Combined Ketamine and Midazolam for Generalized Convulsive Status Epilepticus (Ket-Mid)

  • STATUS
    Recruiting
  • End date
    Apr 2, 2024
  • participants needed
    144
  • sponsor
    Sohag University
Updated on 6 April 2023

Summary

Generalized convulsive status epilepticus (GCSE) is a common neurological emergency in children. Benzodiazepines are the recommended first line antiseizure medication (ASMs), but they fail to control seizures in a third of cases. Combination of benzodiazepines with another ASM that has a different mechanism of action may be a promising option for faster control of GCSE. In this study, the investigators aim to evaluate the efficacy and safety of ketamine plus midazolam versus midazolam alone as first-line therapy of pediatric GCSE.

Description

Generalized convulsive status epilepticus (GCSE) is a common neurological emergency in children, which is associated with significant morbidity and mortality. This condition is defined as > 5 minutes of continuous or recurrent generalized tonic-clonic seizure activity without regaining consciousness. GCSE requires immediate evaluation and management in order to control ongoing seizures.

According to most guidelines, benzodiazepines are the recommended first line antiseizure medication (ASMs). Second-line ASMs for benzodiazepines-refractory GCSE include multiple options, such as fosphenytoin/phenytoin, valproic acid, or levetiracetam. Last, refractory GCSE requires treatment with third-line ASMs, such as another second-line ASMs or infusion with thiopental, midazolam, pentobarbital, propofol, or ketamine.

However, about 35% of cases with GCSE are not controlled by benzodiazepines, and up to 40% of benzodiazepines-refractory GCSE don't respond to second-line ASMs. As GCSE persists for a longer time, it becomes more difficult to control with worse prognosis. Indeed, the effectiveness of benzodiazepines to control seizures decreases by 50% when given after 10-15 minutes of continuous seizures. Therefore, new ASMs or combinations are required for earlier control of seizures, which will contribute to better outcome. Combination of benzodiazepines with another ASM that has a different mechanism of action may be a promising option for faster control of GCSE. One of the potential drugs for such combination is ketamine.

Several adult and pediatric studies have shown effectiveness of ketamine in refractory and super-refractory GCSE. Unlike benzodiazepines that act through inhibitory Gamma-aminobutyric acid (GABA), ketamine is a non-competitive antagonist for N- methyl- d- aspartate (NMDA) receptors, which mediates excitatory glutamate action. Continuous seizure activity is associated with internalization of GABA receptors and upregulation of NMDA receptors.

A number of animal studies have demonstrated synergistic action of combined ketamine and benzodiazepines for status epilepticus. While combined ketamine and benzodiazepines have been used in pediatric sedation/analgesia, there are limited studies on such combination for children with GCSE.

In this study, the investigators aim to evaluate the efficacy and safety of ketamine plus midazolam versus midazolam alone as first-line therapy of pediatric GCSE.

Details
Condition Generalized Convulsive Status Epilepticus
Treatment Ketamine, Placebo, Midazolam
Clinical Study IdentifierNCT05779657
SponsorSohag University
Last Modified on6 April 2023

Eligibility

Yes No Not Sure

Inclusion Criteria

Age from 6 month to 16 years
Generalized convulsive status epilepticus, defined as > 5 minutes of clinically observed continuous or recurrent generalized, tonic-clonic seizure activity without regaining of consciousness

Exclusion Criteria

Failure to obtain informed consent
Previous treatment with any antiseizure medication for the presenting seizure episode
Hypertension
Alcohol intake
Conditions associated with increased intracranial pressure (e.g., central nervous system mass lesions, hydrocephalus)
Glaucoma
Known allergy or contraindications to any of the study drugs
End-stage kidney disease
End stage liver disease
Arrhythmia, severe heart disease, or pulmonary hypertension
Hyperthyroidism
Pheochromocytoma
Hypoglycemia or hyperglycemia
Inborn errors of metabolism
Known or suspected psychiatric disorder
Failure to obtain intravenous access in the first 5 minutes of stabilization phase
Cessation of seizures during the stabilization phase (0 - 5 minutes)
Traumatic brain injury
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