Status Epilepticus (SE): Rx Following Benzodiazepine Use Edward Sloan, MD, MPH Associate Professor Department of Emergency Medicine University of Illinois.

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Presentation transcript:

Status Epilepticus (SE): Rx Following Benzodiazepine Use Edward Sloan, MD, MPH Associate Professor Department of Emergency Medicine University of Illinois College of Medicine Chicago, IL

Edward Sloan, MD, MPH Global Objectives Improve care of the patient with SE Minimize morbidity and mortality Expedite disposition Optimize resource utilization Enhance our job satisfaction Maximize Rx options, success

Edward Sloan, MD, MPH Sessions Objectives Review seizure and SE epidemiology Address non-response to benzos Examine role of Rxs after benzos –IV phenytoins –IV phenobarbital –IV valproate –IV propofol Provide conclusions regarding Rx

Edward Sloan, MD, MPH Seizure Epidemiology 2.5 million people with epilepsy 6.6 per 100,000 28% visit an ED annually 150,000 new onset seizures per year 1-2% of all ED visits for seizures 2 millions ED visits per year

Edward Sloan, MD, MPH Status Epilepticus Epidemiology 50, ,000 Cases annually 50 Cases per 100,000 population Infants and elderly: greatest risk Etiol: acute insult, epilepsy, new onset sz Mortality 5-22%, 65% with refractory SE 7% of ED seizure patients in SE ED physicians: 5 SE cases per year

Edward Sloan, MD, MPH Seizure Rx with Benzodiazepines What percent of ED seizure patients will not respond to initial treatment with benzodiazepines? How many patients will not respond to initial EMS or ED Rx?

Edward Sloan, MD, MPH Status Epilepticus Mechanism Abnormal discharge by a few unstable neurons Propagation by recruitment of normal neurons Failure of normal inhibitory neurotransmitters (GABA) Enhancement of excitatory neurotransmitters –(glutamate, aspartate, acetylcholine) Interference with normal metabolic processes –glucose, 02 metabolism –Na+, Ca++, K+, Cl- ion shifts

Edward Sloan, MD, MPH SE Duration and Mortality SE >60 min: 10-fold greater 30-day mortality (32% vs 2.7%) Worse outcome associated with –Longer duration SE –SE refractory to first-line therapy

Edward Sloan, MD, MPH Szs Refractory to Benzos: ED Exp Huff: Prospective ED seizure study − 17% of sz patients: repeat seizure − 6% of sz pts: Dx with SE EMS seizure patients − 7% found to be actively seizing − 1% actively seizing at ED arrival

Edward Sloan, MD, MPH Szs Refractory to Benzos: ED Exp Pre-hospital Trial of SE (PHTSE) − SE population − 41-79% active sz upon ED arrival ED pediatric seizure patients − 5-7% of pts will seize in the ED − Independent of febrile, afebrile etiol

Edward Sloan, MD, MPH Conclusion: Sz at ED Arrival, in ED 1-2% Active seizing at ED arrival 41-79% Active seizing in EMS SE 5-17% of ED pts will repeat seize 6% of sz pts will be Dx’d with SE

Edward Sloan, MD, MPH Szs Refractory to Benzos: Trials Prospective, randomized clinical trials Leppik, 1983: Benzos seizure control − 89% control with lorazepam (no stat diff) − 76% control with diazepam Treiman, 1998: VA SE study − 67% control with lorazepam (no stat diff) − 60% control with diazepam, phenytoin

Edward Sloan, MD, MPH Szs Refractory to Benzos: Trials Alldredge, 2001: PHTSE − 59% control with lorazepam ** − 43% control with diazepam * − 21% sz termination in placebo group Treiman, 1990: Benzo overview − 79% control with benzos − Based on review of 1,346 study patients

Edward Sloan, MD, MPH Conclusion: Sz Control with Benzos 59-89% Sz control with lorazepam 43-76% Sz control with diazepam Lorazepam superiority suggested

Edward Sloan, MD, MPH Seizure Rx after Benzodiazepines What is the role of the following second line Rx in SE patients? − Phenytoins − Phenobarbital − Valproate − Propofol

