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Effective treatments of prolonged status epilepticus in developing rats
Henry Hasson1, Mimi Kim, Solomon L Moshé
1Saul R. Korey Department of Neurology and Department of Pediatrics, Albert Einstein College of Medicine of Yeshiva University, Bronx, NY, USA. henry@hassonmd.com
Insights
Diazepam (DZP) and pentobarbital (PTB) effectively controlled prolonged status epilepticus (SE) in developing rats by P15 and P21. Higher doses were needed for efficacy, and effectiveness was age-dependent.
Area of Science:
- Neuroscience
- Pharmacology
- Developmental Biology
Background:
- Status epilepticus (SE) is a neurological emergency.
- Developing brains may have different responses to anti-seizure medications.
- Understanding age-dependent drug efficacy is crucial for treatment.
Purpose of the Study:
- To determine the efficacy of diazepam (DZP) and pentobarbital (PTB) in controlling prolonged SE in developing rats.
- To investigate the age-dependent effects of these drugs on SE control.
- To compare the efficacy of DZP and PTB in different SE models.
Main Methods:
- Induction of one-hour-long SE using kainic acid or lithium pilocarpine in rats at postnatal days 9, 15, and 21.
- Treatment with varying doses of DZP (20-60 mg/kg) or PTB (20-60 mg/kg).
- Assessment of behavioral and electrographic seizure activity to determine SE cessation.
Main Results:
- Neither DZP nor PTB effectively stopped SE at postnatal day 9; higher doses led to high mortality.
- Both DZP and PTB demonstrated dose-dependent efficacy in stopping SE at postnatal days 15 and 21.
- DZP showed faster SE cessation compared to PTB, and a combination therapy (low-dose PTB after ineffective DZP) was highly effective.
Conclusions:
- High doses of DZP and PTB are required to control prolonged SE in developing rats.
- The effectiveness of DZP and PTB in controlling SE is significantly dependent on the age of the developing rat.
- Age-dependent efficacy suggests critical developmental windows for anti-epileptic drug treatment in SE.
Abstract:
We determined the efficacy of diazepam (DZP) and pentobarbital (PTB) in controlling prolonged status epilepticus (SE) in developing rats. One-hour-long SE was induced with kainic acid (KA) or lithium pilocarpine (Li-Pilo) in Postnatal Day 9 (P9), 15 (P15) and 21 (P21) rats, which were then treated with varying doses of DZP (20-60 mg/kg) or PTB (20-60 mg/kg). At P9, neither drug stopped SE, and higher doses could not be used because of high mortality. At P15 and P21, DZP and PTB stopped both behavioral and electrographic SE in a dose-dependent fashion, with similar efficacy in the two seizure models. DZP stopped SE significantly faster than PTB. Administration of a low dose of PTB (20mg/kg) following an initially ineffective treatment with DZP 20mg/kg stopped SE in all rats. The data suggest that high doses of DZP and PTB are needed to stop prolonged SE in developing rats, but their effectiveness is age dependent.
