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Oral high-dose phenobarbital therapy for early infantile epileptic encephalopathy
Hiroshi Ozawa1, Yuko Kawada, Seiji Noma
1Department of Pediatrics, Tokyo Metropolitan Hachioji Children's Hospital, Hachioji, Tokyo, Japan.
Insights
High-dose phenobarbital effectively treated a patient with Ohtahara syndrome, significantly reducing seizures and epileptic discharges. This therapy is a promising option for early infantile epileptic encephalopathy with suppression bursts.
Area of Science:
- Neurology
- Pediatric Neurology
- Epileptology
Background:
- Early infantile epileptic encephalopathy with suppression bursts (Ohtahara syndrome) is a severe, rare epilepsy syndrome.
- Treatment options for Ohtahara syndrome are limited, with variable responses to conventional antiepileptic drugs.
Observation:
- A 1-month-old infant presented with frequent tonic spasms characteristic of Ohtahara syndrome.
- Initial treatments including intravenous midazolam and various oral antiepileptic drugs showed minimal efficacy.
Findings:
- Oral high-dose phenobarbital therapy (15 mg/kg/day) dramatically reduced seizure frequency from approximately 300 to 5-10 per day.
- Electroencephalogram showed a significant decrease in epileptic discharges with therapeutic serum phenobarbital levels (60-100 mg/dL).
Implications:
- High-dose phenobarbital is a viable and effective treatment strategy for Ohtahara syndrome.
- This approach warrants consideration in managing early infantile epileptic encephalopathy with suppression bursts.
- Further research into optimal dosing and long-term outcomes of high-dose phenobarbital in Ohtahara syndrome is recommended.
Abstract:
We report oral high-dose phenobarbital therapy for a patient with early infantile epileptic encephalopathy with suppression bursts (Ohtahara syndrome). At 1 month of age, many series of tonic spasms, with raising limbs and crying lasting for a few minutes, developed and increased up to approximately 300 times per day. Initially intravenous midazolam (0.5 mg/kg/hour) slightly decreased the seizures, although oral vitamin B6, valproic acid, clonazepam, and zonisamide had little effect. Oral high-dose phenobarbital therapy was begun at a dosage of 15 mg/kg/day, and the seizures markedly decreased to 5-10 times per day and the epileptic discharges on electroencephalogram greatly decreased. Serum phenobarbital levels ranged between 60 and 100 mg/dL. High-dose phenobarbital therapy should be considered for the treatment of early infantile epileptic encephalopathy with suppression bursts.