Clinical severity of seizures Hot Topics Symposium December 10, 2013
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1 Clinical severity of seizures Hot Topics Symposium December 10, 2013 R. Edward Hogan, M.D. Associate Professor Washington University in St. Louis Director, Comprehensive Epilepsy Center at Barnes-Jewish Hospital American Epilepsy Society Annual Meeting
2 Disclosure Name of Commercial Interest Eisai Pharmaceuticals Upsher-Smith Pharmaceuticals Type of Financial Relationship Institutional sponsorship of clinical trials Institutional sponsorship of clinical trials Consultant American Epilepsy Society 2013 Annual Meeting
3 Learning Objectives Understand concepts of seizure severity and their relationship to medication treatment, and diagnostic tests such as EEG and MRI American Epilepsy Society 2013 Annual Meeting
4 Overview Severity of epileptic seizures vary widely between individuals Current clinical diagnostic tools are limited in measuring and predicting seizure severity EEG MRI Improved definition of seizure severity and progression will provide a framework for staging of seizures
5 III NINDS Benchmarks for Epilepsy Research Improve treatment options for controlling seizures and epilepsyrelated conditions without side effects. A. Understand the initiation, propagation, and termination of seizures at the network level in different forms of epilepsy. B. Identify biomarkers for assessing or predicting treatment response, including markers that may identify specific populations that are likely to have good outcomes or develop adverse responses. C. Develop or refine models that are aligned with etiologies and clinical features of human epilepsies, especially treatment resistant forms, to enable improved understanding of ictogenesis and preclinical development to improve seizure control with fewer side effects. Establish the sensitivity and specificity of these models with regard to current therapies. D. Identify, develop, and improve interventions to detect, predict, prevent, or terminate seizures, including approaches suitable for use in the home and other non-medical settings. E. Identify, develop, and improve anti-seizure therapies that target (either alone, or in combination) novel or multiple seizure mechanisms. F. Develop, improve, and implement interventions for effective self-management, including treatment adherence. G. Develop and validate objective patient-centered outcome metrics for clinical studies.
6 Case 1 18 year old woman with a history of a single episode of loss of consciousness, preceded by an unusual epigastric sensation, progressing to a secondarily generalized tonic-clonic seizure She presented on a dose of levetiracetam 250 mg twice daily She reported intolerable side effects (lethargy) to levetiracetam at higher doses.
7 Case 1 Evaluation: EEG showed right temporal epileptiform discharges MRI was normal After 6 months of AED therapy on levetiracetam 250 mg twice daily, she had a repeat seizure 3 days after abrupt selfdiscontinuation of her medication After restarting levetiracetam 250 mg twice daily, she has remained seizure free for one year.
8 Case 2 Development of complex partial epileptic seizures after an episode of encephalitis at age 7 Treatment with multiple AEDs, left anterior temporal lobectomy, and vagal nerve stimulator Typical seizures with onset of a feeling of nausea and lightheadedness followed by loss of consciousness continue on a weekly basis at age 67
9 Epileptic seizure severity Both patients presented with complex partial seizures, due to temporal lobe epilepsy The severity of seizures differed markedly between the two cases What are the factors responsible for the differences between the subjects?
10 Concepts of seizure severity Theodore WH, Porter RJ. Epilepsy: 100 Elementary Principles. 3 ed. London: W.B. Saunders Co. Ltd.; p
11 Therapeutic antiepileptic drug levels 84 patients followed prospectively, on monotherapy phenytoin, phenobarbital, and carbamazepine All studied patients were seizure free for one year AED levels were recorded after patients had their last seizure and following control for one year Medications increased until clinical toxicity if necessary Schmidt D, Haenel F. Therapeutic plasma levels of phenytoin, phenobarbital, and carbamazepine: Individual variation in relation to seizure frequency and type. Neurology, 1984;34:
12 AED levels required for complete seizure cessation (Schmidt D, Haenel F, 1984)
13 Therapeutic antiepileptic drug levels Comparison of clinical features of patients with levels in the upper range. Patients with greater seizure frequency before treatment required higher levels for control. Taking therapeutic range of PHT of 10-20, 21% of pts. controlled with low levels, 30% of patients controlled with high levels. Schmidt D, Haenel F. Therapeutic plasma levels of phenytoin, phenobarbital, and carbamazepine: Individual variation in relation to seizure frequency and type. Neurology, 1984;34:
14 ILAE defined drug-resistant epilepsy, with 2 hierarchical levels. Level 1 Assessment of adequate trial of AED for efficacy in treating seizures Level 2 drug-resistant epilepsy as a failure of adequate trials of two (or more) tolerated, appropriately chosen, and appropriately used antiepileptic drug regimens to achieve freedom from seizures. if complete seizure control is not achieved with trials of two appropriate antiepileptic drugs, the likelihood of success with subsequent regimens is much reduced while drug resistance may remit over time (at a rate of 4% per year among adults and a higher rate among children), seizure relapse is common, suggesting a fluctuating course. Kwan P, Schachter SC, Brodie MJ. Drug-resistant epilepsy. N Engl J Med 2011;365:
15 Measuring seizure severity EEG MRI Clinical and electrographic seizure monitoring Better EEG techniques to measure seizure severity Structural lesions as a measure of seizure severity Progression of structural lesions in chronic epilepsy Longitudinal studies are necessary to better measure seizure severity
16 Prevalence of interictal epilepiform discharges in epileptic patients Initial EEG demonstrates an epileptiform discharge in 29-55% of patients Serial EEGs performed over time capture epileptiform discharges in 80-90% of patients Repeat studies, with sleep deprivation and more extended recording times, help increase the chances of recording epileptiform discharges in patients with epilepsy Walczak TS, Jayakar P. Interictal EEG. In: Engel J, Jr., Pedley TA, eds. Epilepsy: A comprehensive text. Philadelphia: Lippencott- Raven, 1997:
17 Dry electrode EEG system Low power, ultra-high input impedence EEG recording system Similar performance to wet electrode recordings Advantages of ease of application of electrodes, minimal scalp preparation, and portability Gargiulo G, et al. A new EEG recording system for passive dry electrodes. Clin Neurophysiol 2010;121:
18 Dry Electrode Salvo P, Raedt R, Carrette E, Schaubroeck D, Vanfleteren J, Cardon L. A 3D printed dry electrode for ECG/EEG recording. Sensors and Actuators A: Physical 2012;174:
