esett established status epilepticus treatment trial (esett) a multicenter, randomized, blinded,...
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Established Status Epilepticus Treatment Trial (ESETT)
A multicenter, randomized, blinded, comparative effectiveness study of fosphenytoin, valproic acid, or levetiracetam in the emergency department treatment of patients with benzodiazepine-refractory status epilepticus.
ESETT
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Project Teams, NETT & PECARN
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Project Teams• Investigators (listed on protocol page): Jaideep Kapur (Uva),
James Chamberlain (Children’s National), Jordan Elm (MUSC), Robert Silbergleit (UMICH)
• Project manager: Amy Fansler (Uva)• Site management: Erin Bengelink and Arthi Ramakrishnan
(UMICH)• PECARN contact: Kate Shreve• Human Subjects Protect Coordinator: Deneil Harney (UMICH)• Site Education: Joy Pinkerton (UMICH)• Data management: Cassidy Conner, Catherine Dillon (MUSC)• Financial: Emily Gray (Uva), Valerie Stevenson (UMICH)• Project Monitors: TBD (UMICH)• NETT and PECARN sites
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Geography
NETT Hubs PECARN Sites
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Rationale
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Status Epilepticus: Epidemiology
Status epilepticus: a prolonged self-sustaining seizure or recurrent seizures without recovery of consciousness. Incidence 41-61/100,000.Episodes of status epilepticus in US in 2010: 120,000-188,459.Mortality in patients with status epilepticus to 17%. Mortality correlates with cause & duration of SE.
DeLorenzo et al. Neurology 1996 Towne et al. J. Clin. Neurophysiology 1994
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Effects of Fever Associated Status Epilepticus in Children: FEBSTAT
1) 11% incidence of Hippocampal injury (T2 signal increase) compared to 0% in control (febrile seizures). 2) Hippocampal T2 hyperintensity after FSE represents acute injury often evolving to a radiological appearance of HS after 1 year.
Shinnar et al. Neurology 2012Lewis et al. Annals of Neurology 2014
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Benzodiazepines: Initial Treatment
PHTSE
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Convusions stopped Ongoing0
20
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60LorazepamDiazepamPlacebo
IM midazolam vs IV lorazepam
Lorazepam vs diazepam for pediatric status epilepticus
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Need for Trial
• There is no well-controlled prospective clinical trial to guide the treatment of SE in patients who fail benzodiazepines.
• SE not responding to benzodiazepines is called Established Status Epilepticus (ESE).
• Episodes of SE in US in 2010: 41- 61/100,000 X 309 million = 120,000-188459
• 35-45 % of patients with convulsive SE do not respond to benzodiazepines i.e.42-72,000 ESE patient.
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Therapy of Established SE: Real world choicesProperty/AED Fosphenytoin Levetiracetam Valproic Acid
Popularity of use in the US
Most commonly used (60-65%)
Used often (20-30) Least often
Ease of administration
Slow Fast Fast
Speed of action Slow administration Enters brainSlowly, acts slowly
Yes
Action last long Yes Yes Yes
Efficacious in animal models
Least effective In combination with diazepam
Very effective
Terminates seizures Partial seizures Partial and generalized
Partial and generalized
Safe Hypotension, cardiac arrhythmia.
safe Safe for acute use
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EFIC• Justification:
• Convulsive status epilepticus is a life threatening disease• Best available treatment is unproven• Clinical trials are needed• Obtaining prospective informed consent is not feasible
• Subject altered (actively seizing and unconscious)• An acute seizing patient cannot be identified prospectively• LAR is often not available in the short time frame required. Even when an
LAR is available, meaningful informed consent is impossible to obtain because of the time constraints and the emotional distress caused by witnessing convulsive SE.
• Subjects may benefit from the research• Research could not be carried out without EFIC • Therapeutic window too short
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Inclusion CriteriaInclusion criteria Measure Patient witnessed to have a seizure in the past 5-30 minutes.
Time of first seizure is when EMS personnel were called if eyewitness account available or first seizure witnessed by EMS personnel.
Patient received adequate dose of benzodiazepines in the past 5-30 minutes.
The doses may be divided. Time is counted from the last dose.
EMS or ED record of treatment:
For those > 40 kg--diazepam 10 mg IV or rectal, lorazepam 4 mg, IV, or midazolam 10 mg IM or IV.
