4.5 Article

A combination of ketamine and diazepam synergistically controls refractory status epilepticus induced by cholinergic stimulation

Journal

EPILEPSIA
Volume 49, Issue 2, Pages 248-255

Publisher

WILEY
DOI: 10.1111/j.1528-1167.2007.01384.x

Keywords

status epilepticus; NMDA receptor; ketamine; diazepam

Funding

  1. NINDS NIH HHS [R01 NS40337, R01 NS044370-04, R01 NS040337-05, R01 NS040337, R01 NS044370, U01 NS58204, U01 NS058204-02, U01 NS058204] Funding Source: Medline

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Purpose: New treatments are needed for status epilepticus (SE) that is refractory to drugs modulating GABA(A) receptors, and NMDA receptor antagonists are candidate drugs. Methods: Clinically available NMDA receptor antagonist ketamine was tested for effectiveness in terminating prolonged SE induced by a combination of lithium and pilocarpine. Animals were treated 10 min after first grade 5 behavioral seizure (Racine scoring scale) by intraperitoneal administration of ketamine, diazepam, or saline. Seizure termination was determined by electroencephalogram (EEG) recordings from the hippocampus and the cortex. Results: Animals treated with normal saline or either 20 mg/kg diazepam, or 50 mg/kg ketamine continued in SE for the next 300 min. However, combined treatment with diazepam and ketamine rapidly terminated prolonged cholinergic stimulation-induced SE. Detailed study of dose response relationships demonstrated that diazepam enhanced efficacy and potency of ketamine in terminating SE. Discussion: This study demonstrated synergistic action of diazepam and ketamine in terminating SE. It suggests that a ketamine-diazepam combination might be a clinically useful therapeutic option for the treatment of refractory SE.

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