19 Dry Electrode EEG system Slater JD et. al. J Neurosci Methods 2012;208:134-7.
20 Dry Electrode EEG system Wireless transmission of data opens the possibility of acute and longer-term/prn monitoring of EEG data Home monitoring of EEG Recording of infrequent seizures Status epilepticus Monitoring of EEG data in the emergency medical setting to guide initiation and monitoring of treatment Slater JD et. al. J Neurosci Methods 2012;208:134-7.
21 Measuring disease burden: Clinical seizure counts EMU-based studies show most patients vastly underestimate seizures (patients typically remember about 50% of seizures) Left hemispheric onset seizures are associated with greater loss of awareness of seizures Clinical seizure counts are overall a suboptimal measure of seizure severity Blum DE et al. Neurology 1996;47: Kerling F et al. Epilepsy Behav 2006;9:281-5.
22 Awareness of seizures in the EMU Questioning every evening about awareness of seizures during the previous 24 hours. Patients assessed according to TLE or ETLE seizures (comparison of TLE and ETLE found no significant difference in self-reporting of events) Right TLE aware of 31/43 seizrues (72.1%), left TLE aware of 17/50 seizures (34%) (P < 0.001) Kerling F, Mueller S, Pauli E, Stefan H. When do patients forget their seizures? An electroclinical study. Epilepsy Behav 2006;9:281-5.
23 Awareness of TLE seizures Kerling F, Mueller S, Pauli E, Stefan H. When do patients forget their seizures? An electroclinical study. Epilepsy Behav 2006;9:281-5.
24 Seizure counts in clinical research and practice Patient reported outcomes have implications in research and care for patients Method of acquisition of information influences findings Paper seizure diary On-line electronic diary Linking to other sources of information (i.e. biosensors) Fisher RS, et al. Seizure diaries for clinical research and practice: limitations and future prospects. Epilepsy Behav 2012;24:
25 Long-term intracranial EEG Study showed feasibility of long-term intracranial EEG in ambulatory patients Seizure predictability with sensitivities ranging from 65% to 100% in 11/15 patients, enabling acute treatment Correlation of electrographic and clinical seizures Cook MJ, et. al. The Lancet Neurology 2013;12:
26 Long-term intracranial EEG Components of long-term intracranial EEG system with seizure advisory system Cook MJ, et. al. The Lancet Neurology 2013;12:
27 Long-term intracranial EEG Monthly seizure rates-reported seizures versus clinical seizures captured by intracranial electroencephalography Cook MJ, et. al. The Lancet Neurology 2013;12:
28 Structural brain changes in epilepsy Each fit does some amount of damage to the brain: in the interval the brain recovers itself to a great degree, when a new fit comes on, and new mischief is done; and so the repetition of the paroxysms leaves the brain altered as I have described it. [shrinking of the convolutions, alterations in the color and consistency of the grey and white matter]. Todd RB. The Lumleian Lectures for London Medical Gazette 1849;43:
29 MRI-based hippocampal volume loss and TLE Asymmetry of hippocampal volumes in TLE correlates well with: Lateralization of EEG onset of seizures Post-surgical pathological verification of MTS Good outcome after epilepsy surgery Watson C, Jack CR, Jr., Cendes F. Arch Neurol 1997; 54:
30 Severity of seizures and MRIdetected MTS MRI-detectable MTS in benign TLE (rare or no seizures > 2 years follow-up) 39/100 (38.6%) of patients had MRI evidence of unilateral MTS (based on volume loss and/or signal intensity alteration) MRI-detected mesial temporal sclerosis is often present in patients with sporadic benign temporal lobe epilepsy. Labate A, Ventura P, Gambardella A, Le PE, Colosimo E, Leggio U et al. MRI evidence of mesial temporal sclerosis in sporadic "benign" temporal lobe epilepsy. Neurology 2006;66:562-5.
31 Progressive structural changes in TLE Bernhardt BC, Hong S, Bernasconi A, Bernasconi N. Imaging structural and functional brain networks in temporal lobe epilepsy. Front Hum Neurosci 2013;7:624.
32 Progressive changes in mesial temporal structures Subregional trajectories of progressive hippocampal, entorhinal, and amygdalar atrophy using cross-sectional and longitudinal designs Progressive atrophy in hippocampal CA1, anterolateral entorhinal, and amygdalar laterobasal group bilaterally Convergent longitudinal and cross-sectional patterns of subregional mesiotemporal atrophy emphasize the progressive nature of TLE Bernhardt BC, Kim H, Bernasconi A, Bernasconi N. Subregional mesiotemporal patterns of disease progression in temporal lobe epilepsy. Epilepsia 54 [Suppl. 3],
33 Comparisons of stages of structural changes in AD Jack CR, Jr., et al. Tracking pathophysiological processes in Alzheimer's disease: an updated hypothetical model of dynamic biomarkers. Lancet Neurol 2013;12:
34 Summary Seizure severity varies widely between patients Improved measures of seizure severity will aid in research and treatment Longitudinal studies with EEG and MRI Defining seizure severity and progression will allow for staging of seizures, as in other disease models (i.e. Alzheimer Disease)
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