Classification of Status Epilepticus: A New Proposal Dan Lowenstein, M.D. University of California, San Francisco
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1 Classification of Status Epilepticus: A New Proposal Dan Lowenstein, M.D. University of California, San Francisco for the ILAE Taskforce for Classification of Status Epilepticus: Eugen Trinka, Hannah Cock, Dale Hesdorffer, Andrea O. Rossetti, Ingrid E Scheffer, Shlomo Shinnar, Simon Shorvon
2 1 Commission on Classification ILAE, Epilepsia 1981; 2 Engel et al. Epilepsia 2006; 3 Theodore et al. 1994; 4 Lowenstein et al. 1999; 5: Dobesberger et al. Epilepsy & Behavior 04/2015; DOI: /j.yebeh ; Definition of Status Epilepticus Traditional classification: There were as many types of status as there were types of epileptic seizures (draft 1962; final 1967) SE classification mirrored the seizure classification (1964, final 1970) a seizure that persists for a sufficient length of time or is repeated frequently enough that recovery between attacks does not occur ILAE Majority of GTCS < 2-3 min 3,5 Operational definition: 5min 4 Mechanistically, SE represents the failure of the natural homeostatic seizure-suppressing mechanisms for seizure termination. 2
3 Definition of Non Convulsive Status Epilepticus 1 Commission on Classification ILAE, Epilepsia 1981; 2 Drislane et al. Epilepsy Behav. 2000;1(5):301-14; 3 Trinka Lowenstein et al. Epilepsia 2015 (R1 submitted) Traditional classification: There were as many types of status as there were types of epileptic seizures (draft 1962; final 1967) SE classification mirrored the seizure classification (draft 1964, final 1970) enduring epileptic condition with reduced/altered consciousness, behavioural and vegetative abnormalities or merely subjective symptoms, without major convulsive movements 1 NCSE Definition 30 min NCSE Definition 10 min 3 Mechanistically, SE represents the failure of the natural homeostatic seizure-suppressing mechanisms for seizure termination. 2
4 Definition of Status Epilepticus Status epilepticus is the failure of the mechanisms responsible for seizure termination or the initiation of mechanisms, which lead to abnormally prolonged seizures (t1) that might have long-term consequences (t2), including neuronal death, neuronal injury, and alteration of neuronal networks, depending on the type and duration of seizures Conceptual (= mechanistic ) definition 2 Operational dimensions: length of seizure (t 1 ) time (t 2 ) to long term consequences
5 Type of SE Time (t1), when a seizure is likely to be prolonged leading to continuous seizure activity Time (t2), beyond which long term consequences are increasingly likely (including neunonal injury, neuronal death, alteration of neuronal networks and functional deficits) Tonic clonic SE 5 minutes <30 minutes Focal NCSE with impaired consciousness Absence status epilepticus 10 minutes* minutes* 2 minutes** unknown* Implications to treatment Time point 1 determines the earliest time when treatment should be considered or started Time point 2 determines the time at which status should be controlled to prevent long term consequences * Best available evidence, but insufficient data to give a definite timepoint
6 How long do seizures last in patients with epilepsy? 1 1: Dobesberger and Ristic et al. Epilepsy & Behavior 04/2015; DOI: /j.yebeh
7 How long do seizures last in patients with epilepsy? 1 Mean seizure duration +4 SD 1: Dobesberger and Ristic et al. Epilepsy & Behavior 04/2015; DOI: /j.yebeh
8 How long do seizures last in patients with epilepsy? 1 Cumulative 99% seizure duration of focal complex seizures 1: Dobesberger and Ristic et al. Epilepsy & Behavior 04/2015; DOI: /j.yebeh
9 Classification of SE Axis 1 Semiology Axis 2 EEG Axis 3 Etiology Axis 4 Age Clinical Classification of SE Types Classification of SE
10 Axis 1 = semiology Classification of SE types Along two taxonomic criteria: motor symptoms and impairment of consciousness A) With prominent motor symptoms B) Without prominent motor symptoms (i.e. NCSE)