For those 10-40 Kg adequate doses are: diazepam 0.3 mg/kg IV or rectal, lorazepam 0.1 mg/kg IV or midazolam 0.3 mg/kg IM or 0.2 mg/Kg IV
Continueded seizure in the Emergency Department
Clinical observation
Age more than 2 years Caretakers report the age or clinical observation
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Patient EnrollmentOpen study box remove study drug
Estimate weight: Use Broselow like tape if necessary
Wt. (kg) Vol. 7.5 910 1212.5 1515 1820 2425 3030 3635 4240 4850 6060 7270 8475 90>75 90
Dial appropriate volume in the infusion pump. Press start
Connect to patient IV catheter
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InterventionDrug Dose Comments Supporting
References
FOS 20 mg /kg (PE) with maximum 1500 mg
Viewed as standard dose.
PDR: Package insert
LEV 60 mg/kg with max 4500 mg
Highest approved dose for children, Published reports suggest safety of 4500 mg.
VPA 40 mg/kg with max 3,000 mg
Doses ranging between 15-45 mg/kg have been reported.
Limdi, et al (2007)
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Primary Outcome
Clinical cessation of status epilepticus, determined by the absence of clinically apparent seizures and improving responsiveness, at 60 minutes after the start of study drug infusion, without the use of additional anti-seizure medication.
(*Note if patient is intubated within 60 minutes of enrollment, it is failure to meet primary outcome, because sedatives are used)
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Primary Outcome (T0 + 60 min)
To +10 min 9:51:00
Yes NOThere has been no clinical seizure since 20 minutes after the start of study drug infusion
Responsiveness has improved
No anti-seizure medications used since start of study drug infusion, (includes sedatives for intubation)
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Recording Prospective Data: Primary & Back up
Primary record Back up data recording device
Paper record produced by the clinical coordinatorBased on review of the chart, interviews with clinical care team. However…coordinator could be late, team busy, shifts may change and there is potential for lost data
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TO+20 MIN
To +20 min 10:00:14
Clinical seizure absent?
YesNo Consider
PhenobarbitalAnesthesiaSecond line agent
Responds to verbal command
YesNO
VPA
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Why wait for 20 minutes for seizures to end: drug entry is slow
Levetiracetam Fosphenytoin
Blood
Brain
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Safety Outcomes at T0 +60• Life-threatening hypotension: Within 1 hour of start of
infusion of the study drug, systolic blood pressure remains below specified levels on two consecutive readings at least 10 minutes apart and remains below specified levels for more than 10 minutes despite reduced drug infusion rate or its termination and a fluid challenge. • “Specified levels” for systolic blood pressure are 90 mmHg in adults and
children older than 13 years old, 80 mmHg in children 7 to 12 years old, and 70 mmHg in children 2 to 6 years of age.
• Life-threatening cardiac arrhythmia: Any arrhythmia that occurs within 1 hour of start of infusion of the drug that persists despite reducing rate of drug infusion, or that requires termination with chest compressions, pacing, defibrillation, or use of an anti-arrhythmic agent or procedure.
ESETT
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Primary outcomeESETT
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Safety outcome at To +60
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Secondary Outcomes
oOccurrence of life threatening Hypotension or cardiac arrhythmia,
oRichmond agitation and sedation score at primary outcome determination
oTime to termination of seizures oIntubation, oAdmission to ICU oSeizure recurrence oLength of stay in the ICU and hospital,oMortality
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Study Design
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Primary Objective• To determine the most effective and/or the least
effective treatment of benzodiazepine-refractory status epilepticus (SE) among patients older than 2 years.
• Three active treatment arms: • fosphenytoin (FOS)• levetiracetam (LEV)• valproic acid (VPA)
ESETT
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Primary Outcome
Clinical cessation of status epilepticus, determined by the absence of clinically apparent seizures and improving responsiveness, at 60 minutes after the start of study drug infusion, without the use of additional anti-seizure medication.
ESETT
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Study Design
• Bayesian Adaptive Design (extensive simulation study)
• Maximum sample size is N=795 total.
