Idiopathic Generalized Epilepsy /GEFS+; GABA receptor subunit
gene– Juvenile myoclonic epilepsy; GABA receptor subunit gene
Non-Channel genes– Autosomal Dominant Partial Epilepsy with Auditory Features;
?Tumour suppressor gene
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Genetic epilepsy syndrome with heterogeneous phenotypes
Common phenotypes– Typical febrile seizures
– Febrile seizures outside 3m to 6yr ± afebrile seizures (FS+)
Less common phenotypes– FS+ and absences, FS+ and myoclonus, FS+ and atonic seizures
– FS+ and focal (esp. temporal) epilepsy
– Myoclonic-astatic epilepsy, Severe myoclonic epilepsy infancyScheffer & Berkovic 1997; Singh et al 1999
Generalised Epilepsy with Febrile Seizures Plus (GEFS+)
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Berkovic and Scheffer, 2003
Majority of Idiopathic Epilepsies have complex inheritance
Simple inheritance
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GA, 56 year old woman
Husband was woken from sleep by his wife having a seizure
He found GA stiff and unresponsive, jerking
She was unconscious when CDA arrivedShe next recalls waking in the hospital, c/o headache and back pain, laceration
lateral margin of tongue
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Questions with a First SeizureSeizure or not?Seizure type?
– focal onset, postictal deficitsEvidence of CNS dysfunction?
– school, work, hemiparesis, PMHAny precipitating factors?What investigations to order?Do we start an AED?What precautions to advise?
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Seizure Precipitants
Low (less often, high) blood glucose
Low sodium, calcium, magnesium
Stimulant/other proconvulsant intoxication
Sedative withdrawal
Severe sleep deprivation
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Evaluation of a First Seizure
History, physicalBlood tests: FBC, electrolytes, glucose, Ca,
Mg, hepatic and renal functionLumbar puncture only if meningitis or
encephalitis suspected (CT scan)Urine drug screenElectroencephalogramCT or MR brain scan
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EEG studies interictal epileptiform abnormalities
– increased risk for seizure occurrence » normal EEG does not exclude epilepsy» presence of an epileptiform abnormality does not
prove epilepsy
– interictal epileptiform, partial or generalized if normal,
» repeat after sleep deprivation» >3 normal, rare to be diagnostically useful
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Seizure recurrence after 1st seizure
wide range from studies, pooled data 51%most recurrences in 1st year, usually 3-6moPredictive factors
– idiopathic (32%) vs remote symptomatic (57%)» abnormal exam, structural lesion on CT/MRI
– abnormal EEG, epileptiform (58%)– partial seizures, especially remote symptomatic
Relapse rate is reduced by AED treatment
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Paroxysmal nonepileptic eventeg. syncope
Acute symptomatic seizureeg. Febrile convulsion
Single seizure
Idiopathic
Temporal Extratemporal
Symptomatic
Partial
Idiopathic Symptomatic
Generalised
Recurrent unprovoked seizures. Epilepsy
Unprovoked seizureIs it the first seizure?
SeizureWas there an intercurrent illness?
Was it provoked?
Paroxysmal clinical eventWas it a seizure?
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Aims of AED treatment
Choose appropriate medication– valproate for generalised seizures
Use a single drug, monotherapy – simplifies treatment, reduces adverse effects
Make the patient seizure free– without dose related side effects
if seizures recur, increase dose– maximal tolerated dose– need to observe for 2-3x usual seizure interval
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Prognosis
70% have a good prognosis for control of seizures and remission– better for idiopathic than symptomatic– better for generalised than partial
20% need regular medication and may have breakthrough seizures
5-10% poorly controlled
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Clinical practice
First Seizures– Are they isolated?– Is this the onset of epilepsy?
Epilepsy– Investigation, aetiology– Treatment with AED– Titrattion against seizures
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Paroxysmal nonepileptic eventeg. syncope
Acute symptomatic seizureeg. Febrile convulsion
Single seizure
Idiopathic
Temporal Extratemporal
Symptomatic
Partial
Idiopathic Symptomatic
Generalised
Recurrent unprovoked seizures. Epilepsy
Unprovoked seizureIs it the first seizure?
SeizureWas there an intercurrent illness?
Was it provoked?
Paroxysmal clinical eventWas it a seizure?
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MR, 16 year old boy
Several witnessed generalised seizures– during the day
about to go on trip to Japan
Would you start medication?Which AED to use?
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Syncope Precipitating factors Light-headed, tinnitus limp fall, convulsive
movements brief rapid recovery no incontinence or
tongue bite Normal EEG
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Seizures
Supine, sleep Aura, CPS tonic clonic evolution duration minutes postictal confusionmuscle soreness, injury,
lateral margin tongue bite Abnormal EEG
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Syncope vs Seizures
Precipitating factors Light-headed, tinnitus limp fall, convulsive
movements brief rapid recovery no incontinence or tongue
bite Normal EEG
Supine, sleep Aura, CPS tonic clonic evolution duration minutes postictal confusionmuscle soreness, injury,
lateral margin tongue bite Abnormal EEG
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Differential diagnosis of seizures
SeizureSyncopeMigraineCerebral ischaemiaMovement disorderSleep disorderMetabolic disturbancePsychiatric disturbance
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Refractory seizure disorder
Review the diagnosis– are the seizures epileptic?
Review the medical therapy– compliance with medication?– adequate trials of AEDs?
Consider alternatives to medical therapy– epilepsy surgery in partial seizure disorders
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Refractory seizure disorder
Review the diagnosis– are the seizures epileptic?
Review the medical therapy– compliance with medication?– adequate trials of AEDs?
Consider alternatives to medical therapy– epilepsy surgery in partial seizure disorders
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Epilepsy surgery
Failure of antiepileptic medication– Trials of different drugs, >2 often predicts
refractory seizures– Identify epileptic focus;
» Video EEG, MRI, PET, SPECT
– show it could be removed safelyTemporal lobectomyFocal cortical resection of frontal, parietal
or occipital lobes
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Epilepsy surgery
Temporal lobectomy– Most common surgery
» 60-70% seizure freedom
Extratemporal surgery– Focal cortical resection of frontal, parietal or
occipital lobes» Seizure freedom 40-60%
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Summary points
Seizures verses EpilepsyClassification of seizures; Partial vs Generalised
seizuresAetiology of epilepsyClassification of the epileptic syndromes
First Seizure; was this a seizures or not?Seizure type?, underlying CNS dysfunction
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Patient;Different?Friends?
Neurologist;Syndrome?Prognosis?
Paediatrician;Epilepsy?Syndrome?Investigations?Treatment?
GP;Referral?
Parent;Seizures?Cause?Prognosis?
School;School camp?Exams?