11 Axis 1 = semiology Classification of SE types Along two taxonomic criteria: motor symptoms and impairment of consciousness A) With prominent motor symptoms 1. Convulsive SE (syn.: tonic clonic SE, CSE) 2. Myoclonic SE (prominent epileptic myoclonic jerks) 3. Focal motor (including EPC) 4. Tonic SE 5. Hyperkinetic SE B) Without prominent motor symptoms (i.e. NCSE) Trinka, Trinka, Lowenstein et et al. al. ILAE ILAE Task Task Force Force on on Classification of of SE, SE, Epilepsia (R1 (R1 submitted)
12 Axis 1 = semiology Classification of SE types Along two taxonomic criteria: motor symptoms and impairment of consciousness A) With prominent motor symptoms 1. Convulsive SE (syn.: tonic clonic SE, CSE) 2. Myoclonic SE (prominent epileptic myoclonic jerks) 3. Focal motor (including EPC) 4. Tonic SE 5. Hyperkinetic SE B) Without prominent motor symptoms (i.e. NCSE) 1. NCSE with coma 2. NCSE without coma a. Generalised b. Focal Trinka, Trinka, Lowenstein et et al. al. ILAE ILAE Task Task Force Force on on Classification of of SE, SE, Epilepsia (R1 (R1 submitted)
13 Axis 1 = semiology Classification of SE types Along two taxonomic criteria: motor symptoms and impairment of consciousness A) With prominent motor symptoms 1. Convulsive SE (syn.: tonic clonic SE, CSE) a) Generalised convulsive b) Focal onset evolving into bilateral convulsive SE c) Unknown whether focal or generalised 2. Myoclonic SE a) With coma b) Without coma 3. Focal motor a) Repeated focal motor seizures (Jacksonian) b) Epilepsia Partialis Continua (EPC) c) Adversive status d) Oculoclonic status e) Ictal paresis 4. Tonic SE 5. Hyperkinetic SE Trinka, Trinka, Lowenstein et et al. al. ILAE ILAE Task Task Force Force on on Classification of of SE, SE, Epilepsia (R1 (R1 submitted)
14 Axis 1 = semiology Classification of SE types Along two taxonomic criteria: motor symptoms and impairment of consciousness B) Without prominent motor symptoms (i.e. NCSE) 1. NCSE with coma 2. NCSE without coma a) Generalised a) Typical absence status b) Atypical absence status c) Myoclonic absence status b) Focal a) Without impaired consciousness (Aura continua) (With autonomic*, sensory symptoms, visual, olfactory, gustatory, emotional, auditory symptoms b) Aphasic SE c) With impaired consciousness (dyscognitive SE) c) Unknown a) Autonomic SE* Trinka, Trinka, Lowenstein et et al. al. ILAE ILAE Task Task Force Force on on Classification of of SE, SE, Epilepsia (R1 (R1 submitted)
15 Axis 1 = semiology Classification of SE types Along two taxonomic criteria: motor symptoms and impairment of consciousness Currently indeterminate conditions** 1. Epileptic encephalopathies 2. Coma with epileptiform EEG patterns 3. Behavioural disturbance (e.g psychosis) in patients with epilepsy 4. Acute confusional states (e.g delirium) with epileptiform EEG patterns **= Boundary syndromes Trinka, Trinka, Lowenstein et et al. al. ILAE ILAE Task Task Force Force on on Classification of of SE, SE, Epilepsia (R1 (R1 submitted)
16 Classification of SE Axis 1 Semiology Axis 2 EEG Axis 3 Etiology Axis 4 Age Ictal EEG correlates Classification of SE
17
18 Proposed EEG Criteria for NCSE For patients without epileptic encephalopathies: EDs > 2.5 Hz, or EDs 2.5 Hz or rhythmic delta/theta activity (>0.5 Hz) AND one of the following: EEG and clinical improvement after IV AED*, or Subtle clinical ictal phenomena, or Typical spatiotemporal evolution** *If EEG improvement without clinical improvement, or if fluctuation without definite evolution, this should be considered possible NCSE. **Incrementing onset (increase in voltage and change in frequency), or evolution in pattern (change in frequency >1 Hz or change in location), or decrementing termination (voltage or frequency). Beniczky et al. Epilepsia. 2013;54 Suppl 6:28-9.
19 Proposed EEG Criteria for NCSE For patients without epileptic encephalopathies: Increase in prominence or frequency when compared to baseline with observable change in clinical state Improvement of clinical and EEG* features with IV AEDs *If EEG improvement without clinical improvement, or if fluctuation without definite evolution, this should be considered possible NCSE. Beniczky et al. Epilepsia. 2013;54 Suppl 6:28-9.
