Evan Fertig Director of Research Director of NEREG Dravet Program Northeast Regional Epilepsy Group What is Dravet? How do we diagnosis it? Dravet Genetics How do we treat it? 1978 C. Dravet describes SMEI 1989 Dravet Syndrome 2001 SCN1A mutation discovered Age 5+ Age 2+ Age 1+ Age 0-1 • Febrile Seizures • EEG normal • Other seizure types appear • EEG abnormal • Cognitive/ Behavior problems develop • Seizures may become less frequent • Cognitive problems plateau Focal Generalized Simple and Complex Myoclonic Partial seizures Autonomic changes are prominent Hemiclonic Seizures Generalized Tonic Clonic Myoclonic Absence Seizures Triggered by flashing lights Can be prolonged Atonic SUDEP Ortho Behavior and Development Autism/ASD ↓Sweating ↑ Infections Nutrition Sleep Get a History! EEG and MRI Genetic Testing positive in 7080% of cases • Mutation in SCN1a gene 1953 1856 http://www.csiro.au Genome Chromosome A Mutation is a SPELLING ERROR here Cell Gene Protein Mutation Neuron Nih.gov http://www.niaaa.nih.gov/NR/rdonlyres/9E5D5B9F-C28E-49F2-A925-33886A82E4D5/0/synapsebetween_neurons.gif Ion Channel Sodium Channel: Excites! Potassium, Choride Channel: Rests! Febrile Seizures (FS) ICE-GTC SCN1A SMEI/Dr avet Syndrom e GEFS+ PT/OT Developmental Specialist Orthopediatist Nutritonist Neurologist Seizure Freedom Development Safety • Antipyrexics • Rescue Medication (benz0) • Cooling vest for hot weather • Avoid big change in temp • Sunglasses: Zeiss Z1F133. • Unilateral eye patching? Wrong Meds • Tegretol, Dilantin • Lamictal, Rufinamide Depakote *Broad spectrum *Behavior *Not typically used under age 2 *Side effects Clobazam Topamax *Broad Spectrum *Broad Spectrum Side Effects • Sedation • Drooling Cognitive Side Effects 2 Sz free 16 continued 10 75-99% decrease 4 50-74% decrease 24 pt 8 stopped 5 not effective 3 vomiting Carabolla 2005 Only med with placebo controlled evidence Evidence of efficacy from 2 short-term and 1 long-term European studies Prescribed with Clobazam (onfi) +/- VPA (depakote) Not FDA Approved Orphan Drug Status Medicaid Covered in some States Blocks Clobazam “Metabolism” • Increases level of medication and important “metabolite” in blood Enhances “GABA” • SCN1A thought to effect GABA brain cells 71 % vs. 5 %; Responders Almost half of the stiripentol recipients were seizure free during this period compared with none in the placebo group. 21 patients on stiripentol had moderate side-effects (drowsiness, loss of appetite) compared with eight on placebo, but side-effects disappeared when the dose of comedication was decreased in 12 of the 21 cases. Drug interactions Clobazam Depakote Neutropenia Comes in 250 mg or 500 mg capsule, or sachet Taken twice or three times a day Lower Clobazam by 20% before dosing No need to change depakote dose Keppra Zonegran Bromides VNS Felbamate Steroids? IVIG? NOT effective: Resective Epilepsy Surgery “Convulsive Seizures” Myoclonic Absence • • • • Depakote Clobazam Stiripentol and Clobazam Topamax • Ketogenic Diet • Ethosuximide No Magic Bullet for treatment Intense Research Efforts are Ongoing Dravet.org