• Primary endpoint at 60 minutes
• Followed until discharge/30 days
• Randomization will be stratified by three age groups
• 2-18 years
• 19-65 years
• 66 years and older
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Bayesian Adaptive Design Features• Adaptively allocate to favor better treatments
• Drop poor performing arms• Relative to one another • Relative to 25% goal
• Stop early if we know the answer or know we won’t know• Efficacy stop if treatment clearly better• Futility stop if unlikely to ID a ‘best’ or ‘worst’
• Do not stop if 1 worse and other 2 equally good• Futility stopping if all arms bad
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Adaptive Allocation• Randomize N=300 patients equally
• At N=300 begin adaptive allocation • Update allocation probability after every 100 subjects (N = 300, 400,
… , 700 )
• Adaptive allocations after every 100 subjects equates to approx. every 6 months given expected accrual
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Early Stopping• Begins after 400 patients
• Evaluated after every additional 100 patients accrued to coincide with adaptive allocation assessments (i.e. N= 400, 500, 600, 700) for early success stopping and early futility stopping.
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Study Logistics
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Recruitment Goals
• Milestones • 2 patients by Sept 2015• 10 by December 2015
• Target is 795 subjects enrolled over 4 years
• Target recruitment (16.6 subjects/month) is linear although staggered start-up.
ESETT
9/1/2015 9/1/2016 9/1/2017 9/1/2018 9/1/20190
100
200
300
400
500
600
700
800
900
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ESETT 2 Year Timeline
2014
Oct Dec
2015
Feb Apr Jun Aug Oct Dec
2016
Feb Apr Jun Aug 2016
100 patients enrolled
9/30/20162 patients enrolled9/30/2015
EFIC activities complete at 2 sites
9/1/2015
IRB review complete 2 sites & Enrollment commences9/1/2015
IND review complete and study cleared
4/30/2015
Drug testing complete
2/15/2015
Operationalize phenomenology core
4/1/2015 - 9/1/2015
Subcontracts executed
10/1/2014 - 12/31/2015
Site prep incl investigator mtg
9/1/2015 - 2/15/2016
App Development
4/1/2015 - 8/1/2015
IRB review 4/1/2015 - 8/12/2016
EFIC activities
4/1/2015 - 8/1/2016
IND review
3/1/2015 - 4/1/2015
Drug testing 11/15/2014 - 2/15/2015
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Analysis Plan
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Statistical Analysis• Intent-to-Treat sample
• All subjects who are randomized**, except re-enrollers
• Minimal missing data (imputed as treatment failure)
• Primary Analysis is Bayesian/non-informative prior
• Trial success defined as• Posterior probability that a treatment is the most effective > 0.975 or the • Posterior probability that a treatment is the least effective is > 0.975
**Defined as when the infusion pump is connected to study drug vial and the patient’s IV catheter is switched on
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Planned Interim Analyses• Interim analyses are planned after 400, 500, 600 and 700
patients are enrolled.
• At each interim analysis, the trial may stop early for success or futility.
• Estimate that the first planned analysis will occur after the first 24 months of enrollment.
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Secondary Analysis at End of Trial• Secondary analysis of primary outcome:
• Per protocol• Re-enroller analysis• An analysis by age group
• Secondary outcomes:• time to termination of seizures• admission to ICU• length of ICU and hospital stays
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Safety Outcomes• Life-threatening hypotension• Life-threatening cardiac arrhythmia• Mortality• Need for endotracheal intubation• Acute recurrent seizure• Acute anaphylaxis• Respiratory depression• Hepatic transaminase or ammonia elevations• Purple glove syndrome
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SAE Reporting• Site enters SAE in WebDCU (within 24 hours of knowledge of
the event) which triggers automated notification for internal review• Administrative review by CCC Project Site Manager (SM)• Clinical content review by Internal Quality and Safety Reviewer (IQSR)
• Upon approval, automated notification triggers for review by external safety monitor
• External Safety Monitor (ESM)• Designates whether event is serious, unexpected, unanticipated and
related to study drug• If criteria for expedited reporting are met, clinical site will complete
MedWatch form and sponsor will submit
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Information & Resources
• ESETT Home Page: www.esett.org • ESETT Toolbox is available within www.esett.org • NETT home page www.nett.umich.edu• PECARN home page http://www.pecarn.org/• WebDCU https://webdcu.musc.edu/• New team member information and training
http://nett/nett/new_team_member_information
ESETT