20 clinical suspicion of NCSE (without preexisting epileptic encephalopathy) EEG data clinical data frequency of epileptiform discharges > 2.5 Hz (1) (2a) typical ictal spatiotemporal evolution ED RA >0.5Hz (2b) (3a) subtle ictal clinical phenomena ED RA >0.5Hz (3b) 4a) EDs 2.5Hz with fluctuation, or 4b) RA >0.5 Hz with fluctuation, or 4c) RA >0.5 Hz wihtout fluctuation careful consideration of clinical situation appropriate AED treatment document improvement* - transition from praemorbid to current ill state within minutes to hours - patient did not improve significantly in last minutes to hours, apart from waxing and waning - no information from brain imaging sufficiently explaining EEG-pattern (e.g. brain stem haemorrhage) - no metabolic/ toxicological derangement sufficiently explaining EEG-pattern (e.g. acute renal or liver failure) EEG clin. EEG + clin. EEG clin. + EEG + clin. + ED...epileptiform discharge RA...rhythmic activity clin....clinical IV AED...intravenous antiepileptic drug NCSE...non-convulsive status epilepticus *important note regarding improvement to IV AED: for clinical practice: all four constellations qualify for NCSE. for research projects: patient qualifies for NCSE if EEG and/or clinical improvement EEG data AND clinical data appropriate NCSE Trinka and Leitinger; Epilepsy and Behavior 2015 (in press)
21 Typical spatiotemporal evolution EEG Incrementing onset: Evolution in pattern: Decrementing termination Voltage Frequency Change in frequency > 1 Hz Change in location Voltage Frequency Typical spatiotemporal evolution* *In order to qualify as present, a single frequency or location must persist at least 3 cycles, and at least two consecutive changes in the same direction has to be present in order to qualify as evolution. If changes are present but do not qualify as evolution, it is considered to be fluctuation, and it is scored as possible NCSE. 1: Leitinger et al. Epilepsy and Behavior 2015 (in press)
22 Classification of SE Axis 1 Semiology Axis 2 EEG Axis 3 Etiology Axis 4 Age Categories of etiology Classification of SE
23 Classification of SE: Axis 3 Etiology 1. Known (syn. symptomatic) a) Acute (e.g.: stroke, intoxication, malaria, encephalitis, etc.) b) Remote (e.g. posttraumatic, postencephalitic, poststroke, etc.) c) Progressive (e.g. glioblastoma, Lafora s disease and other PMEs) d) SE in defined electroclinical syndromes 2. Unknown (syn. cryptogenic) 1 1: Synonymous translations germ.: ungeklärt; french: xxx, span.: yyy; ital.: zzz, russ.: aaa...)
24 Classification of SE: Axis 3 Etiology 1. Known (syn. symptomatic) a) Acute (e.g.: stroke, intoxication, malaria, encephalitis, etc.) b) Remote (e.g. posttraumatic, postencephalitic, poststroke, etc.) c) Progressive (e.g. glioblastoma, Lafora s disease and other PMEs) d) SE in defined electroclinical syndromes 2. Unknown (syn. cryptogenic) 1 1: Synonymous translations germ.: ungeklärt; french: xxx, span.: yyy; ital.: zzz, russ.: aaa...)
25 Classification of SE Axis 1 Semiology Axis 2 EEG Axis 3 Etiology Axis 4 Age Age groups Classification of SE
26 Age Related Disorders and Electroclinical Syndromes with SE 1. SE occurring in the neonatal and infantile epilepsy syndromes a) Tonic Status in Ohtahara Syndrome b) Myoclonic status in Dravet s syndrome c) Febrile SE i. With bilateral motor symptoms ii. With unilateral motor symptoms 2. SE occurring predominately in childhood and adolescence a) NCSE in Early-onset Childhood Occipital Epilepsy (Panayiotopoulos syndrome) b) NCSE in childhood epileptic encephalopathies (e.g., myoclonic-astatic epilepsy, Ring chromosome 20, Angelman syndrome see appendix) c) Tonic status in Lennox Gastaut Syndrome d) Myoclonic Status in Down Syndrome e) Absence Status in Juvenile Absence Epilepsy f) Myoclonic Status in Juvenile Myoclonic Epilepsy g) Myoclonic Status in Progressive Myoclonus Epilepsies h) FIRES 3. SE occurring only in adults and elderly a) De Novo (or relapsing) absence status of later life
27 www. Status-epilepticus.net Online audit of the treatments being used in status epilepticus around the world and their outcome Short and easy to complete Questionnaires!! PLEASE REGISTER AND TAKE PART!!
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