Edward Sloan, MD, MPH Status Epilepticus Definition Needed for epidemiologic and clinical trials Historical definitions –Two seizures within 30 min, no a lucid interval –One seizure >30 min duration More recent definitions more aggressive –Two seizures over any interval, no lucid interval –One seizure of >10 min duration

Edward Sloan, MD, MPH Seizure Rx after Benzodiazepines What is the role of the following second line Rx in SE patients? − Phenytoins

Edward Sloan, MD, MPH Post- Benzos Sz Control: Phenytoins IV phenytoin IV fos-phenytoin High-dose phenytoins

Edward Sloan, MD, MPH Post- Benzos Sz Control: Phenytoin Few trials of phenytoin in SE Treiman1998: VA SE study – 56% success: diazepam, phenytoin – 20 min endpoint, EEG termination – Difference with fos-phenytoin?

Edward Sloan, MD, MPH Post- Benzos Sz Control: Fos-phenytoin Abstract: Fos-phenytoin in SE Most rcv’d benzos, SE terminated 97% remained sz-free for 2 hours No prospective studies in active SE Rates up to 150 mg/min shown

Edward Sloan, MD, MPH Post- Benzos Rx: High-dose Phenytoins Osorio, 1989: 13 SE patients – Mean dose 24 mg/kg – 38% did not require phenobarbital – 62% success rate Epilepsy Foundation of America, 1993 – Working group recommendations – Use up to 30/mg/kg prior to other Rx

Edward Sloan, MD, MPH Seizure Rx after Benzodiazepines What is the role of the following second line Rx in SE patients? − Phenobarbital

Edward Sloan, MD, MPH Post- Benzos Sz Control: Phenobarbital Accepted Rx, 2 non-blinded studies Shaner, 1988: DZ/PHT, PB/prn PHT – SE duration shorter with PB – 61% of PB pts required no PHT Painter, 1999: Neonatal seziures – Compared PB, PHT for active sz – PB 57%, PHT 62% as monotherapies

Edward Sloan, MD, MPH Seizure Rx after Benzodiazepines What is the role of the following second line Rx in SE patients? − Valproate

Edward Sloan, MD, MPH Post- Benzos Sz Control: Valproate Giroud, 1993: French SE series – 83% success in terminating SE – Other drugs were provided prior Other series have shown efficacy Rates up to 300 mg/min shown

Edward Sloan, MD, MPH Seizure Rx after Benzodiazepines What is the role of the following second line Rx in SE patients? − Propofol

Edward Sloan, MD, MPH Post- Benzos Sz Control: Propofol Stecker, 1998: propofol vs. barbs – Fewer SE pts controlled (63 vs. 82%) – Control time shorter (3 vs. 123 min) Other series have shown efficacy Provides burst suppression Must be D/C’d slowly

Edward Sloan, MD, MPH Conclusion: Seizure Rx After Benzos Limited studies support Rxs Phenobarbital studies: best data Current recommendations: – Benzos, phenytoins, phenobarbital – Valproate, propofol also useful

Edward Sloan, MD, MPH Conclusion: Seizure Rx After Benzos Rapid infusion: fos-phenytoin, valproate Limited supply of phenobarbital IV valproate: limited sedation Propofol: burst suppression

Edward Sloan, MD, MPH Conclusions: SE and its Therapies Refractory to benzodiazepines: SE Rare, but significant M & M Many therapies can be used Varied risks and benefits of each Rx

Edward Sloan, MD, MPH Recommendations: SE ED Rx Have your drugs available in ED Have a protocol with times Rapidly go thru drugs in protocol Provide full mg/kg doses Use all of these drugs in min

Edward Sloan, MD, MPH SE Protocol: An Example min: Initial Rx, benzos min: Phenytoins min:Phenobarbital min:Valproate min: Propofol

Edward Sloan, MD, MPH SE Recommendations Develop a SE protocol Make all therapies available Make EEG a “stat” test Work with neurologists, NS Optimize SE patient outcome