Status Epilepticus: Clinical Analysis of a Treatment Protocol Based on Midazolam and Phenytoin

Abstract

The efficacy of a combination of midazolam and phenytoin in treating generalized convulsive status epilepticus in children was studied retrospectively. The patient group comprised all patients admitted for generalized convulsive status epilepticus to the pediatric intensive care unit over 7 years. Patients treated according to the protocol were included (N = 122). These patients were treated with the following regimen; each subsequent step was taken if clinical evidence of epileptic activity persisted: midazolam 0.5 mg/kg rectally or 0.1 mg/kg intravenously. After 10 minutes: midazolam 0.1 mg/kg intravenously. After 10 minutes: phenytoin 20 mg/kg intravenously in 20 minutes. After phenytoin load: midazolam 0.2 mg/kg intravenously followed by midazolam 0.1 mg/kg/hour continuously, increased by 0.1 mg/kg/hour every 10 minutes to maximum 1 mg/kg/hour. Phenobarbital 20 mg/kg intravenously or pentobarbital 2 to 5 mg/kg intravenous load, 1 to 2 mg/kg/hour continuously intravenously. Patients who received initial rectal diazepam were included. Patients were categorized according to the cause of generalized convulsive status epilepticus. These categories were then related to the level of antiepileptic therapy needed. Patients' ages ranged from 0.5 to 197.4 months. The cause of generalized convulsive status epilepticus was idiopathic or febrile convulsions in two thirds of cases. Most (89%) patients were managed on midazolam and phenytoin. Generalized convulsive status epilepticus was terminated with midazolam alone in 58 patients, with the addition of phenytoin in 19 patients and with continuous midazolam in 32 patients. Thirteen patients needed additional barbiturates. The relationship between the level of antiepileptic therapy and etiology was not significant. Fifty-two patients needed artificial ventilation. Seven patients died; no deaths were directly attributable to generalized convulsive status epilepticus itself. With the use of the proposed protocol, combining midazolam and phenytoin, 89% of the cases of generalized convulsive status epilepticus could be successfully managed.